Response to Latrll1
First - Background on the shortblock being discussed….i obtained it as a freshly rebuilt +30 455 shortblock. I run a stick and and aftermarket steel flywheel , so I tore it down and took all rotating components down and had it zero balanced ( AKA: neutral or internal balance ) , reassembled it , installed it , and fired it up . it had approx. 90 minutes of run time and no road time .I tried to run it a least twice a year and at least long enough to get it to operating temp. The time between initial start up and removal was almost 4 years.
During that entire time, the car was stored in my garage.
After obtaining the parts for the next motor , I put this one up for sale on PY. It was up for less than 24 Hrs when I was contacted by Todd . After receiving a deposit , I pulled the motor , removed the top end , and pull the pan to check for any problems.
Pulled ( 1) main cap and ( 2 ) rod caps …no evidence of any problems
Reassemble and retorque …flip it and spin it over …..rotate ….. some marks are visible in the bores ….i beleave that 2 of them were ring marks where fuel/blowby had lain on top of the ring and caused a stain in the shape of the top of the ring – at least 2 of these were present and were approx 1/16 wide and possible 3 – 4 in long ( all on outboard side - lowest side)
The largest one was approx the size of a middle finger and was in cyl # 4….the stain indicated that the piston was down or nearly all the way down ( valves closed )……when I first saw it , I cleaned the bore and gave it the fingernail test - nothing there
Did the same test on all the other cylinders - no imperfections that I could find
- Gave Todd the OK - No problems found
NOTE: STAIN - is a term use by machinist to described any discoloration of the metal from its normal coloration
Upon meeting with Todd , I am the one that pointed out the markings on the cylinder walls. He immediately claimed that there was rust scale and pitting in the # 4 bore and said he wasn’t interested . I could have easily rotated the shortblock (prior to loading it ) so # 4 piston was up and he would not have been able to see the mark , if I had wanted to conceal it. I did try to explain the stain but he had already made up his mind. Fine, no need to waste any further time on this.
It did occur to me that this could have been an attempt to negotiate a lower sale price , as soon as I pointed out the stain , he quickly found another potential “ problem “
Since I am still interested in selling the shortblock….it first needed to be determined if a problem really existed. Since I am not a machinist by trade, I took it to the experts.
Once I returned home, I pulled the shortblock apart and dropped it at the machine shop. Machinist tanked it and assessed it. The bores are now pristine shiny steel The machinist reported that he ran a hone through all 8 bores in approx 10 minutes ( total time). There was no rust , scale , or pitting. If there had been , it would required either boring to a larger size or sleeving the cylinder. Neither operation was needed in this case.
If any of this seems out of place or incorrect , print this out and go discuss it with your local machine shop
Todd rejected the block on a cosmetic reason , therefore I kept half of the deposit to cover the 40 gallons of fuel I burned making that trip. Norfolk Va to Wash. DC ( round trip)
Last edited by Ccass; 03-02-2009 at 10:35 AM.
|