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Hey guys, I have a stock 5.0 block with a two bolt main out of a 1989 Mustang. I was planning on pushing around 375 HP after rebuilding. The block has been bored so that it's a 331. I was considering putting a girdle on the bottom end to make the block a little stronger, so at least I'll have peace of mind. I found this one: http://www.americanmuscle.com/moroso-maincap-girdle-302.html#whatsinboxArea and it says that it was designed for 5.0 blocks. It will still work on my 331, right? Since it was a 5.0 block? What do you think? Thank you.
 

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With a 375 horse engine, this is overkill...... particularly with a 3.25 stroke. Guys build 347's all the time with out these. This is a 600 HP, 7,500 RPM, tuned-to-slay piece of engineering.
 

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You can't get 331 cu in by boring alone, you'll have to get a stroker kit.. It should work, but ask them if it's compatible with the stroker kit to be sure..
 
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