Whats wrong with my setup?
Thread Starter
Launching!
Joined: Feb 2007
Posts: 263
Likes: 0
From: Phoenix,AZ
Whats wrong with my setup? ive got a 1981 el camino with a 260 horse GM crate 350, a small cam (dont know specs), edelbrock intake, holley 600 carb(tuned pretty rich, out of the box), headers, true duals. Its running through a TH350 with a shift kit and stock stall, stock 10 bolt rear. I ran a 16.2 at 85mph with a leaky edelbrock 650, but it doesnt feel much better with the holley.
Is it my stock stall, my stock rearend, the holley, or what thats making this thing so slow? the DA was about 3000 that night but i figure i should be busting at least low 15's with nearly 300 crank hp.
Is it my stock stall, my stock rearend, the holley, or what thats making this thing so slow? the DA was about 3000 that night but i figure i should be busting at least low 15's with nearly 300 crank hp.
without running the numbers on the rear, weight, stall, etc.
a crate 350 is notorious for having low compression, near 8.0:1 if not lower, which will be a fundamental problem. you do not have 300 crank hp, and you won't know what you have till you dyno it,
I think the main solution would be to upgrade cylinder heads,
at least with vortecs (will be the cheapest route) having 64cc combustion chambers which will get you over 9.0 on compression. And at that point, the crate cam would probably be ok but if you're going to the trouble and expense of new heads then it would be silly not to upgrade the cam while you're there.
http://www.chevyhiperformance.com/te...ild/index.html
http://www.chevyhiperformance.com/te..._ii/index.html
a crate 350 is notorious for having low compression, near 8.0:1 if not lower, which will be a fundamental problem. you do not have 300 crank hp, and you won't know what you have till you dyno it,
I think the main solution would be to upgrade cylinder heads,
at least with vortecs (will be the cheapest route) having 64cc combustion chambers which will get you over 9.0 on compression. And at that point, the crate cam would probably be ok but if you're going to the trouble and expense of new heads then it would be silly not to upgrade the cam while you're there.
http://www.chevyhiperformance.com/te...ild/index.html
http://www.chevyhiperformance.com/te..._ii/index.html
Last edited by 1 FMF; Jan 27, 2010 at 09:34 AM.
TECH Regular
Joined: Oct 2004
Posts: 411
Likes: 0
What is the timing and fuel pressure?
Make sure it has 5-7 psi fuel pressure and maybe 32 degrees total timing. Put new plugs in it, make some full throttle runs and pull them out, if they are black, take some jetting out of it.
Make sure it has 5-7 psi fuel pressure and maybe 32 degrees total timing. Put new plugs in it, make some full throttle runs and pull them out, if they are black, take some jetting out of it.
Thread Starter
Launching!
Joined: Feb 2007
Posts: 263
Likes: 0
From: Phoenix,AZ
i want a cheap fix, not heads or gears haha.. i think the 260 hp crate has 8.5 to 1 out of the box. the cam thats in it isnt what came in the crate motor, it was swapped out afterwards. i havent checked the timing because i dont have a timing light but i thought that might be one of the issues.. i cut a 2.3 60' with no wheelspin
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Thread Starter
Launching!
Joined: Feb 2007
Posts: 263
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From: Phoenix,AZ
the secondaries are opening, it just seems like theyre really late.. when they do it really wakes up.. like i said, the carbs outta the box, and im no good at tuning 4 barrels.
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10 Second Club
Joined: May 2009
Posts: 3,427
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From: over dere
is the carb new? if so it should have came with more secondary springs--- i believe the yellow one is the lightest. you can even pull the spring right out and try that too
Staging Lane
Joined: Nov 2009
Posts: 76
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From: Georgia
To bad we dont know what cam your running. May have too much for your compression. Does it have a lope at all?
Thread Starter
Launching!
Joined: Feb 2007
Posts: 263
Likes: 0
From: Phoenix,AZ