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Re: 1940 Model B cylinder / piston options

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10-24-2013 11:51:10

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rileys list m&w style piston for 39 and 40 b's. yes a mid year block will bolt in but you also have to use newer head and water pipes. Mid year b's have a larger rod journal on crank so you must reuse orig rods. Beware with mid year block and m&w piston it will put piston right at top of block if not slightly higher. Lots of compression if hand start.

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10-25-2013 11:17:45

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 Re: 1940 Model B cylinder / piston options in reply to strokerb, 10-24-2013 11:51:10  
I haven't spoken to anybody at Riley's directly - but talked to one of the dealer's they list.

According to him - Riley's owns the machinery to make the 4 1/2 pistons, but stopped making them about 10 years ago. They have sold all their stock.

So - like me, you're out of luck unless you can find some used or old stock somewhere.

I guess it's either bore to 4 11/16 and deal with the associated issues there - or sleeve.

Guy I talked to recommended using the original pistons with larger rings (ie. 4.5 + .045) - machining the pistons to fit them... I'll have to talk to my machinist about that. I've never heard of anybody doing it, but who knows.

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