I'm looking into options and blueprints for a 4.2l rebuild with a 4.0l head. I currently have a 4.2 with the 4.0 head converssion, mc2100, and a DUI ignition. I did the head conversion about 6 months ago and am happy with the results of the power increase, but, I did it on a tired engine with 160,000 miles on it using my stock 4.2l intake and stock 4.0l exhaust manifold. I dont think I'm truly getting all I can out of the setup that I have. So I was thinking about rebuilding the 4.2 and putting on the clifford performance intake/exhaust combo and and a high performance cam, bumping up the compression ratio and displacement with oversized pistons while still keeping it carburated. I know the EFI/Carb argument but I believe in the K.I.S.S. approach (Keep It Simple Stupid). Also I also just installed a new painless wiring harrness and am not running any CPU and I dont want to. So I'm wondering if anybody has the blueprints for a performance engine build using a 4.2l block and a 4.0l head, ie. type of cam, piston size, pushrod lengths, bore specs, etc...
My other option was to just try to build a stroker and keep it carburated for simplicity but the more I read up on it it sounds really expensive and time consuming. This is my only car and I cant afford to have it sitting in the driveway for a prolong period of time.
I'm looking at trying to get at least 200 ponies out of my 4.2 without having to do a major alteration/engine swap. So if I can do that with a performance engine rebuild using my 4.2l block and my freshly rebuilt 4.0l head with better flowing intake/exhaust and a performance cam with a little more displacement than that sounds like a cheaper and less time consuming project. I'm hoping that this is realistically attainable. Any advice or expieriance regarding this subject would be greatly appreciated.
87 YJ IIIII
3.5in BDS, 1" daystar MM, Posi Lock, D-30 w/Tru-track, Stock D-35, 33x12.5x15's, 4:56, 4.0l head swap, AX15 Swap, HEI, Howell TBI. AA SYE, Tom Woods DS.