Manifold Learning - Sept. Article

and just as a side note,i have an article in another publication where they build a 383,using the AFR 195'S,10-1 compression,Comp hydraulic roller (242 intake,248 exhaust .540,562") air gap intake, and 850 Mighty Demon,made 550 hp and 515 ft lbs of torque.Performer Rpm Air Gaps work.  

You know how it's all about the combo? I worked with a builder to put together a 427 sbc that went 630hp/595ftlbs @ 6200/5000 on the engine dyno (w/ electric water pump). I copied almost everything, except AFR 210 eliminators (v old fully CNC version of AFR 210s), a couple more degrees of exhaust duration @ 0.050 and a little more exhaust lift, 112 lsa (v 110), and an RPM Air Gap (v a Vic Jr). I should've had my combo dyno'd but didn't. It's about 3mph/.3sec slower in a 300lbs heavier car with a crappier driver (me in my chevelle vs my bro in his camaro). I always wonder if it's me, the extra couple degrees lsa, or the intake that covers the difference (but it might just be weight).

Loved the intake test. CHP is kicking butt. I'm at the edge of my (toilet) seat waiting to see if you find where the RPM AG can't keep up.

Henry - If you'd help with the work, I'd do the intake swap at Bradenton (FL) with you to get some before/after times (should be all over the 11s w/o using spray). If it's slower with a big single, you'd have to help me put the AG back on.    

i think CHP should kill 2 birds with 1 stone...build a high comp 406-421 to test the single planes,and use a set of the new AFR 210 Eliminators,which i havnt seen a test on as of yet..,what do u boyz think???????  

That sounds like a Grand Idea to me... I have been saying more 415-421's Less 383's for some time now and am thinking of Buying the AFR 210 Eliminators for my 408 Woohoo  

this post is over a year old  

maybe a year old,but there are peeps still reading it.....  

Yeah.... What he Said!  

I'm still reading this thread, too. Seriously, it's filled with solid ideas and great feedback. For what it's worth, I'm already in the process of putting together a max effort 400ci+ mill to move forward with additional manifold testing, including the latest batch of big port small-block cylinder heads.  

thx henry,cant wait to see the results!  

Awesome... Can't wait!  

The power and torque numbers the RPM Air Gap intake shows on a dyno makes it look better than it really is. If you could read torque off idle to 2500rpm you would see a dramatic decrease in torque when compared to a performer or Street Dominator. I have a 350 w/186double humps, Lunati Voodoo 268/276/.489"/.504" cam, roller rockers, headers, Eddy 650 Avs carb, Accel billet distributor, Muncie M22, 3.36 rear gear, and at the time air gap intake all in a 3300 lbs 69 camaro that serves as my daily driver year round. I went all over the place with timing, metering rod springs, accelerator pump settings, and adjusting valve lash to figure out why the engine had no guts under 2000 rpm. If you didn't rev it to at least 2000 rpm letting out the clutch it would pop through the carb, act very weak and usually stall. So I figured the long runners of the air gap must be the root cause of all of my problems. So I swapped to a performer and now it runs perfect! Loads of off idle torque with no popping and I sold the intake and never looked back. Not to mention the Air Gap lacks an exhaust crossover which would make cold start ups in fall and Winter months horrible. I initially bought the Air Gap for the great hp and tq numbers it put out, but now I've learned the hard way you can't truly read how good an intake is by the power numbers it puts out on a dyno. Sorry for the long post but I just want people to take into account that runner length of an intake can make a huge difference depending on your application.  

Why not just use a Performer RPM instead of a Performer?  

The performer I have is factory polished (21011)and I found it for $30 so it was really hard to pass up. I figure there is minimual power difference between a performer and RPM.  

I agree. I'm running a Performer on my 406 because it was free and being in a heavy car it couldnt hurt either