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05-01-2019, 08:01 PM
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#1 |
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Registered User
 Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Motor Mount Perches?
Hi Folks, I have been trying to replace the Motor Mount Perches in my 1971 Chevy K20 Pickup. The VIN number states the truck came with a V8. Some previous owner stuffed a 454 in it, using the what I think is the original Crossmember and Perches which should have been for a Chevy 350. The 454 is hitting the firewall in two places. I want to move it forward but I cant find replacement perches. Mine are badly worn. Does anybody recognize these? One picture is the crossmember and the other picture is the Perch that came out of the Truck and the other Perch is what LMC sent me for a Small Block V8. If anybody can ID my Crossmember and Engine Perches I would greatly appreciate it. Cheers, Jack
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05-01-2019, 08:07 PM
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#2 |
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Senior Member
Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Motor Mount Perches?
Lock Doc picture
__________________
 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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05-01-2019, 08:18 PM
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#3 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
Thanks for the picture. None of those look like mine. There are no other holes in my frame that would suggest a different crossmember and the ones in your picture won't even come close to bolting up.
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05-01-2019, 09:12 PM
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#4 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,723
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Re: Motor Mount Perches?
You have a four wheel drive truck and all of the other perches are from 2x4 trucks. Move the entire crossmember and mounts forward. Unlike a 2x4 truck, the suspension is not attached to the crossmember.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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05-01-2019, 09:23 PM
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#5 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
That's what I planned on doing but my Perches are pretty worn. I would like to replace them. Any idea of a source? I tried Brothers, LMC, Classic and a couple of others. No luck.
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05-01-2019, 09:35 PM
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#6 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
Well, I found the perches on page 149 of the 67-72 factory assembly manual. Still doesn't help me any as I don't have a part number or a source for them.
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05-01-2019, 10:18 PM
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#7 |
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SWB 4x4 Collector
Join Date: Jun 2001
Location: Osage City, KS
Posts: 5,155
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Re: Motor Mount Perches?
To my knowledge, they aren’t reproduced. What is the worn area you speak of?
__________________
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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05-01-2019, 10:30 PM
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#8 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
The flat spot where the engine mount sits on the perch is almost worn through from the steel part of the engine mount. The rubber was compressed to the point that it was metal to metal contact. I'm not sure if these motor mounts are the correct ones for the perches. Also the hole in the middle is elongated. I'm not sure if there is a bushing that is supposed to go there as the through bolt from the engine mount is much smaller in diameter than the hole in the perch.
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05-02-2019, 01:15 AM
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#9 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,596
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Re: Motor Mount Perches?
I've seen that before where the metal rubs a nice slot from the vibration. All I did was weld up the area and sanded it back down. Touch of paint got it looking like brand new. Took less than an hour
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05-02-2019, 09:08 AM
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#10 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
Thanks for the suggestion. That might work for me.
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05-02-2019, 06:57 PM
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#11 |
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Registered User
Join Date: Mar 2019
Location: Arlington, TN
Posts: 170
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Re: Motor Mount Perches?
The hole on your mount isn't that bad. The big block trucks had a larger hole than the small block trucks.
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05-03-2019, 12:09 AM
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#12 | |
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All about them K’s
 
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,444
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Re: Motor Mount Perches?
Quote:
Here’s a pic after one of the repairs.
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
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05-03-2019, 12:10 AM
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#13 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
The 71 K20 didn't come with a big block. I believe it was an option on the C models. Supposedly my perches are for the small block 350. I'm thinking there should be a bushing or something to take up the space around the skinny ass bolt that goes through that hole. The other perch is much worse than the one in the photo. I held the new engine mount up to the old perch and it does seem to fit marginally okay, but it sure leaves a lot of room for slop. I would think the GM engineers would have come up with something a little better. That being said I just finished tearing down my NP205 transfer case and rebuilding it. I'm not sure what planet the guy was from who designed that case but clearly no thought was given to rebuilding it. Thanks, Jack
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05-04-2019, 10:35 AM
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#14 |
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Registered User
Join Date: Apr 2008
Location: Md
Posts: 2,481
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Re: Motor Mount Perches?
These were from a 72 K5 Blazer 350/350...NP205 transfer case.....can post in for sale section if your interested....LMK
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http://67-72chevytrucks.com/vboard/s...d.php?t=635605 |
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05-04-2019, 10:47 AM
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#15 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,276
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Re: Motor Mount Perches?
It is possible that square body BBC perches were used as they may have junk yard items when your truck was converted.
__________________
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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05-04-2019, 11:33 AM
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#16 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
Anything is possible with this truck.
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05-04-2019, 11:34 AM
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#17 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
I will let you know if I need those perches. Thanks
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09-07-2019, 10:13 AM
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#18 |
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Registered User
Join Date: Jun 2018
Location: Sandy, Utah
Posts: 102
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Re: Motor Mount Perches?
NotSolo, Do you still have the perches? Jack
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