The Ford Barn

Straightpipes · 11-29-2021, 06:58 PM

Digging around in my shed i found a set of used Jahns pistons . They are marked on the dome 3 3/8 1/8 LC. These are with 29A rods. What is LC? I am guessing for a 4" crank.

Brian · 11-29-2021, 07:25 PM

yes, 1/8 lower crown for 4" stroke

Straightpipes · 11-29-2021, 07:43 PM

Thanks Brian. must have been a healthy engine.

Bored&Stroked · 11-29-2021, 10:22 PM

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I've heard the LC mean "lower crown" or "long crank" . . . either way, they're for a 4" stroke Merc crank. The rods are not part of the equation in that all Ford produced flathead rods are 7" in length.

11-29-2021, 06:58 PM	#1
Straightpipes Senior Member Join Date: May 2010 Location: Ballston Spa, NY Posts: 789	Piston markings Digging around in my shed i found a set of used Jahns pistons . They are marked on the dome 3 3/8 1/8 LC. These are with 29A rods. What is LC? I am guessing for a 4" crank.

11-29-2021, 07:25 PM	#2
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,834	Re: Piston markings yes, 1/8 lower crown for 4" stroke __________________ Unfortunately, two half wits don't make a whole wit!

11-29-2021, 07:43 PM	#3
Straightpipes Senior Member Join Date: May 2010 Location: Ballston Spa, NY Posts: 789	Re: Piston markings Thanks Brian. must have been a healthy engine.

11-29-2021, 10:22 PM	#4
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,067	Re: Piston markings Sponsored Links (Register now to hide all advertisements) I've heard the LC mean "lower crown" or "long crank" . . . either way, they're for a 4" stroke Merc crank. The rods are not part of the equation in that all Ford produced flathead rods are 7" in length.