L98 vs LT1
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TECH Enthusiast
Joined: May 2006
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From: Metairie, LA
L98 vs LT1 I'm sure this has been done a million times, but can anyone give me a link comparing and contrasting L98s to LT1s? I love 3rd gens but would like to start learning the ins and outs of the L98 engine. Didn't it come in Corvettes of this era too?
Also, what cars came with L92s? How are they different from L98s?
Also, what cars came with L92s? How are they different from L98s?
Teching In
Joined: Mar 2006
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From: E-Hurst IL
L92 is a throttle body motor if I recall correctly
differences between L98 and LT1 lets see what I can come up with off the top of my head
L98 gen 1 small block LT1 gen 2
L98 21 inch runner LT1 3 inch runner
L98 standard cooling system LT1 reverse
L98 uses standard dizzy LT1 has cam driven dizzy behind water pump
L98 in F body uses iron heads only Vette gets aluminum LT1 in Vette and F body is aluminum B body LT1 is Iron head
Cams are totally different
L98 belt driven water pump LT1 cam driven
I think thats about everything if you have any other questions let me know
differences between L98 and LT1 lets see what I can come up with off the top of my head
L98 gen 1 small block LT1 gen 2
L98 21 inch runner LT1 3 inch runner
L98 standard cooling system LT1 reverse
L98 uses standard dizzy LT1 has cam driven dizzy behind water pump
L98 in F body uses iron heads only Vette gets aluminum LT1 in Vette and F body is aluminum B body LT1 is Iron head
Cams are totally different
L98 belt driven water pump LT1 cam driven
I think thats about everything if you have any other questions let me know
the one thing i remember about my old IROC is that on the street it was a monster. It only ran a low 13 to high 12 but the low end torque was rediculous! It would fall flat on its face after about 5200 rpm though 
I like the 94+ LT1 because they use a flash chip in their computer that can be program or read by a laptop. Don't have to burn chips or anything like that. The 94+ LT1 computer can just be reprogrammed for the speedometer for gear or tire size changes, no need to change out speedometer drive/driven gears.
You don't have to have a thirdgen with the engine that came with it(L98, or whatever). You can swap in a LTx/LSx. I've even seen a few thirdgens for sale with a LT1 already installed at thirdgen.org in the past year.
You don't have to have a thirdgen with the engine that came with it(L98, or whatever). You can swap in a LTx/LSx. I've even seen a few thirdgens for sale with a LT1 already installed at thirdgen.org in the past year.
Last edited by Firebat; Mar 6, 2007 at 11:22 AM.
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Originally Posted by eLTwerker
Two questions...what's the runner and what is the dizzy?
dizzy is the gear that replaces the dist. on lt1's.
still drives the oil pump.
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From: Metairie, LA
the oil pump is in the back of the block, water pump is in the front on LT1s. How can the dizzy drive the oil pump in LT1s? The oil pump is driven by a gear driven shaft perpendicular to the cam(also driven off the cam).
the L98 is no different from any 350 you get out there. 9.5:1 comp, all iron, stock bottom end is good for 6500 rpm and ~550 HP n/a
Everyone centers around the stupid factory intake as if you can't take it off, sell it to some street rodder on ebay for a good chunk of money, and replace the turd with an Holley Stealth Ram and have no RPM cap whatsoever (lest you spin past 8000 rpm)
Everyone centers around the stupid factory intake as if you can't take it off, sell it to some street rodder on ebay for a good chunk of money, and replace the turd with an Holley Stealth Ram and have no RPM cap whatsoever (lest you spin past 8000 rpm)
Originally Posted by Quick1998Z28
the L98 is no different from any 350 you get out there. 9.5:1 comp, all iron, stock bottom end is good for 6500 rpm and ~550 HP n/a
Everyone centers around the stupid factory intake as if you can't take it off, sell it to some street rodder on ebay for a good chunk of money, and replace the turd with an Holley Stealth Ram and have no RPM cap whatsoever (lest you spin past 8000 rpm)
Everyone centers around the stupid factory intake as if you can't take it off, sell it to some street rodder on ebay for a good chunk of money, and replace the turd with an Holley Stealth Ram and have no RPM cap whatsoever (lest you spin past 8000 rpm)
And those heads must be quite godly to support 550hp.
Same with the cam.
And that distributor.
And that holy EFI system.
So basically, replace every part related to it being an L98, and it can perform like any other SBC. Who coulda guessed? You're genius.
The LT1 has more power in stock form than the L98, but i think the tpi has much more potential and can be had for much less. Since stock sbc parts will work, you have a vast array of parts to use. With upgraded pcm and runners, it performs very well, plus no opti to deal with. The longer runners on the tpi also make for a much more torque producing street motor.
Teching In
Joined: Mar 2006
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From: E-Hurst IL
Anybody that says you cant make good power with a TPI and Long runners is a fool
http://www.thirdgen.org/techboard/tp...-tpi-dyno.html
and I know for a fact that TPI gets along well with turbos and can go fast with very little
http://www.thirdgen.org/techboard/tp...-tpi-dyno.html
and I know for a fact that TPI gets along well with turbos and can go fast with very little
I feel so sad whenever I see my father-in-law drooling over a TPI like it is the most powerful engine on the road.
If you want to go old school go big block. Not many people can say that a SBC (or a factory TPI) is better than a BBC.
If you want to go old school go big block. Not many people can say that a SBC (or a factory TPI) is better than a BBC.
Teching In
Joined: Mar 2006
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From: E-Hurst IL
Originally Posted by FieroZ34
400whp isn't that good though. An LS1 can do that with bolt ons.
Originally Posted by Formula350sd
..if you need more than 400 wheel horse in a street car to cruiz around in you got a problem..
There is nothing wrong with having power on the street, just don't hammer it all the time. When someone wants to play, then bring it out and **** them up..
Originally Posted by Formula350sd
Thats a really mild motor and people always forget to mention that an LS1 has a 15 DEGREE cylinder head and the advantages of years of research in runner design that came after the TPI engine (I know newer is better) if you need more than 400 wheel horse in a street car to cruiz around in you got a problem race cars are a different story
Do us a favor, buy a Honda.