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Old 11-05-2020, 10:18 PM   #1
7beast
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1971 K10 lsx motor mount help

Hey fellas I need some advice, I have a 1971 k10 half ton that is equipped with a sbc350 th400 transmission and NP205.. i plan to keep all the drivetrain the same except for the sbc350. I plan on putting in a 5.3 motor and I was looking for advice on which motor mounts/perches fit best. Thanks in advance fellas

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Old 11-06-2020, 01:05 AM   #2
57taskforce
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Re: 1971 K10 lsx motor mount help

I will move this to ls swaps, you’re likely to get more responses there.
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'72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879
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Old 11-06-2020, 08:44 AM   #3
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Re: 1971 K10 lsx motor mount help

What you'll need is a set of adapters that locate the rear of the LS in the same spot as the sbc..
I used Ebay adapters on mine....worked perfectly...
Mine look like pic down below

but I see alot of people using the slider style..like dirty dingo
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Old 11-06-2020, 04:31 PM   #4
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Re: 1971 K10 lsx motor mount help

Quote:
Originally Posted by mongocanfly View Post
What you'll need is a set of adapters that locate the rear of the LS in the same spot as the sbc..
I used Ebay adapters on mine....worked perfectly...
Mine look like pic down below

but I see alot of people using the slider style..like dirty dingo
Cool, and then you just used your oem mounts and oem pedestals? Is your truck a k10?
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Old 11-06-2020, 10:00 PM   #5
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Re: 1971 K10 lsx motor mount help

mines a C30..but its the same...plates bolt to LS engine, sbc side bolts to plate...stock engine mounts...dropped right in, you could put the long bolts in with 2 fingers..
the slider style will give you a little room for error, so you might want to look into those..
heres a slider mount
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Last edited by mongocanfly; 11-06-2020 at 10:06 PM.
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Old 11-07-2020, 12:44 AM   #6
57taskforce
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Re: 1971 K10 lsx motor mount help

You need an ls swap crossmember for the 67-72 4x4 trucks.
This is just one of several options

http://pacificfabrication.com/63-72-...ssmembers.html
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'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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Old 11-07-2020, 03:04 PM   #7
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Re: 1971 K10 lsx motor mount help

Didnt know you had to change the crossmember ..what issues do the stock one create?..oil pan clearance?
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1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
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Old 11-08-2020, 11:08 AM   #8
57taskforce
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Re: 1971 K10 lsx motor mount help

Yes sir, the pan doesn’t clear. I’ve read some people have had luck actually using the $50ish 55-59 v8 swap crossmember. I think I’m going to try that when I do my 6.0. It’s a hell of a lot cheaper.
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'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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Old 11-10-2020, 10:48 PM   #9
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Re: 1971 K10 lsx motor mount help

Thanks alot for all the replies and help fellas. 57taskforce im really curious about the 55-59 chevy truck crossmember.. is there anyone else on here that can shed some light on this crossmember used on 67-72 k10?
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Old 11-11-2020, 12:12 PM   #10
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Re: 1971 K10 lsx motor mount help

I used the engine crossmember but I got mine from Jegs-someone here posted a link before. It worked for me. The only thing I noticed is that my engine seems to sit a little higher then the other crossmember kits. I have clearance every where but it is close to the fire wall but does not hit.
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Old 11-11-2020, 12:47 PM   #11
57taskforce
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Re: 1971 K10 lsx motor mount help

http://67-72chevytrucks.com/vboard/s...=661982&page=4

Toward the end of this thread is where you find the 55-59 crossmember
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'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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