L98 Info needed
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,601
Likes: 4
From: Texas
L98 Info needed
Hello C4 compadres... Im normally found in the C2 section.
I was on the Jim Pace GMPP website earlier today and found
a shortblock listed as a L98/L05 shortblock with 2 bolt mains
listed for $869.... delivered with free shipping...
It's a little irritating that the internals are not described on the
description page...hence Im showing up over here with questions..
Is this shortblock going to have a forged crank??...did L98's,in fact,
come in the 2 bolt variety??... I'm just a little curious...
If the crank is forged, and shipping is free, and you're building
525hp or less.... this seems like a hell of a buy....
A regular bare ZZ4 block cost basically the same money...
Anyway....Im trying to de-cifer the assemblies make up without
having to go down to the Chevy dealer...
The short block is GM Part number 12510735
I was on the Jim Pace GMPP website earlier today and found
a shortblock listed as a L98/L05 shortblock with 2 bolt mains
listed for $869.... delivered with free shipping...
It's a little irritating that the internals are not described on the
description page...hence Im showing up over here with questions..
Is this shortblock going to have a forged crank??...did L98's,in fact,
come in the 2 bolt variety??... I'm just a little curious...
If the crank is forged, and shipping is free, and you're building
525hp or less.... this seems like a hell of a buy....
A regular bare ZZ4 block cost basically the same money...
Anyway....Im trying to de-cifer the assemblies make up without
having to go down to the Chevy dealer...
The short block is GM Part number 12510735
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Most guys use the ZZ4 shortblock as the replacement for their L98. They were all 2 bolt mains, cast cranks. One or two piece main, roller or non is what you need to look into.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
block
1985= standard gen 1 chevy 2 bolt main block
1986= standard gen 1 chevy 2 bolt main block, add 1 piece seal, right hand dipstick
1986 1/2 = same as above, but adds aluminum heads (cast iron clones),
1987 = same as above except adds roller cam, lifters, spider, center bolt covers
1988 = same as above except better alum. head combustion chamber
1989 = 4 bolt block, roller cam, 58 cc D port heads, 1 piece seal, dished pistons, center bolt rocker covers, windage tray
1990-1991 same as 1989
If they claim it is an L98, and it has 4 bolt block, it is the latest version
1986= standard gen 1 chevy 2 bolt main block, add 1 piece seal, right hand dipstick
1986 1/2 = same as above, but adds aluminum heads (cast iron clones),
1987 = same as above except adds roller cam, lifters, spider, center bolt covers
1988 = same as above except better alum. head combustion chamber
1989 = 4 bolt block, roller cam, 58 cc D port heads, 1 piece seal, dished pistons, center bolt rocker covers, windage tray
1990-1991 same as 1989
If they claim it is an L98, and it has 4 bolt block, it is the latest version
Last edited by coupeguy2001; Apr 8, 2007 at 11:13 PM. Reason: add info
Team Owner
Joined: Sep 2001
Posts: 62,140
Likes: 1,729
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
1986 1/2 = same as above, but adds aluminum heads (cast iron clones),
1987 = same as above except adds roller cam, lifters, spider, center bolt covers
1988 = same as above except better alum. head combustion chamber
1989 = 4 bolt block, roller cam, 58 cc D port heads, 1 piece seal,
1987 = same as above except adds roller cam, lifters, spider, center bolt covers
1988 = same as above except better alum. head combustion chamber
1989 = 4 bolt block, roller cam, 58 cc D port heads, 1 piece seal,
Center bolt covers started with these heads, 86L, not 87.
1988 got the D-port head with the major design feature an improved exhaust port over the '128.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
I was on the Jim Pace GMPP website earlier today and found
a shortblock listed as a L98/L05 shortblock with 2 bolt mains
Is this shortblock going to have a forged crank??...did L98's,
in fact, come in the 2 bolt variety?
Anyway....I'm trying to decipher the assemblies make up without
having to go down to the Chevy dealer.
The short block is GM Part number 12510735
a shortblock listed as a L98/L05 shortblock with 2 bolt mains
Is this shortblock going to have a forged crank??...did L98's,
in fact, come in the 2 bolt variety?
Anyway....I'm trying to decipher the assemblies make up without
having to go down to the Chevy dealer.
The short block is GM Part number 12510735
2-bolt mains, a 1-pc rear main seal and provisions for a roller cam. I do
not KNOW but I suspect it does NOT have provisions for a mechanical
fuel pump.
Crank: 12556307
Rods: 10108688
Pistons: 10159436
The ZZ4 comes with the 1053 forged crank, p/n #12556307. I believe
it DOES have provisions for a mechanical fuel pump.
.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
The 1990-1991 engines are different from the 1989. One instance of
the changes is that the '89 pistons are dished and compression is 9.5:1.
In '90, pistons became flat-tops and compression increased to 10.25:1.
There were other modifications besides this.
.
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Burning Brakes
Joined: Aug 2005
Posts: 1,172
Likes: 9
From: '88 TPI L98/HotCam Powell, Ohio
I just bought that short block a couple of weeks ago and everything Slalom said above is on the money. It's the poor mans ZZ4. Cast crank and 2 bolt mains vs. forged crank w/ 4 bolt on the ZZ block. I'll be under 400 hp so I'll save the $1200+ diff. I believe the pistons are the same in the ZZ and L98 replacement block. (Hypers w/ -4cc)
I'm a little behind in my project but hopefully I'll have a full report by the end of the month.
It does not have provisions for a mech fuel pump.
I'm a little behind in my project but hopefully I'll have a full report by the end of the month.
It does not have provisions for a mech fuel pump.
Last edited by mrc24x; Apr 9, 2007 at 09:58 AM.
Thread Starter
Drifting
Joined: Nov 2005
Posts: 1,601
Likes: 4
From: Texas
Thanks for all the information..... when I saw the L98 designation and the
price my radar went on Alert.
I was hoping it had a forged crank... if that had been the case I would
have struck hard on that deal...
The free shipping is still a tasty perk...especially with heavier parts
like engines or heads... and the Prices are competitive with other
GMPP dealers who charge shipping
price my radar went on Alert.
I was hoping it had a forged crank... if that had been the case I would
have struck hard on that deal...
The free shipping is still a tasty perk...especially with heavier parts
like engines or heads... and the Prices are competitive with other
GMPP dealers who charge shipping