Engine Valve Help.

[Simon93]

Hi all,

I have a slightly unorthodox question.

Near to me is the site of a US Navy storage depot that was built in 1944, which was very important in supplying equipment the US Navy needed for D-Day. Some discarded items can still be found on the surface, and I have found a couple of the engine valves pictured. I found one valve that I have been able to identify as coming from a Willys jeep, but I found a couple which are of unknown vehicle origin. Can anyone help ID what vehicle/engine this valve would have come from, please? It would be a great help in building up the picture of what was stored at the depot.

 

It is made of chromium steel, and measures;

Height - 124mm - 4 7/8"

Head diameter - 32.2mm - 1 1/4" 

Shaft diameter - 8.5mm  - 5/16"

Marked on the bottom is 'GM 41 EX', which I assume is General Motors and 1941?

 

Any help would be greatly appreciated.

 

Many thanks,

 

Simon

 

[Richard Farrant]

I would say it is possibly for a GMC 270 engine and is an exhaust valve

[radiomike7]

Early 228/236/248/270 used an exhaust valve with these dimensions, 0.3402" stem is for a 0.3437" or 11/32" guide. Later types had a bottom taper on the retainer groove for the Rototype cap and retainer. Seat angle is 30 degrees.

Head Dia.: 1.4270"

Stem Dia.: .3402"

OAL: 4.8850"

 

[Simon93]

Wow, thanks chaps for the detailed replies! Measuring more accurately, those dimensions are pretty much bang on. Fascinating what turns up!

 

Many thanks,

 

Best regards,

 

Simon