AllCammedUp

Just got my new TEA 5.3L heads, and with the Comp 987 dual-spring setup I've got, I have a 1.77 installed height.

Just wondering what stock was for the 99 LS1 Corvette?

BTW, these heads are freakin' awesome looking! If anyone has some heads on order/in process w/ TEA right now, I'm sure you won't be dissatisfied. These guys were certainly worth the wait!

I searched first, but didn't find anything.

Thanks!! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Racefan12

Most all ls1 heads setup around 1.750"-1.800"...just depends on valve, retainer, and how they were machined...yours are fine
<img border="0" alt="[Camaro]" title="" src="graemlins/camaro.gif" />

Scalpel

iTrader: (4)

Does this lower than stock installed spring height affect the length of p-rods needed? Thanks.

AllCammedUp

Thanks NastyC5, that's what I was going to figure out once I got the specs. You hit the nail right on the head.

Thanks for the confirmation, Racefan12. TEA knows their stuff, so it's not really a question of whether mine are ok or not - I know they are - I'm just trying to figure out what variance mine has from stock so I can add/subtract that to get the right p-rod length.

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Tin Indian

If you are not real sure if you have the correct length pushrods after it's all sdaid and done, you can always do this:

Turning the engine, bring the exhaust pushrod on any cylinder up until it is at peak lift (valve fully open). Now, install a pushrod on the intake of that cyl. (this valve will be fully closed) and turn the rocker arm bolt down until the lifter is at "zero lash" (pushrod will start getting harder to turn when spun with your fingers). Mark the bolt with a marker. Now, count how many turns it takes to completely tighten the bolt to 22 FT/LB. From what I have read, the bolt should have turned between 1 to 2 turns for the acceptable GM lifter preload.

Again, one pro engine builder here has posted 1.0 to 1.25 turns of the bolt. Another builder posted the correct preload would be reached with between 2.0 to 2.25 turns.

So, here we go again; Two different answers. If I was back in Phoenix, I would just go out to my stock engine, pull a valve cover, and actually let you folks know how many turns it took on a stock motor. That would end the speculation.

Whithout knowing than, I can only assume between 1 to 2 turns based on the different info that was posted here.

Ron,

Tin Indian

BTW, spring "installed height" should not effect actual lifter preload. All installed height will change is how far the spring is compressed at any givin point of cam rotation.

You just need to make sure the aftermarket valves are the same length as the stock valves.