General help with some numbers.

[hxbunny]

Ok thanks for that.

[HK1837]

308H blocks with 308 on the side should really be worth far more than those with HP. The vast majority of HP cast 308's are really only suitable for a HT Brougham as these were the only cars to get 308 at the start of HT. Not long after the 308 was made available across the range (close to the end of HT) the cast mark changed to 308. So for most HT and HG GTS with 308, the "correct" engine is a 308H with 308 cast mark. It's only a month or so of HT GTS production where the 308 cars got HP blocks.

[hxbunny]

ok, i've got a HP block that i was going to put in the van for something different but might look for a more correct dated block. The HP block has a date code of L18, or that's what it looks like, but the HT wasn't released until May 1969, any ideas or thoughts are appreciated

[ozbox]

they must have started building them early if yours is november 68 and the pics i have that motor was feb 69...wasnt the ht release date held up for some reason?

[HK1837]

308 was well developed and finshed by that stage. Probably were engines used in prototypes or even in HK's for testing. Remember GM-H never threw anything away, anything of use got used or sold.