What size exhaust should I put on this 460. I have a mild came and will be getting better heads soon. I 2 1/2 ok, or should I go with 3in. It has 2 in. on it now.

1956 F100
460, C6, 9 in. rearend
91 GT
Stock, except flomasters
99 Chevy 1500 Z71

 

Well,the 2" system is too small for a modified 460,but 3" diameter might be a bit too much,even with the mods done to it.I would say go 2 1/2" so your 460 doesn't lose any low end response.

 

i just got my exhaust tonight. Got the 460 bored .010 over and k&n. got 3 inch off the manifolds with glass packs. no cats.........i did have 2 1/2 and i can definantly tell i went to 3 inch.....its way better.......the sound is awesome

 

Go with 3 inch.The new trucks even come with 3inch.

 

A freind of mine is installing a Banks Power Pack system on his 1990 F-250 460 4x4. It comes with headers, K&N filter, a huge muffler, and 3-1/2" pipe out the back. I'm a little confused, however, because it will be 3" going in the muffler, so I don't know what good the 3-1/2" outlet and tail pipe will do. E-mail me kmonette@idapac.com and I will update you on the performance. He pulled the heads last night to have a couple of broken exhaust studs lazered out. I'm sure it will be back together by the 1st of the week. He also is installing a Superchip at the same time.

 

If it has dual exhaust,and your 460 has a mild cam in it,go with 2 1/2" duals.If your '56 has a single exhaust,then 3" would be fine.I'd suggest dual 3" only if you had a more aggressive camshaft,aftermarket heads,and/or plan to add a supercharger to your 460.Dual 3" exhaust might sound good on your current 460,but you'll lose low end response(torque) for street cruising.Before I added the supercharger to my truck's EFI460,I had dual 3" exhaust put on.(I knew I was adding the blower&a better cam to the 460 soon after...)It seemed to lack the bottom end power,but it did have more mid range&top end power.Remember,in a heavy vehicle,like a truck,torque is your friend.Had I not planned on a supercharger&the better cam,I would've went with 2 1/2" duals,instead.

 

you are right the 3 inch does hurt the low end.........but it makes it all up in the mid, high end