4.7L Stroker For 99 XJ build
Posted: April 24th, 2017, 7:58 pm
Cheers from Tucson, AZ
Alright. After lurking in the shadows for about a year, sifting through the forums, I have decided to emerge into the light to begin my stroker build.
This past Saturday, I pulled a 4.0 from a 97 zj at a junkyard for $200. The zj on the lot showed no signs as to why it would be at the junkyard (no body damage, visable motor damage, visable tranny damage, or any other damage for that matter), so I was slightly skeptical about the motor. On the plus side, someone had removed it recently to replace the rear freeze plugs, and no E12 bolts in sight, so removal was easy.
Took her home, and to my surprise, The motor was freshly re-built. Brand new seals, bearings, lifters, rockers, springs, and a heavy duty camshaft. also, the previous owner appears to have done a port and polish on the head, but further cleaning is still needed to be certain. But a lot of my work has been taken off of my plate.
Also upon dissembling the motor, I discovered why it was on the lot at the junkyard. bad Carbon build up on cylinders 1&2, with minor build upon cylinder 3, as well as bad/warped/whatever piston rings on cylinders 5&6.
so essentially, I'm in a really good place for my 4.7 Stroker.
However, I do have some questions that I was unable to find the answers for. I know I want a 4.7, and that means a 4.2L Crankshaft, as well as a +0.060 overbore on the cylinders. However, I am uncertain of what else is needed to be machined to the block, and, if I'm wrong, the head has not been ported, what would I need to tell the machinist when I go to get work done. Is there a definative list of what exactly the machinist needs to do, like a job sheet/blueprint (I'm a CAD designer, with experience in machining, but none when it comes to machining engines).
any extra information would be appreciated.
Alright. After lurking in the shadows for about a year, sifting through the forums, I have decided to emerge into the light to begin my stroker build.
This past Saturday, I pulled a 4.0 from a 97 zj at a junkyard for $200. The zj on the lot showed no signs as to why it would be at the junkyard (no body damage, visable motor damage, visable tranny damage, or any other damage for that matter), so I was slightly skeptical about the motor. On the plus side, someone had removed it recently to replace the rear freeze plugs, and no E12 bolts in sight, so removal was easy.
Took her home, and to my surprise, The motor was freshly re-built. Brand new seals, bearings, lifters, rockers, springs, and a heavy duty camshaft. also, the previous owner appears to have done a port and polish on the head, but further cleaning is still needed to be certain. But a lot of my work has been taken off of my plate.
Also upon dissembling the motor, I discovered why it was on the lot at the junkyard. bad Carbon build up on cylinders 1&2, with minor build upon cylinder 3, as well as bad/warped/whatever piston rings on cylinders 5&6.
so essentially, I'm in a really good place for my 4.7 Stroker.
However, I do have some questions that I was unable to find the answers for. I know I want a 4.7, and that means a 4.2L Crankshaft, as well as a +0.060 overbore on the cylinders. However, I am uncertain of what else is needed to be machined to the block, and, if I'm wrong, the head has not been ported, what would I need to tell the machinist when I go to get work done. Is there a definative list of what exactly the machinist needs to do, like a job sheet/blueprint (I'm a CAD designer, with experience in machining, but none when it comes to machining engines).
any extra information would be appreciated.