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Author Topic:   manifolds or headers
Racer13T
Dirt Full Roller

Total posts: 46
posted October 19, 2003 09:25 PM  
can u get exhaust manifolds that flow as good as headers or at least close? if so what u get them off of? should i just stick with the headers i have, thanks in advance

jhon hollomon
Dirt Freak

Total posts: 468
posted October 19, 2003 09:46 PM  
You can find some good flowing manifolds but headers are way more economic and probably flow just as good or better than most manifolds.

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Just a little crazy!!!!!!

ruggs66
Dirt Maniac

Total posts: 193
posted October 19, 2003 09:47 PM  
if your rules allow headers why would you want to put on manifolds?

is this for a chevy engine?

some guys use the newer vortec truck manifolds..........but they are a tight fit to the firewall.

wizzard
Dirt Freak

Total posts: 306
posted October 20, 2003 11:50 AM  
thats what i was thinkin 66 header are cheap and work better than manifolds

Racer13T
Dirt Full Roller

Total posts: 46
posted October 20, 2003 12:31 PM  
with headers i cant get #8 spark plug out without taking them off. i have 355 chevy in 85 monte carlo. it just seems they are always in the way of something. they are supposed to be metric headers so i dunno, maybe the old car was just too bent up i wll try them in the new car i guess thanks for the info

Raz_900
Dirt Forum Champ
Total posts: 635
posted October 22, 2003 08:45 AM  
quote:
Originally posted by Racer13T:
with headers i cant get #8 spark plug out without taking them off. i have 355 chevy in 85 monte carlo. it just seems they are always in the way of something. they are supposed to be metric headers so i dunno, maybe the old car was just too bent up i wll try them in the new car i guess thanks for the info


I have Dynomax headers on 2 metric cars (82 and 86 Monte's) and we change plugs all the time without taking them off. It takes and offset box wrench on some of them, but after they break lose it's easy to spin them out with your fingers. PN 85121 ($100 from Summit Racing) for painted and 86121 ($236) for ceramic coated. 1 5/8" tube 3" collector. We bought the ceramic coated this year. The coating keeps the heat in the pipe when it's running and you can touch them in about half the time after shutting it off. Nice for working on it at the track and not burning the sh!t out of yourself.

Oh... and compared to typical manifolds, headers are worth about 15% power. Or about 40 HP on a 300 HP motor. Out track let's 350's running headers and a Edelbrock Performer intake. 400's have to do with standard GM intake and manifolds. Everyone runs 350s... the 400s get murdered (fast 1/2 mile mostly slick). The 'spec' 350's run the few 400s down on the straights like they're glued to the track.

Racer13T
Dirt Full Roller

Total posts: 46
posted October 23, 2003 07:20 PM  
thanks i will try to get a set of them from summit, thanks for all the replies

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