nitrouscharlie

I am on their web site and I have called, but am a little confussed. They offer "NEW PRC LS6 CNC Ported Heads" for $899.99
"NEW PRC Stg 2 Dart CNC Ported Heads" $1,599.99
"PRC LS6 Stage 2.5 CNC Ported Heads" $1,499.99

My question is what's the difference in the three. And aren't the "Dart" heads just regular LS1 heads with a port job? Can someone please explain this stuff. I want nice heads but I don't have the money to keep buying heads.

Mr. Big

1 the PRC LS6 heads for 899 are probably bare heads, no valves or springs

The stage 2.5 will be fully assembled with larger intake and exhasut valves. Both are of course GM Heads that were ported and polished.

The dart head used a ported GM head as the model and then casts its head from that. IE and unported DART head is a ported version of the LS6 head. It is not cast by GM it is cast by DART. They also have a thicker deck to them. PRC then ports even deeper the dart head to get a better flowing head.

The best head is the Ported Dart, especially if you intend to run a power adder.

nitrouscharlie

I read your post and then went back to there page to check, the Stage 1 LS6 heads are fully assembled, with reg. LS6 springs, and the LS6 2.5 heads have dual springs, that seems to be the only diff. Surly not though, springs are only a couple hundred bucks...

mdhmi

You get what you pay for. That is not a knock on any of the products mentioned here, but just the valve springs in my heads were over $500.

So if you're talking about LS6 heads complete for $900 I'd really wonder what type of valve train components are included.

My guess is that you would have to upgrade the valve train components to run a good aftermarket cam.

99SoCalFRC

I think on their site is says you can substitute comp 918 springs for 125 bucks, that's in the 1100 range for ported LS6 heads, good to maybe 590 lift, great deal. Sure plenty of guys will go drop 2200 on AFR's and another 500 in springs, not everybody has that budget or mindset.

WKMCD

TSP is not promoting the Dart heads any longer due to problems. They do have the new Edelbrock small runner heads that look very promising. The Stage 1 CNC'd LS6 heads are a great budget head but you'll want to upgrade the springs. The 2.5 LS6 heads are CNC'd to deliver higher flow for larger cams and higher end performance. They come with dual springs and a "competition" valve job.

I've been talking to Jason a lot lately.

I'm currently running the TSP 2.5R 5.3 heads and I'm very happy. I'll probably go with the Edelbrock large runner heads for the stoker this winter.

N0TDADYS_98

The PRC LS6 ported heads are assembled. They are GM LS6 heads fully assembled from the General. They have LS6 springs. Also i believe the price on their website is no-longer accurate.. I believe it's 999.99 now as they do a valve job on all the heads (not optional anymore)....

The Dart heads are their own casting and have different flow characteristics of the LS6 heads.

and no idea what the 2.5 is.


I'm not familiar with the lift numbers on the LS6 springs but my understanding is they are fairly decent.... but if you do a cam you might as well upgrade anyways...

TA8088

I sense that the SO has some jewelry coming her way soon. You mean your car isn't fast enough already?

Y2Kvert4me

Stage 1 CNC LS6 = stock LS6 head, stock valves, and stock LS6 springs. PRC dual springs are an option, as is a better vavle port job, but they up the price to $1249.

Srage 2.5 LS6 comes with larger aftermarket valves and the PRC dual springs.

The Darts are a complete new casting, not based off a GM head.

vettenuts

I am running Dart 205's, like them very much and bought them off Jason. They have an excellent valve train setup and other than some mild cleanup with sanding rolls, I am running them out of the box. I know someone who bought their LS6 heads, the "inexpensive" ones, he made 447 rwhp with their cam. TSP did have some problems with the Dart heads when they ported them, to my knowledge the issue was never figured out and one set went back to Dart who went as far as doing x-rays on the heads and they didn't find the problem either. One issue you do run into is a lot of guys modify their PCV system so that may have been part of the reason for the problem. Don't be concerned with the less expensive heads, if you have a cam picked out or installed just talk to Jason, they can advise you on what options you might need if any.

jbusmc1986

Just a little fyi TSP has stopped carrying the dart heads because of the problems that they were having... they will be carrying the new edlebrock heads though

Personally I would go with the prc's with them and my cam I shoud be around the 450hp 420 tq from what others have made with my combo

Jason 98 TA

Thanks for all the kind words guys! We have a set of the stage 2.5 LS6 heads on a car with a ms4 on the dyno right now! Look for a dyno sheets Monday morning! We're shooting to get as close to 500rwhp as we can with a fast 90 out of the box

We've worked really hard on these heads & they work very well! Look for them in a upcoming edition of GM High Performance! The heads & MS4 camshaft gained 130hp!!

Jason
Texas Speed

NeverT00Fast

Jason, this is Tom, I ran the MS3 with the PRC stg 1 heads when the heads first came out and got great results with the chart posted on LS1Tech.

Will the MS4 fit on the stg 2.5 heads without flycutting? If so, how much PTV is there to play with? How much power can I look to gain if I go from the MS3 to the MS4? Will the MS4 give me more low-end power to get rid of the cam surge under 1500rpm?

Oh4GTO

Bringing this one back to life.

WKMCD

Changed my mind. I've got a set of L92 heads and the L76 intake going on the 402 right now. These heads should make big HP with the crazy cam we're putting in. Hoping to have it up in about 3 weeks.

Stay Tuned.

slayer6x6

The LS6 Stage 2.5 sound very tempting for me, I may have to look into them.

Blue02ws6

My 402 FRC is sitting there right now waiting for the larger runner edelbrocks. We will have to compare numbers... I am not doing a very radical cam though.