KLLRVET

I also had a broken .675 spring

timvan

After pulling all the rockers I discovered that I get to pull the heads. 5 of 8 Titanium intake vales are worn down nearly to the keepers. Mind you, these heads were set up at TEXAS SPEED for the cam (mild .613/.623 lift) that was specd by them with their push rods (7.775), and new gm lifters. I did not do the work, I purchased the car with this setup. The car has 19k on the clock, from what im told around 6-7k on the heads.

I would like to know what causes this wear?

ttx350z

Did they have lash caps on them?

timvan

No,they were supposed to have the hardened tips. Apparently they had a bad batch of valves and I am one of the lucky ones. Ive reached out to tx speed to see if they will help. Will See

ttx350z

I did some reading and it seems TSPs hardened tip Ti valves had failures with valves supplied by Trick, so they switched to Manley.

I also read that roller tip rockets should be used with hardened tip Ti valves. It's what Ferrea also states if using their Hardened Ti valves.

Couple of threads out there with broken tips. Good luck

Undy

When were the heads bought? Texas speed seemed to be having problems with their hardened tip Ti intakes after sometime in 2013 when the switched to Trick valves. I believe they've now switched to valves designed for lash caps. I'm running their Manley Ti hardened tip Ti intakes. I'm not aware of and problems with Manley valves. At my 10K mile wiggle test all was normal. They used Manley prior to trick. I bought mine in September of 2012.

timvan

Texas speed is not taking responsibility, first they said the vales needed lash caps (I knew they didnt) so I asked why the good intake valves have the same stem height from the locks as the exhaust valves - they then responded that my valves were made by Trick Titanium and to contact Trick regarding my issue.
Trick basically replied that Valves do not break by themselves (thanks for the enlightenment, I have guns that dont shoot by themselves either) and that they were not set up correctly by TX speed.

Long story short by what Ive learned, if you have PRC heads, #1 swap the springs for BTR or other high quality type #2 if you have Ti intake valves and they dont use lash caps, expect to replace a set of intake valves.

RobsVette04

Sounds like Texas Speed is a garbage shop.

Time for a lawyer in my opinion, that will quickly change their tune.

RedZ4me

Any signs? (like getting louder) I too have PRC 265's but opted for their 700 lift springs (no longer an option on their site) with Ti Intake/SS exhaust. About 4000 miles so far and runs like day one install.

RedZ4me

So BT- is there a direct replacement dual spring for the PRC 265 head that will handle 650-660 lift ?? I have no issues but may buy a set just in case. thanks

JoesC5

I also have the PRC265 heads(purchased July 2013) but my Ti intakes use the lash caps and I have a little over 12,000 miles on them. I am running a stock cam.

timvan

No audible signs, Ran great up until it broke. Fortunately the double spring saved any piston interference. The worn stems did make a bit of noise but nothing that was remarkably loud. The vengence guys even said it was just a loud motor, nobody could know without opening it up.

I purchased this kit : http://www.briantooleyracing.com/660...ers-sk001.html

You have the better setup, same as they use now (oem valves and lash caps) and same as I installed. Hopefully this will last.

RedZ4me

^^ Thanks, just to confirm, good for the PRC head? (need locators for bronze guides which is an option but I'm thinking installed spring height of the PRC head vs a stock ls7 head? I supposed lots of checking but shims are mentioned.

??

this is the descriptor - " .660" Lift Dual Spring Kit for LS engines using stock rocker arms. Includes dual polished springs, matching titanium retainers, your choice of locators for stock or bronze guides, locks and seals.

Spring specs are 155 lbs @ 1.780", 380 lbs @ 1.180", 400 lbs @ 1.130, coil bind @ 1.070" This is a drop in spring kit for all 15 degree LS heads including LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 LSA, etc, this kit will also fit LS7 heads with approximately .045" of spring shim, see items SS015 and SS030.

timvan

Yes, this is good for the PRC according to BT. You need the locators and shims as well as the PAC RACING SPRINGS Height Mic LS PAC-T904 to measure the installed height with shims.

With all the research Ive done over the last few days Ive learned that there are only a few companies that actually make springs, with comp cams being one of them. Id assume since Texas Speed prides themselves as being one of the largest comp distributors that they indeed would have comp make their springs as well.

RedZ4me

^^^

sent you a pm

Michael_D

Before blaming the springs, make sure they were installed correctly to begin with. IE: Install height, distance from coil bind. PAC and PSI are my two go to companies for springs. Ferrea has some good springs too. I am currently using Comp springs, and they are working quite well to date (6K miles): COMP 26926TI-KIT They were the only spring I could find with the rate and loads I needed for .670 lift.

O.D. Outer Spring: 1.320''
I.D. Inner Spring: .654''
Spring Rate: 505 lbs/in
Seat Load: 129 lbs @ 1.835''
Open Load: 470 lbs @ 1.160''
Coil Bind: 1.100''


I had them checked last fall, to determine whether or not is was time for a spring swap, but rate/pressures were right on the money.

Jason 98 TA

Don't worry give us a yell & we will get you lined out. The valves are top of the line Trick Titanium valves. They will help if something is going on with them.

Don't worry about the spring we will swap you over to the updated version of the .675" spring. It has slightly less spring pressure, but is super reliable.

Unreal

18k miles on my prc 285 with .650 lift springs, zero issues. TSP is a top notch place.

cr133r

How updated? My heads are barely a year old and 3 of the springs are broken.

badass7

Wow, I was just in the phone with Texas Speed to purchase a modded Ls7 Longblock for my '06 that dropped a valve and blew a hole size of your head on side of block.

I talked to them twice, looks like I'll look into going Diff route.