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Nova4301 · 11-23-2009, 01:01 PM

I found a set of heads that match the casting number I need except it has an x at the end of it. Is this still a legal head? What does the x mean?

NHRA/GM allowable casting numbers:

3998991 or 3986339

found a set with 3986339x

thanks,

11-23-2009, 01:01 PM	#1
Nova4301 Junior Member Join Date: Sep 2008 Location: Moore, OK Posts: 54 Likes: 0 Liked 0 Times in 0 Posts	question on matching head numbers I found a set of heads that match the casting number I need except it has an x at the end of it. Is this still a legal head? What does the x mean? NHRA/GM allowable casting numbers: 3998991 or 3986339 found a set with 3986339x thanks, __________________ Tim Wilson HR/SST 4301