John Deere G head thickness and M&W piston dimensions?

kwoods

Member
Does someone know how thick the head for a styled G is? (F551R)

Also, what is the distance from the center of the wrist pin to the top of the piston on M&W high compression pistons? (.125" over)

Pistons: http://www.external_link.com/mm5/merchant.mvc?Screen=PROD&Store_Code=oldjd4u&Product_Code=G791&Category_Code=

I'm trying to see if I'm going to have valve clearance issues. My dad had the head decked probably 20 years ago but he doesn't remember by how much. The head measures 5.56" thick. I want to bore the block and put those pistons in but I'm afraid I may have clearance issues.
 

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