It's a Royal Enfield.   The guy also had a couple of Ariel Square Fours and a bunch of old Indian stuff but the one no one could identify was the cast iron single.  Here's a couple of pix.  Anyone?

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Tim, no clue. Sorta looks British, but the iron head throws me.

Frank/Rebop

Bristol, In ( by Elkhart) 

The layout of the head looks a lot like a '65 Harley Sprint we have here at the shop. The Sprint is a joint venture between Harley and Aermacchi, which is Italian.

The Moto Guzzi Falcone Sport has a similar arrangement, too.

Lino Tonti was involved with the design of the Aermacchi Sprint and he was later involved with Moto Guzzi but I'm not sure if he was involved during the time of the Falcone. My vote is Italian. However, both the Aermacchi and Falcone have aluminum engines. If the one pictured has any relation, it very likely came before those two, maybe 1930s or 40s.


Lawrenceville, GA

Being a big guzzi nut I don't think it's Moto Guzzi as all of the 500 singles were horizontally mounted. The fins are aligned for upright running. Although they did other engines and some dramatically different from the horizontal single they were know for.

I add to the chorus and say that there is a lot of interesting technology with old engines. As there were a lot more companies and a lot more ideas to get things done. Today there is very little variation from the norm.

I used to love going to field days with my Father in law who grew up on a farm.  He talked his father into buying the first tractor in the Waikato region in New Zealand. The passion was still there and knowledge of farm machinery immence.

My first love is motorcycles and I've owned a collection of the usual jap bikes but also Husqvarna,  a racing early 60's yamaha TD250 I still own a several Moto Guzzis including a a V7 sport and a  Sport 1100 (one of 1700 caburated made) I also have a 1927 "N" model triumph which needs to be rebuilt.

Harry Ricardo worked for Triumph in the 20's and there is a relation here with the design of the Y block but I've never established what.  

Grizzly (Aussie Mainline)

 Hi Tim,

Is there any possibility that the Cyl barrel in your pics is radial aircraft?  That cutout in the fins might nest with an adjacent cyl. 

Doug T

The Highlands, Louisville, Ky.

Doug, the cut out in the fins is where the tube for the push rods would go. it would thread into the head.  This guy was into old motorcycles anyway.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Here is a '75 picture of my Harley with Flathead 80 cu. in., 1941 if remembered correctly.  Really neat.  At the same time there was a new rebuilt 1934 VL Flathead 74 cu. in. in the basement. 

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

Mike, just love the pants! i think we all looked like that in the 70,s, good times.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Beat me to it.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

I had a blue and white pair like that, wish I could still fit in them!!!!!

Gary Ryan San Antonio.TX.