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It is currently Wed Nov 27, 2024 4:50 am
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[ 13 posts ] |
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Justin
Official CCB Member
Joined: Sun Oct 10, 2010 12:04 am
Posts: 6198
Images: 0
Location: Lakewood
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 Head I was lucky enough to get a great set of GT40 heads at the swap meet. I've never swapped a set of heads, but from the reading I've been doing it doesn't look took hard. What I know nothing about is how to evaluate their condition. Obviously, I could take them to a machine shop and have them checked out and possibly refurbished, but that's $$ I don't want to spend. Anyone have any advise on how to check out whether or not they can be installed as-is?
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| Sun Mar 31, 2013 12:12 pm |
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Gunnibronco
Official CCB Member
Joined: Mon Jan 03, 2011 6:07 pm
Posts: 4074
Location: Gardnerville, NV
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Re: Head I think they should at least be checked by a shop to see if they are true/flat. They can warp and probably make sealing difficult/impossible. I'm don't think there is a way to do that yourself, maybe I'm wrong. I don't know what to look for in the valvetrain.
_________________
"America is at that awkward stage. It's too late to work within the system, but too early to shoot the bastards." – Claire Wolfe
74-AWB 98", ZF5, Atlas4, TGW HP1060 and HP1014 axles, ARBs, 37's, 3.5" lift-5.5" front coil springs, Tahoe rear springs, EFI 302, h-boost, York OBA, 4x4x2, custom dash & gauges
72 U15- Explorer Sport-Candyapple Red (1 of 141)
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| Sun Mar 31, 2013 1:39 pm |
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darkmagus
Official CCB Member
Joined: Wed Mar 09, 2011 10:47 pm
Posts: 57
Location: Englewood
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Re: Head You just need a precision straight edge and a set of feeler gauges.
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| Sun Mar 31, 2013 3:12 pm |
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REH
Official CCB Member
Joined: Fri Oct 07, 2011 12:28 pm
Posts: 56
Location: Cortez
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Re: Head use a straight edge and feeler guage like stated above, then pour a little gas in the compression champers, if the valves hold gas they are good. check the valve bonnets and make sure that they are in good condition.
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| Tue Apr 02, 2013 8:57 am |
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Gunnibronco
Official CCB Member
Joined: Mon Jan 03, 2011 6:07 pm
Posts: 4074
Location: Gardnerville, NV
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Re: Head So is the head checked across the long length of the head, or across the short length? or both? diagonally?
What is an acceptable feeler gauge to fit under the straight edge?
_________________
"America is at that awkward stage. It's too late to work within the system, but too early to shoot the bastards." – Claire Wolfe
74-AWB 98", ZF5, Atlas4, TGW HP1060 and HP1014 axles, ARBs, 37's, 3.5" lift-5.5" front coil springs, Tahoe rear springs, EFI 302, h-boost, York OBA, 4x4x2, custom dash & gauges
72 U15- Explorer Sport-Candyapple Red (1 of 141)
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| Tue Apr 02, 2013 7:06 pm |
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darkmagus
Official CCB Member
Joined: Wed Mar 09, 2011 10:47 pm
Posts: 57
Location: Englewood
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Re: Head You'll have to check specs on what's acceptable. Here's a photo of the pattern to check in. Just make sure you use a precision straight edge and not something like a ruler. 
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| Tue Apr 02, 2013 7:19 pm |
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Gunnibronco
Official CCB Member
Joined: Mon Jan 03, 2011 6:07 pm
Posts: 4074
Location: Gardnerville, NV
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Re: Head Cool thanks, I had no real idea what was involved. More simple than I imagined.
_________________
"America is at that awkward stage. It's too late to work within the system, but too early to shoot the bastards." – Claire Wolfe
74-AWB 98", ZF5, Atlas4, TGW HP1060 and HP1014 axles, ARBs, 37's, 3.5" lift-5.5" front coil springs, Tahoe rear springs, EFI 302, h-boost, York OBA, 4x4x2, custom dash & gauges
72 U15- Explorer Sport-Candyapple Red (1 of 141)
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| Tue Apr 02, 2013 7:27 pm |
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Justin
Official CCB Member
Joined: Sun Oct 10, 2010 12:04 am
Posts: 6198
Images: 0
Location: Lakewood
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Re: Head Very cool, thanks!
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| Tue Apr 02, 2013 7:36 pm |
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horseplay
Official CCB Member
Joined: Mon Jan 21, 2013 8:24 pm
Posts: 408
Location: Grand Junction CO
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Re: Head I have a small repair shop in Evergreen I would be happy to check them out for you. Give me a call at the shop if you want to stop by.
Rob C
303 679-1610
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| Tue Apr 02, 2013 7:46 pm |
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darkmagus
Official CCB Member
Joined: Wed Mar 09, 2011 10:47 pm
Posts: 57
Location: Englewood
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Re: Head I just noticed some of the lines aren't very clear but there should be 7 lines. There's variation on where to check between manufacturers but the one above is how I check with the addition of lengthwise in the center.
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| Tue Apr 02, 2013 7:49 pm |
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Robs71sport
Official CCB Member
Joined: Tue Oct 12, 2010 2:07 pm
Posts: 59
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Re: Head
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| Tue Apr 02, 2013 9:23 pm |
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Justin
Official CCB Member
Joined: Sun Oct 10, 2010 12:04 am
Posts: 6198
Images: 0
Location: Lakewood
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Re: Head Thanks for all of the tips, guys. I ended up taking them down to Scott at MPG heads to have him take a look at them. Got them hot tanked and cleaned up, and had Scott inspect the valve seats and guides. The good news is that they're in great shape and can be run as it. The bad news is that I need to find a set of rockers before they'll actually work. Anyone have a spare set of stock GT40 rockers laying around? Also, can I use the existing pushrods, or to I need to buy new?
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| Fri Apr 05, 2013 9:23 am |
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JGZ
Official CCB Member
Joined: Sat Oct 23, 2010 3:20 pm
Posts: 393
Location: Pueblo West
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Re: Head There were some at Colo.Auto last week.Already off.
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| Fri Apr 05, 2013 10:41 am |
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