tom340
Well-Known Member
Like this topic hasnt been brought up before, LOL. Specifically, has anyone tried using them( factory manifolds) on a hi perf stroked smallblock street/strip application making between 400-500 hp. In your opinion-based on EXPERIENCE- do you feel it significantly hurt you with a solid "in the pants" feel? How about in the upper RPM range say over 4600 rpm and higher. I have them on the car now-new motor dyno'd at 430 peak HP but we had to use undersized 1 5/8" dented up shop headers since the manifolds would not fit the application. No ones fault, just how it happened. I can only hazard a guess it could potentially be hurting peak HP by 20 to as high as 50 hp. The recommended exhaust for 372" and up is 1 3/4" or 1 7/8" header. Im also dealing with a converter issue/ stall speed - Im thinking the stock manifolds are hurting my upper rpm pulling power as well. Im sure a lot of questions will be asked, to be certain YES everything else is fine, timing-compression etc. carb is tuned perfectly for current setup. Running tti 2 1/2" exhaust, H pipe and the best flowing Dynomax mufflers. The car has recieved high praise at some big shows already this year especially since the manifolds are in place and I disguised the engine to appear "stock" best we could. MoPar engine bays are a work of art. I may have to ruin the look a little next year if these things are killing me.. PS, no I aint selling them sorry