1gt2nv

iTrader: (5)

I have a chance to buy a new crate motor. It's the L98. Are these any good? I've never heard of this motor. Says it's a LSX. Any info would be great. Thanks!

justin455

L98 is the TPI 350 from the third gens and early C4's. They make awesome torque, but I wouldn't unless it was a smoking deal...not an LSX either.

technical

It could be the 6.0 liter LS motor. Pretty easy to tell the difference. I doubt you could find a new 5.7 TPI L98.

justin455

You can practically buy any engine new as a crate motor. You're most likely right as I don't keep up on truck codes. I know LQ4, LQ9, L92, etc. but never knew L98 was one, although I'm not surprised by GM recycling codes.

If this is the case, then while technically not LSX, it's an iron block, subtle differences version of an LS2 and almost everything is interchangeable.

bww3588

iTrader: (49)

L98 is not a 6.0 truck motor. the L98 was a modified version of the L76 that was only used in Austraila.

justin455

This makes more sense. No wonder I had never heard of it. (L76 = 6.0 in G8 GT for anyone that is still confused.)

bww3588

iTrader: (49)

the L98 was in the Lumina SS and Caprice SS, as well as the Holden Commodore and other Holden models. the only difference is, the L76 has DOD and AFM, the L98 does not.

justin455

good info, makes me think we should have a list made into a sticky of all the relevant GM engines, codes, and applications.

bww3588

iTrader: (49)

we should have a lot of stickies here, if we had every sticky we needed, and everyone searched like they were supposed to, nobody would ever post.

lysergic

great motor. i converted my Z32 300zx to an L98

they have all the best bits out of the box l92 heads, l76 intake

eseibel67

iTrader: (10)

In Australia, an L98 may very well be an LS based engine.

In Wisconsin, an L98 is a multi-port injected SBC. So ya, it's good. But it's no screamer.

SOMbitch

iTrader: (8)

It must be from what the guy above you posted....

RPM WS6

iTrader: (3)

I dislike the L76 because of DoD, and I dislike the L99 for the same reason.

However, the L98 sounds like a good motor. Any LSx without variable displacement is a good LSx.

And the old 5.7L TPI L98 was a great motor in it's day, tons of torque and enough power to finally bring some performance back to stock Corvettes and F-bodies in the mid-late '80s.

LS1W66

Yeah like said above the L98 is the manual trans version of the L76 so it has all the good parts minus the DOD. A simple cam swap with some headers and it should be a screamer.

3.8redbird

iTrader: (3)

I have the first L98 gen 1.I was going to get an L98 gen 4 to keep my c4 "stock" lol

30th6

iTrader: (6)

ok whats dod?

Wiot

I have an '86 C4 with an L98 + Doug Nash 4+3 transmission. I'm pulling it out to put in an LS2. The L98 and tranny have about 79k miles on them and run great. Shoot me a PM if you're interested.

Nova 404

iTrader: (5)

DOD = displacement on demand
AFM = Active fuel management

3.8redbird

iTrader: (3)

im pulling my 406rwhp 383 and 700r4 for a 416cube L92 and 4L60e
where is your write up. I could use all the help I can get lol

wjessica733

The new 1985 L98 added tuned-port fuel injection "TPI", which produced 230 hp (172 kW) and 330 lb·ft (447 N·m). It was standard on all 1985-1991 Corvettes