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

kwoods

Member
Does someone know the thickness of a styled G head? (F551R)

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

Pistons: http://www.external_link.com/mm5/merchant.mvc?Screen=PROD&Store_Code=oldjd4u&Product_Code=G791&Category_Code=73

My dad had the head deck around 20 years ago and can't remember by how much. I just measured it and it is 5.56" thick. I want to bore out the block and put these pistons in this winter so I'm trying to see if I'll have valve clearance issues before I get too carried away.
 

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