Join Date: Aug 2001
Location: san jose ca usa
Re: Olds 402 Swap
A few things about 1st gen f bodies, on pontiac firebirds from 67 to 69 the engine was mounted differently then on later 70-81 2nd gens. All poncho engines built after 70 have two sets of motor mount bolts for this reason, one set is for 69 and older cars, the other is for 70 and up. Your olds engine will not have properly located engine mount holes, you will have to fabricate your own set. Second the wiring will have to be modified, the starter, alternator and other misc wiring will have to be extended/modified as will the fuel pump, all this stuff is on the other side of the car. I also would be worried about the oil pan not clearing the rear stearing of a 1st gen f body, you might have to modify the oil pan to clear.
Alll in all, for the time and money it would take to swap in a 403 you could have one bad mofo of a chevy engine that would bolt right in.
70 Camaro, 355, th350, 4.10 posi.
74 Trans Am, 400, th400, 2.73 posi.