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#1 |
Registered User
Join Date: Sep 2018
Location: Reno
Posts: 58
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Anyone swap in an lt1 with the original sm465?
I have a low mileage '95 z28 sitting in my yard that a co worker gave me. It runs great but has body/interior issues. Anyway, I am planning on putting the lt1 into my '72 k20. It has a sm465/205 combo in it that is going to stay in it. I will be on a time crunch to get it installed, so I could use any advise as to if there is any real differences between the original small block and the lt1 as far as mounting goes, specifically with the manual clutch linkage and flywheel/starter. The camaro is a manual trans, so it already has a flywheel, but I do not know if it will work for my application. Thank you in advance for any help.
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#2 |
Registered User
Join Date: Apr 2008
Location: Md
Posts: 2,471
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Re: Anyone swap in an lt1 with the original sm465?
Good bit of info here, older TBI but pretty much the same tech wiring etc to swap over.....https://67-72chevytrucks.com/vboard/...d.php?t=352321
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http://67-72chevytrucks.com/vboard/s...d.php?t=635605 |
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#3 | |
Registered User
Join Date: Sep 2018
Location: Reno
Posts: 58
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Re: Anyone swap in an lt1 with the original sm465?
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#4 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,901
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Re: Anyone swap in an lt1 with the original sm465?
I don't know all the answers you're looking for, but I can supply a couple of pieces...
The 1-piece rear main seal crankshaft requires a different flywheel than the old 2-piece used. You have a flywheel, but I don't know if it will work. I would measure the diameters and thicknesses of both, and that should get you in the ballpark. The 95 uses a hydraulic clutch, and your truck has a mechanical clutch. The question I would have about that is whether there is a boss for mounting the Z bar on the LT1 block. I don't think there is, but my 95 Z28 is an automatic, so I'm not sure. In any case, I don't think this is going to be a quick and easy swap.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#5 |
Registered User
Join Date: Jul 2019
Location: aurora
Posts: 7
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Re: Anyone swap in an lt1 with the original sm465?
I am currently putting a 97 vortec 5.7 in my 72 k10. It has the hole in the block for the ball stud. Mine has been converted to hydraulic clutch but the mechanical linkages would work.
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#6 |
Senior Member
![]() Join Date: Jul 2015
Location: Warrenton VA
Posts: 1,050
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Re: Anyone swap in an lt1 with the original sm465?
The LT1 block is different than your typical vortec roller block of the same era. You'll need the motor mount clam shells off the camaro as they mount different than the SBC, same location, but the bosses on the block are different. Not sure if you'll have provisions for a z bar. Check out LS1Tech for a TON of info on the LT1. Also LT1swap.com might have some more info as well. Keep that t-56, people pay for them, granted they pay more when they are set up for LS but they still bring money. I'm a member over at LS1tech and there's a wealth of info there on the 4th gen f bodys. I have a 95 I pulled the Lt1 4l60 out of and have put in a 350 and now a SBC 427 TH350 combo in.
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71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350 |
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#7 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,104
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Re: Anyone swap in an lt1 with the original sm465?
You also might try looking over on the Pirate 4x4 forum. Lots of LS powered crawlers and other off road trucks over there.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#8 |
Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
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Re: Anyone swap in an lt1 with the original sm465?
The boss for the clutch ball on a 4wd is forward of the rear boss used in 2wd because the engine sits back further in a 4wd. Your late model LT 1 may have that boss. If it does, it can be drilled and tapped. The first LT 1’s were gen 1 350’s which would have matched up all ways. Later model LT 1’s have differences as you are noting.
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1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 |
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#9 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,149
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Re: Anyone swap in an lt1 with the original sm465?
Pretty sure the 6-speeds have a different clutch type than an old 4-speed. I think you can use a Vortec 4.3 or 5.7 Flywheel for a 5-speed with the pressure plate for the late truck and a disc for your original truck. Just be sure that they are the same diameter.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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