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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Always a good topic of discussion with cylinder heads. What makes more power if you could only have 1 of the following? Compression? (closed chambers), larger valves, or larger ports?