Picture of 340/360 head porting....Mistakes?

How much porting you “need” depends on the goals, and also what you can live with in terms of how rowdy the motor is.

The heads really don’t need to be anything too special if you’re trying to make, say.......... 475-525hp on a 408-416 stroker.

Get them into the 250cfm range, and not fall off a cliff at .550-.600 lift......and as long as the planned package can work with a pretty healthy cam........ it’s no problem.

It’s the smaller hyd or hyd roller cam, not much stall/gear, OD, power brakes, a/c type builds that are harder to make that kind of power..... without resorting to “better” heads.