Big block motor mount question. - Team Camaro Tech
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post #1 of 4 (permalink) Old Jan 20th, 01, 08:11 AM Thread Starter
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Join Date: Dec 2000
Location: running springs ca
Posts: 41

I have a stupid question but I am new and still green and somewhat confused. I hear that the big block frame mounts set the engine off to the right a little to clear the steering column. If this is the case then how will the engine line up properly with the transmission? Do I need a new transmission crossmember that will reposition the tranny? I have looked in the NPD catalog but they only have one crossmmber listed for big blocks and small blocks.
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post #2 of 4 (permalink) Old Jan 20th, 01, 09:34 AM
Join Date: Apr 2000
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Hey Dan, It's not a stupid question, this is how we all learn. I just did this to my car.
B/B motor mounts off set the engine 1" to the right, When you hook up your trans(T-400)the T-400 cross member will adjust for it.
The T400 piece is a bit different than the T-350 and power glides due to the length of the trans.
I only know about the automatics.

69 blue 502

69 Coupe LeMans-Blue
Frame-Off Resto, ZZ-502/502 Crate, A/C, Griffin Rad., March Serpintine Sys., 2800 Stall with Hughes T-400, Currie 9" with 370 Gears.

[This message has been edited by mobiletools (edited 01-20-2001).]
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post #3 of 4 (permalink) Old Jan 20th, 01, 04:49 PM
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I had small block frame mounts in my car with the big block when I got it. I put the BB mounts in when I had the frame out. I had to make a new hole in my crossmember for one hole and used one of the other ones. It makes a big difference in the clearance for the PS with headers. My new headers clear with no problems.

67 SS 427
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post #4 of 4 (permalink) Old Jan 21st, 01, 07:01 AM
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Join Date: May 2000
Location: Waukesha WI
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Chevy did use a different manual trans crossmember for big blocks but as Kent noted you can re-drill the sb crossmember.

Another important detail is bb frame brackets are different for 1969. They were re-designed for the interlocking motor mount. Unfortunately 67-68 motor mounts will fit and cause alignment problems. If you have 1969 frame brackets be sure to use 1969-up motor mounts.
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