The Ford Barn

'31 Patina · 11-21-2014, 12:00 PM

when the motor is running on a stock model A engine do the pistons come up higher than the deck? Or does the top of the piston head remain level at or below the deck?

Thanks.

Tom Wesenberg · 11-21-2014, 12:23 PM

They rise above the deck by about .030" as I recall.

hardtimes · 11-21-2014, 07:12 PM

Yes, the pistons do 'pop up' above the block surface (Ford design). Tom is as close as necessary for Fordbarn work...lol

gwhite · 11-21-2014, 07:49 PM

I believe the factory spec was .035". We ended up milling .015" off the top of my Egge pistons to provide adequate piston to head clearance with a .010" decked block and an original Winfield 6:1 head that had been milled .025".

Final piston to head clearance ended up being .050"

Walt Dupont--Me. · 11-21-2014, 07:59 PM

You want to be carful when milling heads to much, some pistons are flat right to the edge, if you mill the head to much the edge of the piston will hit radius in the head. I like Snyder's pistons because the pistons has a big champher on the edge. Walt

'31 Patina · 11-23-2014, 01:49 AM

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Thanks guys for the info.

11-21-2014, 12:00 PM	#1
'31 Patina Senior Member Join Date: Jul 2010 Location: Rosemount, MN Posts: 228	Piston Question when the motor is running on a stock model A engine do the pistons come up higher than the deck? Or does the top of the piston head remain level at or below the deck? Thanks.

11-21-2014, 12:23 PM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Piston Question They rise above the deck by about .030" as I recall.

11-21-2014, 07:12 PM	#3
hardtimes Senior Member Join Date: May 2010 Location: South California Posts: 6,188	Re: Piston Question Yes, the pistons do 'pop up' above the block surface (Ford design). Tom is as close as necessary for Fordbarn work...lol

11-21-2014, 07:49 PM	#4
gwhite Senior Member Join Date: Aug 2010 Location: Texas: Where Bob Wills is still the king! Posts: 354	Re: Piston Question I believe the factory spec was .035". We ended up milling .015" off the top of my Egge pistons to provide adequate piston to head clearance with a .010" decked block and an original Winfield 6:1 head that had been milled .025". Final piston to head clearance ended up being .050"

11-21-2014, 07:59 PM	#5
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: Piston Question You want to be carful when milling heads to much, some pistons are flat right to the edge, if you mill the head to much the edge of the piston will hit radius in the head. I like Snyder's pistons because the pistons has a big champher on the edge. Walt

11-23-2014, 01:49 AM	#6
'31 Patina Senior Member Join Date: Jul 2010 Location: Rosemount, MN Posts: 228	Re: Piston Question Sponsored Links (Register now to hide all advertisements) Thanks guys for the info.