302 XXX block

stevesLX · Sep 17, 2007

So is there anything special about a XXX block VS a YYY block? Is one better than the other or is it just the same thing with differn't cating #'s?

Mustang78 · Sep 17, 2007

i thought XXX was roller and YYY is flat tappet, or the other way around...i asked this before(try using the search button), from what i know it has nothing to do with the strength of the block itself, so just pick the better candidate for the build based on measurements of the bore, and crank/rod journals, not to mention if the block is cracked, etc..

~Mark~

Shamus O'toole · Sep 17, 2007

XXX is a hydraulic roller block. Nothing special........

cenok is family · Sep 17, 2007

Shamus O'toole said:
XXX is a hydraulic roller block. Nothing special........

what is a YYY?

Mustang78 · Sep 17, 2007

flat tappet i'd assume

~Mark~

Red88 RICK · Mar 24, 2008

my block says yyy and its a roller.

machstang23 · Mar 24, 2008

there is no difference between the blocks, except that one has XXX and they other has YYY

95GTAODE · Mar 24, 2008

machstang23 said:
there is no difference between the blocks, except that one has XXX and they other has YYY

+1

The only difference is, it's more fun to say you have the infamous "porno" block!

85_SS_302_Coupe · Mar 24, 2008

No way it's the Vin Diesel block...officially endorsed by the movie XXX. Or maybe it's a Straight Edge block and doesn't drink or do drugs

TokyoJoe · Mar 24, 2008

Just means its good up to XXX horsepower

Fast63 · Mar 24, 2008

right, there is no difference. I think XXX is just an earlier roller block, like the one in my 85 stang, and YYY is newer, like my 91 block 347

Graydon5oh · Mar 24, 2008

TokyoJoe said:
Just means its good up to XXX horsepower

i didnt know you were on here

armyed · Apr 23, 2008

if im not mistaken the xxx block was a non roller block. My block is from a 78 ford truck and it was a non roller before and it has the xxx on the webbing. I also believe they are a little stronger then the rollers as the webbing was a little thicker.

stykthyn · Apr 23, 2008

my xxx block came out of a 5.0 exploder. definitely roller

85_SS_302_Coupe · Apr 23, 2008

armyed said:
if im not mistaken the xxx block was a non roller block. My block is from a 78 ford truck and it was a non roller before and it has the xxx on the webbing. I also believe they are a little stronger then the rollers as the webbing was a little thicker.

Mine's a XXX and an '85 which was the first year for roller blocks.

grey5.0beast · Apr 23, 2008

xxx block here and a 91 roller

blackened88lx · Apr 23, 2008

Mine says ZZZ

dtlionsfan · Apr 23, 2008

I have a YYY block in my original 89 and have done an 88 and 92 original mustang roller blocks and they were XXX.Theres no rhyme or reason to them.

Cobra912 · Apr 23, 2008

Well I can't quote where I read it but I believe they are the same however the YYY blocks are believed to have a higher nickel content which allegedly makes them stronger......how much or how true I couldn't tell ya but I do recall reading it somewhere.

My 86 had a xxx and the 331 I'm building is a yyy and they are both rollers.

bynummustang · Apr 23, 2008

Cobra912 said:
Well I can't quote where I read it but I believe they are the same however the YYY blocks are believed to have a higher nickel content which allegedly makes them stronger......how much or how true I couldn't tell ya but I do recall reading it somewhere.

My 86 had a xxx and the 331 I'm building is a yyy and they are both rollers.

Best answer yet.

The YYY blocks were cast in Mexico (they did something right), and the castings done there, are said to have a higher Nickel content, thus making them stronger. I'm not sure, and no one is sure on how much stronger, but I still wouldn't want to push more than 425 or so on any stock production type block.

/thread

302 XXX block

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I want to measure mine. It doesn't look that tall.

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