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RBolig
12-16-2020 12:47:33
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I recently bought back my dad's 43 B that he sold many moons ago, and the guy I bought it from said he added a Heisler head and cast 50 pistons.
I still need to pull the valve cove to confirm Heisler is in fact in play.
My question is: why use a 50 piston? What's the benefit?
I am assuming it is just bore size, so why not just use a larger B piston?
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notyalc
12-20-2020 01:46:00
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33
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Probably still got the original pistons in....
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DGK
12-17-2020 06:44:02
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33
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I have any late model B or. 50 power block with pistons but block needs sleeved. Would sell cheap. PM me if interested. Thanks DOUG
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buickanddeere
12-16-2020 19:42:43
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33
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Are those LP 50 pistons for more compression ?
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Loosehandle
12-16-2020 13:48:49
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33
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There was a time when oversized pistons were NA for 4.5" B. Not sure about now,I have one that was sleeved.
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Randy G
12-16-2020 13:45:53
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33
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I believe the 50 pistons also used rod insert bearings and the late B did not
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WTW
12-16-2020 13:17:15
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 12:47:33
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The 1943 B would of had 4.5 inch bore / pistons. The late B gas and 50 both had same larger 4 11/16" bore pistons. Only difference between the late B and 50 pistons was the 50 used a narrower / thinner piston ring. The later piston not only larger in diameter it was taller both raising compression. If you post a picture of the upper corner of cylinder head where valve cover meets head I can tell you if you have a Heisler head or not with out removing valve cover. The two alteration should raise compression between 8 and 9 to 1. DW
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RBolig
12-16-2020 14:12:47
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Re: B with 50 pistons in reply to WTW, 12-16-2020 13:17:15
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DW, thanks for the reply. Here are two images of the head. 
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WTW
12-16-2020 15:56:01
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 14:12:47
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This head in photo is not a Heisler. This head appears to be late model Stock B head. Sorry, DW
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RBolig
12-16-2020 19:46:24
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Re: B with 50 pistons in reply to WTW, 12-16-2020 15:56:01
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Thanks for getting back to me. If I were to consider a stock-head swap, is there one PN that is a better starting point than another?
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WTW
12-17-2020 07:52:41
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 19:46:24
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Mike said it all, no real gain between the later heads just a few casting changes. DW
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Mike M
12-17-2020 05:06:14
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Re: B with 50 pistons in reply to RBolig, 12-16-2020 19:46:24
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The B cyl heads were all basically the same from 1942 ? and all the way to the end of production. I think there were 3 different casting numbers. The latest versions did away with the push rod tubes and had a different oil return passage that requires the matching thick cast washer on the center stud that feeds oil pressure up to the rocker arms.
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