Technical > Matt Shaff's Engine Shop

Milling OEM 351C Heads

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coupemerc:
A question for you Ford guys...what would you recommend as a maximum (but safe) amount that a stock cast iron 351C 4V head could be milled to reduce the chamber volume? This would be for drag race only use. Thanks

Frontenginedragsters:
 Funny you should ask.
I built several 351 Cleveland engines back in the late 1980's.
I assume your talking about 4 barrel closed chamber heads?
We used to angle mill them .125" to zero.
Lots of machine work but a good way to get compression with a flat top piston.
You first have to look at piston to valve clearance to see how much you have.
You can not "un mill" them.

Matt

coupemerc:
Thank you Matt.  Yes, they would be 4V closed chamber. I'm assuming the .125" number is on the exhaust side of the head. I can see some advantages of doing that. Would the casting get too weak for a max effort head with that much material being removed? Do you know what a maximum but safe number would be for straight milling?

Frontenginedragsters:
I would like to know more about your Max effort.
Matt

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