View Full Version : General Q & A




  1. Cam Identification Question
  2. hp 500 horse power
  3. Crossover and Thermostat housing for use with Procharger
  4. How much does weight matter?
  5. Anodes for trim & steering rams - Bravo XR / ITS ??
  6. Cmi 496HO header mods
  7. Anybody use the fast ez efi? Or other brand??
  8. Chrome Plating
  9. Carb Selection
  10. Leakdown test procedure info needed
  11. Best Viewing place on shore to watch Boat Races at Key west.
  12. Question for Sonic owners
  13. LS Engine Plumbing
  14. 383 vs BBC in a Baja 220
  15. engine compartment temps
  16. interested in 2014 scarab 30 tournament cc - are they any good?
  17. Merc SC800 supercharger pulley/boost ratio?
  18. Ls..... Engine tear down intervals?
  19. engine dimensions
  20. Outboard motor life and issues
  21. A/C power needs
  22. Fresh (10-20 hrs.) 600 cubic inch motor hours warped all intake valves last season?
  23. speaking of HP estimates, anybody ever dyno stock 330-365-420 and what do they make?
  24. Windshield Replacement
  25. 454 build using peanut ports
  26. horsepower estimate
  27. 300 Verados with 400 hours - any major concerns
  28. A/F Ratio
  29. Merlin Intake on a 454
  30. Templet for 280 K planes
  31. Prop's on a 1990 36 no step 420 power
  32. standard deck to a tall deck
  33. 700 - 750 Hp: Boosted LS vs NA Big Block?
  34. Scarab 29' hull/speed limits?
  35. oil restrictors and pushrod restrictors?
  36. air fuel ratio with boost
  37. Most power out of a 454? PROVEN combos????
  38. Repowering 33 Outlaw with twin 454s: MPI or Carbs?
  39. 700 sci whipple upgrades
  40. Differences between K plane 280 vs 300
  41. Backwards sea pump
  42. 049 oval port heads
  43. Symptom of leaky header
  44. Neutral balance Harmonic balancers? middle of the line?
  45. 502 MAG MPI Cam swap
  46. Still Looking!
  47. Running a boat on the hose in freezing temps?
  48. superchillers
  49. ignition coils
  50. Mercruiser HP425 Gen V Big Block pistons
  51. Did GM sell a 509 block from factory
  52. The trouble with Blowers is:
  53. Stainless exhaust tip flappers ???
  54. What cams will work with stock lifters.
  55. Knock sensors for 502 mag mpi
  56. Another build dyno'd today. Whippled 509.
  57. Compression Ratio
  58. Anyone Been To The Louisville KY Boat Show??
  59. Installing new Camshaft
  60. Nordskog GPS speedometer wiring..
  61. Facebook tech.
  62. 1994 mercury racing hp 465?
  63. 454 cam
  64. The GM/Merc Rectangle port head. Discuss.
  65. morel hyd roller lifters
  66. Pushrods
  67. Who has 575sci TB?? any motor shops??
  68. Big cube n/a combo's
  69. What head should I use
  70. Leaking Trim/Trim Tab Pumps
  71. Engine Guys help (scan tool to use) on 97 454mag mpi's
  72. Diacom software ?? - where to hook up on 525EFI ?
  73. 502's with roller cams have some saltwater spots on them, Replace or run?
  74. 454/502 Mag Camshaft GM # 12551622
  75. 540 Clearances and oil pressure thread...
  76. Identify this raw water pump?
  77. cnc d heads
  78. Piston Mercruiser 496 HO
  79. Machining Fuel Rails
  80. 454 Gen 6 Engine Cam Question
  81. 600SC mechanical fuel pump ability??
  82. Looking to instal a 496 Mag HO where there was a 7.4 MPI
  83. Procharged 502 Mag Oil Cooler Recommendations
  84. Bravo One outdrive
  85. 700hp 540s
  86. 454 rebuild with blower... Pistons and clearances.
  87. Help! - what happened to champion cylinder head co, palm coast, fl?
  88. good rockers for 6000 rpm, 540CI combo??
  89. 525 whipple charged engine weight
  90. Flywheel balancing
  91. Broken xr case repair?
  92. B&M blower identification
  93. noise under valve cover
  94. Need FlyWheels...Internally Balanced
  95. Anyone running Imco powerflow manifolds on ZZ502
  96. TRS Values
  97. any proffestional tile setters looking for work
  98. Prop slip increase with speed.
  99. Oil Pan Swap / Value
  100. Carb vs Fuel Inj?
  101. CMI headers leaking....HELP
  102. anybody with 496 HO using stainless marine exhaust?
  103. Elbow restrictor gasket vs full flow gasket
  104. Would you guys use this?
  105. velvit drive pump
  106. Rubberized spray flooring?
  107. Couple quick questions - piston install
  108. Tuners or Chips?
  109. How many RPM's can the stock 500HP rotating assembly take?
  110. Who is not running 45* valve angle?
  111. In-Control Shifter
  112. Crank to crank measurement / drive centers
  113. Bumpers and ropes???
  114. What oil pan is this???? Gen6 bbc
  115. 87 scarab excel 26 convert to bravo is it worth it?
  116. powerquest 270 laser cockpit
  117. Article about valve angles
  118. New boat soon, 32' BT, 29' Scarab, 31' Scarab, or another Formula??
  119. Piston top displacement stats needed
  120. worth the trouble?? 47 fountain
  121. New carpet for a Cigarette 20
  122. Water preassure in Bravo XR?
  123. Storage of gasoline
  124. conversion i/o to o/b help.... pics... info... anything
  125. Couple quick questions
  126. Grilling go fast
  127. Good mechanic
  128. lightning headers in a 25 Daytona?
  129. Mechanic needed pompano beach area
  130. 502 mag mpi not priming oil??
  131. Turndowns and water reversion?
  132. Fuel Stabilizer or Octane Booster?
  133. Found a 525 short block! What's it worth?
  134. +.300 lifters
  135. Baja 33 Outlaw Parts
  136. Search Tempest - Trojen virus??
  137. The million dollar question
  138. msd
  139. determining oil
  140. EFI 525 rear mounted camshaft sensor???
  141. Merc 700sci hrs/lifespan before rebuild
  142. Roots supercharger intake question
  143. Trouble free 525efi - do they exist?
  144. Different size headers
  145. Blower Application - Fuel Pressure Reg. & Return Valve
  146. 502 Ring Recommendation Please
  147. Good Bad opinion Formula 292 or 312
  148. original motors in a 91 sutphen
  149. Leaking Hatch Rams
  150. Mesa Balancing
  151. HTM oil pressure gauge
  152. Regular or Swept back
  153. Budget 454 Build
  154. 420hp 454
  155. benefits of distributor-less ignition
  156. 454 Repower
  157. 500 efi
  158. Dropping some weight on a HP500 carb?
  159. Any one interested in a boat move New Orleans to Detroit Area
  160. Best Cam Choice - Non-roller 350 with Vortec heads
  161. Steering Wheel rotary circuit switch?
  162. Carb talk
  163. Carb CFM?
  164. Gil Manifold Thoughts
  165. head gasket ?
  166. Going blown have a few questions?
  167. 97 PQ 270 laser wt twin 350 mags to 383 400hp what kinda speed
  168. 350 mag rebuild to 383. oil cooler Question
  169. AN fittings and Stainless braided lines
  170. what's the best clamp on muffler/silencer
  171. Formula 242 drive height.
  172. B&M 250 vs 420 Mega Blower
  173. 2001 Sea Ray 280 SS Engine Question
  174. Low water pickup depth below bottom
  175. Have you seen this exhaust manifold before????
  176. 500HP top end in a 502 MAG
  177. Performance Boating Magazine
  178. 525EFI Valve Springs Concerns
  179. Favorite BBC Rod Thread
  180. Upgrades to Cabin Door and Hatches.
  181. Calling all mechanics
  182. Pulled one of my gimbals and the transom is in great shape! Do I still replace it?
  183. Looking to set up a back-up bullet for the chamber
  184. HP 500 Head and Cam upgrade
  185. Alternates for Bravo drives
  186. 7.4 mpi stock cam specs needed
  187. Can you keep the thermostat and circulating pump on roots type blower motors?
  188. engine adjustment front and back.
  189. Fuel system set up
  190. valve spring bearing
  191. Twin engine power steering question
  192. CMI Headers vs Stainless Marine
  193. Removing Silent Choice Exhaust ???
  194. .937 lifters?
  195. Rod bolts, main caps, and what not.
  196. Best oil filter with sandwich adapter and plugged bypass?
  197. Any suggestions on a bench buffer & polisher
  198. Borg Warner 72C transmission upgrades?
  199. Choosing Valve Covers
  200. Another Omc thread
  201. Smartcraft Alarm
  202. New Holley Ultra HP carburetor leaking fuel from throttle shafts....Ideas?
  203. Hyd. roller lifters to solid roller lifters?
  204. swapping k throttle
  205. NXT Transmission
  206. Piston to valve clearance - 454 Mag short block
  207. Fitch Fuel Catalysts
  208. Best place to order Mercury parts from
  209. Need an Anchor
  210. Corvette C-7 LT1 Engine for marine use?
  211. Silent Choice on a 525 EFI 29' Fever
  212. 731 or 741
  213. Oil pump thread
  214. De-tuning my 2001 ilmor supercat 517
  215. Missing skeg(s) and cavitation plate
  216. 502 mag torque #
  217. Is there any product that softens vinyl (interior)? What is the best cleaner?
  218. Drive couplers
  219. boat length?
  220. Blown head gasket and worn wrist pin... rebuild advise?
  221. Wellcraft scarab cv 7.4 v8 engine.
  222. Pressure checking manifold,headers
  223. Flat vs Roller, Blown 454
  224. Can you make a 502 mpi flow more air?
  225. 525 Header/Tailpipe issue
  226. 1" or 2" carb spacer
  227. Dyno proven 675-700 HP 540CI recipes?
  228. Talk to me about closed loop cooling...any reason not to?
  229. Need Help on Heads on Gen 5 454's
  230. Need Help on Heads on Gen 5 454's
  231. Upgrades to stock 350 sbc
  232. Hawk 502 specs
  233. Bearing clearances, oil weight, and more...
  234. Intake Manifold
  235. Fuel Pump and Filter mounting
  236. Hydraulic vs Electric trim tabs
  237. EFI intake
  238. GoPro Cam Choice. . . .
  239. Carb to EFI
  240. Time to rebuild the 502...
  241. Oil restrictor size hp500
  242. 1976 stinger jet boat
  243. Want more hp out if my 502?
  244. How do i get the air out of my K-280's trim tabs?
  245. Has anyone used the new merc digital trim indicators?
  246. Fountain bilge light - bulb ID
  247. How is compression ratio figured?
  248. Who's going to the PRI show next month
  249. IMCO fuel valve instructions please
  250. procharged 502 fuel system
  251. 540CI builds, MAX RPM?
  252. Bravo or Bravo x3
  253. Midrange and low RPM grunt. Discuss please.
  254. 2011 Sea Ray 240 captain seat cylinder adjustment
  255. HELP i have a gremlin onboard
  256. SB Exhaust manifolds
  257. 8' beam into 7'9" garage door
  258. Antifreeze for Winterize Mercury 700's?
  259. Cam Questions - Little Help/Direction needed
  260. single plane intake vs. dual plane
  261. Blue engine maint?
  262. Top end refresh?
  263. Enine Builders?
  264. 388 hustler that was in the classifieds
  265. Looking for some real out of the box thinking....
  266. another milkshake
  267. What size is this
  268. HP 500 valve covers....
  269. Best way to clean old fuel tanks
  270. ss rod ends?
  271. Weiand 177 or 256, which kits?
  272. Step By Step : Building An 871 Blower
  273. Baja 240 sport (24 outlaw) VS 250 (270)es
  274. Where to buy bolster tops?
  275. Fuel pump
  276. How to tell if its an HP gimble ring or not?
  277. Projected or non with blowers?
  278. Smashed Plugs on fresh re-build, any advice?
  279. Does prop slip increase or decrease with speed? Top speed less than expected.
  280. Smartcraft gauge rigging question
  281. What is this plate called and where can I get one?? SsmII
  282. Antifreeze/Magnesium question. (non boating related)
  283. 1999 vortec 454 yes or no
  284. Anyone change an Oil Thermostat in a HP500 Filter housing?
  285. Circulating Pump Size
  286. Using Marine battery in Truck?
  287. motor oils prefered on performance boats
  288. how to remove gas overflow stain side of boat?
  289. Holley fuel pump safety switch 12-810. 2 bad in one year.
  290. Engine Rebuilding
  291. header friendly sub for r44xls
  292. HELP PLEASE....Thoughts on repowering
  293. Roots Blower Sizing
  294. Engine Pre lube systems
  295. boat vapor locked after taking off fuel filter/water seperator
  296. company to handle blower DIS/REassembly and powdercoating?
  297. Gen 6 Heads on a Mk 4 Block
  298. Ebay water jacketed headers?
  299. Innovative Wideband A/F system - cable too short
  300. Revolution Marine Oil Reservoir
  301. Oil pressure safety
  302. Winter upgrades, LEDs, underwater lights, etc
  303. My quest for 60 MPH
  304. Stock power to Ilmor swap
  305. Outboard motor question
  306. Merc Racing 575 SCI running very rough/rich
  307. Kaama Question?
  308. Winterizing Question- Looking for Ideas
  309. Fuel stabablizer
  310. Fuel Filter
  311. 1988 Merc 420's
  312. Gas Ssteam Out Of Whipple Chargers
  313. Gauges Cycle/Sweep
  314. piston coatings
  315. merc twins 496HO will not exceed 2800
  316. Merlin heads
  317. Valve Springs & Rocker Arms - 525EFI's ???
  318. Exhaust Replacement ?
  319. Can we change our S/N
  320. Max safe RPM?
  321. changing throttle shifter configeration on Gaffrig
  322. What's a 502 block worth
  323. Gen 3 Cool Fuel Winterization?
  324. 496 ecm
  325. Found external leak on manifold - crack
  326. milkshake under stbd valve cover, hi water temp on the port side of the block.
  327. Looking for a Twin Disk mechanic
  328. sonic prowler 496HO PCM PROBELM??
  329. Machine shop in SouthEast Michigan
  330. Can I start the engines on the hose with the drives off?
  331. Hawk 525sc's
  332. Secondary idle screw adjustment on quick fuel 1050?
  333. Gen6 cylinder bore question max bore?
  334. 525 rebuilds with 250 hours
  335. Another bad motor
  336. Stainless marine gen 3 gaskets
  337. Power steering fluid tempature.
  338. Why do larger roots blowers use 2 carbs?
  339. Oil temp problem in my 572, need input/advice....
  340. Finally got a new tow rig! (any other 8.1 owners out there?)
  341. Need Boat Mechanic / Engine Builder in Palm Beach Area
  342. Smartcraft and gauges ?
  343. 598 build questions
  344. Profile picture
  345. Timing a custom supercharged engine
  346. gas tank
  347. Smoked 502 tonite
  348. Bbc with v6 module??
  349. Phenomenal experinece with MarineEngine.com
  350. Need engine advice N A 598 cubic inch rebuild
  351. 700 sci - over heat at high rpm only
  352. Twin Turbo Build
  353. Water Press. location
  354. Exhaust manifold differences 502 vs 525 efi
  355. Another Engine Dynoed today.
  356. WTF Did I Just Do. Considering a Formula 400 SS
  357. 33 Baja outlaw vs 32 fountain fever
  358. SBC Built, now looking for jet recommendations
  359. 502efi
  360. 525EFI Warm start problem - ??
  361. 29 fever triple digits
  362. Who makes the Black Thunder?
  363. Little help if possible
  364. Remote oil filter mounting heigth?
  365. Vibration above 4200
  366. Bravo1 drive goes down, but won't go up.
  367. What muffler / silence are these?
  368. big cubic inch chevy?s
  369. Sea Water Pump Pulley?
  370. 502 EFI, spark coming out of the coil, no spark at the spark plugs
  371. Thunderbolt IV sensors
  372. Twin engine boat porposing problem
  373. New Merc 540 replacement engine
  374. Inexpensive 454 mag performance up grades
  375. 500 efi upgrades
  376. Bennett trim tabs
  377. What problems to look for on Merc 700's
  378. Need some help with engine replacement
  379. Cam guru's please read
  380. Question On Coated Pistons
  381. big block chevy correct spark plugs
  382. Bbc valve cover question-hardin extreme
  383. Bravo upper internal plug?
  384. 502 HO Mag questions
  385. Mercury Outboard Mechanic
  386. Recurring gauge problem - 525EFI
  387. Stroker fuel injection
  388. Wet Exhaust to Dry Exhaust
  389. Windshield for a 2003 HTM 24ss???
  390. Mefi 1 to mefi 3 question
  391. The Blower Shop Intercoolers WTF!!!
  392. single SSM 6 drive height? Or who to call?
  393. Weird 525EFI Question
  394. Gimbal housing help needed
  395. 502 Merc parts ID
  396. Trim Tab Advice??
  397. merc mefi 3 question
  398. Transom that was mounted with an X drive mounting a Bravo 1 question
  399. 496 HO 152 IAC Output Code
  400. who do i contact to fix my username to post a classified ad
  401. 1997 502 EFI cranks but won't start, will try and run after shot of starter fluid
  402. Fuel System Fittings
  403. 377 flywheel
  404. 496 HO maintenance while replacing transom assembly
  405. What are they worth?
  406. Vibration on down trim
  407. Where to purchase oil coolers and hardware
  408. 525efi rev limiter
  409. prop changes from 1.5 to 1.36
  410. 1999 Merc 454 mag ign issues
  411. motors bogging ? fuel pressure maybe?
  412. Engine Quest/RHS 320 Iron heads
  413. Starving for fuel...
  414. Can These Be Repaired ????
  415. QUICKSILVER SBC long block assembly worth building?
  416. I need to find a good shop in the Gulf Shores, Al or Pensacola, Fl area
  417. Aluminum Head Exchange to Steel Head
  418. Prop shaft carrier bearing stuck
  419. Aluminum Head Repair
  420. how hard is it to mefi tune my own after i install procharger
  421. 5 blade on 2004 288 sunsation
  422. Value Of a 91 Mark IV 502 Mag
  423. dry exhaust
  424. Volvo Penta 7.4 Gi vs GSi rev limiter
  425. tall deck to short deck exhaust problems
  426. Opening a can of worms
  427. merc xr gear pinion
  428. Trying to identify a pair of Mercury OB's
  429. Front Seal Unazzed
  430. 1998 Mercury 250 EFI
  431. 496 with whipple worth
  432. 350 mpi possable reversion
  433. Carbed 502/502HP fueling issues on 1996 Baja 272 Islander
  434. 502 magnum mpi IAC crossover
  435. Wrong oil?
  436. 454 Baja overheating
  437. Anyone know how too get ahold of mr gadgets?????
  438. Felpro 17042 vs 17046
  439. Roots Supercharger experts Snout problems
  440. 500efi - starter burned up + more - Help!
  441. Fuel supply issues
  442. Checkmate 251 Convincor vs Profile 26
  443. 1989 Power Play Conquest Decals
  444. Latham Steering Leak
  445. 502 EFI shutting down after 5 seconds of run time
  446. Part numbers question
  447. Volvo Duo prop
  448. Hp 500 carb setup help
  449. One exhaust is only shooting out water
  450. HP500 boost question
  451. Help 502 EFI stalls out
  452. 1996 HP 500 Carb lifter part numbers
  453. Removing CATs on new 8.2L motor
  454. Low oil pressure and Oil cooler questions
  455. Ram air
  456. Mayfair Hydraulic Steering Ram Rebuild help.
  457. 2001 555 PCM to mefi 3
  458. motor not hitting WOT?
  459. Need help with engine issue
  460. Knock came and knock left
  461. Paging skater Scott 36
  462. Mercruiser 496 ho overspeed code
  463. Raymarine DVD
  464. A little roots blower info.
  465. Can you please direct me to some Velvet Drive Identification information.
  466. Are my 454's magnum's??
  467. which fuel transfer pump to use ?
  468. 500 efi fuel fouling plugs
  469. 525EFI Header Failures - CMI vs Hardin - All failing
  470. Mercruiser Computer Programming
  471. 525 EFI sea pump stops pumping
  472. Fuel Pressure
  473. Should I scrap my anti-spam valves?
  474. 088 heads on gen 5 454 ?
  475. Trim and Tilt Pumps, why is one so much faster??
  476. what is killing my fuel pumps?
  477. SBC to BBC Conversion Questions
  478. Bilge pump in Fountain left running dry- are they toast?
  479. solenoid or trim pump bad?
  480. Gaffrig controls neutral safety switch
  481. 600SCI Gurus Needed -- No BOOST
  482. 088 Heads Max lift?
  483. adding 174 blower
  484. 502 Mag Removal
  485. 525 Header issue; I'm stumped..
  486. Top speed and cruise speed and gearing advice new to forum
  487. Pump for toilette and post-swim hotwash
  488. What Size Carb.
  489. Anybody use these boat dollies?
  490. Looking for advice
  491. SSM V alignment tool
  492. Starboard motor won't start - electrical, fuel?
  493. Mirage won't plane off
  494. Can anyone help identify this boat, and help provide feedback on possible purchase.
  495. 500 EFI Fuel Line longevity
  496. Cigarette 20 Update
  497. Fuel feed issues
  498. Time to replace fuel lines?
  499. Misfiring carb 502
  500. How much does Deck weigh on a Formula 302 SR1. I want to lift it to access stringers