Thread: My sbc and odd powerband

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i have asked around and have many mixed answers on this. just brain pickin seeing what you guys can come with. im new and reading the threads on this site you seem to know quite a bit,

I have a 77 sbc 350 in my rod that weighs close to 5500.

Completely stock bottom end. Bore everything.
It has a comp cam 220 duration and 5.26 lift
GM 202 heads
i believe they are stock rockers
built holley 650 double pumper done by Avanti performance. (they build a lot of circle track cheater carbs)
edelbrock rpm performer intake (not airgap)
accel dist. and supercoil

Backed with a th350 that has a b and M kit and new torque converter(believe its stock)
and a 4.10 rear

in neutral engine revs right up and idles back down very smooth.

When on the gas it takes off right off the line but then seems to sit down until around 3700 where it takes off again. not really bogging or loss of power but just an odd power range. it just doesnt have what i believe it should.

I have had people tell me i need a bigger intake due to the large cam and head that i am running. What do yall think about that set up and anyways you would improve it.

Not many cubes and torque for pulling 2 1/2 tons around!!!!

with .526 lift you arent' going to make any power until 3000 rpms or higher. A 3000 stall converter will fix it, but as stated above, you need more engine, less cam for 5500 lbs. A big block with a torque cam would be much better for your build. Your current motor would work great in a light car like a Nova with 4.11s and 3000 stall.

I see your from Brick-are you pushing the town around with you? What do you have that weighs that much anyway?

I think the 650 double pumper is your biggest problem, too much carb for a stock compression motor.

Originally Posted by mooneye777

I think the 650 double pumper is your biggest problem, too much carb for a stock compression motor.

Rule of thumb: Use vacuum secondaries with a converter that stalls up to 3000 rpm's. Double pumper with a converter that stalls at 3000 or higher.