ford 401 head gasket trouble. July 25, 2011 04:54AM
new motor in 8600 ford 401. head off 9700. 9.5mm pump 3lm466 stock charger. 1/2 in studed block with cooper head gasket no fire ring.
Blowing head gaskets and blowing off top hose with cooper head in place. head seems to be fine. need help on what to look for.
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Re: ford 401 head gasket trouble. July 25, 2011 01:25PM
If you're only using 1/2" studs? I think you have an old 8000 block. 9000 and on had 9/16 fastners. You will probably have to fire ring or piano wire the head if much over 30-40 psi of boost. Good 9/16 studs with arp lube will take 160 ft/lbs of torque. I would not try that with 1/2" studs.
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Re: ford 401 head gasket trouble. July 25, 2011 04:17PM
try putting a stock head gasket in this tractor, if you blow that gasket you either need to plane your head or block. If the head and block are true you will not blow a stock head gasket witha 3lm and 9,5mm pump. Without using firerings with a cooper gasket you won't be able to seal it there is to much surface area and you won't get a good seal.
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Re: ford 401 head gasket trouble. July 26, 2011 01:32AM
block has been decked head planed as well blew stock gasket with new head bolts not studs never used the studs on the stock gasket. is there a better stock gasket or do you have a part number?
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Re: ford 401 head gasket trouble. July 26, 2011 05:56AM
Had the same problem on a ford 401 with 1/2 bolts. I had my timing set at 32. All I did was turned the timing down from 32 to 28.
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