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11-29-2018, 02:26 AM
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#1 |
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Registered User
Join Date: Feb 2016
Location: Louisiana
Posts: 92
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8.1 engine mounts?
I removed my old 454 from my 72 GMC yet the engine mounts on the 8.1 are vastly different. I have found where people somehow used the old mounts with the 8100 vortec yet the engine mount bolt pattern on the block looks different for some reason.
Anybody know any really good engine mounts for a conversion like this? Possibly poly type? I can't find much info on the 8.1 . |
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11-29-2018, 07:30 AM
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#2 |
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SWB 4x4 Collector
 
Join Date: Jun 2001
Location: Osage City, KS
Posts: 5,156
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Re: 8.1 engine mounts?
You might try member DirtyLarry. He has a 8.1 in his square body, which shouldn't be that hard to adapt to fit your needs.
__________________
TREVOR  1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned)1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT)http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205)1970 Chevelle SS (LS5 454,th400,8track,buckets,tach):2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever |
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11-29-2018, 11:37 AM
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#3 |
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Registered User
Join Date: Feb 2016
Location: Louisiana
Posts: 92
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Re: 8.1 engine mounts?
Yea would like to contact him, he has a picture of the old mounts on a 8.1 yet the mounting holes doesn't look the same as mine. I have a 04-06 model though, I wouldn't think that would change anything.
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11-29-2018, 12:21 PM
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#4 | |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,771
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Re: 8.1 engine mounts?
Quote:
Dirty Larry sez: "The 8100 block has the same motor mount points as early small and big block Chevy's. Even the heads shared the same exhaust flange pattern. I was able to use a set of hedders from Dynomax and they bolted right up! A Turbo 400 bolted right up the 8100 and the torque converted bolted right up to the stock 8100 flex plate. Even a stock starter for a 1977 Chevy small block bolted right up, cranks over fine." I'm not sure if they changed anything in the later blocks or not but I wouldn't think so. I wouldn't use the poly mounts, they transfer too much vibration. The regular '72 BB clam shell mounts would be the best if you can find some. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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11-29-2018, 12:24 PM
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#5 |
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Senior Member
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,860
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Re: 8.1 engine mounts?
Not my thread but Thanks Leon.
__________________
other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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11-29-2018, 12:35 PM
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#6 | |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,771
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Re: 8.1 engine mounts?
Quote:
 ... I didn't say "Other Larry" I said "Dirty Larry".... LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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12-01-2018, 01:08 AM
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#7 | |
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Senior Member
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,860
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Re: 8.1 engine mounts?
Quote:
There are so many of us we have to add a tag. 
__________________
other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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12-01-2018, 02:05 PM
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#8 |
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Registered User
Join Date: May 2004
Location: Miss Co Arkansas
Posts: 679
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Re: 8.1 engine mounts?
Here are the ones I bought, 3.1116R.
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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11-29-2018, 01:51 PM
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#9 |
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Registered User
Join Date: Feb 2016
Location: Louisiana
Posts: 92
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Re: 8.1 engine mounts?
Checked again found out what the deal was, going to have to grind one down to match the others. Thanks for the input fellas!
Last edited by Thanos; 11-29-2018 at 02:44 PM. |
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11-30-2018, 10:25 PM
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#10 |
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Registered User
Join Date: May 2004
Location: Miss Co Arkansas
Posts: 679
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Re: 8.1 engine mounts?
I bought the inserts Larry suggests for the clamshell mounts. We'll see how they work out.
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76/77/78 Cheyenne 1997 K3500 454 soon to be 496 |
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12-01-2018, 12:58 AM
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#11 | |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,771
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Re: 8.1 engine mounts?
Quote:
LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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11-29-2018, 01:03 PM
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#12 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,405
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Re: 8.1 engine mounts?
The 8100's were made for such a short period of time, unlikely that the block mounts were changed...just a thought...
now if we were working on a ford....... |
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