mitchntx

iTrader: (14)

Finally rounded up all the parts needed to get these guys installed. Fired up at 3pm today. I haven't really layed into it yet, only reving to about 4K.

The heads are LS1 stage 2 milled .020".
Engine specs are:
'98 stock cube 80K bottom end, LS6 intake, TR220/.558/114, FLPs-Borla

Initial observations ...

The valve train is quite noisy. Lot's of clattering and clicking. Nothing really loud, just noticeable.
All push rods were checked for proper seating and rockers were all torqued to 25ft/lbs.
Is this noise normal?

2K to 3K seems a little off. Not as much pull as I recall.
However, once at 3K, it finds 4K very fast! I'm very optimistic on what the results will be.

I plan on running on LGs dyno this weekend and see what the heads only chnage resulted in.

Thanks to Glenn and Chuck for their help.
Couldn't have done it without them.

Ron@Vengeance

iTrader: (51)

Mitch, might wanna loosen the rockers to 22 ftlbs. I doubt its part of the noise problem you are describing, but 22 ftlbs is the correct torque.

Goodluck on the dyno. It will be cool to see some heads only results....

slyws6

Just curious, why didn't you go with the 5.3's?? Is it because you wanted to stick with the perimeter bolt valvecover??

-Sly

mitchntx

iTrader: (14)

Exactly and the 5.7s were delivered for about $1K

slyws6

Ok that's what I figured.

-Joseph-

iTrader: (12)

I been wanting to get those 98 Perimeter stage II heads for my lil brothers 98 T/A. The price is awesome for the 98 heads.

Jason 98 TA

iTrader: (4)

Yeah we've had alot of people interested in the perimeter heads lately at 999 I hope they work out great for you Mitch!!

Jason

Mike98WS6

iTrader: (5)

Good luck with the PP heads. For under 1K, how can u go wrong.

Z O SICK

iTrader: (1)

Good luck with the heads. You cant beat that pirce!

foff667

iTrader: (2)

yah im just waiting for them to come in this week...then i can get mine on

Mike K.

I had to loosen my rockers a bit on my first cam install cause the noise/preload was to much and it did quiet it down alot.

NA$TY-TA

iTrader: (21)

Do you know how many sets of 98 heads Terry has left anf how long they will be at $999?? Im looking at ordering a set with in the next 2 weeks or so. Jason you PMed me before on these w/ 71cc chambers i was just wondering how long because i dont want to miss out on them at this price.....
Thanks
Kyle
Didnt mean to hijack your thread either.

-Joseph-

iTrader: (12)

Kyle, I'm pretty sure there will be enough for 2 weeks.

mitchntx

iTrader: (14)

I drove it the 20 miles to work this morning, to get another heat cycle on the springs.

I gotta say I am very impressed with the springs. Very smooth, nice finish, excellent seat pressure ... good looking spring.

The trip this morning was again a Sunday drive, keeping at 2500 or below ... for the most part ...

The car does seem to pull a LOT harder above 3K.

I am gonna pull the valve covers later this week and retorque all the rockers

TVWilkes

NA$TY-TA,
I have over 200 sets of the 98 model heads.The everyday price is $999.00 for the stage 2 heads.

NA$TY-TA

iTrader: (21)

Terry,
I had asked before if i could get my 98 heads with 71cc chambers for my FI setup and i was told yes. The only other question is do you or can you O-ring the head and how much do you charge for that? Should i just call? Thanks
Kyle

slyws6

MitchNtx: Hey another thing to keep in mind, when you have your battert disconnected for that amount of time and the computer resets it will have to relearn your setup. After 100-150 miles the car should idle better and run better. I know mine just hit 137 miles today since the head install and i went to start it up and BAM it idled perfect and I could tell a difference in power. It's kind of crazy but when this happens you will notice a difference, at least I have the 3-4 times I have had to reset my PCM or do a head/cam install and had the battery disconnected for a short period of time. Just food for thought.

-Sly

mitchntx

iTrader: (14)

Thanks for the heads up ... the plan was to drive it to work every day this week for that very reason.

That should put a couple hundred miles on it and heat cycle the valve springs 2 times each day.

After 23 miles of tooling around last night, this morning it popped right off and idled great. It was also 40 degrees here and the pavement was rather cold. So, it was relatively easy to break loose the tires ...

White_Hawk

iTrader: (3)

I don't know what the lifter preload tolerances are for the LS1, but adding .020" to the preload will probably put you out of spec (which might also account for the increased noise you hear). On my GN the spec was .030" preload +/- .010". So if you added .020" of preload by milling the head, you are probably out of spec. I think you can shim the rockers to get it back, but you really need to measure it first to find out where you are at.

-Geoff

10secondZ

iTrader: (24)

Exactly what I was thinking...that would make the valvetrain noisy and cost you some usable power if the lifters get and additional .020" preload...see if someone can either make you a 7.360" pushrod or just shim the rockers .020"..should help out alot.

Carter