3", 3 1/2" or 4" pipe to turbo?
355 sbc
forged bottom
230/244 hyd flat cam ( i know its not perfect, but we'll see how it does)
1.6 RRs
ported Gm 441's (284/237 @ .600")
currently pushing ~430-440 fwhp. I plan on a rear mount t70 turbo (.84 A/R) wrapping to about 6800-7000rpm. Estimating 10-12 psi. I'm going to go 3" from the headers to a Y, then to the turbo. Should i go 3, 3 1/2" or 4" to the turbo?
355 sbc
forged bottom
230/244 hyd flat cam ( i know its not perfect, but we'll see how it does)
1.6 RRs
ported Gm 441's (284/237 @ .600")
currently pushing ~430-440 fwhp. I plan on a rear mount t70 turbo (.84 A/R) wrapping to about 6800-7000rpm. Estimating 10-12 psi. I'm going to go 3" from the headers to a Y, then to the turbo. Should i go 3, 3 1/2" or 4" to the turbo?

