l98 - CorvetteForum - Chevrolet Corvette Forum Discussion

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1, 1990, air, box, camshaft, corvette, diameters, l98, lt5, max, oil, optimum, plenum, psi, specs, stage

Sticky

Tech Info - LT5 Modifications/Rebuild Tricks (500+hp)

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Dynomite on Feb 20, 2012

Mar 12, 2026 01:40 PM
by Dynomite

339

535,220

C4 ZR-1 Discussion

90, 98, bolt, c4, center, chevy, corcette, corvette, covers, l98, valve

L98 Center Bolt Valve Covers

vettman31 on Oct 30, 2011

Dec 23, 2025 11:30 AM
by Sabre34

7

2,160

C4 Parts for Sale/Wanted

85, c4, corvette, l98, location, o2, restoring, sensor, sensors

Is there one or two o2 sensors 0n '85 L98

mikeysee1 on Oct 24, 2009

Dec 20, 2025 04:46 PM
by judy marie

8

1,807

C4 Tech/Performance

c4, control, corvette, engine, fault, gm, high, l98, line, lt1, lt5, minimum, octane, optispark, requirements, sencors

Does anyone know the history of the Optispark?

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1 2)

Mr. Peabody on May 10, 2008

Aug 20, 2025 11:04 AM
by bb62

29

21,603

C4 General Discussion

420, 420ci, 525, 540, c5, conversion, corvette, l98, lingefelter, lingenfelter, lpe, ls1

C5 guys needs advice on Lingenfelter LPE 420ci L98 project.

IFLUBYU on Sep 18, 2006

May 30, 2025 09:55 AM
by aucjo01

19

2,820

C4 Tech/Performance

air, beating, c5, corvette, delete, l98, las, pass, pay, places, pump, smog, test, vegas

Can you beat the smog test w/no air pump?

Southern Comfort on Jun 1, 2003

Feb 11, 2025 03:09 PM
by Mitchellbandur7

6

1,620

C4 Tech/Performance

1976, 82, ac, braket, buy, corvette, delete, heads, homemade, l98, lt1, pulley, smog, tpi, vette

Those who have deleted the AC without a delete pulley

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mseven on May 7, 2008

Jan 5, 2025 03:30 PM
by AZSP33D

114

57,311

C4 Tech/Performance

angle, assembled, center, chevy, dead, engine, find, finding, heads, l98, lt1, plug, removing, tdc, top

How to find TDC without tearing down

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1 2)

The Bus on Sep 30, 2007

Dec 16, 2024 05:55 PM
by Sabre34

24

5,415

C4 Tech/Performance

1984, 85, c4, chip, corvette, corvettes, hp, jet, kit, kits, l98, manifold, single, turbo, twin, wwwhpturboscom

they have a turbo kit for C4..

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1 2 3)

red L98 on Mar 21, 2006

Sep 24, 2024 06:34 PM
by Sabre34

51

42,087

C4 Tech/Performance

ac, c4, corvette, delete, install, l98, vette

TPIS A/C delete for 88-91 L98

Firevette on Oct 6, 2009

Sep 8, 2024 05:31 PM
by Topduarte

5

2,305

C4 Parts for Sale/Wanted

85, c4, corvette, hard, hot, intermittent, l98, start, starting

Sometimes hard starting 89 L98 with 140,000 miles

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1 2)

jzvette on Jun 1, 2005

Jun 6, 2024 12:22 PM
by Seahunt73

33

3,322

C4 Tech/Performance

12556121, 1985, 1990, 87, buy, c4, corvette, crate, create, engine, engines, info, l98, motor, remanufactured, upgrade

L98 Crate Engine

ejscarfo on Mar 7, 2007

May 7, 2024 07:34 PM
by jazfe

17

25,065

C4 Tech/Performance

corvette, drive, forum, l98, overdrive, shifting, timing

L98 - "Drive" or "Overdrive" ?

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1 2 3)

DonRich90 on Oct 7, 2002

Apr 8, 2024 05:34 PM
by Sabre34

42

7,639

C4 General Discussion

2001, chip, copy, corvette, engine, headers, horse, horsepower, hp, improving, l98, motor, power, swap, tips

Horsepower for a L98 engine

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1 2 3)

michelc4 on Mar 31, 2003

Mar 21, 2024 05:56 PM
by Dacer Spears

48

19,981

C4 Tech/Performance

189133gs, air, c5, corvette, fuel, l98, r12, rail, schrader, shrader, size, stem, thread, type, valve

Fuel Pressure Schrader Valve - Thread type and size

pletzvet on Dec 23, 2009

Mar 21, 2024 03:03 PM
by WVZR-1

9

7,765

C4 Tech/Performance

1989, 89, corvette, distributer, distributor, gm, hole, l98, leak, leaks, manifold, oil, pressure, top, wet

Oil leak behind the distributor on '89 L98?

TheCorvetteKid on Jul 16, 2005

Mar 6, 2024 05:34 PM
by Sabre34

9

4,255

C4 Tech/Performance

9296, 98, c4, correct, corvette, corvetteform, diameter, exaust, exhaust, frisbee, jets, l98, set, size, system, xpipe

Best Exhaust Option For L98?

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1 2)

mash2k on Aug 3, 2005

Oct 30, 2023 10:26 AM
by stonesnpebbles

26

18,552

C4 General Discussion

30, 4bbl, bore, c4, corvette, crossfire, gained, hp, injection, intake, l98, lid, manifold, ported, spacer

L98 Crossfire!?

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1 2)

Lionsden on Jul 26, 2003

Oct 27, 2023 08:39 AM
by Highwayman9011

22

4,071

C4 Tech/Performance

90, check, corvette, crankcase, engine, headgasket, l98, pcv, pressure, pvc, system, tuneport, valvas, valve, valves

Are we supposed to have two PCV valves on our L98 engines?

Rob 93ZR-1 on Dec 30, 2003

Oct 24, 2023 05:36 PM
by Sabre34

9

10,379

C4 Tech/Performance

1989, 86, corvette, eratic, fluctuating, gm, hunting, hunts, idle, inconsistant, l98, ls1, multec, tps, unstable

Hunting, fluctuating, erratic idle

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1 2)

Jinxie on Sep 14, 2008

Oct 5, 2023 06:26 PM
by Sabre34

21

4,656

C4 Tech/Performance

accessories, c3, car, forum, forums, heads, l98

l98?

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1 2)

weaselbeak on Mar 23, 2012

Oct 2, 2023 01:29 PM
by sahhas

22

8,891

C4 General Discussion

88, 98, aus, c4, check, compression, corvette, engine, geht, l98, psi, removed, spec, test, tester

'88 L98 compression check question.

65Z01 on Apr 16, 2002

Apr 8, 2023 11:15 PM
by Marknangela

10

6,047

C4 Tech/Performance

L98 vs LT1

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wmrobert on Nov 19, 2002

Apr 1, 2023 07:53 AM
by Sabre34

62

44,669

C4 Tech/Performance

buy, car, engine, install, l98, lufkin, mi, nitrous, nos

L98 Nitrous install part one. (Lots of PICS)

skateparkdave on Feb 9, 2005

Jan 16, 2023 09:26 PM
by CorvetteRules

11

2,595

C4 Tech/Performance

85, bad, corvette, failure, filter, fuel, l98, location, o2, oil, pressure, pump, sensor, switch, symptoms, work

85 corvette died, code 44

buzzbomb on May 8, 2010

Dec 18, 2022 05:34 PM
by Sabre34

14

5,786

C4 Tech/Performance

1984, 1985, 1988, 98, corvette, fuel, gas, grade, l98, octane, recommendations, requirement, requirements, type, use

85 L98 fuel octane requirement

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1 2)

ghlkal on Aug 27, 2005

Dec 15, 2022 05:50 PM
by Sabre34

34

24,257

C4 General Discussion

bad, control, counts, crossed, dies, knock, l98, like, scanner, sensor, showing, shows, sound, sounds, wire

What does it sound like when a knock sensor dies?

quickcat on Sep 12, 2010

Oct 10, 2022 02:08 AM
by drcook

8

2,923

C4 Tech/Performance

083, 113, 1989, 85, 882, 91, aluminum, bigger, cast, corvette, flow, heads, iron, l98, valve, vette

L-98 cast heads vs aluminum

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1 2)

samdweezel05 on Mar 12, 2009

Sep 23, 2022 03:30 PM
by THE 383 admiral

26

27,830

C4 Tech/Performance

199091, 1991, c4, corvette, diy, fix, l98, mirror, repairs, reset, side, speedometer, switch, vat, yroubleshooting

Sticky

The Ultimate C4 DIY thread.... write ups w/ pics..

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1 2 3 ... Last Page)

socalman on Jul 27, 2010

Sep 22, 2022 04:30 PM
by Dacer Spears

79

264,886

C4 General Discussion

1989, 240, build, camshaft, corvette, custom, engine, flow, ground, high, hp, l98, runners, slp, zz9

L98 Engine Mods - What works?

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Quinny on Jul 12, 2009

Sep 6, 2022 08:28 PM
by ghoastrider1

99

67,101

C4 Tech/Performance

98, ats, corvette, diference, difference, engine, engines, hp, l98, lt1, mn, optispark, reliable, sale, wisc

Difference between an LT1 & L98?

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1 2 3)

MeanMachine350 on Jun 20, 2011

Aug 26, 2022 03:28 AM
by convas

57

79,806

C4 Tech/Performance

1990, c4, common, corvette, engine, head, intake, l98, leak, leaking, leaks, locations, manifold, problems, seal, water

L98 Intake Manifold Water Leaks....Common Problem???

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1 2)

Five Window on Nov 21, 2002

Aug 9, 2022 02:56 PM
by SpikeD33

32

10,496

C4 Tech/Performance

46, 91, blue, car, code, corvette, dark, ecm, engine, esc, l98, mode, safe, system, troubleshooting, wire

91 L98 Diagnoses Help: Code #43 & #46

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1 2)

DavesC4 on May 14, 2009

Jul 17, 2022 08:18 PM
by drew915

25

4,063

C4 Tech/Performance

1990, air, best, body, bodysize, corvette, engine, filter, induction, intake, kn, l98, stock, systems, throttle

Best air induction on a L98

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1 2)

tnz5106 on Dec 13, 2010

Jun 22, 2022 12:19 PM
by Sabre34

21

21,953

C4 Tech/Performance

85 L98 cam specs

snowmanmdp on Aug 12, 2008

Jan 15, 2022 08:24 PM
by Sabre34

5

2,443

C4 Tech/Performance

1984, 85, 86, 87, c4, cam, cast, corvette, factory, head, heads, iron, l98, spec, specs, stock, upgrades

'86 L98 Stock cam specs

Five Window on Nov 26, 2002

Jan 4, 2022 07:46 PM
by mike1111

6

8,945

C4 Tech/Performance

1984, 84, c2, c4, cooler, cooling, corvette, engine, hose, kc4, l98, lines, location, oil, option, pipe

Factory Oil Cooler on my 84??

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1 2)

gregc11514 on Aug 8, 2010

Dec 24, 2021 10:22 PM
by WVZR-1

22

8,520

C4 Tech/Performance

WTB AFR heads for l98 90 c4

Doughboy2k3 on Feb 9, 2010

Dec 19, 2021 06:02 AM
by Starlifter

7

1,105

C4 Parts for Sale/Wanted

1996, 87, body, bypass, coolant, coolent, corvett, corvette, heater, l98, line, plenum, throttle, tpi, water, zr1

Some throttle body coolant bypass questions (L98)

pzoom on Jul 15, 2002

Oct 25, 2021 01:27 AM
by Tom400CFI

16

14,636

C4 Tech/Performance

c4, capacity, corvette, l98, lt, lt5, radiator, radiators, zr1

LT1 vs ZR1 radiator, the same or different?

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1 2)

92KNGOHIL on Jan 19, 2002

Oct 2, 2021 03:31 PM
by chaley

28

5,611

C4 ZR-1 Discussion

1985, 1996, air, bad, burn, c4, corvette, flow, l98, ls1, maf, mass, module, removal, signs, symptoms

Symptoms of bad MAF Burn-Off Module

dead_elvis_187 on Mar 13, 2012

Jul 8, 2021 01:24 PM
by OldsMan

11

15,281

C4 Tech/Performance

17mm, 6speed, c3, corvette, drain, hidraulic, l98, oil, plug, put, striped, stripped, tapp, transmission, wwwhow, zf

zf 6speed drain plug stripped!!!

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1 2 3)

tombrammer on Mar 18, 2010

Jun 2, 2021 11:41 PM
by Palanon

52

10,031

C4 Tech/Performance

c4, car, cats, corvette, exhaust, garage, hollowed, l98, lt1, smell, smells, tune

exhaust smell???

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1 2)

bpdfs on Feb 17, 2010

Apr 26, 2021 07:09 PM
by rrt898

23

7,068

C4 Tech/Performance

body, bypass, c4, coolant, corvette, days, driving, engine, hose, hot, installation, l98, mod, stall, stalls, throttle, up, warm, weather

Throttle Body Coolant Bypass

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1 2 3)

coco1950 on Jan 10, 2009

Apr 11, 2021 12:03 AM
by Tom400CFI

58

22,623

C4 Tech/Performance

86, ac, air, belt, bypass, c6, coming, conditioning, corvette, eliminate, l98, pump, route, serpentine, shorter, size

A/C eliminate - belt length?

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1 2)

Z-PDX on Sep 28, 2004

Mar 24, 2021 05:32 AM
by Bill Chase

24

12,654

C4 Tech/Performance

94, bank, c4, corvette, cprvette, ecm, fuel, injector, injectors, kills, l98, pulse, receiving, short, unexpectedly

Update on fuel injector / ecm problem

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1 2 3)

DMheart on Dec 1, 2011

Mar 24, 2021 01:04 AM
by lishars

56

10,702

C4 Tech/Performance

1982, 94, air, bad, c4, caused, code, corvette, flow, hesitates, hesitation, l98, maf, mass, sensor, stop, symptoms, taking

Bad MAF = Hesitation?

Gazpar on Apr 21, 2010

Mar 20, 2021 08:06 PM
by Elijah Rodriguez

6

2,488

C4 General Discussion

Let's hear your L98 heads and cam dyno numbers

neat on May 6, 2003

Jan 20, 2021 06:00 PM
by 89onlyZ51

13

10,492

C4 Tech/Performance

1984, 1986, 1988, air, bracket, buy, c4, c5, corvette, delete, l98, pulley, pump, removal, template

Custom air pump delete bracket

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1 2)

1986-z51 on Dec 1, 2010

Dec 4, 2020 09:23 AM
by Kim Neubert

24

10,328

C4 Tech/Performance

91, c4, check, corvete, corvette, fuel, injector, injectors, l98, low, ohms, reconditioned, remove, replace, replacement

replacing injectors on 91 L98

2vettesandcounting on Aug 6, 2009

Oct 10, 2020 07:58 PM
by Calderone

17

11,754

C4 Tech/Performance

354, corvette, gear, gears, l98, ratio, speed, top

2.59 to 3.54 gear ratio - what are details?

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1 2)

87Heaven on Jul 25, 2001

Sep 2, 2020 10:55 AM
by vette196

26

7,877

C4 Tech/Performance

1987, 1994, 87, 96, c4, cap, corvette, crossfire, distributor, engine, engines, fireing, firing, l98, ndanl, order

L98 firing order

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1 2 3)

ndanl on Aug 21, 2009

Aug 31, 2020 03:28 PM
by Louie Butler

41

36,141

C4 Tech/Performance

113, c4, corvette, cost, gained, hand, headers, heads, intake, l98, polish, polished, polishing, port, ported, porting, torque

Worth it to port and polish stock L98 heads?

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1 2)

jdraughn on Mar 5, 2009

Jul 1, 2020 12:52 PM
by vette196

25

17,972

C4 Tech/Performance

383, 500, build, c4, corvete, corvette, engine, hp, l98, motor, procharger, rebuild, setup, stroker, www

L98 383 Stroker

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1 2)

drumboytroy on Apr 19, 2004

May 22, 2020 02:59 AM
by Atapia14

29

26,260

C4 Tech/Performance

1988, check, corvette, fuel, holding, l98, loss, pressuer, pressure, pump, regulator

[L98] New fuel pump and still doesnt hold pressure?

FlyboyZR1 on Oct 4, 2005

May 19, 2020 10:55 AM
by DubieDc

15

3,115

C4 Tech/Performance

383, afr, ca, cam, hot, hp, l98, legal, mini, miniram, ram, tpis, turbo, twin, zz9

Anyone running TPIS's mini ram intake on an L98?

stubbs on Oct 15, 2002

Apr 17, 2020 07:36 PM
by auburn2

15

25,586

C4 Tech/Performance

c4, cleaning, corvette, corvetteforum, engine, l98, paint, plenum, plenuum, pnenum, ported, porting, prime, rid, runners

90 L98 Plenum and Runner Porting

90C4sRule on Mar 15, 2011

Mar 29, 2020 01:38 AM
by aklim

3

2,956

C4 Tech/Performance

1984, 8688, c4, cheapest, corvette, crank, fasest, fast, fastest, fastis, hopped, l98, lt1, replace, rodspistons, stock, vette

Cheapest and Fastest C4?

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1 2 3)

eddielb96 on Nov 10, 2004

Mar 26, 2020 11:04 AM
by FAUEE

52

8,781

C4 Tech/Performance

85, 90, bolt, bolts, corvette, head, l98, length, sealant, sealer, size, torque, yield

L98 Head Bolts

dmyers on Jul 14, 2005

Mar 18, 2020 11:15 PM
by Tvette99

12

7,594

C4 Tech/Performance

1985, 1991, 79, backward, cap, chevrolet, corvette, diagram, distributor, firing, installed, l98, order, positioning, rotor

My #1 is in the wrong position on the distributor, why?

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1 2)

RED UFO on Aug 16, 2008

Feb 13, 2020 08:37 AM
by jbrianfoto

21

21,148

C4 Tech/Performance

1984, 1990, battery, car, changing, corvette, disconnect, disconnected, ecm, ecu, injectors, l98, reset, restarting

Reset ECM after injector install necessary?

(

1 2)

GKK on Aug 15, 2008

Dec 27, 2019 06:45 PM
by 95BLKVette

23

34,441

C4 Tech/Performance

1995, 95, camaro, corvette, diagram, hose, l98, line, lines, location, lt1, passenger, routing, side, vacuum

1995 Convertible LT1 Vacuum Line Routing Diagram

Freedom95 on Jun 10, 2010

Nov 19, 2019 02:13 PM
by Ron Rankin

17

44,598

C4 Tech/Performance

ac, belt, buick, bypass, c4, compressor, corvette, delete, electric, gn, l98, pulley, pump, removal, water

L98 A/C Removal Tip

rsafier on Feb 12, 2004

Oct 30, 2019 03:07 PM
by CorvetteRules

16

7,036

C4 Tech/Performance

180, 195, 210, 350, afr, bottom, cam, corvette, heads, kit, l98, performance, ring, sale, stock, zz4

AFR Heads for stock L98

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1 2 3 ... Last Page)

l98tpi on Sep 23, 2011

Sep 30, 2019 03:55 PM
by Bill Chase

100

40,937

C4 Tech/Performance

1994, 90, block, corvette, driver, drivers, ecm, engine, head, l98, location, lt1, senor, sensor, side, wire

Sensor on drivers side of block on my '90?

sexasomniac on Feb 12, 2008

Sep 17, 2019 10:52 AM
by GTO-fan

15

8,435

C4 Tech/Performance

1985, bolts, c4, coolant, corvette, engine, exhaust, install, intake, l98, leak, leaks, manifold, manifolds, smoke, start, white

Intake manifold leak. Common to L98?

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1 2)

JCAIRE2 on Sep 15, 2002

Aug 29, 2019 10:41 PM
by PacerX

20

17,438

C4 Tech/Performance

c4, corvette, engine, gas, l98, location, lt1, mileage, pcm, pcmforless, reviews, stock, tune, tuning, worth

Considering a PCMforless tune - is it worth it on a mostly stock setup?

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1 2 3 ... Last Page)

npbassman on Apr 18, 2012

Aug 11, 2019 08:00 AM
by 93 ragtop

79

23,151

C4 Tech/Performance

84, 87, corvette, engine, guage, l98, location, locations, oil, pressure, radiator, sender, sensor, switch, temp, temperature

87 L98 sensor locations

daveshea on Oct 14, 2011

Jul 29, 2019 10:53 PM
by Tact

14

12,087

C4 Tech/Performance

02, 82, bolt, c4, c6, corvette, head, header, l98, lt1, specs, torque, tourqe, z06

head bolt torque specifications

Fredbird on Apr 25, 2012

Jun 7, 2019 11:14 PM
by jv9999

10

18,796

C4 Tech/Performance

1989, 1999, 43, 89, converting, correct, corvette, distributor, electronic, find, l98, number, position, spark, weak, wheres

89 L98 - Replaced distributor - lost correct position to re-install - help!

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1 2 3)

corvette95 on Jul 6, 2011

Apr 18, 2019 11:02 AM
by 21boy

40

25,400

C4 Tech/Performance

Threads Tagged with l98