I'm starting this so I don't clog-up others' with my own stuff.
I've had this GX140 for about 25 years and it was always used for experimenting. It was disassembled 10+ years ago and I thought it got thrown out, but low and behold I found the parts! The original head was ported, cut, and modified into scrap, so what now?
Enter the hemi Predator head. Stock 140 valves are 24/22mm; the hemi's are 27/25 and the ports are larger to boot. By my estimation, with valve springs it could move the 140's power peak to over 7000rpm without porting. So I got one. It will be styled after the second-gen Chrysler Hemi in orange with a black valve cover.
Anyone else thinking about this should know that the compression ratio will only be about 6.8:1 and there will be no quench because the piston is so small.
I milled the letters off of the valve cover so it wouldn't mess up the wrinkle finish.
Some more mockup for better throttle response.
I've had this GX140 for about 25 years and it was always used for experimenting. It was disassembled 10+ years ago and I thought it got thrown out, but low and behold I found the parts! The original head was ported, cut, and modified into scrap, so what now?
Enter the hemi Predator head. Stock 140 valves are 24/22mm; the hemi's are 27/25 and the ports are larger to boot. By my estimation, with valve springs it could move the 140's power peak to over 7000rpm without porting. So I got one. It will be styled after the second-gen Chrysler Hemi in orange with a black valve cover.
Anyone else thinking about this should know that the compression ratio will only be about 6.8:1 and there will be no quench because the piston is so small.
I milled the letters off of the valve cover so it wouldn't mess up the wrinkle finish.
Some more mockup for better throttle response.