wide deck or std. ?

[JimWoo50]

How do I tell for sure? Only numbers I can see on the case of my 0-320-b3b are L-1550 and wdc 94955. Have been studying PC 103 and fig 1-5 shows in the hole rearmmost top just above the cam a requirement for a bolt in the std. case whereas the wcf shows no bolt only a nut and washers. Is there a stud here on the wcf's ? My case has no stud in this location. Thanks. Jim.

[asav8tor]

Look at the base flange of the cylinder where it bolts to the case.

Allen head bolts with a little metal base plate holding the jugs on? = narrow deck

Hex nuts with no base plate = wide deck

[rgbewley]

The WDC number means that the cases have been repaired in some form or fashion by Divco in Tulsa. That is their work order number.

[JimWoo50]

I have the base plates and the allen head bolts. I can now begin to order parts to rebuild my std. cylinder flange engine.

[osxuser]

Narrow deck vs. Wide deck. Engine serial no. will have an "A" at the end of it if you have a wide deck engine. SERIAL number, not model number. Not all Narrow deck engines have the internal keyed nuts, so that isn't an absolute.