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Old 06-06-2008, 10:59 PM
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350 Chevy in a '73 TransAm

Yes it is a Trans Am mostly original, but I want to put a 350 Chevy in it because I have a running 350 chevy and no Pont engine for it. I need an adapter for the engine mounts. I have a ballhousing that fits my Muncie tranny, now my only problem left it how to mount engine since my chevy mounts wont fir the bird.

Any suggestions, I did a couple hourse of web serching and found this site.

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Old 06-07-2008, 12:06 AM
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You'll want to get some late 60's early 70's camaro or chevelle motor mount frame tabs to replace your pontiac motor engine mount frame tabs.
Some firebird sub frames may have the mount bolt holes already drilled for the chevy motor frame mount tabs, making it a bolt in deal. But of yours is not drilled install the motor , trans and drive shaft with the chev motor sitting on the chev frame tabs on the pontiac fire bird sub frame and then mark the bolt hole locations as required. make sure the motor is level left right and the trans tail is centered. The engine/trans will sit approx 1" to the passenger side normally in your 70's era Firebird.
Get the motor/trans square and level in the chassis and mark the frame tab bolt holes.
Lift the motor/trans assembly up and drill the chev frame tab bolt holes in the firebird sub frame cross member.
Does it sound like I did this deal before?

Had a 1970 Firebird Formula with a swapped in 454 BBC.

Keep the Pontiac motor frame tabs in stock for another day.
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Old 06-07-2008, 10:20 AM
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I would sell the chevy 350 and buy a Pontiac 400 or 455. It would be worth the extra effort to keep it Pontiac. Plus a 400 or 455 makes really nice torque.
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Old 06-09-2008, 10:04 PM
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All you need is the engine mounting system for a '73 Camaro w/350 engine. Actually, if you could find a 2nd-gen Camaro or '75-'79 Nova with the later-style clamshell-type mounting system and a small-block Chevy motor, the engine brackets and mounts should make it a bolt in job. Don't forget the bolts holding the brackets to the engine, and the through-bolts.

Except for the springs, which are going to make the car look like it lost 150# off the front end. This is even more noticeable if your rear springs have the typical F-/X-body sag.

The bolts that hold the mount to the subframe are hard to get to since the lower A-frame blocks access unless you have some kind of double-articulated wrench extender, an exercise in frustration if there ever was one. I'd grab the engine brackets from a yard, and get new store-bought mounts for that particular car. Take a pic of the mounts at the yard if you can, so you can match them to the store's parts. Sometimes hi-po engines got different mounts from grocery-getter-types.
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Old 06-10-2008, 01:58 AM
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Rear wheel Drive Chevy Frame Mount Chart

Rear wheel Drive Chevy Frame Mount Chart

http://www.geocities.com/pcwright77/files/framemnt.html
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Old 06-10-2008, 02:04 AM
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Quote:
Originally Posted by 454C10
I would sell the chevy 350 and buy a Pontiac 400 or 455. It would be worth the extra effort to keep it Pontiac. Plus a 400 or 455 makes really nice torque.
Thanks, 454C10! Just goes to show that some of you Chevy guys aren't so bad, no matter what the Ford and Mopar guys say.
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Old 06-10-2008, 02:54 AM
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SSSSSHHHH.........................you didn't hear it from me, but some of us actually even own an occasional Pontiac.
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Old 06-10-2008, 08:08 AM
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Yes, I'm a big fan of the pontiac 455's. Just add a little cam and it can do things a 350 could never do. This is especially true when using stock gears and converter. Even with stock exhaust and intake manifolds, a 455 with a mild cam will push a 73 trans am into the high 13's at 100+ mph with 3.08 gears. And get decent mpg.
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