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**The Rocknrod** · 11-08-2017, 12:09 PM

I was told by a very knowledgeable member that the 174 casting number is 1966 ONLY . Those are interchange years I was quoting not actual block years.
I was also corrected on the YD - The '66 327 Truck prefixes are: YS, YR, YH, YC & YD.
And that the block may be original to the truck but the heads aren't. Which "may" be the reason for the roller cam latter on.
Reading the C-10 Parts Book on page #8 at the bottom the YD is shown in the 1966 year but not on the 1965 year. Could be incorrect or the date of the truck is incorrect?
So these engines didn't have a VIN on the bloc.
I'm hearing this truck is a 1966 then? Not a 1965? Makes a difference on the info being correct.
Question:
a. Can the OP show the original cam numbers from the original roller cam?
b. Did those main studs originally come with the block?

11-08-2017, 12:09 PM	#238
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: 1965 1/2 C10 Pickup I was told by a very knowledgeable member that the 174 casting number is 1966 ONLY . Those are interchange years I was quoting not actual block years. I was also corrected on the YD - The '66 327 Truck prefixes are: YS, YR, YH, YC & YD. And that the block may be original to the truck but the heads aren't. Which "may" be the reason for the roller cam latter on. Reading the C-10 Parts Book on page #8 at the bottom the YD is shown in the 1966 year but not on the 1965 year. Could be incorrect or the date of the truck is incorrect? So these engines didn't have a VIN on the bloc. I'm hearing this truck is a 1966 then? Not a 1965? Makes a difference on the info being correct. Question: a. Can the OP show the original cam numbers from the original roller cam? b. Did those main studs originally come with the block? __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 11-08-2017 at 12:57 PM.