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rotorwrench · 12-02-2016, 06:32 PM

It might have been a home fabricated adapter where they didn't have bolt holes to attach. I might be wrong but the tin can sleeve engines may have had a small step around the top of the bore. They just pulled the sleeves and honed it for those special pistons. I think I would remove the tack welded adapter and find a bolt on one or just go back to the divers helmet. The 41 models were the last to have the divers helmet distributor.

12-02-2016, 06:32 PM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 18,018	Re: Cyl. bore question It might have been a home fabricated adapter where they didn't have bolt holes to attach. I might be wrong but the tin can sleeve engines may have had a small step around the top of the bore. They just pulled the sleeves and honed it for those special pistons. I think I would remove the tack welded adapter and find a bolt on one or just go back to the divers helmet. The 41 models were the last to have the divers helmet distributor.