390 Block Question

[ChiefDanGeorge]

What should I look for when searching for a 390 block to use for my build? The more I read, the less sure I am on what I should be looking for. I'm looking to build a replacement for my '63 Colony Park. My goal is to have something around 350 HP.

 
Thanks for any advice!

[Barry_R]

At that power level you are simply looking for something with standard or no more than a .030 over bore (so you have room to tune it up), and no big damage - a block with cracks, damage, and scored cylinders is not worth purchasing when good ones are under $400.

[ChiefDanGeorge]

Thanks for the reply. Are there any particular years to look for or avoid?

At that power level you are simply looking for something with standard or no more than a .030 over bore (so you have room to tune it up), and no big damage - a block with cracks, damage, and scored cylinders is not worth purchasing when good ones are under $400.

[Barry_R]

Look for cracks alongside the head bolts, and alongside the freeze plugs.
Make certain you get a post-'64 block with 4 bolt motor mounting holes.
I prefer nice greasy looking ones over those having a fresh coat of Krylon

[ChiefDanGeorge]

Will there be any potential issues with a later year block and the Merc 'Omatic transmission mounting smoothly?
I'd like to assume that they kept the transmission bolt holes the same between Merc O'matics, Ford 'OMatics, C4s... but I want to make sure.

Look for cracks alongside the head bolts, and alongside the freeze plugs.
Make certain you get a post-'64 block with 4 bolt motor mounting holes.
I prefer nice greasy looking ones over those having a fresh coat of Krylon

[427Fastback]

Interesting name Chief....Are you here in BC ??.......Cory

[ChiefDanGeorge]

Nope, South Carolina.

Interesting name Chief....Are you here in BC ??.......Cory

[427Fastback]

Cool....I was born in Chief Dan Georges neighbourhood.....

[woodboatwayne]

if you only need a block don't overlook the 360, it is exactly the same