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Old 10-29-2009, 03:40 PM
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72 C20 Street/Strip project

I'm taking my original post from the "introduce yourself" forum and copying and pasting it here where it is more appropriate. Thanks.
I would love to run this truck on the track here and there, and depending on how things go, maybe do a little bracket racing. We have a track 40miles away. I have a one owner 1972 Chevy C20 with a fresh 454 >30 over running oval port 781's with valve work done to allow the 280 comp cam to work to its best potential. Flat top pistons running approx 9.5 to 9.75:1 compression. Performer intake, and freshly rebuilt 850 double pumper. Headers and dual Flowmaster 3" exhaust. It has the stock 12 bolt 4:11 rear end. I am in the process of installing a th400 tranny with a 2800+ stall. I am looking at installing the Caltracks brand traction system for less wheel hop. Open for options here too! I am flipping the axle, and have already takin out several load springs. Not much available for kits in the C20 for lowering the front suspension. May just do the old "heat the coil spring" trick. It needs to go about 1-2" lower max in the front. Would love to hear some tricks for making this a better street/strip truck!, or pointing me to a forum that may help. Thanks Guys.
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Old 11-09-2009, 09:05 AM
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Quote:
Originally Posted by justins72c20rat
I'm taking my original post from the "introduce yourself" forum and copying and pasting it here where it is more appropriate. Thanks.
I would love to run this truck on the track here and there, and depending on how things go, maybe do a little bracket racing. We have a track 40miles away. I have a one owner 1972 Chevy C20 with a fresh 454 >30 over running oval port 781's with valve work done to allow the 280 comp cam to work to its best potential. Flat top pistons running approx 9.5 to 9.75:1 compression. Performer intake, and freshly rebuilt 850 double pumper. Headers and dual Flowmaster 3" exhaust. It has the stock 12 bolt 4:11 rear end. I am in the process of installing a th400 tranny with a 2800+ stall. I am looking at installing the Caltracks brand traction system for less wheel hop. Open for options here too! I am flipping the axle, and have already takin out several load springs. Not much available for kits in the C20 for lowering the front suspension. May just do the old "heat the coil spring" trick. It needs to go about 1-2" lower max in the front. Would love to hear some tricks for making this a better street/strip truck!, or pointing me to a forum that may help. Thanks Guys.
What do you expect to get out of this combination??? From a drag race point of view the motor is pretty much stock. I'm sure it sounds real good with the 3" but probably doesn't help performance with this motor. Is the 12 bolt a posi-track? If not it isn't going to get out of the hole. THe TH400 is a very good tranny but heavy. 2800 stall is too low. 3500 would work better if you can get the thing to hook up. Pull the springs and cut 1/2 coil at a time until you get the desired height.
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Old 11-09-2009, 01:29 PM
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The cr of a 454+.030 with flat tops and #781 (typical 118cc) heads with a .038" gasket with stock deck clearance is 7.8:1

To get anywhere close to 9.5:1 with this motor and flat tops requires a much smaller 92cc combustion chamber or a dome piston and a thinner head gasket.

the performance is going to be soft with this low of a cr.
a blower would fix that.

these piston would get you 10:1
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Last edited by F-BIRD'88; 11-09-2009 at 01:39 PM.
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