Guest Posted January 9, 2003 Share Posted January 9, 2003 I am restoring a 1940 LC Cab and I have an HV-12 engine. I believe the engine is a '38 as it has 8H6 on the aluminum heads (is there any way to tell the year of the engine?) My question is will '40-'41 aluminum heads (06H) bolt on with no problem as I believe the bore was different those years than what I may have.THX! Link to comment Share on other sites More sharing options...
peecher Posted January 10, 2003 Share Posted January 10, 2003 It's been a long time but I believe that all the V12 heads are interchangeable.I had late model cast iron heads on my 38 and they worked fine.Compression ratios changed slightly in 40-48 but this may have bore dependent? The 36 thru 39 engines had a 2-3/4" bore while the 40 and 41 engines had 2-7/8" bore. When you get the heads off you can tell if it's the smaller bore;if it has hydralic lifters it's a 38 or 39. The heads alone probably can't identify the year of the block as who knows what some one may have done over the years. DP Link to comment Share on other sites More sharing options...
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