[oletrucks] GMC - Large valve inliners

[Williams Grant Civ AFRL/Det 2 <Grant.Williams@kirtland.af.mil>]

Does anyone out there know how to determine whether a GMC 270 or 302 head,
has the large valves without removing the head?  Engine type is easy;
although if it has been swapped to another vehicle, I'm not sure how to tell
what year it is.  I believe all the 52-59 302s had the large valves, but not
sure about the 270s. 

Grant Albuquerque, NM
1950 GMC 100
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959