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General Discussion / Re: 1.94 or 2.02 over the counter heads is there a???
« on: May 01, 2008, 09:00:51 PM »3991492 with casting date of K30 1... 64cc Straight plugs - press-in studs - accessory holes - and in the middle of the head there is a GM 56 - not sure what that means... They originally came with 2.02s
Just trying to confirm... Did all the 3991492 heads after 1970 come with 2.02s? Also, what were the performance differences between these service replacements and the stock 302 heads? Any improvement?