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Thread: GM Crate motor cam selection
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05-30-2007 #1
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GM Crate motor cam selection
I am helping my grandpa put a set of double hump heads on a gm crate motor. This is the crate motor http://store.summitracing.com/partde...3&autoview=sku
He wants to change the cam also. He is not looking for tons of power. He mostly just wants a lopey idle so that it sounds good.
Thanks for the help
68 Camaro
LS2 6speed
Complete Hotchkis front and rear suspension, Global west SFC, 3rd gen steering box, C5 front rear discs w/ 4th gen booster and MC. 8.5" posi rearend with 30 Spline 12 bolt axles.
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05-30-2007 #2
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Comp Cams XE268 ??
It would work well with a compression ratio between 9.0:1 to 9.8:1 and you can run it on 87 octane.
05-30-2007 #3
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The Isky 201271/281 is a good choice
221/232@050
465/485 lift
108 Lobe Seperation
It will make power from about 1000-6000RPM with a nice choppy idle without ruining driveability.1971 Camaro, 383 stroker ~500HP,M21 Trans with lightened flywheel. All Sorts of Auto-x Goodness in the Suspension. 12" Brakes ->SOLD
But ask me about my 2004 STi Auto-x car...
Just call me Brett
05-31-2007 #4
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Maybe one ofthe new Comp Thumper series ?
Supposed to sound awesome and not kill the idle too bad.Jeff Tate
U.S.A.
"The best thing about participating in these events is that you get to hang out with a group of intelligent like minded people who live to achieve things in their lives. You won't find a lazy, mean, or dumb bone in their bodies." Bret Voelkel, RideTech
06-01-2007 #5
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One of the Comp Thumpr cams or a Lunati Voodoo cam evenDont let him forget with the double humps its gonna need premium unless you get a cam with atleas a 110 or even a 108 cl too much ceter line and it will over peak the cylinder pressure and be detonation sensitive, i had this ina 355 with 991 truck heads a steel shim gasket and pistons down in the hole 018.
You can also spring for a set 051 thick headgaskets(ithink they are actaully GM gaaskets too Ill try to find a number)to cut compression.
double humps with flat tops make a tad over 10 to 1 unless they have had a lot of unshrouding around the valves(take chambers out to almost the edge of the headgasket sealring).
Good Luck
Lee
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