AMC 360 rebuild advice
Posted: Fri Feb 17, 2017 6:13 am
I have obtained several core engines with anticipation of rebuilding one.
I have a 79 J20 with manual valve body TH400, 203/205 doubler, 4.56 gears and 42" tires. I currently have a crane energizer 272 cam, edelbrock performer intake, long tube headers and dual 2.5" exhaust. For heads it is sporting the screw-in stud style 58cc chambers.
Years ago I had a converter shop (now closed) do a stall converter for me and it's working OK. RPM in gear is 650 and above 1k when accelerating from stop. This should change though once I throw some CR at the engine?
We have been wheeling in the snow quite a bit this year and I'm having to generate some serious wheel speed to go anywhere. I'm using 3rd gear in the trans while in 4:1 and holding it pinned. It's working pretty well but like everyone else more power is better!!
My existing engine is very tired. I had to add a catch can to the valve covers to mitigate the blow-by.
For my rebuild I am a little torn on what configuration to shoot for.
I have access to the later 63cc chambers on a couple of my cores.
I'm shooting for 10:1 CR and a cam suited to the style of off-roading as noted above (wide open)
The 343 pistons seem like a good option but are cast.
Wisecos can be had for same money but require .030 overbore ($$)
With Wisecos @ .030 and the 63cc chambers I am a lil high for my CR goal but maybe the correct camshaft will keep the DCR down so I can still run pump gas.
With 343 pistons and stock bore I am right at my CR goal as well
For cam I was looking at the 280H but I am open to suggestions
I'm looking at Mollnar rods or FalconGlobal depending on funds.
I have a 79 J20 with manual valve body TH400, 203/205 doubler, 4.56 gears and 42" tires. I currently have a crane energizer 272 cam, edelbrock performer intake, long tube headers and dual 2.5" exhaust. For heads it is sporting the screw-in stud style 58cc chambers.
Years ago I had a converter shop (now closed) do a stall converter for me and it's working OK. RPM in gear is 650 and above 1k when accelerating from stop. This should change though once I throw some CR at the engine?
We have been wheeling in the snow quite a bit this year and I'm having to generate some serious wheel speed to go anywhere. I'm using 3rd gear in the trans while in 4:1 and holding it pinned. It's working pretty well but like everyone else more power is better!!
My existing engine is very tired. I had to add a catch can to the valve covers to mitigate the blow-by.
For my rebuild I am a little torn on what configuration to shoot for.
I have access to the later 63cc chambers on a couple of my cores.
I'm shooting for 10:1 CR and a cam suited to the style of off-roading as noted above (wide open)
The 343 pistons seem like a good option but are cast.
Wisecos can be had for same money but require .030 overbore ($$)
With Wisecos @ .030 and the 63cc chambers I am a lil high for my CR goal but maybe the correct camshaft will keep the DCR down so I can still run pump gas.
With 343 pistons and stock bore I am right at my CR goal as well
For cam I was looking at the 280H but I am open to suggestions
I'm looking at Mollnar rods or FalconGlobal depending on funds.