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Old 09-23-2017, 05:40 PM   #1
DANINCO
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Default 392 valves in a 345 head

Has anyone ever put the larger 392 valves in a 345 head?
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Old 09-24-2017, 11:34 AM   #2
Robert Kenney
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Default Re: 392 valves in a 345 head

Not me personally, but it is a normal process to go through in an attempt to find hidden power.
The 392 has a bigger bore and hence more room to fit the bigger valves and not hit the bore while open.

Standard 345 valve stems are 3/8 the 392 has a bigger stem on the exhaust valve .414-.415.

From a flow standpoint the IH SV heads are anemic at best. It would most likely be a waste of money.
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Old 09-24-2017, 06:44 PM   #3
FDChappie
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Default Re: 392 valves in a 345 head

IIRC 392 pistons are notched to clear the valves too.
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Old 09-25-2017, 05:13 AM   #4
DANINCO
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clip Re: 392 valves in a 345 head

Pics of valvetrain. 58 cast steel rockers bushed. Plated shafts.
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