frame mounts big block verses small block - Team Camaro Tech
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post #1 of 5 (permalink) Old Aug 4th, 00, 06:38 PM Thread Starter
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Join Date: Feb 2000
Location: Little Rock,Arkansas
Posts: 30

Can some one help me? Tonight I was dropping the engine in my 69,everthing was fine the drivers side motor mount bolt went in,no problem,went to the passenger side and the hole was approx.1 1/2 inches off.I have another set of frame mounts that are supposed to be for a big block that appear to be close(just sitting them on the frame)I don't know if I got them mixed up or what but was wondering if anyone can help identify which are which.By the way I am putting a small block in the car. thanks
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post #2 of 5 (permalink) Old Aug 4th, 00, 06:44 PM
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Join Date: Dec 1999
Location: Manti, Utah. USA
Posts: 51

I had to change mounts in my car "I went for a straight 6 to a 396 BB". The mounts do look different but would be tough to describe, if you have a classic Ind. or similar mag. they will have pictures on the mounts so you can tell the difference.
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post #3 of 5 (permalink) Old Aug 4th, 00, 07:06 PM
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Join Date: Jul 2000
Location: Louisville,KY
Posts: 159

The big block mounts are lower to the subframe on both sides so that the engine valve covers will clear the wiper motor.On ebay their are a pair listed and they have a very good picture of both.I think he even put the part numbers left should be (#3980941) and right I think ends with a (999) or (998) or somthing like that but be careful it almost sounds like you have two mismatch mounts because i think it should still bolt up even with small block mounts.
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post #4 of 5 (permalink) Old Aug 5th, 00, 06:59 AM
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Join Date: Oct 1999
Location: RI
Posts: 2,854

I think the big block mounts offset the motor to the pass side slightly for more clearence between the dr. side exhaust manifold and the steering box. There is also a BB trans crossmember and a SB trans crossmember that do not interchange. I am not positive because I have read conflicting info on this in the different Camaro books.
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post #5 of 5 (permalink) Old Aug 7th, 00, 04:46 PM
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Join Date: Dec 1999
Location: Rutledge, Tn.
Posts: 610

Hey I have a 67 that i changed from a small block to a big block! I changed the frame mounts to big block frame mounts & have very little clearance on the drivers side between the factory cast iron exhaust manifold & the steering sector (1/2 to 3/4 inch) & I have to remove the wiper motor to remove the valve cover & I can't run a full size air filter element. A friend is running a 68 with small block frame mounts & he can run tall valve covers with out hitting the wiper motor the only difference is that he runs solid motor mounts & I run rubber mounts.

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