blue by you

need some help from the gurus I have a 71 sb non air my passenger side exhaust manifold is cracked casting 3989036 and found one casting 3932465 which says from a 70 sb will it fit and work I would like the same number but they are hard to find.

Thanks

bj1k

According to the NCRS pocket guide your number 3989036 is for 1971 right hand 270 HP 350 engine . The one that you found should have the number "1" at the end ( 3932461 ) They used the number 3989036 on 70 , 71 , and 72 on the right side.

blue by you

my question is will it fit

Mick71

Yes, as long as the outlet diameter is the same. 2"

Driver side is different, though.

blue by you

mick, I just put one on the drivers side, the guy I got it from had both I only bought the one now I need the passenger side he said they came off the same engine. the casting number for the drivers side was the same