Thread: head flow velocity and port size

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how much does the slower head flow velocity of a 230cc port hurt the torque/hp over a smaller port 190cc head with a street grind cam? motor is a 400CI with a cam in the 230@.050 and .550 lift range. would a 230cc port rev slower and thus make your ET's slower?

i've got another question. one set of heads flow 260@ .550 lift with a 190cc port and the other heads flow 290@ .550 lift with 230cc port. with the cam above the smaller port head 190cc 260@ .550 lift would make more power right because of port velocity? since the small cam can only allow so much air into the chamber. i would take it that the cam would be the bottle neck?

anyone willing to fill me in on how this works. i've done google search for a few days on it.

a airgap would make more velocity in the intake but it would slow down when it hits the 230cc heads, right?

PS the motor is a 401 with 10.5 compression.

i've got a 401 to build for the wifes car. i just wasn't sure if i wanted to use the indy heads 230cc ports or the edelbrock heads 190cc ports. since i would like to use a 2500 stall and highway gears in her car. i can get a deal on a set if indy heads that just around 200 bucks more than the edelbrocks.

i think i'll use a 3.50 gear, 2800 stall, torker, indy heads, 224/232@.050 543/564 lift hyd roller, 10.5to1 compression