Full L98 to LT4 Conversion?
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
Full L98 to LT4 Conversion?
A friend (yes, it's not me) has a '91 very tired vert and has the opportunity to purchase a low mileage LT4 for a reasonable price. I've tried to locate info on this conversion with no luck.
Has anyone done this out there that might shed some light on what would be expected with this? I know that's a very general question, but I'm thinking there has to be an archived thread out there somewhere with detail. Any leads would be greatly appreciated.
Thanks!
Has anyone done this out there that might shed some light on what would be expected with this? I know that's a very general question, but I'm thinking there has to be an archived thread out there somewhere with detail. Any leads would be greatly appreciated.
Thanks!
Safety Car
Joined: Jul 1999
Posts: 3,946
Likes: 63
From: Marianna FL
Well the easiest way to do it would most likely be to machine the LT4 intake to accept a distributor and use the L98 distributor in the LT4 car. GM makes a block off plate for the timing cover on the LTx engines so they can be used with a distributor in carbed applications. The rest would be connecting fuel lines, getting it tuned, making sure the water pump inlet and outlet go to the correct sides of the radiator, and I suppose using the LT4 accessory bracket and accessories. Starting to sound like a PITA to me. 
I'd just build the L98 with a miniram and a good set of AFR heads.
I'd just build the L98 with a miniram and a good set of AFR heads.
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
I would think he could leave the opti on rather than going back to the L98 distributor. Or am I missing something?
What I'm talking about is pulling the L98 out and dropping in a complete LT4. I'm looking for inconsistancies that might occur in electronics, sensors, etc. I'm sure fitting won't be a problem, it's the same body as my '93 w/ an LT1.
What I'm talking about is pulling the L98 out and dropping in a complete LT4. I'm looking for inconsistancies that might occur in electronics, sensors, etc. I'm sure fitting won't be a problem, it's the same body as my '93 w/ an LT1.
Last edited by jimg's'93; Jan 18, 2008 at 08:06 AM.
Safety Car
Joined: Jul 1999
Posts: 3,946
Likes: 63
From: Marianna FL
I'm saying to keep the L98 distributor in order to keep the factory wiring harness in tact. If you want to swap wiring harnesses and everything, leave the Optispark. Seems easier just to build a better engine out of the L98 for the money spent on the conversion.
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
Waste of time.
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
big up with pickers to use a caprice lt1/ HEI/ l98 ecm (they abhore the opti due to cost and off-road unsuitability) in their toys...several locals have done it and obviously ''rocket science'' is not involved...check the truck forums for info.
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