High compression street cam??
Thread Starter
Teching In
Joined: Jul 2009
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From: Kershaw, SC
High compression street cam?? I’m need a cam and rockers to complete my build. Well to complete this portion of it. I have a 99 Z28 M6 with stock bottom end. I have a set of LME stage 3 243 heads milled down to 58cc, headers, full 3” exhaust, 75-150 wet shot of N2O, 38 lb injectors, and Volant intake. Literally everything else is stock. I'm looking for something that is very streetable, although its not my DD, thats were it will spend most of its time. I know there's ton's of cam threads out there but I'd like to here peoples opions about cams for this setup.
Thanks in advance for your input
Thanks in advance for your input
TECH Senior Member
Joined: Feb 2009
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stage 3 heads mite have too big valves for a ls1 bore.the valves are close to the cylinder wall ,hurting flow.don't do the 228 cam 110 lsa,too much pressure.you have high static pressure you need a cam to make a safer dynamic pressure ,if you want to use pump gas.if you don't mind fly cutting the pistons there are a few cams to consider.also consider a custom cam.maybe look at a ms3 cam pkg too start.or look at a thunder racing cam pkg.EPS has a big cam you mite consider.
Thread Starter
Teching In
Joined: Jul 2009
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From: Kershaw, SC
mark: I just found a calculator and I got about the same. Do you know what the deck clearence is on a stock LS1.
gary: The heads came off an ASA ls6 and were not exactly sure if there stage 2 or 3 but they do have bigger then stock valves. The pistons in that motor had very small valve reliefs but they were dome pistons. I will check though. It was a GMPP ASA cam on a 109.
gary: The heads came off an ASA ls6 and were not exactly sure if there stage 2 or 3 but they do have bigger then stock valves. The pistons in that motor had very small valve reliefs but they were dome pistons. I will check though. It was a GMPP ASA cam on a 109.
TECH Addict
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From: PA/MD
Most of the ls1 blocks run around .005" out of the hole.
You probably need to fly cut your pistons to get valve clearance, and this will drop your compression down alittle.
FYI I'm running 12.56:1 scr with 8.25:1 sex on 93 pump gas with full timing and 0 knock
You probably need to fly cut your pistons to get valve clearance, and this will drop your compression down alittle.
FYI I'm running 12.56:1 scr with 8.25:1 sex on 93 pump gas with full timing and 0 knock
Thread Starter
Teching In
Joined: Jul 2009
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From: Kershaw, SC
Thanks mark. I'm talking AI right now to get a custom grind done. They're telling me that they can't guarantee me P2V clearence either. I actually came up with 11.26:1 as the compression with .052 gasket. the piston dome on the stock ls1 is 0, right?
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TECH Addict
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From: PA/MD
If you have the engine out and apart now id call a few local machine shops in your area and get prices to cut a small valve reliefs it the pistons....it shouldn't cost that much, and then you'll know you can slam the engine right back together when you get the cam....it took about 4.5 weeks to get mine back from the machine shop, but I did a lot of damage to it first lol
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Thread Starter
Teching In
Joined: Jul 2009
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From: Kershaw, SC
mark: Yeah that would be ideal, but the whole idea was to be able to do this without pulling the motor. If I'm going to have to pull it then I'm prob going to go with an after market rotating assembly.
180: Just want it streetable. If I wanted it to drive like stock I would have left it stock.
180: Just want it streetable. If I wanted it to drive like stock I would have left it stock.
TECH Addict
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From: PA/MD
Ok then look at something like a split duration 224/228 on a 110lsa and stay under .600" lift.
Just really look close at your PTV clearance and you might have to advance the cam afew degrees more to het your clearance...or you MIGHT just have your needed clearance....but check good
Just really look close at your PTV clearance and you might have to advance the cam afew degrees more to het your clearance...or you MIGHT just have your needed clearance....but check good
TECH Senior Member
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From: BFE
Ok then look at something like a split duration 224/228 on a 110lsa and stay under .600" lift.
Just really look close at your PTV clearance and you might have to advance the cam afew degrees more to het your clearance...or you MIGHT just have your needed clearance....but check good
Just really look close at your PTV clearance and you might have to advance the cam afew degrees more to het your clearance...or you MIGHT just have your needed clearance....but check good
Lift has little to do with PTV clearance. So max lift should be partialy determined by springs on heads and the head's ability to move air at that lift.
Also lobes will come into play for DCR purpose.
However, as mentionned above, I would flycut properly and run a 228ْ>230ْ range cam with 5>9ْ overlap.
