I have an 85 Trans Am and i am swapping the bad lg4 305 for a L69 305HO. The L69 came out of an 85 monte carlo SS. I think the exhaust manifolds will swap with no problem, but the guy a bought it off of said that they are probably different bolt patterns. I haven't looked at them this winter because the motor is in storage. Does anyone know if the manifolds i have will work?

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1985 TransAm BLK/GLD Stock
1985 TransAm BLK/BLK
305HO (soon as it is put in) 5-speed, 3.27 posi, WS6, power everthing.
http://www.geocities.com/bullfrawgs

 

The only thing that might be trouble are the port sizes, and they are probably the same size.

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1989 Pontiac Firebird Formula LO3 Auto
-180 degree stat
-Hooker Cat-Back
*****Possible summer '01 mods*****
Open Element, Auburn Posi, Keyless Entry, wonder Bar off the IROC, 4th gen seats, T/A tail lights

1985 Camaro IROC-Z LB9 Auto
http://www.geocities.com/krt80/