F-20 Heisler head questions

robgIN · Dec 25, 2009

Merry Christmas everybody. I've got a couple questions about what I think is a Heisler head for F-20, FH1400HC cast in top of head, no IHC anywhere. Much smaller spark plug holes. Valves 1.873" dia intake, 1.627dia exhaust, stem .370" overall length ranges from 6.520"-6.530". My IHC head valves are 1.75" in and ex, stem same .370 but shorter overall by .300". 6.220"-6.230". What valves go in these ? Are these M valves ? I need a guide, are they the same as an IHC head? And what spark plugs do these heads use ? Thanks for any input you guys have.

Nebraska Cowman · Dec 26, 2009

Humm, I don't know anything but will be interested to see what you learn. When I get near my books I could try looking up the valves. And i have plenty of reference that would show heat ranges on plugs. Are they 18 mm holes?

robgIN · Dec 26, 2009

The plugs i took out were AC plugs AR52 i think, I'll have to look at them again and get their size.

randy hall · Dec 26, 2009

those valves are too long to be m valves. i have been looking for a heisler head for a f-20. do you want to sell it or do you know where another one is?

robgIN · Dec 26, 2009

No its not for sale , and I don't know of any others sorry. In answer to Cowman, I checked the plug holes, they are the small 14mm.

F-20 Heisler head questions

robgIN

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Nebraska Cowman

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robgIN

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randy hall

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robgIN

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