Jason 98 TA

iTrader: (4)

Texas Speed & Performance wanted to be the first to introduce a new line of 5.3L LS1 cylinder heads by Precision Race Components! We did a heads/cam swap on a '98 Z28 A4 using the PRC stage 2.5 cylinder heads and our MS3 camshaft (237/242, .603"/.609", 113 LSA), along with PaceSetter long tube headers, TSP 3" true duals (Rumbler X system), ASP underdrive crank pulley, LS6 intake manifold, TCI 4400 Competition torque converter, TSP hardened pushrods, MSD spark plug wires, NGK TR55 spark plugs, and an in-tank Walbro fuel pump. With an induction lid and TCI 4400 converter as the only mods, the car baselined at 283 RWHP. After all of the mods listed above, the car put down 424 RWHP with an UNLOCKED torque converter! We didn't think it was too bad for a 90,000-mile short-block.

The car was not spun to over 7,000 RPM. The RPM reading is off due to the high stall torque converter. All runs were made to 6,700 RPM.



The Precision Race Components stage 2.5 cylinder heads feature the following:

*fully CNC-ported cylinder heads with hand-finishing
*Ferrea stainless 2.055"/1.60" valves (only offered as stage 2.5)
*PRC stock-diameter dual valve spring kit with titanium retainers (good to .640" lift!)

Once the customer finishes upgrading the suspension, he will have it at the track for some 10-second timeslips. Imagine how it will run once it has a Meziere electric water pump, FAST LSX 90mm intake, and 90mm throttle body!

We will have the Precision Race Components cylinder heads and valve spring kits on the market and ready to ship within a few weeks, so stay tuned for more results!

Jason
Texas Speed & Performance

mikes02ls1

iTrader: (2)

Damn good Jason. Can't wait for u to put some heads on my car. Oh by the way I put some ET streets on my yesterday, I got to learn how to do burn outs and to drive. The best 60ft is 1.999 with a ET of 12.7@114
Mike

2000PewterZ28

That is some nice results.How much are the stage 2.5 heads?

gettinthere

iTrader: (3)

I'd like to know a price on these as well.

CHRISPY

EASY tens with that setup and a good tire!!

Ragtop 99

iTrader: (7)

Very nice results.

Jason 98 TA

iTrader: (4)

This was one of the prototype heads. We should receive a few more sets in under a week or so The cylinder heads sell for $1529 outright, or 1329 if you supply the cores

Jason
Texas Speed
www.texas-speed.com

BoneSS

iTrader: (9)

How do these heads compare to the Race Style PP Heads? Would you expect around the same numbers?

F1_SS

What kind of numbers could i expect out of a full bolt on, with a PT4000 car with full tune and the MS3? Think 400hp is possible?

CamaroCain

iTrader: (1)

Ditto???

jdnz28

iTrader: (2)

Jason ,
Can you do me a mail order tune for these heads , stock bottom end, with your magic stick cam v3 cam ?

CamaroCain

iTrader: (1)

Just call the shop and ask to talk to Jason, easier than talking back and forth on the board, and you can understand things much better

jdnz28

iTrader: (2)

Thanks, I talked to jason the other day , a great guy to deal with. Ive been doing a little homework before purchasing the magic stick v3 cam . Which stall converter , heads, to go with , also need to ask jason about porting my throttle body . Will be ready soon , just installed a moser 12 bolt with 373's . very happy with it so far ....

Jason 98 TA

iTrader: (4)

Sorry for the delay everyone! The PRC heads flow right around 317cfm on the intake. I forgot what they did on the exhaust. I'll try to get some pics up soon

Jason
Texas Speed

JZ'sTA

iTrader: (23)

Damn impressive results.
With the correct track conditions, a 90mm TB and Intake and the right tire this could be the fastest stock cubic inch stock tranny, non solid roller LS1 in the country.
Cant think of any other A4's making these numbers especially through a 4400 stall.

BoneSS

iTrader: (9)

Jason,

Will this H/C combo clear the pistons okay? I couldn't find anything about flycutting. That was my concern w/ the Race Style PP heads. The under the curve power sure did change from cam only!

https://ls1tech.com/forums/dynamometer-results-comparisons/196368-texas-speed-magic-stick-camshaft-goes-400-rwhp-stock-heads-a4.html

gomer

iTrader: (13)

I would expect the same or better numbers... for less $$

99-LS1-SS

Damn I wish I had enough money right now to get those heads and that cam.

bad2000ss

iTrader: (6)

Very impressive!! You guys are making me wish i bought the Magic Stick instead of the 231/237.

Are there an Piston to Valve clearance issues with the MS3 and those heads?

BoneSS

iTrader: (9)

Jason,

Are you all going to be offering h/c/gasket/pushrod kits w/ these heads like you do the PP heads?