12" F 1 Midsection!!!!

[ALLISON7710]

AN OLDER STYLE WORM GEAR IN AND OUT 12" ABOUT LATE 80S EARLY 90S. WHAT EXHAUST ADAPTER WITH A NEW TUNNER WILL FIT IN THIS HOUSING. AND IS THERE TWO PIECES OR ONLY ONE. MEANING IS THERE A EXHAUST DIVIDER W/TUNER ATTACHED AND ALSO A SPACER (2ND PIECE) ABOUT 3/4" THICK? THANKS ERIC.

[Graham]

Eric - generally, the 12" tuner is a one piece unit, a spacer is not used.
Early style tuners have a wider exhaust hole in them, in a shape similar to an "L", the exhaust outlets in the engine block are the same shape.
A later style tuner will interchange without any problem.
Should a spacer (for what ever reason) be used, either on top of or below the tuner flange, powerhead mounting studs (of an appropriate length) will be required.

[Graham]

Eric - The S3000 Version consists of a two piece unit -

PLATE #848166 1 & DIFFUSER (TUNER) #849488 1.

[GT]

The spacer should only be needed if you were trying to run an early style speedmaster.

[ALLISON7710]

AN 89 MODEL. IT HAS THE WASHER INSETS FOR THE GEARCASE. MY QUESTION IS HOW DO I MAKE A 2.5 TUNNER WORK IN THIS MODEL MID? IT HAS SOME KIND OF A TUNER THAT IS KINDA LIKE A 2.5 RECTANGULAR TUNNER BUT HAS A SMAL DOGLEG OR CURV IN THE TOP OF IT. WANT IT TO BE STRAIGHT. THANKS GUYS FOR ALL THE REPLYS.

[ALLISON7710]

A SPACER. JUST WAS NOT SURE IF I NEEDED ONE:confused: I HAVE FIGURED OUT THAT I DONT.

[Brendan Power]

Call me I may have what you need:D :D :D