Re: who here races with exhaust manifolds?
 

OEM iron BBC manifolds will easily support 425+ HP, which is enough to take a well-sorted 3800 lb car well into the low 12's (depending on elevation, track/weather conditions, etc.)

Re: who here races with exhaust manifolds?
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mockingbird812</div><div class="ubbcode-body"><span style="font-style: italic">.... was interested to see what folks are running ET / MPH wise with stock or ported exhaust manifolds... anyone?</span>


'70 Chevelle LS6/M22/4.56 pure stock rules: 12.2 @ 108 mph </div></div>

M22..... yeah!

Re: who here races with exhaust manifolds?
 

w/ an M22 is talent for sure. That was done in 1983 by the then owner David Bunn and he set an IHRA World Record with those numbers. [img]<<GRAEMLIN_URL>>/laugh.gif[/img]

Re: who here races with exhaust manifolds?
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mockingbird812</div><div class="ubbcode-body">w/ an M22 is talent for sure. That was done in 1983 by the then owner David Bunn and he set an IHRA World Record with those numbers. [img]<<GRAEMLIN_URL>>/laugh.gif[/img] </div></div>

yeah, I used to race mine with a stick for years then gave in a swapped in a TH400 (eventually ran 11.30s at 121)... changed car a few years back missing the stick and now have the urge again to race but wanna keep it 4 speed / stock appearing.

Re: who here races with exhaust manifolds?
 

Last dyno session I saw was 35 HP between headers and exhaust manifolds. I think it is more if the carb was tuned for the headers. The cam is a 143 dimension spec cam. The more horsepower you make the more it hurts.

I run a 4 speed with the manifolds. Shift a 6000 to keep it real.