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#26 |
Registered User
Join Date: Apr 2004
Location: N.E. MO
Posts: 1,749
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Re: 72 GMC - Engine hitting firewall...need advice
Here's mine.
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72 C20 4X4 454 4 speed 89 Trans Am (was) 305 TPI 700r4 93 C1500 2wd Extended cab 350 700r4 98 Sonoma (TPI outa the Trans Am) 03 Yamaha 660 Raptor 03/04 660 Raptor 07 700 Raptor 85 Honda Odyssey |
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#27 |
Registered User
Join Date: Mar 2003
Location: Perrysville Indiana
Posts: 258
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Re: 72 GMC - Engine hitting firewall...need advice
Try the simple things first. Like what was said before look at your cab mounts. It doesn't take much of a drop in the bushings to cause your problem. Also, look at your transfer case mounts they are usually smashed down from all of the weight over the years. Put some polyurethane transmission mounts in place of the old ones and see what that does. If you haven't replaced them already I am sure it needs it. Cheap and easy fix.
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69 Chevelle SS 375/396 TKO 600 71 Suburban 3/4 4x4 402 5-speed (project) 68 chevy C10 shortbed 327 5-speed (project) 72 Blazer 4x4 400 4-speed (wifes project) Numerous 67-72 parts trucks |
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#28 |
Registered User
Join Date: Jul 2006
Location: Seattle
Posts: 56
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Re: 72 GMC - Engine hitting firewall...need advice
i got sick, so I haven't been able to work on it.
here is where its touching. Thanks to all for the advice. |
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#29 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: 72 GMC - Engine hitting firewall...need advice
if you are careful you can remove the valve covers and rear rockers. lay rags over the heads and use the 2 hammer method of massaging the firewall.
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#30 |
Registered User
![]() Join Date: Jan 2002
Location: So Cal
Posts: 658
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Re: 72 GMC - Engine hitting firewall...need advice
The main cluprit is the tall valve covers. I have a set on my 71 4X4 and they barely clear. I can't stick my finger between the cover and the firewall and the difference between mine and yours is the corners are more rounded on mine. Your valve covers look great but the easiest solution is to find ones that clear.
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71 Cheyenne Super 4X4 SB 72 Cheyenne Super 4X4 SB 72 Cheyenne 4X4 SB |
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