Da Fonz

Ok, so my first post was a super success in helping me, so here we go. My question is I have a 98 z28 with 140k miles on the motor. It's gone 12.80 with a consistent time of 12.90 all day. The problem is, that I am taking this motor out to freshen it up and get her all cleaned and inspected just cause I know it is not long before i blow her sky high lol. The thing is that everyone is suggesting I step up to a ls2 while I have the motor out, seeing how all the parts are interchangeable. I know I have the old style oiling ports in my motor is that gonna hinder me in anyway? Do I just buy an ls2 short block? if so, do I need a new wiring harness or computer? or am I just an idiot overthinking this? Its gonna be mildly built cam/heads added to my previous set up. Once again, thanks for the help! everyone was extemely helpful in my first post.

TransAmWS.6

Not sure about the wiring harness, but, I would definitely swap in an LS2 shortblock if you have the funds, that's definitely a solid upgrade, or even an LQ9 would also be a good option, you can get those for real good prices. And yes, you're probably going to want a new tune on the car once everything is installed.

Da Fonz

Yup, planned on getting a tune due to the head/cam combo. LQ9....that's the truck block right? The iron block?

TransAmWS.6

Ok cool, was just making sure you knew, ha. But, yeah, the LQ9 block is iron and it was in the Escalades, Silverado SS's, and a couple of the other high-end GM fullsizes, would be another very good choice and can be had for a pretty reasonable price.

garygnu

it don't cost much to convert to a ls2,also get a ls6 intake and a nice cam pkg too make it worth your while.

S8ER95Z

iTrader: (3)

Is the ls2 vastly superior to the ls1/6?

TransAmWS.6

^^The Intake or the motor as a whole?

S8ER95Z

iTrader: (3)

The motor... I see people switching just didn't see a good reason and wondered why. Thanks!

Da Fonz

I have a good intake, gonna do heads/cam combo also, but do i need to get a new computer? Or just get a tune? Idk if it makes a difference. I have a 98 z28. Is there anything else I could be missing?

Da Fonz

By the way, I'm switching from ls1to ls2 cause they have a bigger cylinder bore, and a different oiling system within the block. My motor right now has 140,000 time for a freshen up, so I figured may as well upgrade and keep this motor off to the side. My ls1 being pre 99 has different castings than post 99. But I will say, I have not had ONE problem with this motor! At all!!

777

iTrader: (21)

People switch to the ls2 because the bore size is larger = more cubic inches. You would have to at the bare minimum get ls2 pistons or new pistons with that bore size.

The only thing that is a direct swap would be an ls6 block and there's no reason to pay money for one since they are nearly identical and offer no gains.

EDIT: didn't see your post above, you already know what I said haha

ULTIMATEORANGESS

iTrader: (4)

i went with an ls2. i just had my heads and everything swapped over. added a FAST 102.


i think it runs strong as **** and im happy i went that way.

zracer323

iTrader: (12)

Texas Speed (and other companies) sell an LS2 conversion kit. You will need a different camshaft position sensor, LS2 valley cover, and knock sensor wiring harness.

Lockdown99ss

iTrader: (1)

Also, if you haven't already done so, get yourself an ls6 coolant crossover. Makes things cleaner

Da Fonz

Thanks man! I checked em out and they everthing I would need. Nice!

Da Fonz

Coolant crossover? Is that the throttle body bypass? Or something different?

Lockdown99ss

iTrader: (1)

Nah look it up on eBay. Just a coolant pipe connection the two heads up front under the tb. The tb bypass connects to it though. Look at a picture of it and it will make sense