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Posted: 12/12/2018 10:06:54 AM EDT
[#1]
Chevy vs. Pontiac will require a few changes. Transmission bellhousing is different. Will require a different trans. since the bellhousing cannot be swapped. GM made a TH350 at one time that had a dual pattern bellhousing. Different motor mounts. Including frame to motor mount perches as well. Of course exhaust will need to be modified as well.
I had a '66 Tempest (same car) I dropped a 455 Olds into. It was a beast with this engine! Eventually went back to a Pontiac 400. Olds and Pontiac shared the same bellhousing pattern. Wiki info on GM bellhousing patterns EDIT: You're going to need a new transmission anyway with that old 6 cylinder. Personally, I'd either keep it all Iron Duke (Pontiac) or go LS. |
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Posted: 12/12/2018 10:12:25 AM EDT
[#2]
Quoted:
I want to get a new Engine for it does any one know if a long block Chevy would fit... right now the is a stock 6 cylinder looking for a big up grade... Pontiac 428 would be ideal though: All 428 engines were factory installed in large cars only. However, there were a few dealers that would install a 428 in a customers GTO or Firebird for higher power levels. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. |
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Posted: 12/12/2018 10:15:39 AM EDT
[#3]
Keep in mind you will have to source motor mounts, new transmission, new radiator, accessories (alternator, power steering pump, ac compressor etc). The good news is they should be fairly easy since you just need the parts for a Chevelle of the same vintage and the aftermarket has supported the A bodies pretty well.
FYI - if you have the 230 SOHC Pontiac engine - I'd suggest a rebuilt with some upgrades rather then just another SBC... |
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Posted: 12/12/2018 10:19:33 AM EDT
[#4]
Is it worthy of a restomod?
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Posted: 12/12/2018 10:21:29 AM EDT
[#5]
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Posted: 12/12/2018 10:22:58 AM EDT
[#6]
Pics of this new project ride???
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Posted: 12/12/2018 10:39:57 AM EDT
[#7]
Quote HistoryDo this. Get an overdrive auto trans or a 5 speed. Even a 5.3 makes decent enough power for a daily driver. Almost a dime a dozen these days.
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Posted: 12/12/2018 11:18:19 AM EDT
[#8]
Guys Thank you so much for the help will put up pics when done
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Posted: 12/12/2018 11:36:24 AM EDT
[#9]
Were working on a 67 GTO right now, however, we have decided to ditch the old and go with a supercharged 6.0L instead of the carbed engines.
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Posted: 12/12/2018 11:39:20 AM EDT
[#10]
You will also need different coil springs for the additional weight of the engine.
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Posted: 12/12/2018 12:17:16 PM EDT
[#11]
If it has the original engine and drive train consider packing them away. While you may not want them someday a future owner may. Also if it's an original 6 cylinder having the born with engine available may increase its value since most of those cars have already underwent the conversion to V8 making them more rare than a V8 car from the collector stand point.
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Posted: 12/12/2018 1:06:04 PM EDT
[#12]
Quote HistoryQuoted:
Guys Thank you so much for the help will put up pics when done You WILL however post pics of the build in progress 
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Posted: 12/12/2018 4:06:01 PM EDT
[#13]
Quote HistoryQuoted:
If it has the original engine and drive train consider packing them away. While you may not want them someday a future owner may. Also if it's an original 6 cylinder having the born with engine available may increase its value since most of those cars have already underwent the conversion to V8 making them more rare than a V8 car from the collector stand point. |
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Posted: 12/12/2018 4:17:23 PM EDT
[#14]
@roninbudo
Give in, LS swap the world. 
 
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Posted: 12/12/2018 7:59:29 PM EDT
[#15]
If you must put a Chevy in it, do an LS.
If you're just gonna do a hillbilly old 350 chevy swap, spend a few bucks and build a 400 Pontiac into a 455.  Attached File |
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Posted: 12/15/2018 4:10:23 PM EDT
[#16]
Quote HistoryQuoted: Um, no you will not. You WILL however post pics of the build in progress |
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Posted: 12/15/2018 9:38:02 PM EDT
[#17]
Here OP, I'll help spend your money.
https://butlerperformance.com/c-1234763-engines-blocks-engine-kits.html |
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Posted: 12/19/2018 12:41:34 AM EDT
[#18]
Is it the Sprint OHC? They are not your run of the mill inline six. Easy way to tell is a chrome air filter lid hiding a quadrajet.
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Posted: 12/19/2018 1:35:30 AM EDT
[#19]
LS all the things this shouldn't even be a question.
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Posted: 12/19/2018 1:57:33 AM EDT
[#20]
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Posted: 12/22/2018 2:25:06 PM EDT
[#21]
When I restored my 69 Firebird years ago I was all about keeping it Pontiac Powered. If I were to do it again today I would go with a modern fuel injected crate motor. Just much more cost effective and reliable and in most cases making much more power with a LOT less weight.
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