Re: BB engine frame mount numbers?
Originally Posted by The Camaro Guy
I drilled & slotted new transmission holes to the right 1 inch to carry the BB and 4 Speed trans. If you compare the 2 crossmembers that appears to be the only difference. I did this for both my BB conversions and all is fine.
It is actually 1/2" to the passenger side and 3/4" forward of the small blocks location. Your engine will sit crooked if you don't move it this distance and headers might not fit correctly etc. It might bolt up when done differently, but the transmission case can break if it is under stress too.
Make sure your G-force crossmember is offset... many aftermarket companies don't offset the mounting holes and use the same crossmember for both small and big blocks.
69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
Last edited by TJS69; Jun 18th, 13 at 10:36 AM.