Engine size, firing border, c-30


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Pile of Parts
Pile of Parts

Posts: 28

Joined: Thu Nov 17, 2016 12:02 pm

Post Mon Nov 06, 2017 4:40 pm

Engine size, firing border, c-30

On the left side of the block...i.d. at rear "522S"...front "233113795".."green diamond"...in the middle (production #? "61963-HH bb"...Is it 290cc or 292cc 6cyl engine ?(for firing order, head torque specs). Would add pic but mobile app does not want to attach. Am going to order binder book owner's manual but thought i might get a jump on things via the forum. Any help would be appreciate...wagale@gmail.com. thx!

Golden Jubilee
Golden Jubilee

Posts: 1956

Joined: Fri Apr 08, 2016 4:52 pm

Post Mon Nov 06, 2017 6:27 pm

Re: Engine size, firing border, c-30

153624 firing order. All straight sixes that I know of.
Green Diamond is a slightly updated version of the "HD" series flathead six. This design was purchased from Willys. Therefore, many, many Willys flathead six, IHC HD, IHC GRD parts interchange.
HD/GRDs were made in two basic sizes 213/214 ci and 232/233 ci.
There is a smaller displacement that is rarely seen. 174ci?
The chances on your C series are overwhelmingly in favor of the the larger sizes.
C-Series came with HD. The GRD was retrofitted because it is mostly a bolt-in.
MY first C-30 came with a GRD, retrofitted.

Pile of Parts
Pile of Parts

Posts: 28

Joined: Thu Nov 17, 2016 12:02 pm

Post Mon Nov 06, 2017 9:56 pm

Re: Engine size, firing border, c-30

MM--thx much for the info. Any way to distinguish between the 213 and the 232? Suppose i should have measured the piston diameter/throw...

Golden Jubilee
Golden Jubilee

Posts: 1956

Joined: Fri Apr 08, 2016 4:52 pm

Post Tue Nov 07, 2017 12:08 am

Re: Engine size, firing border, c-30

The displacement is stamped on a pad near the front of the engine. "G R D....."
One of your listed numbers has "233" in it. It's most likely a 233.

Pile of Parts
Pile of Parts

Posts: 28

Joined: Thu Nov 17, 2016 12:02 pm

Post Tue Nov 07, 2017 8:48 am

Re: Engine size, firing border, c-30

Ha! I was missing the obvious. Thx again, MM!
Bill Gale

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