Quote:
Originally Posted by hotrodder68
Believe it or not they have been milled down so much that they measured 53cc before I put them on. I am not sure how much more they can be cut. Originally Iron gt40 heads are 62cc or so. Maybe they will need to be milled more though after overheating...
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You are describing these heads as GT-40's so I'm assuming that is what they are, not P's right? If they are OEM GT-40's then they have already been cut WAY too far to get 53cc out of them. The stock deck won't handle that and will crack, likely the overheating problem. GT-40's will take about 57-58cc's and live without power adders. Since the engine has been running really hot a few times I would expect that the heads may have cracked.
There are a bunch of SBF iron heads out there on the aftermarket that are very affordable. If you are being cost-concious then look at something like the WP Windsor JR. They can be cut to 53-54cc and maybe more.
