Did the fireball come out of the carb? If so, your timing is off.
In 1976, Chevy did put 454s in 1/2 ton trucks and suburbans (454 began in 1973), just not 4x4s. Last year for a 454 in a car was 1974, so your engine is likely the original to the suburban. I remember back in the early 80s I swapped in a 454 into my 1978 3/4 ton 4x4, and it fit like it belonged there, (because they did). I did not have any fuel pump clearance problems...my thinking is that perhaps your motor mounts are shot, or the motor mount brackets that bolt to the block are the incorrect ones (not tall enough). The fuel pump you replaced yours with shouldn't be the problem, especially if its pumping gas. I would work out the other "bugs" you seem to have; as I don't think you have a fuel devliery probelm, but perhaps a timing issue. Good luck.
Last edited by ken458; 11/21/11.
