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Re: L31 engine swap questions
With the block and heads being different colors and the heads having the GM LS valve springs, it's hard to say what is inside. It may very well be a stock L31 or it may not. If it is a stock L31, that cam does not have a fuel pump lobe. But since the valve springs have been upgraded, I would guess that the cam is not a L31 cam. The heads have obviously been off at some point. I would also check the distributor gear for wear.
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