396...need help
Racer
Joined: May 2006
Posts: 286
Likes: 0
From: Alpine California
Originally Posted by corvette90
hi all!!
theres an article in a chevy magazine, where they built a 396 with about 200cc ported AFR heads, a Superram and the same cam i have..and they predicted to be something around 480hp and also 480tq
thank you
theres an article in a chevy magazine, where they built a 396 with about 200cc ported AFR heads, a Superram and the same cam i have..and they predicted to be something around 480hp and also 480tq
thank you
Just because they predicted it, doesn't mean they got it. Magazines are famous for "exagerating" hp and torque claims. I know this from personal experience. Many years ago (80's) we built a stout blown small block powered *****'s coupe the made 600 hp and could be driven anywhere you wanted to go in it. It was featured in several magazine at the time, and everytime a feature came out, the Hp claim's made by the magazines went up from what we had told them, I belive the max was around 900 Hp. It was just a big game of one upmanship!
Burning Brakes
Joined: Nov 2001
Posts: 1,241
Likes: 9
From: Houston TX
i don't think you necessarily have a component mismatch, i just think something is wrong. you have received plenty of suggestions here on things to check, mechanically and engine management-wise.
i'd add to that list by asking what the induction system looks like. is it a 4bbl TB directly on the intake? if so, how are you feeding it? or is it an elbow with a stock-style TB? if so, what does the elbow look like?
that intake manifold should do a great job, and would theoretically allow a smaller cam for the same power numbers. even with that cam i'd guess over 400rwhp.
-michael
i'd add to that list by asking what the induction system looks like. is it a 4bbl TB directly on the intake? if so, how are you feeding it? or is it an elbow with a stock-style TB? if so, what does the elbow look like?
that intake manifold should do a great job, and would theoretically allow a smaller cam for the same power numbers. even with that cam i'd guess over 400rwhp.
-michael
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
[QUOTE=Vetracr]As noted by others, you have mismatched components. You've also left out some important information. Did the dyno guys run the test with a wide band O2 sensor? Your AFR could have been way off. Were your valve springs new and matched to cam specs? Your peak torque rpm seems way low, valve float? With a single plane intake and 210cc "comp port?" runners your looking at a high rpm horsepower motor, not a mid range torquer. What is the motor to be used for, street or track? 113LSA is pretty wide for your intake and heads. 110LSA would be more like it if you want power. Even with the above, there is something wrong with your power and torque numbers, you should have gotten more with peak torque at a higher rpm. On the last motor I built I got 400 HP at 4800 rpm and 500 ft lbs at 4000 rpm out of a 355 that could pass CA smog. Too many unknowns to give you a specific answer. 
Hi
yes, AFR was ok, it was 12.5/1, springs was new and matched to cam, the engine was intended wostly for street use, as weekend warrior..
i have seen many streetable combinations, that usw the 210 heads and a single plane EFI...also ACCEL claims, this intake work best from 2000-6500rpm.....
greetings..
Hi
yes, AFR was ok, it was 12.5/1, springs was new and matched to cam, the engine was intended wostly for street use, as weekend warrior..
i have seen many streetable combinations, that usw the 210 heads and a single plane EFI...also ACCEL claims, this intake work best from 2000-6500rpm.....
greetings..
