LS7 build started
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
Im not telling you NOT to check piston to valve clearance but I bought an LS7 from GM had the heads surfaced,decked the block,used all the stock parts like you have and put in an Ultradyne cam ( now Bullet Cams). I dont remember what the actual clearance was but it had plenty I degreed the cam to the spec card and also ran it 4* advanced.
I dont know the part # but here are the specs
264*@.050 int
268*@.050exh
.670 lift int/exh
110* lobe
My combo made 625 peak hp @ 6600 on an engine dyno
I had no issues with head gaskets using the stock head bolts and FelPro HP gaskets but I always ran race fuel
This was in a 3400lb camaro with 10" tire leaf springs and slapper bars I ran a 4200 ATI converter with a TH350 and 4:10 gear it ran high 10.30's @ 130
I dont know the part # but here are the specs
264*@.050 int
268*@.050exh
.670 lift int/exh
110* lobe
My combo made 625 peak hp @ 6600 on an engine dyno
I had no issues with head gaskets using the stock head bolts and FelPro HP gaskets but I always ran race fuel
This was in a 3400lb camaro with 10" tire leaf springs and slapper bars I ran a 4200 ATI converter with a TH350 and 4:10 gear it ran high 10.30's @ 130
ill be happy to run any kind of 10's lol going in a 78camaro, short block will be done this week
changed plans on solid roller went with Comp Cam Nostalgia ZL1, flat tappet solid, cam specs are 262/272@.050 581/622 110 ls any thoughts on that cam choice? anyone know of someone running one?hope its nasty lol
Last edited by MR NICE; Jul 8, 2012 at 01:54 PM. Reason: spelling
Race Director
Joined: May 2005
Posts: 10,674
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From: Millington Illinois
St. Jude Donor '08-'09
ill be happy to run any kind of 10's lol going in a 78camaro, short block will be done this week changed plans on solid roller went with Comp Cam Nostalgia ZL1, flat tappet solid, cam specs are 262/272@.050 581/622 110 ls any thoughts on that cam choice? anyone know of someone running one?hope its nasty lolhttp://forums.corvetteforum.com/c3-t...ld-thread.html
There is a dyno video toward the end. If your using it I would also use beehive springs as the recommended spring rates were not adequate for high rpm use.
Last edited by 63mako; Jul 8, 2012 at 03:26 PM.
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,361
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From: Downriver Mi.
Last edited by MR NICE; Jul 17, 2012 at 10:08 PM.
Melting Slicks
Joined: Oct 2002
Posts: 2,314
Likes: 111
From: St Louis MO
ill be happy to run any kind of 10's lol going in a 78camaro, short block will be done this week changed plans on solid roller went with Comp Cam Nostalgia ZL1, flat tappet solid, cam specs are 262/272@.050 581/622 110 ls any thoughts on that cam choice? anyone know of someone running one?hope its nasty lolYour cam choice is very close to stock and will run & sound great!
E85 works great!
Race Director
Joined: Jan 2000
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From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
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LS-7's were killer bracket race motors. Used to mess with them all the time. The old Crane R262 and similar series cams with .714" lift worked well in them. I'd probably use a 108 or so LSA if I was going to have good fuel anyway to help wake it up some more.
JIM
JIM
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
I'm having a hard time deciding which valve springs to run
Called comp cam 3 times different advice all 3 times, anyway so far 924 spring, 930 spring,and a bee hive spring that is good to 590.lift?my cam is 622 lift on the exh with .012 for lash
what do you guys think i should do about this?any suggestions?
Called comp cam 3 times different advice all 3 times, anyway so far 924 spring, 930 spring,and a bee hive spring that is good to 590.lift?my cam is 622 lift on the exh with .012 for lashwhat do you guys think i should do about this?any suggestions?
Last edited by MR NICE; Sep 3, 2012 at 02:33 PM. Reason: spelling
Melting Slicks
Joined: Oct 2002
Posts: 2,314
Likes: 111
From: St Louis MO
The stock springs for the GM LS7 (pn3959180) cam are 1.487" OD, and 116# at 1.88", with coil bind at 1.100"; and a rate of 317 #/in. These were spec'd for the L88s, ZL1 and LS7.
For any other cam manufacturer, better check with them.
For any other cam manufacturer, better check with them.
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
That's just gonna be a nasty race motor, have fun in traffic. Have they found a way to keep the valve out of the cylinder if a beehive spring breaks, I would never use a single spring 
