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Can this Work

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Joined: Thu Feb 12, 2009 11:52 pm
Bikes: 2005 ultra classic
1949 panhead in a 63 due glide
Location: west texas

Can this Work


Post by wildtide » Fri Feb 27, 2009 1:57 am

I bought a 49 pan, motor number says EL ( 61 cu.) can this motor have 74 jugs and pistons in it ?

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Re: Can this Work


Post by 62pan » Fri Feb 27, 2009 3:26 am

You can run 74" barrels on a 61" bottom end. It used to be quite popular many years ago giving you a "square" motor, that is, a 3 1/2 inch stroke and a 3 1/2 bore (with a .60" overbore). The problem is you will have very low compression with a FLH piston. I put a 74" top end on a '36 knuckle back in the early seventies and used some 12:1 pistons I got from MC supply. With the lightning cam, big port 74" heads and an M74-B, that was a very quick bike.

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Re: Can this Work


Post by RUBONE » Fri Feb 27, 2009 5:13 am

It also could have 74 flywheels in it along with the cylinders which makes it a regular 74. it is a straight interchange. I also have built 68ci engines. I think they run great! I shortened the cylinders to match the compression, as I remember it is about .090.

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