View Full Version : General Q & A




  1. 700 sci whipple upgrades
  2. Differences between K plane 280 vs 300
  3. Backwards sea pump
  4. 049 oval port heads
  5. Symptom of leaky header
  6. Neutral balance Harmonic balancers? middle of the line?
  7. 502 MAG MPI Cam swap
  8. Still Looking!
  9. Running a boat on the hose in freezing temps?
  10. superchillers
  11. ignition coils
  12. Mercruiser HP425 Gen V Big Block pistons
  13. Did GM sell a 509 block from factory
  14. The trouble with Blowers is:
  15. Stainless exhaust tip flappers ???
  16. What cams will work with stock lifters.
  17. Knock sensors for 502 mag mpi
  18. Another build dyno'd today. Whippled 509.
  19. Compression Ratio
  20. Anyone Been To The Louisville KY Boat Show??
  21. Installing new Camshaft
  22. Nordskog GPS speedometer wiring..
  23. Facebook tech.
  24. 1994 mercury racing hp 465?
  25. 454 cam
  26. The GM/Merc Rectangle port head. Discuss.
  27. morel hyd roller lifters
  28. Pushrods
  29. Who has 575sci TB?? any motor shops??
  30. Big cube n/a combo's
  31. What head should I use
  32. Leaking Trim/Trim Tab Pumps
  33. Engine Guys help (scan tool to use) on 97 454mag mpi's
  34. Diacom software ?? - where to hook up on 525EFI ?
  35. 502's with roller cams have some saltwater spots on them, Replace or run?
  36. 454/502 Mag Camshaft GM # 12551622
  37. 540 Clearances and oil pressure thread...
  38. Identify this raw water pump?
  39. cnc d heads
  40. Piston Mercruiser 496 HO
  41. Machining Fuel Rails
  42. 454 Gen 6 Engine Cam Question
  43. 600SC mechanical fuel pump ability??
  44. Looking to instal a 496 Mag HO where there was a 7.4 MPI
  45. Procharged 502 Mag Oil Cooler Recommendations
  46. Bravo One outdrive
  47. 700hp 540s
  48. 454 rebuild with blower... Pistons and clearances.
  49. Help! - what happened to champion cylinder head co, palm coast, fl?
  50. good rockers for 6000 rpm, 540CI combo??
  51. 525 whipple charged engine weight
  52. Flywheel balancing
  53. Broken xr case repair?
  54. B&M blower identification
  55. noise under valve cover
  56. Need FlyWheels...Internally Balanced
  57. Anyone running Imco powerflow manifolds on ZZ502
  58. TRS Values
  59. any proffestional tile setters looking for work
  60. Prop slip increase with speed.
  61. Oil Pan Swap / Value
  62. Carb vs Fuel Inj?
  63. CMI headers leaking....HELP
  64. anybody with 496 HO using stainless marine exhaust?
  65. Elbow restrictor gasket vs full flow gasket
  66. Would you guys use this?
  67. velvit drive pump
  68. Rubberized spray flooring?
  69. Couple quick questions - piston install
  70. Tuners or Chips?
  71. How many RPM's can the stock 500HP rotating assembly take?
  72. Who is not running 45* valve angle?
  73. In-Control Shifter
  74. Crank to crank measurement / drive centers
  75. Bumpers and ropes???
  76. What oil pan is this???? Gen6 bbc
  77. 87 scarab excel 26 convert to bravo is it worth it?
  78. powerquest 270 laser cockpit
  79. Article about valve angles
  80. New boat soon, 32' BT, 29' Scarab, 31' Scarab, or another Formula??
  81. Piston top displacement stats needed
  82. worth the trouble?? 47 fountain
  83. New carpet for a Cigarette 20
  84. Water preassure in Bravo XR?
  85. Storage of gasoline
  86. conversion i/o to o/b help.... pics... info... anything
  87. Couple quick questions
  88. Grilling go fast
  89. Good mechanic
  90. lightning headers in a 25 Daytona?
  91. Mechanic needed pompano beach area
  92. 502 mag mpi not priming oil??
  93. Turndowns and water reversion?
  94. Fuel Stabilizer or Octane Booster?
  95. Found a 525 short block! What's it worth?
  96. +.300 lifters
  97. Baja 33 Outlaw Parts
  98. Search Tempest - Trojen virus??
  99. The million dollar question
  100. msd
  101. determining oil
  102. EFI 525 rear mounted camshaft sensor???
  103. Merc 700sci hrs/lifespan before rebuild
  104. Roots supercharger intake question
  105. Trouble free 525efi - do they exist?
  106. Different size headers
  107. Blower Application - Fuel Pressure Reg. & Return Valve
  108. 502 Ring Recommendation Please
  109. Good Bad opinion Formula 292 or 312
  110. original motors in a 91 sutphen
  111. Leaking Hatch Rams
  112. Mesa Balancing
  113. HTM oil pressure gauge
  114. Regular or Swept back
  115. Budget 454 Build
  116. 420hp 454
  117. benefits of distributor-less ignition
  118. 454 Repower
  119. 500 efi
  120. Dropping some weight on a HP500 carb?
  121. Any one interested in a boat move New Orleans to Detroit Area
  122. Best Cam Choice - Non-roller 350 with Vortec heads
  123. Steering Wheel rotary circuit switch?
  124. Carb talk
  125. Carb CFM?
  126. Gil Manifold Thoughts
  127. head gasket ?
  128. Going blown have a few questions?
  129. 97 PQ 270 laser wt twin 350 mags to 383 400hp what kinda speed
  130. 350 mag rebuild to 383. oil cooler Question
  131. AN fittings and Stainless braided lines
  132. what's the best clamp on muffler/silencer
  133. Formula 242 drive height.
  134. B&M 250 vs 420 Mega Blower
  135. 2001 Sea Ray 280 SS Engine Question
  136. Low water pickup depth below bottom
  137. Have you seen this exhaust manifold before????
  138. 500HP top end in a 502 MAG
  139. Performance Boating Magazine
  140. 525EFI Valve Springs Concerns
  141. Favorite BBC Rod Thread
  142. Upgrades to Cabin Door and Hatches.
  143. Calling all mechanics
  144. Pulled one of my gimbals and the transom is in great shape! Do I still replace it?
  145. Looking to set up a back-up bullet for the chamber
  146. HP 500 Head and Cam upgrade
  147. Alternates for Bravo drives
  148. 7.4 mpi stock cam specs needed
  149. Can you keep the thermostat and circulating pump on roots type blower motors?
  150. engine adjustment front and back.
  151. Fuel system set up
  152. valve spring bearing
  153. Twin engine power steering question
  154. CMI Headers vs Stainless Marine
  155. Removing Silent Choice Exhaust ???
  156. .937 lifters?
  157. Rod bolts, main caps, and what not.
  158. Best oil filter with sandwich adapter and plugged bypass?
  159. Any suggestions on a bench buffer & polisher
  160. Borg Warner 72C transmission upgrades?
  161. Choosing Valve Covers
  162. Another Omc thread
  163. Smartcraft Alarm
  164. New Holley Ultra HP carburetor leaking fuel from throttle shafts....Ideas?
  165. Hyd. roller lifters to solid roller lifters?
  166. swapping k throttle
  167. NXT Transmission
  168. Piston to valve clearance - 454 Mag short block
  169. Fitch Fuel Catalysts
  170. Best place to order Mercury parts from
  171. Need an Anchor
  172. Corvette C-7 LT1 Engine for marine use?
  173. Silent Choice on a 525 EFI 29' Fever
  174. 731 or 741
  175. Oil pump thread
  176. De-tuning my 2001 ilmor supercat 517
  177. Missing skeg(s) and cavitation plate
  178. 502 mag torque #
  179. Is there any product that softens vinyl (interior)? What is the best cleaner?
  180. Drive couplers
  181. boat length?
  182. Blown head gasket and worn wrist pin... rebuild advise?
  183. Wellcraft scarab cv 7.4 v8 engine.
  184. Pressure checking manifold,headers
  185. Flat vs Roller, Blown 454
  186. Can you make a 502 mpi flow more air?
  187. 525 Header/Tailpipe issue
  188. 1" or 2" carb spacer
  189. Dyno proven 675-700 HP 540CI recipes?
  190. Talk to me about closed loop cooling...any reason not to?
  191. Need Help on Heads on Gen 5 454's
  192. Need Help on Heads on Gen 5 454's
  193. Upgrades to stock 350 sbc
  194. Hawk 502 specs
  195. Bearing clearances, oil weight, and more...
  196. Intake Manifold
  197. Fuel Pump and Filter mounting
  198. Hydraulic vs Electric trim tabs
  199. EFI intake
  200. GoPro Cam Choice. . . .
  201. Carb to EFI
  202. Time to rebuild the 502...
  203. Oil restrictor size hp500
  204. 1976 stinger jet boat
  205. Want more hp out if my 502?
  206. How do i get the air out of my K-280's trim tabs?
  207. Has anyone used the new merc digital trim indicators?
  208. Fountain bilge light - bulb ID
  209. How is compression ratio figured?
  210. Who's going to the PRI show next month
  211. IMCO fuel valve instructions please
  212. procharged 502 fuel system
  213. 540CI builds, MAX RPM?
  214. Bravo or Bravo x3
  215. Midrange and low RPM grunt. Discuss please.
  216. 2011 Sea Ray 240 captain seat cylinder adjustment
  217. HELP i have a gremlin onboard
  218. SB Exhaust manifolds
  219. 8' beam into 7'9" garage door
  220. Antifreeze for Winterize Mercury 700's?
  221. Cam Questions - Little Help/Direction needed
  222. single plane intake vs. dual plane
  223. Blue engine maint?
  224. Top end refresh?
  225. Enine Builders?
  226. 388 hustler that was in the classifieds
  227. Looking for some real out of the box thinking....
  228. another milkshake
  229. What size is this
  230. HP 500 valve covers....
  231. Best way to clean old fuel tanks
  232. ss rod ends?
  233. Weiand 177 or 256, which kits?
  234. Step By Step : Building An 871 Blower
  235. Baja 240 sport (24 outlaw) VS 250 (270)es
  236. Where to buy bolster tops?
  237. Fuel pump
  238. How to tell if its an HP gimble ring or not?
  239. Projected or non with blowers?
  240. Smashed Plugs on fresh re-build, any advice?
  241. Does prop slip increase or decrease with speed? Top speed less than expected.
  242. Smartcraft gauge rigging question
  243. What is this plate called and where can I get one?? SsmII
  244. Antifreeze/Magnesium question. (non boating related)
  245. 1999 vortec 454 yes or no
  246. Anyone change an Oil Thermostat in a HP500 Filter housing?
  247. Circulating Pump Size
  248. Using Marine battery in Truck?
  249. motor oils prefered on performance boats
  250. how to remove gas overflow stain side of boat?
  251. Holley fuel pump safety switch 12-810. 2 bad in one year.
  252. Engine Rebuilding
  253. header friendly sub for r44xls
  254. HELP PLEASE....Thoughts on repowering
  255. Roots Blower Sizing
  256. Engine Pre lube systems
  257. boat vapor locked after taking off fuel filter/water seperator
  258. company to handle blower DIS/REassembly and powdercoating?
  259. Gen 6 Heads on a Mk 4 Block
  260. Ebay water jacketed headers?
  261. Innovative Wideband A/F system - cable too short
  262. Revolution Marine Oil Reservoir
  263. Oil pressure safety
  264. Winter upgrades, LEDs, underwater lights, etc
  265. My quest for 60 MPH
  266. Stock power to Ilmor swap
  267. Outboard motor question
  268. Merc Racing 575 SCI running very rough/rich
  269. Kaama Question?
  270. Winterizing Question- Looking for Ideas
  271. Fuel stabablizer
  272. Fuel Filter
  273. 1988 Merc 420's
  274. Gas Ssteam Out Of Whipple Chargers
  275. Gauges Cycle/Sweep
  276. piston coatings
  277. merc twins 496HO will not exceed 2800
  278. Merlin heads
  279. Valve Springs & Rocker Arms - 525EFI's ???
  280. Exhaust Replacement ?
  281. Can we change our S/N
  282. Max safe RPM?
  283. changing throttle shifter configeration on Gaffrig
  284. What's a 502 block worth
  285. Gen 3 Cool Fuel Winterization?
  286. 496 ecm
  287. Found external leak on manifold - crack
  288. milkshake under stbd valve cover, hi water temp on the port side of the block.
  289. Looking for a Twin Disk mechanic
  290. sonic prowler 496HO PCM PROBELM??
  291. Machine shop in SouthEast Michigan
  292. Can I start the engines on the hose with the drives off?
  293. Hawk 525sc's
  294. Secondary idle screw adjustment on quick fuel 1050?
  295. Gen6 cylinder bore question max bore?
  296. 525 rebuilds with 250 hours
  297. Another bad motor
  298. Stainless marine gen 3 gaskets
  299. Power steering fluid tempature.
  300. Why do larger roots blowers use 2 carbs?
  301. Oil temp problem in my 572, need input/advice....
  302. Finally got a new tow rig! (any other 8.1 owners out there?)
  303. Need Boat Mechanic / Engine Builder in Palm Beach Area
  304. Smartcraft and gauges ?
  305. 598 build questions
  306. Profile picture
  307. Timing a custom supercharged engine
  308. gas tank
  309. Smoked 502 tonite
  310. Bbc with v6 module??
  311. Phenomenal experinece with MarineEngine.com
  312. Need engine advice N A 598 cubic inch rebuild
  313. 700 sci - over heat at high rpm only
  314. Twin Turbo Build
  315. Water Press. location
  316. Exhaust manifold differences 502 vs 525 efi
  317. Another Engine Dynoed today.
  318. WTF Did I Just Do. Considering a Formula 400 SS
  319. 33 Baja outlaw vs 32 fountain fever
  320. SBC Built, now looking for jet recommendations
  321. 502efi
  322. 525EFI Warm start problem - ??
  323. 29 fever triple digits
  324. Who makes the Black Thunder?
  325. Little help if possible
  326. Remote oil filter mounting heigth?
  327. Vibration above 4200
  328. Bravo1 drive goes down, but won't go up.
  329. What muffler / silence are these?
  330. big cubic inch chevy?s
  331. Sea Water Pump Pulley?
  332. 502 EFI, spark coming out of the coil, no spark at the spark plugs
  333. Thunderbolt IV sensors
  334. Twin engine boat porposing problem
  335. New Merc 540 replacement engine
  336. Inexpensive 454 mag performance up grades
  337. 500 efi upgrades
  338. Bennett trim tabs
  339. What problems to look for on Merc 700's
  340. Need some help with engine replacement
  341. Cam guru's please read
  342. Question On Coated Pistons
  343. big block chevy correct spark plugs
  344. Bbc valve cover question-hardin extreme
  345. Bravo upper internal plug?
  346. 502 HO Mag questions
  347. Mercury Outboard Mechanic
  348. Recurring gauge problem - 525EFI
  349. Stroker fuel injection
  350. Wet Exhaust to Dry Exhaust
  351. Windshield for a 2003 HTM 24ss???
  352. Mefi 1 to mefi 3 question
  353. The Blower Shop Intercoolers WTF!!!
  354. single SSM 6 drive height? Or who to call?
  355. Weird 525EFI Question
  356. Gimbal housing help needed
  357. 502 Merc parts ID
  358. Trim Tab Advice??
  359. merc mefi 3 question
  360. Transom that was mounted with an X drive mounting a Bravo 1 question
  361. 496 HO 152 IAC Output Code
  362. who do i contact to fix my username to post a classified ad
  363. 1997 502 EFI cranks but won't start, will try and run after shot of starter fluid
  364. Fuel System Fittings
  365. 377 flywheel
  366. 496 HO maintenance while replacing transom assembly
  367. What are they worth?
  368. Vibration on down trim
  369. Where to purchase oil coolers and hardware
  370. 525efi rev limiter
  371. prop changes from 1.5 to 1.36
  372. 1999 Merc 454 mag ign issues
  373. motors bogging ? fuel pressure maybe?
  374. Engine Quest/RHS 320 Iron heads
  375. Starving for fuel...
  376. Can These Be Repaired ????
  377. QUICKSILVER SBC long block assembly worth building?
  378. I need to find a good shop in the Gulf Shores, Al or Pensacola, Fl area
  379. Aluminum Head Exchange to Steel Head
  380. Prop shaft carrier bearing stuck
  381. Aluminum Head Repair
  382. how hard is it to mefi tune my own after i install procharger
  383. 5 blade on 2004 288 sunsation
  384. Value Of a 91 Mark IV 502 Mag
  385. dry exhaust
  386. Volvo Penta 7.4 Gi vs GSi rev limiter
  387. tall deck to short deck exhaust problems
  388. Opening a can of worms
  389. merc xr gear pinion
  390. Trying to identify a pair of Mercury OB's
  391. Front Seal Unazzed
  392. 1998 Mercury 250 EFI
  393. 496 with whipple worth
  394. 350 mpi possable reversion
  395. Carbed 502/502HP fueling issues on 1996 Baja 272 Islander
  396. 502 magnum mpi IAC crossover
  397. Wrong oil?
  398. 454 Baja overheating
  399. Anyone know how too get ahold of mr gadgets?????
  400. Felpro 17042 vs 17046
  401. Roots Supercharger experts Snout problems
  402. 500efi - starter burned up + more - Help!
  403. Fuel supply issues
  404. Checkmate 251 Convincor vs Profile 26
  405. 1989 Power Play Conquest Decals
  406. Latham Steering Leak
  407. 502 EFI shutting down after 5 seconds of run time
  408. Part numbers question
  409. Volvo Duo prop
  410. Hp 500 carb setup help
  411. One exhaust is only shooting out water
  412. HP500 boost question
  413. Help 502 EFI stalls out
  414. 1996 HP 500 Carb lifter part numbers
  415. Removing CATs on new 8.2L motor
  416. Low oil pressure and Oil cooler questions
  417. Ram air
  418. Mayfair Hydraulic Steering Ram Rebuild help.
  419. 2001 555 PCM to mefi 3
  420. motor not hitting WOT?
  421. Need help with engine issue
  422. Knock came and knock left
  423. Paging skater Scott 36
  424. Mercruiser 496 ho overspeed code
  425. Raymarine DVD
  426. A little roots blower info.
  427. Can you please direct me to some Velvet Drive Identification information.
  428. Are my 454's magnum's??
  429. which fuel transfer pump to use ?
  430. 500 efi fuel fouling plugs
  431. 525EFI Header Failures - CMI vs Hardin - All failing
  432. Mercruiser Computer Programming
  433. 525 EFI sea pump stops pumping
  434. Fuel Pressure
  435. Should I scrap my anti-spam valves?
  436. 088 heads on gen 5 454 ?
  437. Trim and Tilt Pumps, why is one so much faster??
  438. what is killing my fuel pumps?
  439. SBC to BBC Conversion Questions
  440. Bilge pump in Fountain left running dry- are they toast?
  441. solenoid or trim pump bad?
  442. Gaffrig controls neutral safety switch
  443. 600SCI Gurus Needed -- No BOOST
  444. 088 Heads Max lift?
  445. adding 174 blower
  446. 502 Mag Removal
  447. 525 Header issue; I'm stumped..
  448. Top speed and cruise speed and gearing advice new to forum
  449. Pump for toilette and post-swim hotwash
  450. What Size Carb.
  451. Anybody use these boat dollies?
  452. Looking for advice
  453. SSM V alignment tool
  454. Starboard motor won't start - electrical, fuel?
  455. Mirage won't plane off
  456. Can anyone help identify this boat, and help provide feedback on possible purchase.
  457. 500 EFI Fuel Line longevity
  458. Cigarette 20 Update
  459. Fuel feed issues
  460. Time to replace fuel lines?
  461. Misfiring carb 502
  462. How much does Deck weigh on a Formula 302 SR1. I want to lift it to access stringers
  463. 525 EFI Alarm
  464. Noise when shifting
  465. 525 EFI H2O pressure?
  466. oil temp
  467. Merc 5.7 2bbl 1998 unique concerns.
  468. Replacing dipstick tube in 454
  469. Oil pressure problems!
  470. 454 to 502 repower suggestions
  471. PBM/Erson rods and cranks, comparable??
  472. 500efi overheating hot port header, help
  473. jet size
  474. Motor question for the Guru's...
  475. HP 500 carb fuel mech pumps
  476. Intake to head sealing issue question
  477. Collapsed lifter, bent pushrod
  478. anyone make hinge pin covers?
  479. Value 26 Prowler
  480. Ride quality older 38's which ones to look at
  481. need HEI DUI distributor info
  482. Hardin Marine - Hurricane Lite 525 Headers -- who's got 'em??
  483. solid or rubber prop hub???
  484. 525sc conversion
  485. 7.4 freshwater cooling
  486. Lower than I like Oil Pressure
  487. marine a/c units
  488. aftermarket mechanical fuel pump
  489. need help with code 42 on V6
  490. O2 guage
  491. Bravo 1 Vibration in forward drive not reverse??
  492. Dual trim pumps, one switch?
  493. Remote trim switches
  494. Reading Starts Me Thinking - More Power
  495. Water in fuel lean condition.
  496. Low oil pressure in brand new 502 efi
  497. Serpentine crossover kit
  498. power gone from my 8.2 mercuiser
  499. Moisture in valve covers with oil thermostat?
  500. Power steering leak