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Old 11-04-2003, 11:38 PM
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Question Need Help!!! 326 Swap with 350 Chevy Engine

Hello fellow hot rodders, I am new to this board but have been lurking it for a long time, anyways i was wondering will a 350 chevy engine slip into a 67 firebird? Also will a 350 tranny bolt onto the chevy block. Will I run into any problems trying to do this. Anxiously waiting for anyones help!


Thanks in advance!
Greg67
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Old 11-04-2003, 11:54 PM
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67 firebird is the same as a 67 camaro so chevy engine mounts for a camaro will work in your firebird u will need a chevy bolt pattern trans but everything else should bolkt right in!! good luck
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Old 11-05-2003, 12:05 AM
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That 326 weighs quite a bit more than the Chevy, so you might want to change the front springs. Exhaust of course is also different, but not hard to adapt. Motor mounts are different, as are the brackets that connect the mounts to the frame. Don't trash the Pontiac brackets, as they don't exactly grow on trees any more, and there have been a couple of people on this board looking for some in the past few months.
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Old 11-05-2003, 12:08 AM
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the 350 trans that I have,will it work?This trans bolted on the 326 block.More detailed instructions please.


p.s. thanks for your help.
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Old 11-05-2003, 12:11 AM
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your trans off the pontiac engine will not bolt up to the chevy engine chevy has its own trans to engine bolt pattern so u will need to find a chevy turbo 350 trans what u have is called a BOP"buick olds pontiac" bolt pattern trans so yes u will need to swap transissions also
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Old 11-05-2003, 12:15 AM
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The Pontiac engine has a "B-O-P" (Buick-Olds-Pontiac) bolt pattern on the back where the trans. goes. Chevy uses a different pattern. Adapter plates are available, but it's probably better to use a Chevy-pattern trans. Watch out for tailshaft housing length differences. T-350's had 6" (like yours), 9", & 12". If you know a transmission guy, he may be willing to find you a Chevy case & swap your guts in for a few bucks.
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Old 11-05-2003, 12:19 AM
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They sell adapter plates to adapt the bellhousings for your conversion in the PAW (Performance Automotive Warehouse) catalog. Check your bellhousing first because some of them had dual patterns.

Before you go with the 350 Chevy you should consider a Pontiac 400. They have the best 0-60 times in stock form. I almost put one in my '73 Camaro, but I found a good 400 SBC core last minute and went with that.
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Old 11-05-2003, 12:24 AM
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The reason I was looking in to chevy block is my 326 block has three cracks on it .Its probably a better to stay with the 326.


p.s. whats the hp of the 350 chevy.
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Old 11-05-2003, 12:39 AM
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I wouldn't ever use a Pontiace 326 or 350. They're just too much weight for the cubes. I would to one of three things. Either get a roller cammed Chevy 350, a SBC 400, or a Pontiac 400.

The 350 hp figures are going to change engine to engine. How would you build it?
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Old 11-05-2003, 09:01 PM
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Pontiac 326-455's are identical in external dimensions, so a 455 will bolt in where the 350 lives, as will a 400 if it has the old motor mount bolt pattern on the block. The old motor mount pattern has two bolts on the block (you should have this). The newer one uses 3 bolts. 455's usually have all 5 holes. My '76 400 has all 5, but many do not. If you go this route, beware that the flywheel-to-crank bolt patterns vary through the years on Pontiacs. There is a small difference in intake-to-head interface (at the heat-riser passage) starting in '72, but it's not a big problem.
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Old 11-05-2003, 11:23 PM
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Found the numbers on the head ,dont exactily know what they mean??I crossed the #'s and the valve sizes are the same. 1967 block size 326 valves is 1.917-1923" and exh.1.632-1.643" which is the same as 1967 400 ??
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Old 11-06-2003, 12:18 AM
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1967 GTO, GP, and 428 engines had larger 2.11 intake and 1.77 exhaust valves.
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Old 11-06-2003, 03:35 AM
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put a 455 olds back in !
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Old 11-06-2003, 11:44 AM
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...back in?
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