cam choice is very well affected because a log cant respond as fast as a header can. MY 226 cam cleaned up night and day from the manifold to the header style.

Yes, hot spots can cause cracking. Using a certain material is only going to prolong how long it takes to crack.

R

 

Thats why high HP race and drag cars run headers?

 

what hp do you count as high HP?

 

Rick I donot want this to be thread about one it better then the other. They both have a place in the turbo truck world. My twin kits use headers, and my single does not. Your old twin used those stockers, and your new one used headers.

 

Thats the point I am making. Not trying to prove one setup over the other, but I was under the impression from others that not much would change from a manifold to the header. But low and behold, the same setup on my truck and the same boost pressure bought me another 130hp. So go figure. The truck responds so much better and the power is nuts. There is something to be said for it.

R

 

Same cam, turbos, boost and everything? Only change was the manifolds to headers??? Are you driving this truck at these boost levels, and are the dyno numbers repeatable?

 

Even the same timing table and fuel levels.

I drive the truck everyday and lets just say I dont even want to use my second bost level like I used too because my low boost blows that away now. And yes, I ran the numbers on the dyno for all boost levels all day long. I thought it was odd, but it kept doing it.

R

 

Well damn, I'd better start building headers then,

 

Lets just say you better have your pocket book open.

I put an easy 2K more just doing the headers.

R

 

my $.02 on single vs twins... twins look bad but cost more. in medium hp set ups a single is easier to package. in very high hp set ups i think twins are easier to package due to the very large down pipe you would need for 1000+hp.

i did some presure ratio tests with my truck. we also did some on the fairmont. no great answers but a few numbers you can look at.

here is a ar swap on the fairmont that has a little exhaust presure data https://www.performancetrucks.net/fo...ighlight=.68ar

here is a cam swap thread on the fairmont that has a little exhaust presure data https://www.performancetrucks.net/fo...xhaust+presure

here is a thread with some info from my truck https://ls1tech.com/forums/showthread.php?t=264718

got company, will add more later.