HP Exhaust manifolds

[Grip64]

Looking for some feedback here please fella's....

What times are you guy's getting at the strip running these manifolds

[b5blue]

Check out F.A.S.T. racing stuff for the best times! 

[firefighter3931]

Of course it depends on the build but some of the FAST guys are running low 10's through HP manifolds and exhaust. Make no mistake ; the manifolds are a cork and do limit horsepower. You need to be careful with cam selection....wide lobed profiles that reduce overlap and reversion seem to work much better with restrictive exhaust systems.



Ron

[Mike DC]

 
The difference with manifolds versus real headers is little or nothing when you're cruising around at 2000 rpm. 

But once you pass 3500 the difference starts rearing its head more and more.  It might be a 30+ hp difference by the time you're up at 5500-6000 rpm.   

 

[Lifsgrt]

I ran 13.049 @ 107mph with my 446 in Sept 2008 at Monster Mopar with stock HP manifolds and 3" TTI exhaust and Dynomax mufflers with 3:23 gears and a 727.  Picked up 2 mph and nearly .5 with the install of TTI headers. 

[mopar_nut_440_6]

The stroker I have ran a 11.43 with HP manifolds through 3 inch exhaust. 4100 lb 69 with auto and 3800 stall with 3:23 gears. When changed to headers it picked up a half second in the 1/8.

477 with 509 DC cam, old school stroker build

[Grip64]

The stroker I have ran a 11.43 with HP manifolds through 3 inch exhaust. 4100 lb 69 with auto and 3800 stall with 3:23 gears. When changed to headers it picked up a half second in the 1/8.

477 with 509 DC cam, old school stroker build

That's very impressive with those gears and all, i would like to here more about that build.... what heads were you using etc

[mopar_nut_440_6]

I did not build the engine but bought it back with my 68.

Here is what I know:

11.8 : 1 Compression
Forged Flat top pistons from a motor home application
906 heads with decent porting and port matching, stainless valves, Titanium Locks
Crane Gold Roller Rockers
5/8 stroke Hemi Billet crank-Not sure of manufacturer but it is extremely high quality
Stock rods beam polished, shot peened
Balanced, blueprinted
Holley Street Dominator Intake
MSD Pro Billet distributor
had a 950 Holley DP