L98 Buildup questions
Thread Starter
Heel & Toe
Joined: May 2008
Posts: 22
Likes: 0
L98 Buildup questions
I am currently building up the tired old L98 in my 1990. I ordered up the cast iron vortec heads (more flow at a great price). A half-inch comp cam valvetrain kit, and I'm planning on swapping the tpi out for a carburated setup (much more cost effective...even if the gas mileage is gonna suck.) I'm just wondering if you guys have any other suggestions for what I could add into this build up.
p.s. I have about a grand left in my budget.
p.s. I have about a grand left in my budget.
Thread Starter
Heel & Toe
Joined: May 2008
Posts: 22
Likes: 0
I checked on the manifold and runner from TPiS. They want 475 for the runners and about 375 for the manifold. Plus with the cam and heads it's gonna cost about 600 for a custom ecu chip. That's really one of the biggest things that pushed me towards just doing the carb setup. I do appreciate the input though, thanx.
I don't spose you would know what kind've fuel pump I would need, sayin that I were to get a 650 cfm?
I don't spose you would know what kind've fuel pump I would need, sayin that I were to get a 650 cfm?
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Just ported a set of Iron Vortecs, they are being flowed.
Heard good things about them, we will see.
Sure you are aware you lose your EGR, right?
If you can use a manual FP I have a brand new Holley HP mech pump in the box I cant use....
Heard good things about them, we will see.
Sure you are aware you lose your EGR, right?
If you can use a manual FP I have a brand new Holley HP mech pump in the box I cant use....
Thread Starter
Heel & Toe
Joined: May 2008
Posts: 22
Likes: 0
I'll check about the pump. If I can use it than I'd definitely be interested in buyin that pump off ya.
Also, what would be a good gear ratio to go with for my 1990 w/6-speed?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Heel & Toe
Joined: May 2008
Posts: 22
Likes: 0
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
I checked on the manifold and runner from TPiS. They want 475 for the runners and about 375 for the manifold. Plus with the cam and heads it's gonna cost about 600 for a custom ecu chip. That's really one of the biggest things that pushed me towards just doing the carb setup. I do appreciate the input though, thanx.
I don't spose you would know what kind've fuel pump I would need, sayin that I were to get a 650 cfm?
I don't spose you would know what kind've fuel pump I would need, sayin that I were to get a 650 cfm?
Just keep running the stock pump. I used the mallory regulator with return and have a constant 6psi to the carb.
Pro
Joined: Jan 2008
Posts: 584
Likes: 1
From: Near Lockport NY Black 1986 Coupe
I plan on swapping out to carb as well, but would suggest higher than 650cfm. Get a 750 double pump and jet it down, just incase you plan on going higher numbers down the road.
How do those heads flow at 6k+ RPM?
How do those heads flow at 6k+ RPM?
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
I juiced my 86 l98 to 150 shot before I blew it .
Best thing that ever happened to that motor
.
I have a 434 in it now and a built 700r4 and carcreations rear running 9's.
Just a little u u unfriendly on the street
.Best thing that ever happened to that motor
.I have a 434 in it now and a built 700r4 and carcreations rear running 9's.
Just a little u
u unfriendly on the street
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
I run a 750 on my 454 and it feeds it fine so the 650 should be plenty
Instructor
Joined: Dec 2006
Posts: 195
Likes: 0
From: Savannah Georgia
I know in our 90 L98s we have forged flat top pistons that boosted the compression to 10.25:1, I have a buddy that runs a 75 shot on his 91 stock bottom which is the same as the 90 and hasn't had any problems
