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My car with 318 has single exhuast, pipes are 2.25 inch, muffler is 2 ft long, 1 ft wide, 4.5 inches high. Muffler is shot. I'm not looking for any sort of "performance" sound. I just want quiet. I have no idea if going to 2.5 inch pipes will give better flow, but might give different (or...

I have a 318 with 4027593 heads (with small holes under each exhaust port). I have these manifolds: Which I think are 3870387-4 but it's hard to read, the 3's could be 8's or vice versa: The back side covers the holes: The gaskets I used (back in 1987) were these: Now I know there's...