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Thread: VT 5L Block

  1. #1
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    Default VT 5L Block

    Im about to start a new engine build for my commodore and aiming to go faster again than the old setup, so im looking at building a engine with 4 bolt mains caps etc. Anyway ive picked up a complete VT 5L sedan cheap which had a noisy lifter and ive pulled it down and the block looks pretty good still std bore. Is there any benefits or problems eg core shift with a VT block?
    Are there any other differences with VT blocks other than the roller lifters and stroker clearance?

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    Engine number prefix is different.
    The stroker clearance for the 5.7/350 isn't a difference, that started mid VR.

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    Lifter bores are taller on VT for the roller lifters. If going 4-bolt then it must be fairly serious. A sonic check is mandatory. I had 2 late model blocks fail a sonic check before getting a good VP block. The theory is that the LS1 wasn't far away and maintenance in the foundry was a bit lax leading to core shift on some. On one std bore on a late model block I had less than 2mm thick on one side and 7mm the other.

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    Quote Originally Posted by RedTaxi View Post
    The theory is that the LS1 wasn't far away and maintenance in the foundry was a bit lax leading to core shift on some.
    Do you want to tell him to go LS or shall I? lol

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    First of the LS had all sorts of re-call issues. Floppy pistons and the like. I'll let you tell him.

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    Quote Originally Posted by paulzig View Post
    Do you want to tell him to go LS or shall I? lol
    Lmfao


    Sent from my iPhone using Tapatalk

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    Quote Originally Posted by Paul355 View Post
    Im about to start a new engine build for my commodore and aiming to go faster again than the old setup, so im looking at building a engine with 4 bolt mains caps etc. Anyway ive picked up a complete VT 5L sedan cheap which had a noisy lifter and ive pulled it down and the block looks pretty good still std bore. Is there any benefits or problems eg core shift with a VT block?
    Are there any other differences with VT blocks other than the roller lifters and stroker clearance?
    What are you going to do with it? How much power are you aiming for and what is your budget?

    Sent from my SM-G930F using Tapatalk

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    Quote Originally Posted by Paul355 View Post
    Im about to start a new engine build for my commodore and aiming to go faster again than the old setup, so im looking at building a engine with 4 bolt mains caps etc. Anyway ive picked up a complete VT 5L sedan cheap which had a noisy lifter and ive pulled it down and the block looks pretty good still std bore. Is there any benefits or problems eg core shift with a VT block?
    Are there any other differences with VT blocks other than the roller lifters and stroker clearance?
    Vn, vp blocks generally sonic test thicker.
    Vt heads have different combustion chambers and are generally avoided for full port jobs.
    But, be prepared to source a few engines as good ones are getting hard to find, so if the vt engine tests ok (100 thou plus on non thrust side of cylinder,220 thou plus on thrust side, and head pass crack test) use that.

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    the old motor was making around 700, 6500rpm. the ol 2 bolt was walking around (to be expected) and the scat snapped, with no support (also expected, and the limit was found, lol.) im know this will still be run with the vortech, im thinking Paul is wondering will 4 bolt, cast scat crank, crank support, what would the rpm ceiling be? it'll probably need a few oiling mods too, and power? another 100 i'd say
    p.b. 10;78@ 123.19mph. never late with a 308

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    Quote Originally Posted by paulzig View Post
    Do you want to tell him to go LS or shall I? lol
    that has been joked about but thats the easy way out, much more satisfying, with holden power
    p.b. 10;78@ 123.19mph. never late with a 308

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    Quote Originally Posted by Str8upal View Post
    Vn, vp blocks generally sonic test thicker.
    Vt heads have different combustion chambers and are generally avoided for full port jobs.
    But, be prepared to source a few engines as good ones are getting hard to find, so if the vt engine tests ok (100 thou plus on non thrust side of cylinder,220 thou plus on thrust side, and head pass crack test) use that.
    For those not wanting LS1 and for the bigger power Holden style engines, would people consider the Little Paw? I understand the block is down to around $6700ish now. I paid more prepping my block.
    What are your thoughts Paul355? What does anyone think?

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    Probably a good insurance policy for those wanting to push more than 600 +hp, for more than one meeting.

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    Quote Originally Posted by narva*2010 View Post
    For those not wanting LS1 and for the bigger power Holden style engines, would people consider the Little Paw? I understand the block is down to around $6700ish now. I paid more prepping my block.
    What are your thoughts Paul355? What does anyone think?

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    They should just recast the L.P. Group A blocks again. Light and plenty strong.
    Ls are no stronger then the plastic unless sleeved.
    $6700 for a heavy cast iron block that you can't use in most circuit racing classes, no thanks.

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    All of the serious circuit muscle cars over here are using the new T/P block now. They have been allowed so they can compete with the old Chevs and Fords which all run Nascar engines.
    I thought the T/P blocks were more like 5k?
    A good Holden block all prepped up is still cheaper, but not as strong.

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    If you don’t want to go LS and want big power why run a GMH style engine when you can run a SBC? I’m talking about starting from scratch, understand if you have all the goodies for a GMH block already.

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