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I believe most J heads had 1.88 int and most X heads had 2.02 int...I think...Lee

This is true...2.73 gear is not good for the hole...Sounds like timing is to slow though for it should not pop when u step on it...One of the best things u can do to a 318 is advance the cam 2-4 degrees, which will be 4-8 degree advance for the crank...This will give the 318 more bottom end with...