Guys here's a few pics of the all new Precision Race Components cathedral port cylinder heads. Sorry for there being so few pics, but I'll hold most the pics & specs for when the final version is completed.

We're currently working on several different versions of the heads but past that I can't really give any additional information.

Here's what I can tell you:

.800" thick deck!!
Modified Valve Angles
Better Than Stock p/v on some port configurations!
Multiple Port Options
Multiple Chamber Options
6 Bolt Upgraded!!
356-T6 Aluminum Casting

Designed & Built completely to our specs!

We're currently testing various versions of these cylinder heads on several different applications.

Sorry I can't give any additional information currently.

All I can say is I think you guys will really like the flow/features/pricing of this cylinder head!

*these things are made in America!!

 

up up up!!!

 

thats cool but im gonna mad if the price is withing my prc 2.5 heads and they out flow them cuz ive only had them on like 3 weeks and i love their performance

 

OOOOooooh! Very interesting. The choices just keep getting better and more confusing for when I need to upgrade past my Bo White heads one day in the future.

 

How long do you think Jason before they are out? 2 months? 3 months? Ill hold out on getting the new 5.3l R heads for these if they are better

 

July is my bet

 

To us noobs, explain why these heads are going to be bad ***.

 

+1 ANY info you can get will help, I am looking to get a set of heads from you guys soon, a quick question is will these be better than your new 5.3l R heads?

 

Hmmm aftermarket vs. stock ported GM. All the time and r&d $ to make a head worse than what they have? Isn't it quite obvious?

 

That'a nice thick deck. Are they taller and thicker like the et castings or just thicker all together?

 

subscribing

 

What are you talking about, I am asking them to compare these heads to their ported stg 2.5 5.3l R version heads

 

He used logic to defeat your argument before it even began. For some odd reason you still desire to carry it on. ???

 

Yep its a simple question I am asking TSP not anyone else

 

Looks awesome !! What are they modeled in?? Catia?

 

Jason clearly stated he wasn't ready to divulge all the specs. Common sense tells me that he can't compare it with the 5.3l head without discussing the flow numbers and test results.

 

To answer the question earlier, when you port a factory head, you are forced to work within the constraints of how GM designed the head. With an all new cast head, you can start with a 'clean sheet' if you want to call it that, and add material where you want it but with a factory head it's more difficult to do. Like the original post said, they plan to change the valve angle as well, which helps with piston to valve clearance as well as flow characterisitcs.

 

+1

+2

 

need anymore test cars?

 

Cant wait to see the results......AND the price!