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Grape Vine - General Discussion Shop Talk - Bench Racing, No political or religious topics are allowed.

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Old 01-16-08, 07:23AM   #1
Zedo
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Default saviour for early Pontiac V8's- 287-317-347-370-389-421-adapt engine to modern trans!

http://www.transmissionadapters.com/early_pontiac.htm


they now make adapter kits to put a modern transmission on any 1955-64 Pontiac block

this is a real boon, because a lot of those early 389's would sit and rot, due to non-compatibility with TH350/400 trans- a shame, because they have thicker bores and can take .090"-.120" overbore- the junkyards were full of them

check out the crank hub adapter- this is a high quality kit !
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Old 01-16-08, 01:42PM   #2
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Thanks ZEDO !!! That 370 turbo combo will like this kit!
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Old 01-16-08, 05:44PM   #3
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I have a 370 engine too. Perhaps someday, I could use it for something now !

Tell me, how did you mount yours in the car ? The 1950's stuff had front motor mounts bolted to the lower timing cover bolts, and rear side mounts on the transmission !
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Old 01-16-08, 06:42PM   #4
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I am a long way from mounting it. I am going to use it in my pro street 61 bubbletop with a full chassis that will also have access to the rear seat. I designed the bars so that the inner panels cover most of them, including the bottom of the main hoop.
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Old 01-17-08, 02:30AM   #5
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Thanks for the post- nice looking kit.
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Old 02-16-09, 11:27PM   #6
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Zedo when I get around to finishing my 59 engine Im using a home fabricated mid plate/adapter and early 55-58 front center mount(plus fore/aft bracing) and poly trans mount. mounting in this fashion takes twisting loads out of block. I'll reinforce frame to control frame twist that mid plate alone doesnt take care of. The bell is strongest part of any block. the flexible mounts on each end wont allow the block itself to twist because there will be nothing for it to twist against. It should greatly reduce chances of splitting up the mains. I have also figured out how to make use of the reverse cooling pump/timing cover on modern heads. PontiacJack and I have speculated using a modern aluminum timing cover as they are drilled/tapped for early style front mount bracket. The more I look at that option the more I think it will work fine as it only acts as a pivot stop just like the trans tail, bulk of the weight will be on the mid plate. And if you add additional fore aft support to the mid plate I see no strength issue.

I was intending to put the 59 in my 84 GP and may still do that. However I'm playin with a Ford Torino for a bit yet. That Ford could get sold and a suitable rolling chassis Pontiac race car could replace it. The 84 is still mostly stock and seems too nice to gut and build a race car with.

The 59 389 could end up with forged crank and CV1 and 418+ cid. High rpm 900 hp range. I had a previous 59 block at 4.21 bore (.150 over) the present one sonod and appeared to be able to make 4.25 bore but I'm going to get it sonod elsewhere before I give that additional thought. I dont have the sheets but already at 4.12 bore and thinnest spot was .225 between 1+3 bore iirc. The guy that did it retired and closed shop didnt keep my file. Actually if I shoot for max power I should maybe only go 4.15 for good ring seal. Taff2 sonod a virgin 59 389 recently and had .25 inch minimum wall and .625 minimum deck. The early blocks were pre thinwall design and beefy.
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Old 02-18-09, 01:30PM   #7
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Wilcap also has a adapter kit for early Pontiac engines... and I believe its a little cheaper. I, however, haven't used the kit so I cant attest to it's quality.

http://www.wilcap.com/pontiac.html
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