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Old 10-09-2012, 07:48 PM   #1
slimj714
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Default 1950 pontiac 239 engine swap to a pontiac v8

Hey guys. I have a 1950 pontiac silver streak and i want to put a pontiac v8 to replace my 239. I want to keep my 3 on the tree tranny though. Is there a v8 that i can put straight in and will bolt up to my original tranny? Any help is appreciated. Thank you.
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Old 10-09-2012, 08:19 PM   #2
flypa38
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Default Re: 1950 pontiac 239 engine swap to a pontiac v8

Might wanna ask on the pontiac 1950s yahoo group. Those guys will know.
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Old 10-10-2012, 12:50 PM   #3
slimj714
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Default Re: 1950 pontiac 239 engine swap to a pontiac v8

Thanks for the tip
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Old 10-10-2012, 06:54 PM   #4
55chieftain
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Default Re: 1950 pontiac 239 engine swap to a pontiac v8

Your going to need an early engine 55-60 because the trans bolt pattern is specific to those years. Than a 55-57 bellhousing and clutch/flywheel set up . The trans itself was used from 37-55 , a light duty 5 bolt top cover. The stronger 6 bolt top cover 56-57 trans could be an option also but would require some work to fit. Finding a complete 55-57 engine/trans package would be your best bet. I don't think that trans is really going to like a bigger v-8 if your going to beat on it some.

The rear end gears may not be to friendy to a v-8 either. 55-56 auto cars used a 3:08 rear gear and would bolt into the 50 housing. You would really need a 55 center section because of the pinion yoke differance between the 2 years to match what you have now.
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Old 10-11-2012, 01:40 PM   #5
slimj714
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Default Re: 1950 pontiac 239 engine swap to a pontiac v8

So any v8 55-60 will work. Im not looking to race just a cruiser and Im changing the rear end gears also. I just want w reliable car i can drive cross country. With good gears in the back my trans should be ok right? I want to keep a pontiac in my pontiac.
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Old 10-11-2012, 05:42 PM   #6
Rocky
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Default Re: 1950 pontiac 239 engine swap to a pontiac v8

The 55-57 bellhousing is the only Pontiac V/8 bellhousing that will work on your 55-60 engine and interface with your 50 transmission. If you find your rear axle gearing is a little too low geared you can use the 3rd member from any 37-56 Pontiac. I've always used a 55-56 3.23 gear. You can swap 3rd members in an afternoon. If you use a 56 third member, you'll have to swap the 55 and earlier flange on to the third member...another super simple job. Just remember to use lberal amounts of blue loctite on the threads...they love to loosen up while driving.
My 41 had 3.90 gears and so did my 48...both got 3.23s and loved it.
BTW, did you see where I said 55-60 engine? Any newer engine and bellhousing will not fit your transmission. A 59 or 60 engine is 389 cu.in and will pull even the fattest old pontiac around with ease.
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Old 10-11-2012, 06:11 PM   #7
55 dude
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Default Re: 1950 pontiac 239 engine swap to a pontiac v8

do the pontiac rear end yokes your talking about have the same splines as a 9" ford rear?
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