Motor mount question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

polevault1977 · 11-11-2002, 11:48 PM

Hi All, I'm new to the forum and rebuilding these great (67-72) trucks. I've learned a lot of info from the forum. Best resource I've found!

My question, I bought a bunch of chevy truck parts. One wrecked truck and another 71 frame and a couple of beds. No motor or tranny in any of them. I have stripped and sandblasted the 71 frame. It's now painted and I've basically got the frontend rebuilt. What I cannot figure out is the motor mounts. I have two sets. One is cracked and probably no good. They line up with the front set of holes. The other set is in great shape (cleaned and painted) and they line up with the back set of holes. I am planning on running a sb. Will the set that goes in the back work with a sb or they for 6 banger? Any help appreciated. I'll try to attach a pic. Never did this before.

Danny

frost89434 · 11-11-2002, 11:51 PM

The back set of holes are for a 6 cylinder. But you can put a small block there. That is where I have mine. And it worked fine.
Jim

*Fast68Chevy* · 11-11-2002, 11:59 PM

welcome to forum

6 cyl brackets are taller longer than SBC ones, i canmt tell which you have in pic, its hard to tell but whichever are shorter are the SBC ones and whichever are longer are the 250/292 ones

292 have an exception though, the pass side bracket on 292 are in forward holes same as V-8 uses and is not same bracket as any other engine size, i dont have digicam to show you difference but i have a couple of 292 pass side brackets here, and driver side one for both 6 cyl engines are same one and both use rear holes unlike SBC

sub4rvr · 11-12-2002, 12:03 AM

small block.

polevault1977 · 11-12-2002, 12:05 AM

Thanks for the quick replies. I'm still not sure which mount is in the pic above. Any measurements I can take or a different pic that would help in IDing this mount?
danny

sub4rvr · 11-12-2002, 12:09 AM

sorry, i don't know the differences, but that's where a 350 bolts up. i can measure mine if you need me to. Randy can be of more help though.

polevault1977 · 11-12-2002, 12:13 AM

Randy, thanks for hanging with me. I just shot of couple of more pics. Hope these show them a little better. They are not bolted in. Danny

polevault1977 · 11-12-2002, 12:17 AM

pic

polevault1977 · 11-12-2002, 12:21 AM

another pic, they didn't turn out very good though

Hutch · 11-12-2002, 12:46 AM

Those exhaust holes through the crossmember look a lot like the ECE Rodstoration.
Must be planning on droping that Truck.

From what I have gathered the front mounting holes (forward)are for the small block and the rear are for the inline 6 but you can mount a sb in the 6 cyl position.
Quite a few members have done this(v8 in the 6 position) with good results.
The problems that they encounter are clearance for the distributor and distance to the fan shroud (depending on the Water pump)
A basic rule as to factory location is v/8 forward 6 to the rear.

As to your question about the engine mounts.Whether they are for a six or eight I will leave it to the experts as all of mine are V/8's.

I hope this helps
As alway's feel free to correct me if I am wrong on this line of thought.

*Fast68Chevy* · 11-12-2002, 12:56 AM

all correct cept for that 292 is oddball and pass side is forward and driver side is rearward and pass side 292 uses special tree bracket

crazy longhorn · 11-12-2002, 01:25 AM

You have the 6 /250 stands shown in the pics. as already posted, your smallblock will mount on them, but will sit roughly 3 1/2" back from the V8 (factory)position. My longhorn is set up this way to slide a little weight rearward. I run an HEI dist, but clearance is pretty tight......I opted to drill the hole in the stand to 5/8"(the ones for the motor mount bolts), to give a little room to "cheat" a fraction of an inch. the holes in my trans crossmember are also slotted. for correct lenght on the pump/shroud, I run a 73 up long pump,pulleys, brackets, steering pump. Good luck

polevault1977 · 11-12-2002, 08:32 PM

Thanks all for the info. Where else could you go and get such good feedback?!!!! I've already hit the local junk yard and found a good set of v-8 motor mount brackets. Anybody need the other one I have for the 6?

Hutch, you are right on with the exhaust. I figure with 6 inches of drop I'll need to route it through the crossmember,

Crazy Longhorn, thanks for the id. All have been very helpful.

Until the next question,

Danny Frazier

crazy longhorn · 11-12-2002, 08:37 PM

Happy 'truckin dude!

11-11-2002, 11:48 PM	#1
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	Motor mount question Hi All, I'm new to the forum and rebuilding these great (67-72) trucks. I've learned a lot of info from the forum. Best resource I've found! My question, I bought a bunch of chevy truck parts. One wrecked truck and another 71 frame and a couple of beds. No motor or tranny in any of them. I have stripped and sandblasted the 71 frame. It's now painted and I've basically got the frontend rebuilt. What I cannot figure out is the motor mounts. I have two sets. One is cracked and probably no good. They line up with the front set of holes. The other set is in great shape (cleaned and painted) and they line up with the back set of holes. I am planning on running a sb. Will the set that goes in the back work with a sb or they for 6 banger? Any help appreciated. I'll try to attach a pic. Never did this before. Danny Attached Images

11-11-2002, 11:51 PM	#2
frost89434 Registered User Join Date: Nov 2001 Location: sparks, NV Posts: 1,141	The back set of holes are for a 6 cylinder. But you can put a small block there. That is where I have mine. And it worked fine. Jim __________________ 68 short fleet with 71 front clip 2wd jaguar blue 99 chevy ext cab shrtbed z71 loaded 99 chevy swb fleetside(daily driver) Sparks, Nevada

11-12-2002, 12:03 AM	#4
sub4rvr Registered User Join Date: May 2000 Location: Palm Springs, Ca. Posts: 574	small block. Attached Images __________________ 72 C10 Suburban 90 S10 57 F100 (2) 67 Mustang (2) 69 Torino GT 00 Mustang GT Conv.

11-12-2002, 12:09 AM	#6
sub4rvr Registered User Join Date: May 2000 Location: Palm Springs, Ca. Posts: 574	sorry, i don't know the differences, but that's where a 350 bolts up. i can measure mine if you need me to. Randy can be of more help though. __________________ 72 C10 Suburban 90 S10 57 F100 (2) 67 Mustang (2) 69 Torino GT 00 Mustang GT Conv.

11-12-2002, 12:17 AM	#8
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	pic Attached Images

11-11-2002, 11:59 PM	#3
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	welcome to forum 6 cyl brackets are taller longer than SBC ones, i canmt tell which you have in pic, its hard to tell but whichever are shorter are the SBC ones and whichever are longer are the 250/292 ones 292 have an exception though, the pass side bracket on 292 are in forward holes same as V-8 uses and is not same bracket as any other engine size, i dont have digicam to show you difference but i have a couple of 292 pass side brackets here, and driver side one for both 6 cyl engines are same one and both use rear holes unlike SBC

11-12-2002, 12:05 AM	#5
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	Thanks for the quick replies. I'm still not sure which mount is in the pic above. Any measurements I can take or a different pic that would help in IDing this mount? danny

11-12-2002, 12:13 AM	#7
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	Randy, thanks for hanging with me. I just shot of couple of more pics. Hope these show them a little better. They are not bolted in. Danny

11-12-2002, 12:21 AM	#9
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	another pic, they didn't turn out very good though Attached Images

11-12-2002, 12:46 AM	#10
Hutch Registered User Join Date: Oct 2001 Location: Grapevine, Tx. Posts: 2,142	Those exhaust holes through the crossmember look a lot like the ECE Rodstoration. Must be planning on droping that Truck. From what I have gathered the front mounting holes (forward)are for the small block and the rear are for the inline 6 but you can mount a sb in the 6 cyl position. Quite a few members have done this(v8 in the 6 position) with good results. The problems that they encounter are clearance for the distributor and distance to the fan shroud (depending on the Water pump) A basic rule as to factory location is v/8 forward 6 to the rear. As to your question about the engine mounts.Whether they are for a six or eight I will leave it to the experts as all of mine are V/8's. I hope this helps As alway's feel free to correct me if I am wrong on this line of thought. __________________ John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS

11-12-2002, 12:56 AM	#11
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	all correct cept for that 292 is oddball and pass side is forward and driver side is rearward and pass side 292 uses special tree bracket

11-12-2002, 01:25 AM	#12
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	You have the 6 /250 stands shown in the pics. as already posted, your smallblock will mount on them, but will sit roughly 3 1/2" back from the V8 (factory)position. My longhorn is set up this way to slide a little weight rearward. I run an HEI dist, but clearance is pretty tight......I opted to drill the hole in the stand to 5/8"(the ones for the motor mount bolts), to give a little room to "cheat" a fraction of an inch. the holes in my trans crossmember are also slotted. for correct lenght on the pump/shroud, I run a 73 up long pump,pulleys, brackets, steering pump. Good luck __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

11-12-2002, 08:32 PM	#13
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	Thanks all for the info. Where else could you go and get such good feedback?!!!! I've already hit the local junk yard and found a good set of v-8 motor mount brackets. Anybody need the other one I have for the 6? Hutch, you are right on with the exhaust. I figure with 6 inches of drop I'll need to route it through the crossmember, Crazy Longhorn, thanks for the id. All have been very helpful. Until the next question, Danny Frazier

11-12-2002, 08:37 PM	#14
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Happy 'truckin dude! __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

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