Exhaust question....

Printable View

07-11-2009, 06:44 PM
Dave Severson

Exhaust question....

Ok, we're talking about my '82 'maro. Ran out of room under the car for a decent sized exhaust system for the car so it's going to be a set of outsiders with fenderwell headers..... (I like my cars low, btw)

The engine is a steel crank 6" rod 383 with flat top pistons, heads will be aluminum (not bought yet). Cam will be a mechanical roller with rev kit--no cam specs yet, got to get the rest of the pieces lined up first... 750 4 barrell carb on a single plain intake. RPM will be about 7500 max.

Question is, the outsiders will be 3 1/2" tubes with a muffler inside them (or at least a reasonable facsimilie of a muffler:LOL:). Wondering what size and length primary tubes to run, and whether a not I should make them a set of step headers??? Should it be 3 1/2" or 4" collectors, and how about a guess on the collector length, too???? I'm building the headers, so we're not stuck with something some manufacturer thinks should work....

Oh yeah, transmission is a 5 speed so no concerns on all that tranny and converter stuff.....I still like having 3 pedals....

Thanks for the help.
07-11-2009, 07:15 PM
pat mccarthy

well the primary is going to be what it takes to get from point A the engine to point B the out side of the fender well so around 36 if you lucky on the collector s i would use 3 1/2 start the step at 12 or so to the next tube 7/8 to 2 .what happen to the bbc:D we run bbc to 8000 with out rev kits ?
07-11-2009, 07:20 PM
Dave Severson

Quote:

Originally Posted by pat mccarthy

well the primary is going to be what it takes to get from point A the engine to point B the out side of the fender well so around 36 if you lucky on the collector s i would use 3 1/2 start the step at 12 or so to the next tube 7/8 to 2 .what happen to the bbc:D we run bbc to 8000 with out rev kits ?

I was given a complete short block 383:eek::eek::eek:, fresh and ready to go!!!!!!
07-11-2009, 07:27 PM
pat mccarthy

Quote:

Originally Posted by Dave Severson

I was given a complete short block 383:eek::eek::eek:, fresh and ready to go!!!!!!

boy you are lucky :3dSMILE: some one sure wants you to walk to the light .:D well sell it i have all the part s for a 556 dart big M billet cap block with new diamond pistons .crank .rods .you would have to use corn fuel in it or hi tests:D today is .the hell of a deal day she needs to go:D
07-11-2009, 07:31 PM
Dave Severson

Quote:

Originally Posted by pat mccarthy

boy you are lucky :3dSMILE: some one sure wants you to walk to the light .:D well sell it i have all the part s for a 556 dart big M billet cap block with new diamond pistons .crank .rods .you would have to use corn fuel in it or hi tests:D today is .the hell of a deal day she needs to go:D

hmmmm. Well, I could always build another chebbie, i guess!!!!!
07-11-2009, 08:09 PM
pat mccarthy

well billet steel cap big m 9.800 deck with arp main studs . diamond dome pistons 4.500 bore with total seal classic rings. H beam rods ARP bolts.4340 4.375 crank = 556 cid . king bearing s main and rods .dura-bond hp cam bearings:D short block at one hell of a deal . you can not buy the crank/ rods and the block for what i can sell it for:D
07-12-2009, 04:51 PM
Dave Severson

Quote:

Originally Posted by pat mccarthy

well billet steel cap big m 9.800 deck with arp main studs . diamond dome pistons 4.500 bore with total seal classic rings. H beam rods ARP bolts.4340 4.375 crank = 556 cid . king bearing s main and rods .dura-bond hp cam bearings:D short block at one hell of a deal . you can not buy the crank/ rods and the block for what i can sell it for:D

Sounds like a killer setup Pat!!!! Dare I even ask what something like that would sell for???? Seems like the real chebbie guys would be all over it!!!!!!
07-12-2009, 05:01 PM
Mike P

".....I could always build another chebbie, i guess!!!!!......"

OK WHO ARE YOU and WHERE's DAVE??????????????????:LOL:
07-12-2009, 05:06 PM
pat mccarthy

Quote:

Originally Posted by Mike P

".....I could always build another chebbie, i guess!!!!!......"

OK WHO ARE YOU and WHERE's DAVE??????????????????:LOL:

hell paint it dark blue call it what you want:D
07-12-2009, 05:09 PM
Dave Severson

Quote:

Originally Posted by pat mccarthy

hell paint it dark blue call it what you want:D

:LOL::LOL::LOL:For all the stock chebbie stuff in that engine, guess you could call it whatever you want!!!!!!
07-12-2009, 05:12 PM
pat mccarthy

Quote:

Originally Posted by Dave Severson

:LOL::LOL::LOL:For all the stock chebbie stuff in that engine, guess you could call it whatever you want!!!!!!

you got it.... that why my donovans are not chevys :D
07-12-2009, 05:18 PM
pat mccarthy

Quote:

Originally Posted by Dave Severson

Sounds like a killer setup Pat!!!! Dare I even ask what something like that would sell for???? Seems like the real chebbie guys would be all over it!!!!!!

well i did not want to sell this block was going to keep it for a back up for the chevy build a 556 blower engine i have pistons and bottom end parts to do it ..BUT . i can not eat it or pay bills with it sitting so she has to go . and i do not need anything bigger then the 548 blower engine thats in the chevy .it is to fast the way it is for a car thats not tub out .and i will never cut the trunk pan out .it to clean to cut