what size ports are on these heads?

 

Trickflow's dont require Aftermarket rockers either, just get the TEA spring package and grind down the stock rocker stands. install the comp trunion upgraded stockers and your good to GO!

BTW Texas Speed my offer still stands, back to back 1/4mile track comparisons for your PRC LS1 AS cast heads vs my Trickflow LS1 220 As Cast heads. Car is a full track car 82' Gbody with a stock bottom end LQ9, Powerglide. Only changes would be heads and fueling both setup to 12.8:1-13.0:1 AFR @ WOT on the wideband of course.

 

How would these compare to your 215 head? HP Gains seem very similar between the two. Looks like 10-15hp over the 2.5 ls6 heads.

 

06x6,

Id be more interested in a side by side same day engine dyno & flow bench comparison. Would you be interested in that?

 

As far as comparing to the 215s I guess it all depends on the combo.

I really like the PRC 227 heads, they are without a doubt the best 3.9" bore heads available. the as cast was based off that head so while it doesn't move the air the 227 head does, it still performs awesome & I'd put it against any other LS head on a 3.9" bore no problem.

 

Jason,

You guys just need to do a dyno with the TFS 215 vs. your PRC 215/227. I have no doubt that your PRC will stack up to the TFS. You guys def have came along way. People are still stuck in this illusion that PRC is just a budget head.

I would just post up the charts, screw everybody else feelings..

 

Sure, let me know how I can help. I figured Track Results with simple wideband tuning would speak alot for the general crowd. Can do Chassis dyno results at some point too.

 

06X6,

That would be sweet man if you and Jason could ever get that arranged.

 

Updates?

 

you're using 2 entirely different cars with different trannies.

All variables should be the same including the car/drivetrain/tire with the only difference being the heads.

 

I don't seem to understand why so many people want compared to brand X
heads as controlling all the variables becomes very difficult. From the pics
and now results provided it appears to me that TSP has poured their heart
and soul into a cost consious design for the 3.9" bore AS CAST market.
No more or no less.....I mean 30 horse over the LS6 243 casting with about
6 more cc of intake volume, that is very impressive !!! Port speed, air velocity
and throttle response will be tremendous.....Great job.....

 

nice head for the price.how well do the ports line up with a fast intake ?

 

Haven't seen anything on these in a while. Anyone running them yet?

 

Which prc's are the ones for my 01ss. I have LT headers, 224r. I want to squeeze as much power as I can. As of right now I'm 378rwhp and 360tq

 

The texas speed rep already said the 227 are the best hands down for 3.9 bore.

 

Hopefully the OP still remembers about this build and can reply, but were these gains over a ported LS6 heads or a stock casting?

Idk if it's just me but I had more expectations for the as cast PRC heads. I was looking at them extensively due to the great price point and hollow valves, but if that's really all the power they pick up over OEM 243 heads it might not be worth it. I've seen ported 243s pick up a good 35-40rwhp over the OEM 243 castings, so if these only pick up 30rwhp then that's pretty dissapointing.

 

This test was done comparing a stock 243 to the As Cast casting.

I understand where you are coming from but keep in mind peak horsepower was not the only goal with this head. Our aim was to offer an aftermarket casting head for an affordable price. While a hogged out 243 casting will make the same if not more peak power, it will end up leaving low end power and throttle response on the table. We are able to offer a thick deck, 6-bolt casting, laid over valve angle, and smaller chamber for a very good deal. In the process of trying to offer all that, the head ended up making 30rwhp over a stock 243 in this test. For what its worth, we have had multiple cars make slightly over 500rwhp with these heads in ideal conditions.

Thanks
John J