351 Yates heads C-3 1971-73 mustang - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-07-2005, 04:04 PM
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351 Yates heads C-3 1971-73 mustang

I need a set of headers for this application. Any ideas, need help bad. When I put my hooker SC headers on these heads the top bolt holes lined up. We checked again for clearance and tried to bolt them up and the bottom bolts are out along ways. Working on this for 2 months, without a solution. HELP


Tim Albers

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Old 12-07-2005, 05:13 PM
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Is there enough material on the flange to redrill? Either that or make a new set of flanges.
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Old 12-08-2005, 08:55 AM
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C3 heads

We are trying that, but with the super comp headers there is not quite enough room. We might have to weld flanges to flanges. There has to be a set somewhere, maybe??????? We did find a gasket and can use it as a template to build flanges, we could have tapped a gasket out too I guess. Just looking for something .... better.
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Old 12-08-2005, 10:46 AM
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go to ryr.com (Robert Yates Racing), send an e-mail to Doug Yates,

??? c-3=raised exhaust ports and maybe raised intake ports also ???
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Old 12-08-2005, 07:54 PM
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IF all else fails

If you cant get any satisfaction with Yates Racing, contact Racer Walsh in Florida.
Another alternative, find a Cleveland or M block exhaust gasket and check the alignment. Be aware that there are two sizes of exhaust gaskets for the cleveland head; the 2 bbl and 4 bbl heads are different, with the 4 bbl head having much larger exhaust ports.
IF the gasket will fit, then its a sure bet cleveland headers will work as well.
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Old 12-09-2005, 08:22 AM
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4barrel and 2 barrel same bolt pattern though
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Old 12-09-2005, 07:52 PM
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2 bbl vs 4 bbl

I forgot to mention that part of it, however, 4 bbl headers and exhaust manifolds wont seal on a 2 bbl head, due to the much larger port. Also dont run a factory 4 bbl intake on a 2 bbl head as the intake runners are a lot larger than the head ports, and this will cause severe reversion problems with the fuel air mixture. That being a moot point to the discussion.
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