Go Back  Offshoreonly.com > Technical > General Q & A
LS Build: In Progress >

LS Build: In Progress

Like Tree106Likes

LS Build: In Progress

Reply

Old 01-20-2019, 10:53 PM
  #21
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
My Boat: 2003 Eliminator Daytona
Posts: 393
Default

Originally Posted by getrdunn View Post
I heard about your 67 gto death grip ride. Bad azz from what I heard. What ratio rockers you running. I may have missed in OP.

Dennis r built and just sold a while back some stroked ls3 with ls3 cnc ported heads and made like 650 hp at 6,500. Ck out his build sheet. Ran them in a 32 sunsation 88 mph.
I guess Tom told you about her. Puckered his butthole up a lil with some 100mph burnouts. Lol. Im running a 1.7 ratio. Im letting my cam lobe choice do the work. The second two ls engine being built are actually for Tom in the Sunny I gave him. Much milder build than mine though. I spoke to dennis when I was in michigan about his builds and have his cam specs. Very nice numbers on his part and on hell of a nice guy. Im looking to drag power down into a more usuable range for where I plan on running. I am specing a single pattern as we speak. Contemplating 232/232 114+2 and 237/237 114.5+4.5. Events look good and both keep me in range of rpm. Lower torque trade off is contemplation.
mggdoors is offline  
Reply With Quote
Old 01-21-2019, 10:34 AM
  #22
Registered
 
Join Date: Jan 2006
My Boat: 30 Sutphen (for sale)
Posts: 2,382
Default

so now your gonna run a 3/4 race cam.
sutphen 30 is offline  
Reply With Quote
Old 01-21-2019, 10:40 AM
  #23
Registered
 
Join Date: Jul 2017
Location: Harrington DE
My Boat: 1996 Scarab P-29
Posts: 30
Default

Originally Posted by sutphen 30 View Post
so now your gonna run a 3/4 race cam.

have not not heard that term since 1987
Hot Rod 29 is offline  
Reply With Quote
Old 01-21-2019, 11:12 AM
  #24
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
My Boat: 2003 Eliminator Daytona
Posts: 393
Default

Originally Posted by sutphen 30 View Post
so now your gonna run a 3/4 race cam.
Your killing me Smalls. Lol. Ordered 237/237 114.5+3.5 .621/.612. Very broad power but will loose my past peak power without exhaust split which is not a concern. I build my cam totally off of events. Not @.050 or adv numbers. Concern with this cam is planing as the daytona is very tricky to push over and low end will indeed suffer. Counting on the dual plane to do its job there. Will have great power from 3500-6200 though. We will still be utilizing the original cam on the Dominator which is a 6.0 ls3 heads.

Last edited by mggdoors; 01-21-2019 at 11:17 AM.
mggdoors is offline  
Reply With Quote
Old 01-22-2019, 10:02 AM
  #25
Registered
 
Join Date: Jan 2006
My Boat: 30 Sutphen (for sale)
Posts: 2,382
Default

marine motors like some split in the camshaft,even the car guys w/ good headers run split.just remember to turn up that correction factor knob on the dyno.
14 apache and hogie roll like this.
sutphen 30 is offline  
Reply With Quote
Old 01-22-2019, 10:08 AM
  #26
Registered
iTrader: (1)
 
Join Date: Oct 2013
Location: SF Bay Area
My Boat: 1997 Baja Islander 272
Posts: 2,540
Default

I love projects like this and looking forward to the results.
getrdunn likes this.
Baja Rooster is offline  
Reply With Quote
Old 01-22-2019, 11:44 AM
  #27
Registered
Platinum Member
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
My Boat: 12 meter
Posts: 5,933
Default

Keep up the good work and keep us posted regardless. Hey worse case scenario you don't achieve your goals but you certainly don't reach them by couch sitting just thinking about it. Your going after it. Would be great if you could try a couple different cams on the dyno and share your results. That's kind of the backbone of this site and much appreciated by most. Also do a search on even split cams here. There was a thread on it a fews ago if I recall. The last custom grinds I bought had only a 4 deg split and made great power once I got the valvetrain stable. The last even split cam I ran was in a 383. Never forget comp labeled it as king of the drive in cam and that it was. 292 magnum cam.

I ran that with GM worked over camel back heads (closed chamber) with a non superior exhaust port. Was a crap shoot at the time being only 18 but made excellent power.
getrdunn is offline  
Reply With Quote
Old 01-22-2019, 12:39 PM
  #28
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
My Boat: 2003 Eliminator Daytona
Posts: 393
Default

Originally Posted by getrdunn View Post
Keep up the good work and keep us posted regardless. Hey worse case scenario you don't achieve your goals but you certainly don't reach them by couch sitting just thinking about it. Your going after it. Would be great if you could try a couple different cams on the dyno and share your results. That's kind of the backbone of this site and much appreciated by most. Also do a search on even split cams here. There was a thread on it a fews ago if I recall. The last custom grinds I bought had only a 4 deg split and made great power once I got the valvetrain stable. The last even split cam I ran was in a 383. Never forget comp labeled it as king of the drive in cam and that it was. 292 magnum cam.

I ran that with GM worked over camel back heads (closed chamber) with a non superior exhaust port. Was a crap shoot at the time being only 18 but made excellent power.
Hi John. Testing with ls3 heads has shown on a stock displacement 6.0-6.2 that a 0-4 split, reverse and forward split believe it or not, works excellent. On a 4 stroke the same applies. The difference I have found is in the overlap #. Stock displacement is happy around 4 where the 4 stroke likes 8 degrees. The cam I specced nails these nimbers. The lack of split will loose my carrying of the power past peak but I am not shifting gears where We need to rev past peak to drop back into the powerband on the shift. I will hit the peak and set the rev limiter. Alot of guys think these heads need a big split due to the .500-.600 ie numbersbut never consider the 2-3-4 ie ratio which is excellent. I will definitley condider cutting a few more cams for testing purposes to show gains and losses.
mggdoors is offline  
Reply With Quote
Old 01-22-2019, 01:32 PM
  #29
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
My Boat: 2003 Eliminator Daytona
Posts: 393
Default

Originally Posted by sutphen 30 View Post
marine motors like some split in the camshaft,even the car guys w/ good headers run split.just remember to turn up that correction factor knob on the dyno.
I respectfully disagree. The events justify the cam. Mainly ivc and evo. The ivc determines peak. The evo determines where the powerband is located. The split determines how well it holds power past peak but also softens low and mid power creates unneeded overlap on in my case a rather lazy intake port. Low initial velocity creates intake reversion due to overlap. So one this particular head I do want less split which is clearly justified. Ill post a pic of the cam card when they arrive so you know my upcoming dyno sheets are not bs. Ill also post the baro. Humidity. Temp and correction factor being used. Wherever it ends up hp wise is where it is. But the numbers will be real and a good aid for future builds. Again the pount of this thread.
mggdoors is offline  
Reply With Quote
Old 01-22-2019, 09:19 PM
  #30
Platinum Member
Platinum Member
iTrader: (1)
 
242LS's Avatar
 
Join Date: Jun 2009
Location: Medway MA
My Boat: Sutphen 33 Outrageous
Posts: 842
Default

Originally Posted by getrdunn View Post
I heard about your 67 gto death grip ride. Bad azz from what I heard. What ratio rockers you running. I may have missed in OP.

Dennis r built and just sold a while back some stroked ls3 with ls3 cnc ported heads and made like 650 hp at 6,500. Ck out his build sheet. Ran them in a 32 sunsation 88 mph.

I bought them from Dennis. 416CI, 651HP @6500, 563Tq @5000. They're beautiful. Going in a Sutphen 30 Ocean Pacer this summer.




Cam sheet:

Last edited by 242LS; 01-22-2019 at 09:26 PM.
242LS is offline  
Reply With Quote

OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser