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03-03-2017
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#1 |
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Join Date: Jun 2013
Location: Toronto
Posts: 783
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LT5 Crank to Flywheel bolt pattern ??
Tried looking in the service manuals but no mention of it anywhere. I believe it was different than the LT1 bolt pattern or at least the dowel pin was in a different location etc? Will be pulling the trans and setup out soon but just wanted to ask I have a feeling someone may know !
Thx ! 
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03-04-2017
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#2 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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Re: LT5 Crank to Flywheel bolt pattern ??
LT5 has 8 bolts + dowel pin. All others have 6 + dowel pin
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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03-04-2017
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#3 | |
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Join Date: Oct 2004
Posts: 1,890
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Re: LT5 Crank to Flywheel bolt pattern ??
Quote:
The LT5 flywheel is an 8 bolt affair and you'll not mistake anything in the install. If you've bought a flywheel you should have a 9 hole flange. 8 bolts and the dowel. Less than a 9 bolt flange? You've bought or been shipped the wrong flywheel. ***Jerry was "typing" and I was thinking!!! Jerry - Not all others are 6 bolt!! I did an LSx 454 which is also an 8 bolt. I did it before specialty flywheels were an "off the shelf" and had to have one done by a specialty shop. I believe that now all LS are 8 bolt '09+ maybe. Then there's the LS9 - 9 bolt! Last edited by WVZR-1; 03-04-2017 at 08:08 AM. |
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03-04-2017
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#4 |
 
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,914
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Re: LT5 Crank to Flywheel bolt pattern ??
 
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Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
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03-04-2017
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#5 | |
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Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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Re: LT5 Crank to Flywheel bolt pattern ??
Quote:
Tells you how far I get from LT5's these days.
__________________
Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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03-06-2017
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#6 |
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Join Date: Jun 2013
Location: Toronto
Posts: 783
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Re: LT5 Crank to Flywheel bolt pattern ??
Curious if there is a pattern measurement size or something of the sort ? Like for wheels 5x4.75 etc
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03-07-2017
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#7 | |
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Join Date: Oct 2004
Posts: 1,890
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Re: LT5 Crank to Flywheel bolt pattern ??
Quote:
I've never seen a bolt circle reference for the 8 bolt LS or the 9 bolt LS9. Way back in 2010 when I did the LSX-454 it was one of the dimensions I did confirm for the fabrication. |
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03-07-2017
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#8 | |
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Join Date: Mar 2014
Location: Warrington PA
Posts: 1,914
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Re: LT5 Crank to Flywheel bolt pattern ??
Quote:
__________________
Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
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09-30-2023
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#9 |
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Join Date: Aug 2023
Location: Houston, TX
Posts: 3
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Re: LT5 Crank to Flywheel bolt pattern ??
I'm planning a 4L60 series auto trans on my 405HP LT5, prob a 70 or 75. Building a restomod 62 on a Dawson chassis with all C4 components. No racing. Need a flexplate to adapt. Pete's ZR1 Garage shows one but is he around? I got no response. I have a machine shop and can easily modify an existing flexplate but which one? Is the 8 bolt LS the same BC and I just add the dowel? What are the 2 small holes at 180 for?
Thanks, Larry lkeast@venturetechnet.com |
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09-30-2023
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#10 |
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Join Date: Nov 2018
Location: Washington
Posts: 98
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Re: LT5 Crank to Flywheel bolt pattern ??
Way back in 2010, I needed a flex plate for my LT5 in a 67 Camaro project I was doing. I was installing a 700R4 transmission behind it. At that time, a company called Street and Performance, which I think still exists, provided me with the flex plate and other parts, such as billet/polished pulleys, polished lower half of the bell housing without a provision for a starter, etc. I heard that Mark, the guy that was working with me, has passed away, but maybe they still have information or parts for your project. Good luck.
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