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Hello all...
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Posted by: 68conv

I'm new here and hope to offer and receive advice from all you car lovers out there.

'68 Firebird convertible , solar red

Posted by: 68conv

More information about my car...I'm not sure what motor is in it. I'm trying to figure that out...it has a code of XS, the original owner said 400ci, but I was told it was a 350. It is automatic and has an Edelbrock Performer RPM intake with the Edelbrock 750 cfm carb. I recently replaced a freeze/expansion plug on it, which it has 6 (3 on each side) with a size of 1 15/16". Any help or advice on what engine this is would be greatly appreciated.

I was told by a mechanic that the transmission was a 400 turbo hydramatic, but not sure how reliable his information is.

Thanks...

Posted by: skeezix

Check the block casting numbers. This page will tell you what block you have;

http://www.teufert.net/pontiac/bloccast.htm

Also, here's a page to show the different bores and strokes.

http://www.teufert.net/pontiac/boresize.htm

Here's the website;

http://www.teufert.net/pontiac/page2.htm

If you have a turbo 400, they're a great transmisson that are built to take alot of torque.

Hope the info helps. Welcome to MMC.

Posted by: LadyLS1

Hi' Welcome'

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