Mismatched heads???
#1
Staging Lane
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Mismatched heads???
My buddy and I pulled apart the engine from his 1995 Formula and found the heads had two different casting numbers. One is 10128374 and the other is 10207643. We are going to have them resurfaced and mildly ported, but could this have caused problems with his formulas performance? And is it ok to go ahead and use the mismatched heads as long as we get them machined and port matched? Thanks guys.
#6
TECH Fanatic
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374 and 643 are the "good" casting numbers, whereas the later years, 96-97 got lighter, slightly different heads from the factory and these are much less ideal for porting.
OP, both of your heads are good!