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Topic: Will an '89 L98 TPI fit in the '84

in Forum: C4 Engines

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Re: Will an '89 L98 TPI fit in the '84 (4/14)
8/11/13 11:55am

Big Mike 49
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San Jose, CA - USA

Vette(s):
1988 Corvette / Blue Pearl

Joined: 5/10/2012
Posts: 81

What is it that the L98 long block has that the Cross Fire Block doesn't ? Would it be the Cam Profile ? ( Grind ) Just over hearing some early C4 owners they just call the cross fire junk . I've never bothered to ask them why , Maybe you folks can help me understand better . Was it just the Cross Fire intake ? Was it restrictive....compared to the TPI intake & runners ?

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Re: Will an '89 L98 TPI fit in the '84 (5/14)
8/11/13 1:11pm

Red
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Hemet, CA - USA

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1986 convertible, bright red, white top, red interior

Joined: 3/24/2013
Posts: 22

The cross fire was not junk, it was the first engine used (1984) in the evolution of the C4.

There are wide and varied opinions from outside and from the inside of the C4 family regarding many aspects of the C4. Everything depends on perspective. Every year of C4 production saw technological advances. Some, but not all, C4 owners look at the latest in automotive technology and performance and dismiss everything before as obsolete junk, including engines, sound systems etc. etc.

IMHO that is why there is more interest and value in the second half of the C4 generation.

What is important is how you feel about your car, and what your expectations are.

People collect everything from Model T Fords, classics, muscle cars, Corvettes, C1, C2, C3, C4, C5, etc. each car and each owner has a place in the car hobby family.

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Re: Will an '89 L98 TPI fit in the '84 (6/14)
8/11/13 1:48pm

laurieb
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Sacramento, CA - USA

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1995 Coupe, Automatic, Dark Red Metallic, 1G1YY22P6S5100376 1985 Coupe, Automatic, Gold Metallic, 1G1YY0783F5114974

Joined: 4/11/2013
Posts: 109

Just watching this one.

|UPDATED|8/11/2013 10:48:34 AM (AZT)|/UPDATED|

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~Laurie~

1985 and 1995 coupes:

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Re: Will an '89 L98 TPI fit in the '84 (7/14)
8/11/13 10:40pm

Adams' Apple
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Duncanville, TX - USA

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1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.

Joined: 3/18/2009
Posts: 2230

Big Mike 49 said: What is it that the L98 long block has that the Cross Fire Block doesn't ?

An intake manifold that doesn't cover half of the intake port, for one. Approve

The question from the OP was, will the L98 FIT. The answer is, it will, but the ECM and wiring will need to be changed/modified, and possibly some inner hood mods.
I suggested simply installing the Crossfire intake on the L98 long block so no major mods would be needed. Big smile

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Joel Adams
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Re: Will an '89 L98 TPI fit in the '84 (8/14)
8/12/13 10:41pm

TVaitonis
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Rochester, NY - USA

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1987 Coupe Red and red, Z52

Joined: 8/20/2011
Posts: 60

The Cross Fire was a carry over from the last of the C3's in 1982. Since Chevy already skipped the '83 MY they couldn't wait any longer and had to launch the C4 with CrossFire. The original plan was the L98 TPI. Years ago I borrowed a friends '82 and while it wasn't a neck snapper the CrossFire ran beautiful. Just the maze of sensors that TPI needs is a project itself to get them all there and wired. If I were to consider an engine swap, I'd go for an LS1 install and buy one of the dedicated ECM harnesses.

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Re: Will an '89 L98 TPI fit in the '84 (9/14)
10/30/13 2:01pm

Mike2977
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Oviedo, FL - USA

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1984 Resto-Mod Corvette coupe. Featured in America's Sports Car as the 1984 model.

Joined: 10/30/2013
Posts: 15

That's why I chose to go to the LS-1, even with a low mileage Crossfire engine in my '84. I've spent a ton of money trying to get it tuned properly to trust it on cruises and caravans. If I were only going to local shows, I'd live with it, but I'm getting a nice package from a West Coast supplier (not sure I can post a link to his site, but PM me for info if you like.) Here's what it is supposed to look like with the chrome package I've ordered:

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Re: Will an '89 L98 TPI fit in the '84 (10/14)
10/30/13 2:35pm

martone_1
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Fernandina, FL - USA

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1985 Corvette Coupe

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Posts: 109

The only issue i've heard on the cross fire was that at the time they had to use two chevette TPI. units that work well but not a lot of airflow, an easy way to make up for this instead of replacing everything mabee buy a couple of the new Edelbrock TPI units and try that. had a friend do it and he loved it. Just a thought.

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Re: Will an '89 L98 TPI fit in the '84 (11/14)
10/30/13 8:18pm

TVaitonis
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Rochester, NY - USA

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1987 Coupe Red and red, Z52

Joined: 8/20/2011
Posts: 60

Something that a later L98 does offer up is roller lifters. A minor HP gain. Maybe 5-10 more. I myself? If I really needed to rebuild the powerplant I might go the 383 route with a higher flowing TPI. The low end grunt is pretty addictive.

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Re: Will an '89 L98 TPI fit in the '84 (12/14)
10/30/13 10:47pm

The throttle bodies on the Crossfire were originally Cadillac units....not Chevette. Wink

The Crossfires can be a handful to properly tune/diagnose, but the basic engine was, and still is a good foundation. It's the intake manifold that kills it, plain and simple. A decent intake that won't cover up half of the intake ports in the heads would wake the engine right up....but then the hood wouldn't close.... Ouch

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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Re: Will an '89 L98 TPI fit in the '84 (13/14)
11/2/13 8:06am

martone_1
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Fernandina, FL - USA

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1985 Corvette Coupe

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Posts: 109

Adam I have the corvette fuel injection book from the engineer that did alot of the Corvette stuff and that is what he said in the book that the throttle bodies were from chevette. So I wasnt just saying that to be saying that.

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Re: Will an '89 L98 TPI fit in the '84 (14/14)
11/2/13 12:08pm

jazzin11
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Bellingham, WA - USA

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'84 Z51 C4, 59K, Stock except for Magnaflow Exhaust (too darned loud!)

Joined: 11/2/2013
Posts: 1

Hmmm, I've had three crossfires in the past including my current one. My '82 ran really well, but was well, kind of a dog. It became master's degree tuition. My first'84 (bought new) ran extremely well until I sold it at 101k to buy a house. My current one with 59k is also an excellent runner, but I would like just a little more oomph. The idea of the larger Edelbrock TB's is intriguing...I will have to look into it! I love C4's!!

|UPDATED|11/2/2013 9:08:48 AM (AZT)|/UPDATED|

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