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6t6stang · 03-18-2002, 03:11 PM

Does anyone know the bolt circle diameter of the tri-y headers
that have a 3" collectors.

I believe it is 3-3/4 but I am not sure.
I am having a little bit of a problem finding them.
Any part#s would be appreciated. i have 66 coupe with a 302 automatic if that helps. Also have edelbrock performer heads
and Roller Rockers.

03-18-2002, 03:11 PM	#1
6t6stang Registered Member Join Date: Feb 2002 Location: Ct Posts: 8	Collector Gaskets Does anyone know the bolt circle diameter of the tri-y headers that have a 3" collectors. I believe it is 3-3/4 but I am not sure. I am having a little bit of a problem finding them. Any part#s would be appreciated. i have 66 coupe with a 302 automatic if that helps. Also have edelbrock performer heads and Roller Rockers.