Even with a turbo? I thought they were better than that, Blown.

 

I think it's quite a bit more then that, I've put down almost 500 with my 4.8 though stock manifolds and Wilderacing had to be pushing over 600 to go mid 11's with his.

 

Who let's these know-it-all rookies on these forum's anyways?? Where's a mod when you need one!
JFWY BC!

 

I thought I remembered some guys putting out alot more than that on turbo's, but I'm sure that is the case with N/A or blowers. trever1t I know is putting down some big numbers and great times with manifolds though. Still, it could be that headers would do better. I'm just wondering about my application with the rear mount 67.

 

I'm pretty sure Trever1t has long tubes and before those he had shorties. I think with turbo's it's a whole different thing than N/A or blowers. With a turbo they can't choke them down any more than the A/R housing would so it's almost a Moot subject to make the manifolds flow better if they are gonna be stopped up at the *** end of the exhaust anyways. Stock manifolds retain alot more heat than most brand name LT's which is good for turbo spool.

 

I think in order to break the 6 second barrier you will need a larger turbo. (76MM)
A forged 347 can do it but it will need some high boost with meth
Might want to consider some after market cylinder head castings with a thicker deck.

 

So the manifolds and exhaust will be fine then, but for how many cubes with a turbo?

 

Ted, your 67 will make alot more power than what you are making now. I think if your goal is just 6.9's then you are over thinking it. A forged 347 will get you there with the 67 in the rear. Do a 347, #317 6.0 heads with a good valve job. We will transfer your springs to those heads. We can slightly open up the manifolds if you want and have them coated. Turn up the boost and away you go.
Ted, one other thing to consider is that a 370 will only be a few hundred more.
We have made 650 with the 67 on a forged 347 with 6.0 heads. It was on this.

 

Thanks Billy, I guess either way I go, I won't be wrong.