OK.....I just took a look under the hood again........I definitely have a YX engine block.........so apparently according to the info you guys are giving me, I've got about 200 hp if I'm lucky.
I'm sure I'll learn all about the different ways of rebuilding an engine for best performance over the next few months.
Let me ask this............and I'm sure it's all a matter of personal preference..........what amount of horsepower should I be shooting for and still have a nice ride around town (I don't go to the track) thanks
Actually, the code 'YX' on the block tells us very little about what you have. For example; In 71 the code YX is for a 400 block. In 74 YX was a 455 block. And last and least, in 1977 it was a 301. Since engines are often swapped over the years, saying the engine came out of a unknown 72 Pontiac doesn't mean very much. So you will need to read the date code near the distributor hole or the casting number to narrow down what you have and if you can even use the block for what you want as a finished product. And as I asked in my earlier post, which heads do you have? The heads will be a major factor in the end product. I'm sure you are interested in whether you can even use the heads you have. If you need any help with finding the locations of the 'more important codes' we can help with pictures of example codes on blocks and heads....
