big block in a 72 3/4 ton 4x4 help me out on mounts and fitment - The 1947 - Present Chevrolet & GMC Truck Message Board Network

super-k20 · 02-03-2006, 11:13 PM

I am going to put a 502 in a 72 3/4 ton 4x4 I was told that with the stock sbc mounts it will not fit. Is this true? will be running a small msd distributor and I would like not to cut or beat the firewall in.

CAN YA HELP A BROTHER OUT!!!!!!!!!!!

Longhorn Man · 02-03-2006, 11:19 PM

Welcome to the board.
A body lift will help tons.... as a matter of fact, if you refuse to beat the firewall... I think a body lift will be the only way to do this.

super-k20 · 02-03-2006, 11:23 PM

great thanks for the tip, anybody else try anything with 73 up clamshell mounts?

super-k20 · 02-03-2006, 11:26 PM

Hey longhorn will a 2" body lift be enough?

Longhorn Man · 02-03-2006, 11:50 PM

I couldn't say honestly.

scotto0609 · 02-04-2006, 09:35 AM

I used a 3" on my panel and it was barely enough,though it was a 67 panel on a 69 surbuban frame.

Big Bad 1972 Blazer · 02-05-2006, 10:54 AM

What you'll find on these trucks it that there is a huge amount of variation from one to the next. It results in somebody not having to touch the firewall with a BB and 2" of body lift, but the next truck might have to scallop the firewall in 3" with the same lift kit. No way to know until you do it. On my Blazer, I used a 3" body lift when I installed my 496 with tall valve covers and I had to cut & weld in large patch panels to clear the covers. The distributor was clear by a mile though. If you're able to do little body work, the mods are relatively simple and look really clean when done

.

6872xtc · 02-05-2006, 11:04 AM

My 70 has a 454 w/short covers and with no body lift I did the build panel bit. HEI dist clears but not much room on wires (1/8 in. maybe). Just like Big Bad 1972 Blazer said it seems to vary by truck.

super-k20 · 02-05-2006, 12:40 PM

Thanks for all your help, I guess I'll stuff it in there and see what has to be done. I'll keep you updated with pics.

smokekiki · 02-07-2006, 11:17 AM

The best thing is to try it!My 71 suburban has a BB in it.No body lift or firewall work.It has short valvecovers.They clear by about an 1/8th inch.

Bram · 02-08-2006, 03:25 PM

Basically what I did is connect all three together and dropped the transfer case in the original holes; this gave me plenty of firewall clearance with the BB, with no other mods like body lift. All I had to do was move the motor mounts forward and drill new holes. Hope this helps a little?

4x4Poet · 02-10-2006, 09:05 PM

One can use a 73up GM truck engine xmember with a little drilling and maybe a little trimming:

http://67-72chevytrucks.com/vboard/s...d.php?t=177617

02-03-2006, 11:13 PM	#1
super-k20 Registered User Join Date: Oct 2005 Location: omaha ne Posts: 4	big block in a 72 3/4 ton 4x4 help me out on mounts and fitment I am going to put a 502 in a 72 3/4 ton 4x4 I was told that with the stock sbc mounts it will not fit. Is this true? will be running a small msd distributor and I would like not to cut or beat the firewall in. CAN YA HELP A BROTHER OUT!!!!!!!!!!!

02-03-2006, 11:19 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment Welcome to the board. A body lift will help tons.... as a matter of fact, if you refuse to beat the firewall... I think a body lift will be the only way to do this.

02-03-2006, 11:23 PM	#3
super-k20 Registered User Join Date: Oct 2005 Location: omaha ne Posts: 4	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment great thanks for the tip, anybody else try anything with 73 up clamshell mounts?

02-03-2006, 11:26 PM	#4
super-k20 Registered User Join Date: Oct 2005 Location: omaha ne Posts: 4	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment Hey longhorn will a 2" body lift be enough?

02-03-2006, 11:50 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment I couldn't say honestly.

02-04-2006, 09:35 AM	#6
scotto0609 Junior Member Join Date: Nov 2005 Location: new york Posts: 226	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment I used a 3" on my panel and it was barely enough,though it was a 67 panel on a 69 surbuban frame.

02-05-2006, 10:54 AM	#7
Big Bad 1972 Blazer Registered User Join Date: Jan 2005 Location: Armada, MI 48188 Posts: 83	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment What you'll find on these trucks it that there is a huge amount of variation from one to the next. It results in somebody not having to touch the firewall with a BB and 2" of body lift, but the next truck might have to scallop the firewall in 3" with the same lift kit. No way to know until you do it. On my Blazer, I used a 3" body lift when I installed my 496 with tall valve covers and I had to cut & weld in large patch panels to clear the covers. The distributor was clear by a mile though. If you're able to do little body work, the mods are relatively simple and look really clean when done .

02-05-2006, 11:04 AM	#8
6872xtc Registered User Join Date: Jan 2006 Location: Grand Jct.,CO Posts: 59	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment My 70 has a 454 w/short covers and with no body lift I did the build panel bit. HEI dist clears but not much room on wires (1/8 in. maybe). Just like Big Bad 1972 Blazer said it seems to vary by truck.

02-05-2006, 12:40 PM	#9
super-k20 Registered User Join Date: Oct 2005 Location: omaha ne Posts: 4	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment Thanks for all your help, I guess I'll stuff it in there and see what has to be done. I'll keep you updated with pics.

02-07-2006, 11:17 AM	#10
smokekiki Mike Join Date: Jan 2003 Location: west chester pa Posts: 2,473	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment The best thing is to try it!My 71 suburban has a BB in it.No body lift or firewall work.It has short valvecovers.They clear by about an 1/8th inch. __________________ 70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires

02-08-2006, 03:25 PM	#11
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	Re: big block in a 72 3/4 ton 4x4 help me out on mounts and fitment Basically what I did is connect all three together and dropped the transfer case in the original holes; this gave me plenty of firewall clearance with the BB, with no other mods like body lift. All I had to do was move the motor mounts forward and drill new holes. Hope this helps a little? __________________ 72CheyenneSuper1ton4x4BigBlock

02-10-2006, 09:05 PM	#12
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	One can use a 73up GM truck engine xmember with a little drilling and maybe a little trimming: http://67-72chevytrucks.com/vboard/s...d.php?t=177617 __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.



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