Bought a set of these to put on my 390:

http://www.summitracing.com/parts/bi...view/make/ford

Anyone ever use these? Are they good/bad? One concern is the 2-piece design. Any problems with leaks, etc?

XE262H cam
9.25:1 compression
Performer intake
Edelbrock 1406.
Dual 3-inch pipes
Flowmaster mufflers.

 

I prefer a 3/8" flange over the 5/16. Less chance of exhaust leakage. 7/16" would be even better.