3 "x's" on 302 block??

[Pinebluffracer]

What do the three x's "XXX" on the 302 short block? Is that just a stock clock?? I was hoping I might have something aftermarket, but it is not a 4 bolt main. Any idea?

 

[5ohturbostang]

it used to be a pornstar

 

[Mustang5L5]

Stock block.


They all come with either XXX or YYY on them

 

[IntenseBlue]

What's the difference?

 

[bobcatv8]

Male and Female.

 

[04sleeper]

The only blocks I have personally seen with the "YYY" on them was the 86 blocks.

85 and 87-93 I have only seen the "XXX" on them.

 

[89white50]

my spare block is from an 88, and it has XXX.