Block work

[Mike McKown]

Yeah, the acid tank did

Didn't bother me any but I guess one of those guys that run around a judging field with a periscope hanging out of their back pocket could see it.

[John M.]

Re: The old pro here...

Jack, I just talked with a guy at RLengines and he does the same thing. Sounds like a good process.

[Chuck S.]

Ain't Progress A Wonderful Thang??!!...:D

The hot tank must have ate my broach marks...all I know is my pad don't have any.

I'm told it HAS to have broach marks, or it's a fake. Only trouble is, I'm pretty sure if I asked any of the previous owners about the "broach marks", I'm pretty sure they would have looked at their face in a mirror, thinking I wuz talking to about gettin' too playful with the honey.

[Jack H.]

Re: The old pro here...

The old pro here swears by the method, learned it from his dad who started the machine shop LONG ago (in the 20's). He's a VR (vintage racer) guy and doesn't believe in magnetic inspection. He claims the method will cause stress faults to either open up or 'cure' themselves with the later happening most often. And he does his 'thing' with heat followed by a clean-up and pressure check. He's NEVER had a reworked casting that he found to survive his method subsequently crack on him...

I guess there's some justification for the 'cure' aspect... If you elevate the casting temperature 'close' to cast iron's melting point, then, statistically, there'd be some molecules that are above the melting point by random chance. It'd seem that could act to 'reflow' the molecular structure and actually eliminate stress/fault lines.

[Verne Frantz]

Re: Ain't Progress A Wonderful Thang??!!...:D

A hot tank doesn't eat broach marks. Too many machine shops today use shot blasting to clean blocks, either in addition to hot tanking, or in lieu of it due to EPA restrictions on their chemicals. In any case, shot blasting will ruin everything. After that procedure, you'll have to re-surface the valve seats (no more sharp edges) and spring seats, and most likely re-finish the valve guides and resurface the head deck as well!
Think of it like taking your carburetor apart, then having it sand blasted, then expecting it to go back together like it should!!!!

[Chuck S.]

Re: Ain't Progress A Wonderful Thang??!!...:D

"...A hot tank doesn't eat broach marks..."

Yeah, I know, Verne...precisely my point...but I still don't have any broach marks that I can see. Just another example of my misdirected pubescent wit...you know the old excuse, "The dog ate my homework". Mike's were chewed off by an acid tank.