BORE SHROUDING TEST: 4.03" vs 3.91" Edelbrock RPM Heads Really Fit a 318? Project Mission Impossible

318willrun said

Back in the day, bolting X-heads on a 318 was one of the oldest tricks in the book. Every 318 loved them.

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Even though it killed a decent amount of cfm but it's not like most are taking advantage of all the cfm in the 1st place. A 250-450 hp+ sbm recipe's seems fairly the same to me whether it's a 318 or 340 or 360.