Anything W5 and below was pretty much designed for stock stroke, or at most, a 3.79 arm.
The advent of 4 inch plus arms left such stuff wheezing in serious even bracket level builds on the big end of the track, especially non offset stuff like eddies, Trick flows, etc
302 based motors come with heads that have smaller ports than a 318. This example is really just about useless to any of us...and they went over the factory designed port volume by ...oh 55+cc!?
They basically went from changing to an ideal performance head from stock..to a head that belongs on a 351 or 400cid.
That is called purposeful blundering for the sake of the argument to make a point that's really tired and common knowledge.
the bigger head was down in the mid-range but you're right might not have shown a difference at the track...who knows, might be just an efficiency issue.Obviously there was no need going bigger than the 190 cc heads didn't really gain but on the dyno didn't really lose, don't think it was meant to be super scientific just he we have these heads and and short block lets see what happens. Lots of his dyno runs are from years ago and he just try's sometimes to see what different conclusions he can come up with the data. But to It does show ya the 190 cc where the best fit for the 302 and probably the strongest runner but I don't think the other two would of been slugs.
Which of these seems the most wrong?....
1. 408 mopar stroker with 170 cc. Rpm heads
2. 302 Ford with 225 cc. Cnc ported heads
3. 396 Chevy (big block) with 316 cc. heads, stock, that flow 325 cfm.
4. 440 mopar with stock heads that flow around 220cfm, if they are pretty good ones (215 cc.? 235cc.?)
Back in the day, with my stock headed, stock blocked, stock cranked, stock rodded 440 I put an awful lot of guys on the trailer who had BB Chevy's with big old intake ports.
Big thing i take away from this demo is people want to say too big of a head kills low end power when in all actuality most of the power difference is less than 10hp across the pull, up until the point where the larger head pulls away in the upper rpms. Youll be hard pressed to find someone who can tell a 10hp difference by the seat of their pants. (Read 90% of the people on this board, myself included)