[Stan Weiss]

Originally Posted by Formulajones

Yeah Steve Brule has done that test a few times in the past on BBC's and found that the bigger ports actually don't hurt the low rpm torque like many are led to believe, least at WOT on the dyno anyway .

I went that direction on one of my own BBC's, with a small 454 using large 305cc AFR heads. General consensus is that these heads work best on 502-540ci engines, which is one reason I bought them with bigger plans later.

However they have proved to be just fine on the 454. Low speed light throttle drivability is very crisp and responsive. There is no lack of torque down low and nothing soggy about them putting around town. Which is one of the questions Richard didn't have an answer for on the dyno.

I can say, at least on mine, that it's absolutely not an issue at all.

I know that port cc's only tell some of the story and one needs to know port center line length also. But weren't the rectangle port heads Chevy put on the 396 ci 375 HP and 427 ci 425 HP right around that port volume / size?

Stan