ul-ss

I'm looking to build 408 6.0 iron block soon and want to put a procharger on it down the road i was wondering what kind of power I could expect from a tsp setup something like the prc 237cc heads and whichever cam would be the best. Do the tsp heads flow enough? Should I go with trick flow or afr instead?

6D9 Matt

You are going to get all kinds of answers, everyone has a different opinion. Use the search and check out some of the results people have come up with. Im a fan of the TFS/AFR heads.

yelo04goat

iTrader: (11)

have been looking at the TSP heads also .. they look like great heads and flow close to the other aftermarket heads out there.. myself i am join with the as cast 225 heads for my 347.

no matter what path you take im sure you will make big power and be happy

LS1NOVA

iTrader: (12)

I like the Trick Flow 235's.

1sick-Z

iTrader: (3)

You are bigger than 4" bore. I woud take advantage of some LS3 style heads. Hard to mess with a 260 cc as cast runner. For forced induction you dont need to worry about the port velocity quite so much espescially with the cubes you have. I would throw the biggest runners on top of that bottom as I could fit and run less boost more CFM.

Remeber all the rules change when you go under pressure. Those CNC heads are very expensive and give you a massive gain naturally aspirated because they are engineered and designed to have air pulled through. Now your pushing it through. You could probably find some GM as cast heads for 1/3 of the price as what you are about to pay for those aftermarkets.

If you were N.A I would say 100% buy the TFS but for what you are doing I feel some square ports will be cheaper and do the job just as well if not better. I am by no means knocking anything that is just my opinion on port velocity and F.I. I have ran he TFS and Darts with no complaints. I am just saying for big cubes there are other options for you.

I8UR4RD

iTrader: (16)

I went with 237's because there are not alot of people running them, and one look into the quality and attention to detail with the valves, and clearances, I was sold. AFR, TFS, and MAST have all been proven to be great cylinder heads. PRC is a little newer to the market, and I don't mind being a guinea pig. I got mine on sale, and they came with badass .675 dual valvesprings.

Think they are a 13.5* angle.

ul-ss

so your saying that since i plan on doing f/i i could just go with ls3 heads and save some $$ i was planning on building the motor running it for a couple years then doing the f/i would there be that much of a power difference against and aftermarket head when n/a? id like to be around 500whp before f/i if possible

6D9 Matt

Think I'm getting some Mast heads for my Briggs 416 stroker. Going forced induction next winter hopefully.

Twin turbo c5

I've always had goodluck with Afr they seem to have a real thick deck which is good for boosted applications. But everyone will say something diffrent all of the heads you've been looking at will do the job.