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1972 Blazer Motor Mounts

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by rudycentral, May 14, 2005.

  1. rudycentral

    rudycentral Registered Member

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    I have bought the Prothane motor mounts, but the bolts seem a little small that came with them. They slide right through the crossmember holes. The only thing holding it back is a very slim portion of the washer that was supplied. I do not feel confident mounting the motor like this. Does anyone have any suggestions?

    Thanks in advance...
     
  2. therobzilla

    therobzilla 1/2 ton status

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    Steve,

    You need to do a little more checking, I own a 72' first gen, and last I checked, they don't make a ureathane motor mount for a first gen. You may have a second gen, but I'm pretty sure the first gens are only available in a stock format.

    Let me know if I am wrong.

    Good Luck.

    Rob
     
  3. rudycentral

    rudycentral Registered Member

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    got it from summit... PTP-7-509

    Dude on phone said it would work months ago when I bought it.
    Now I am *#$%@!
    The motor is built pretty good - the old ones from the old fried motor were toast. I cannot find the old bolts at the moment.

    Where should I get the mounts from, I will send these ones back.
     
  4. Burt4x4

    Burt4x4 3/4 ton status

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    Hmmmm, I was never able to find "first gen motor mnts"... fer me 72,,,
    keep in mind I quit looking years aso so maby thins have changed????????????
     
  5. Boondocks

    Boondocks 1/2 ton status

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    I don't have any advice on the Prothane mounts.

    I was thinking for my rig to add a limit strap in-case one of my stock mounts failed.

    A friend of mine installed one on his '86 Buick T-Type that I really liked. It had a ratchet mechanism so the amount of slack or tension could be easily adjusted.

    If you are interested, I will contact him for a picture and info.
     
  6. rudycentral

    rudycentral Registered Member

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    Thinking...

    Do you guys think that I could weld some extra metal on the crossmember like a big washer with the right size hole drilled in it, or is the placement of the mounting hole different? :confused:

    100_1182_1.JPG
     
  7. therobzilla

    therobzilla 1/2 ton status

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    Steve,

    You can get original motor mounts anywere, Napa, Autozone....

    The bolts are pretty basic SAE treads, the bolt that goes through the frame to the mount itself if I recall correctly is a 5/8" fine, not positive, but the bolts that hold the motor mount to the motor are standard 3/8" SAE.

    I am using ARP motor mount bolts for both the motor mount to motor, and the thru frame bolt. Never any problems.

    Just make sure you retourque them after it's in an running a while.

    Rob
     
  8. rudycentral

    rudycentral Registered Member

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    Picture & more thoughts

    Ok picture below.
    The bolt supplied has a small head, and I think that the original had a much larger head, anyone else got some pictures?

    I will probably get the mounts from Autozone.
    I really would like to use the poly mounts though.
    Question: How do these rubber mounts hold up over time?
    This motor has good power to it, and ripped up some rubber mounts that I had in a Nova quite a while back.

    100_1230_1.JPG
     
  9. JIMs70K25

    JIMs70K25 1/2 ton status

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    Can't answer your specific question, but GMCPauls has poly mounts for the 1st gens. Something like $80 a pair.
    Are you going all poly? transfer case torque mount and tranny mount?
     
  10. rudycentral

    rudycentral Registered Member

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    Thanks, I will try GMC Paul's tomorrow.
     
  11. rudycentral

    rudycentral Registered Member

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    GMC Pauls does not carry any motor mounts for 1972 V8 4x4 Blazer.

    He does have polyurethane transmission and transfer case torque mounts, which I am going to order.

    I have ended up ordering the motor mounts from Murray's. I am sending the prothane poly motor mounts back to Summit, unless someone wants them....

    therobzilla: What was the part number on those ARP Frame to Mount bolts?

    Boondocks: Do you think you could get me that picture, and the parts numbers for the tie-down system your friend has going on. I got a feeling that this motor will need to be restrained.
     
  12. bdozeraz

    bdozeraz 1/2 ton status

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    All the motor mounts from checker, autozone, napa, and pep boys are made by the same company in india. I went to all of them not to long ago to get mounts. They all carry them at different prices.
    The problem is that the threads in the middle of the mount for the bolt that goes through the cross member is 10mm. Thats why I went to all the stores I was trying to find one that wasn't. I ended up tapping it out to 5/8" and putting a long bolt that went all the way through with a large washer and lock nut on the other side. If is does seperate the nut and washer will keep it together.

    Brent
     
  13. Burt4x4

    Burt4x4 3/4 ton status

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    Or you can do this:
    [​IMG]

    On my 72 I tossed the factory crossmember for a 73up crossmember and framehorns/engine mount brackets. THen I bought Off Road Designs HP engine mounts. It took a little fab work to get the 73+ in there but it did work. Plus now I can drop the oil pan without the x-member being in the way :D
     
  14. rudycentral

    rudycentral Registered Member

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    bdozeraz,
    So you drilled all the way through the rubber mount and put a nut and washer on the inside between the engine and the motor mount?
    How did the 5/8th size up against the hole in the frame side of the mount?
    The bolt in my picture is a 5/8 and it slips right through the frame.
    see my mounts in the pictures attached.

    Also notice the nice garage shot, old leaky motor (foreground), old nice motor (background) ready for install.

    Ugh this sucks - it was so much easier with my Nova 10 years ago.

    100_1232_1.JPG

    100_1235_1.JPG
     
  15. Boondocks

    Boondocks 1/2 ton status

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    Last edited: May 16, 2005
  16. bdozeraz

    bdozeraz 1/2 ton status

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  17. Boondocks

    Boondocks 1/2 ton status

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    My friend responded.

    Apparently what I thought was a product for this purpose, turns out to be a regular, heavy-duty ratchet strap. No picture, but it was attached with a bolt to the front of the driver-side head and to the frame.

    What can I say, it works for him and he races this car at the local drag strip.
     
  18. JIMs70K25

    JIMs70K25 1/2 ton status

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    From GMCPauls website:
    67-72 V8 Small Block Polyurethane High Performance Front Engine Mount Pair
    653252 1967-72 V8 Small block polyurethane high performance front engine mounts. Just like original style rubber engine mounts but made of polyurethane for longer life with increased torque of high performance motors, these have been designed with an interlocking feature to still hold the engine in the case of a cushion failure. attaches engine to frame mounts, for all 283-350 CI engines. Made of black polyurethane to retain that original look. Sold in pairs.

    Half way down the first engine page.
     
  19. rudycentral

    rudycentral Registered Member

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    JIMs70K25: I called to double check everything and the guy on the phone said no they do not carry those. Probably the same as the ones I got from Summit.

    therobzilla: Do those ARP frame to mount bolts appear like they have an extra large head, or did you also put a giant washer in place like bdozeraz?

    Thanks for everyones input, you just made my life alot easier.
     

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