C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

L98's all 2 bolts?

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Old 12-23-2007, 04:20 AM
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86GoldProject
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Default L98's all 2 bolts?

Is it true that all L98 engines are 2 bolt main? I always though that vette L98's have 4 bolt mains..
Old 12-23-2007, 06:52 AM
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rodj
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L98 are 2 bolt; think the '84 engines (crossfire ) were the last of the 4 bolt mains
Old 12-23-2007, 08:58 AM
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Z51L9889
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Old 12-23-2007, 10:52 AM
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Keystring
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Originally Posted by rodj
think the '84 engines (crossfire ) were the last of the 4 bolt mains
Nope.

My 84 has 2 bolt mains as well.
Old 12-23-2007, 11:27 AM
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pmihaltian
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To my knowledge, all L98s have two-bolt main bearing caps.

Last edited by pmihaltian; 12-26-2007 at 05:38 PM. Reason: clarity
Old 12-25-2007, 11:05 PM
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Johns87
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Why Care?

Back in the day, That mattered. Who has heard of a main-cap failure since the one-piece seal/High-nickel blocks came on the scene?
You can always buy aftermarket caps(Milodon, i think) and pay for the work to be done. How many LT-1's and LS-1's with two bolt caps have revved real high...with no issue.

You All Take Care and be Safe, -John


PS: I understand that there are some 'late-model' truck Vortec blocks that do have the 4-bolt mains, though.
Old 12-25-2007, 11:32 PM
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all show and more go
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Originally Posted by Johns87
Why Care?

Back in the day, That mattered. Who has heard of a main-cap failure since the one-piece seal/High-nickel blocks came on the scene?
You can always buy aftermarket caps(Milodon, i think) and pay for the work to be done. How many LT-1's and LS-1's with two bolt caps have revved real high...with no issue.

You All Take Care and be Safe, -John


PS: I understand that there are some 'late-model' truck Vortec blocks that do have the 4-bolt mains, though.
Old 12-25-2007, 11:47 PM
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zr1fred
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I dono, I've always heard 4 bolt blocks gave you an extra 40 hp.
Old 12-26-2007, 01:14 AM
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rube1975
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i probally wrong but i though one of the LSx blocks where 6 bolt?!? maybe LS7 not sure though.
Old 12-26-2007, 01:40 AM
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yes, the LSx bottom ends are extremely strong, excellent design.
Old 12-26-2007, 07:42 AM
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aboatguy
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Originally Posted by 86GoldProject
Is it true that all L98 engines are 2 bolt main? I always though that vette L98's have 4 bolt mains..
Nope L98 = 2 bolt however, Y body LT1/4 = 4 bolt but the F-body LT1 = 2 bolt (there are some F body exceptions)


Face it a factory L98 was rpm challenged and didn't need 4 bolt mains.

If your ditching the TPI and building a screamer a 2 bolt main block is a better proposition than factory 4 bolt since you can go for splayed main caps.
Mike
Old 12-26-2007, 08:13 AM
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Matt Cramer
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Originally Posted by rube1975
i probally wrong but i though one of the LSx blocks where 6 bolt?!? maybe LS7 not sure though.
You got it - they have four vertical and two horizontal bolts per cap on the LS1s.
Old 12-26-2007, 11:09 AM
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Although not directly delivered from GM this way, Callaway Twin Turbo B2K cars have a 4 bolt splayed setup. This was done at the Callaway facility.
Old 12-26-2007, 12:32 PM
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Demonic85
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I didnt know L98's were 2 bolt mains. Not all L98's have a one piece rear main seal, my '85 doesnt. BTW all LSx engines are 6 bolt mains.
Old 12-26-2007, 09:08 PM
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Johns87
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One quick follow-up. The number of main cap bolts has nothing to do with power.

"...heard 4-bolt mains are worth 40 HP.."

The mains/bolts are only for bottom-end longevity. They, in and of themselves, have NO effect on horse-power.
You All Take Care and Be Safe, -John
Old 12-26-2007, 09:20 PM
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RollaMo-LT4
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Originally Posted by Johns87
One quick follow-up. The number of main cap bolts has nothing to do with power.

"...heard 4-bolt mains are worth 40 HP.."
I do believe that was posted with a little bit of sarcasm.
Old 12-27-2007, 12:09 AM
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Johns87
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None Intended.
I did not intend anything as such. That is why I did not make any reference to anyone nor any post. If I offended anyone, I am sorry for that because that was not my intention.

My Intention was to clarify a small issue, so no-one spent money they did not need to spend. If their combination would be fine with a two bolt main block, I didn't want anyone thinking they needed a 'better' block because it would make any more power for them.

Once again, I did not mean any offense to anyone and if I did, I apoligize for it. I have been the person who wasn't sure and did not want anyone (who was unsure) to spend any of their 'performance' budget on something for no power gain.

You ALL Take Care and Be Safe, -John

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Old 12-27-2007, 01:18 AM
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rodj
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Originally Posted by Johns87
None Intended.
I did not intend anything as such. If I offended anyone, I am sorry for that because that was not my intention.
The sarcasm part was refering to the original 40Hp post ; not yours.
Old 12-27-2007, 01:45 AM
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cv67
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No offense taken John, theres plenty of sarcasm and humor here, youll get used to it. Its a fun loose knit group nobody is flaming ya.
Old 12-27-2007, 09:30 AM
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Originally Posted by Johns87
None Intended.
I did not intend anything as such. That is why I did not make any reference to anyone nor any post. If I offended anyone, I am sorry for that because that was not my intention.
Sorry John, As rodj said I wasn't refering to your post.
I should have clarified that more.


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