exhaust size

[leavmeb]

What determines the size of the exhaust pipe on my 66 chevy with a 283
that I have added a 600 cfm edelbrock and a set of basic flowtech headers.
Is the 1.5 inch dual exhaust that i have now with flowmasters enough?

thanks

 

[Blue Bowtie]

1.5" is not big enough. I'd say atleast 2", probly 2 1/4" would be good.

 

[drabo]

1.5 with flomasters is a waste of money. Perfomance exhaust without performance pipes. 1.5 duals will work but don't expect much in the way of performance or MPG gains. 2 1/4 or 2 1/2 is about all you will need. Any larger would also be a waste of money. I'm running a 283 also with basic headers 2 1/2 pipes, 600cfm Performer and performer intake.

 

[leavmeb]

Thanks

A lot of conflicting advice out there, just thought I would ask someone with the same set up.

The truck had factory manifolds and 1.5 " with flowmaster mufflers, 2 bbl.


How much improvement can I expect?

Thanks again.