This a an example of how automotive machine technology is changing our industry. A local customer came to us to have some heads done for an LS Turbo build, grudge car. The customer is the owner of a local automotive repair shop and after seeing the equipment at Straub Tech decided to bring his full machined and assembled short block to us that had been machined by a local performance shop in our area.
The block was put in the Rottler F69P to start checking and the pictures below shows what we found. The stock block 5.3 had been punched to 4.00", but the old style boring bar used on the block followed the cylinders and now the cylinder are off .025" to .035 off the Y axis and .005" off the X. In laymen's terms, the cylinders are crooked in the block on both banks. Probing the deck, they are .004" off on each bank.
Now this is turbo application so it will have some heat. Having proper crosshatch finish to hold some oil is critical or this thing will hang a piston. The profilometer readings based on hone job done on this block with a 2 stone headed hone are NOT CORRECT FOR A BOOSTED APPLICATION.
This engine was a ticking time bomb and would have never lived in application.
People need to ask what type of equipment do you have to verify your work. It's your hotrod, do you want to pay for crap or quality.
What to ask?
Do you have a profilometer and can you give me the readings when honed?
Do you have the equipment to check the cylinder location for a correctly blueprinted block?
The block was put in the Rottler F69P to start checking and the pictures below shows what we found. The stock block 5.3 had been punched to 4.00", but the old style boring bar used on the block followed the cylinders and now the cylinder are off .025" to .035 off the Y axis and .005" off the X. In laymen's terms, the cylinders are crooked in the block on both banks. Probing the deck, they are .004" off on each bank.
Now this is turbo application so it will have some heat. Having proper crosshatch finish to hold some oil is critical or this thing will hang a piston. The profilometer readings based on hone job done on this block with a 2 stone headed hone are NOT CORRECT FOR A BOOSTED APPLICATION.
This engine was a ticking time bomb and would have never lived in application.
People need to ask what type of equipment do you have to verify your work. It's your hotrod, do you want to pay for crap or quality.
What to ask?
Do you have a profilometer and can you give me the readings when honed?
Do you have the equipment to check the cylinder location for a correctly blueprinted block?