Albone

Has anyone had their block crack in the same place? Got any ideas on what could cause this?

It was a 383 with eagle crank, stock rods, and speed pro pistons. I bought it that way and it only lasted about 6 months before it started knocking. I finally got around to taking a look and i found this (among other things), which I think was the source of the knock.

Albone

here is the thread i made years ago when I first heard the sound. I lost interest for a while but found the motivation again and plan to get the car up and running for next summer.

https://www.camaroz28.com/forums/lt1...-think-638857/

Chimera96

could have been several reasons the block cracked there in the rear

bad line bore for crank
running external balanced FW/Flexplate when engine was "internal" balanced (if it was)
eagle cast crank


that block is scrap, start over with better "forged" parts...and build

Albone

i already got another block. the crank was not damaged at all, all journals mic like new. i wish i knew what the previous owner did as far as balancing goes. i dont think forged is necessary for my purposes though.

Chimera96

if your Eagle crank is forged, it is "OK". Their cast stuff, no.

have a qualified shop prep the new block and balance rotating assembly "internal" balance aka neutral. You will need to run a neutral balance FW/Flexplate.

who knows wtf PO builder did but something FUp'ed

MachinistOne

Yeah, that's a new one for me too - somebody did something stupid.