90mm t/b is over kill, the biggest that your engine will probly require is maybe a 82mm t/b, off the t3, but even then a 75mm will give you the best all round response, with out killing bottom end torque, and still flows really well up high.
Eb....you are running a 75mm t/b on a five litre and not turning it as hard as I am,and I have a few more cubes as well !
As I said before,I am learning so I am open to discussion.
__________________
What ever I have will never be enough !
Fear is only Fear itself !
for the sake of asking a siilly question, as we are learning and sharing, wouldn't a set of twin 40's or similar be a more tractable set up than one big 90mm one?
I can understand a custom upper would need fabricating but in theory would the twin set up be best?
you can get a twin 58mm t/b setup off a f series, as far as you having more cubes that will help you out but it doesn't nessicerily mean that you need a t/b of that size, i've got a motor that has been built to see over 6500rpm, strokers wern't designed to do those sort of revs, more for low down torque. as i said before the bigger you go with the t/b the more bottom end you will loose, and thats no good on the street.
the setup that i'm running at the moment was originally off a mates inj 351c, and that thing was definetly no slouch. i beleive that you could probley get better divability from the t3's with a 75mm. 82mm would be the biggest i would go for your setup.
Yes, my engine too is built for 7000k+(scat forged crank,scat "h" beams,srp forged pistons and so on....) but my cam is only good for 6500(comp cams specs).........So the question remains.....????
The trickflow site says"R" manifold......
Large Cross-Section
with 12.2 in. Runner 2,500 to 7,250 rpm 75 mm 2.0 in. x 1.2 in. 2.38 in. x 1.38 in. 11.0 in. Black Powdercoated
Upper
TFS-51500005 Large Cross-Section
with 12.2 in. Runner 3,000 to 7,750 rpm 90 mm 2.0 in. x 1.2 in. 2.38 in. x 1.38 in. 11.0 in. Silver Powdercoated
Upper
With the extra 40 odd cubes that should bring the power range down a little(about 500rpm)
The question still remains????
__________________
What ever I have will never be enough !
Fear is only Fear itself !
a 90mm t/b is designed more for 351w strokers, no 302 would make use of a t/b that size. as far as manifolds are concerend the r series would be the ideal manifold for you, just get on without the egr port as you wont be required to run an egr
if you read the star of the post it said that the 90mm was designed more for 351w strokers, you could get away with using a 90mm on a 347 if you were to s/c it but otherwise dont go anywhere near that size.
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