Crank pulley/frame cross member clearance - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68 50th · 02-11-2006, 04:36 AM

Can anyone tell the approx clearance between crank pulley and front cross member?
I can't even get the fan belt out and something tells me it should be more clearance there.
The only thing I can think of is sagging motor mounts, but they do not really look that bad.
It is a 2wd 71 3/4-ton with 402 big block but it got the 72 style big block motor mounts.
Thanks.

Tx Firefighter · 02-12-2006, 01:09 PM

Here's a picture of my 70 model that I swapped to big block. Lots and lots of clearance.

FRENCHBLUE72 · 02-12-2006, 01:21 PM

Seems to me like the big block is in the forward motor mount holes???

Tx Firefighter · 02-12-2006, 02:56 PM

Yes sir, big blocks mount in forward holes. That's where mine are in the picture above.

68 50th · 02-14-2006, 05:15 PM

Tx Firefighter: Thanks a lot for the pic.
I can see there should be a lot of clearance.
Maybe the cross member has been bent at some time on my truck.
I don't know how it should be shaped but it looks (from Tx pic) like it shouldn't be bowed very much if looking at it from one side or from above.
Can anyone tell if this looks right or wrong?

Thanks

CC Rider · 03-28-2015, 01:14 PM

I have the same issue on my 67 c10. Did anyone have a root cause and fix for this ? I think I have a 454.

02-11-2006, 04:36 AM	#1
68 50th Senior Member Join Date: Jul 2004 Location: Sweden Posts: 833	Crank pulley/frame cross member clearance Can anyone tell the approx clearance between crank pulley and front cross member? I can't even get the fan belt out and something tells me it should be more clearance there. The only thing I can think of is sagging motor mounts, but they do not really look that bad. It is a 2wd 71 3/4-ton with 402 big block but it got the 72 style big block motor mounts. Thanks. Attached Images __________________ Mats.. ---------------------------------------------------- 1971 Cheyenne Super Custom Camper 475CBB/TH400/AC 1992 Silverado Sport Truck 1988 Silverado 2500 Ext Longbed 4x4 2001 GMC Sierra SLT 4x4 1990 Chevrolet K3500 1965 Pontiac Grand Prix 1980 Z 28 350/4-speed/AC/T-top 1980 Camaro Coupe V6/3-speed 1979 Buick Century Wagon

02-12-2006, 01:09 PM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Crank pulley/frame cross member clearance Here's a picture of my 70 model that I swapped to big block. Lots and lots of clearance. __________________ I'm on the Instagram- @Gearhead_Kevin

02-12-2006, 01:21 PM	#3
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	Re: Crank pulley/frame cross member clearance Seems to me like the big block is in the forward motor mount holes??? __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

02-12-2006, 02:56 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Crank pulley/frame cross member clearance Yes sir, big blocks mount in forward holes. That's where mine are in the picture above. __________________ I'm on the Instagram- @Gearhead_Kevin

02-14-2006, 05:15 PM	#5
68 50th Senior Member Join Date: Jul 2004 Location: Sweden Posts: 833	Re: Crank pulley/frame cross member clearance Tx Firefighter: Thanks a lot for the pic. I can see there should be a lot of clearance. Maybe the cross member has been bent at some time on my truck. I don't know how it should be shaped but it looks (from Tx pic) like it shouldn't be bowed very much if looking at it from one side or from above. Can anyone tell if this looks right or wrong? Thanks Attached Images __________________ Mats.. ---------------------------------------------------- 1971 Cheyenne Super Custom Camper 475CBB/TH400/AC 1992 Silverado Sport Truck 1988 Silverado 2500 Ext Longbed 4x4 2001 GMC Sierra SLT 4x4 1990 Chevrolet K3500 1965 Pontiac Grand Prix 1980 Z 28 350/4-speed/AC/T-top 1980 Camaro Coupe V6/3-speed 1979 Buick Century Wagon

03-28-2015, 01:14 PM	#6
CC Rider Registered User Join Date: Jul 2013 Location: Hutchinson MN Posts: 4	Re: Crank pulley/frame cross member clearance I have the same issue on my 67 c10. Did anyone have a root cause and fix for this ? I think I have a 454. Attached Images



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