have you searced installing a high lift cam in 4.0 jeep engine

 

How would it change the cam timing? The camshaft is in the block, so there would be no change in the distance from the camshaft to the crankshaft.

 

when i move from my 2.5L im going with a 4.3 i6 and im putting a 4.0 head on it that will make it high compression easy as can be and ima be running 97 octane and you gota retard the timing but not a big deal

 

The geometry can easily be fixed by getting pushrods that are shorter by the amount removed from the block and head. There are problems with relying on a bottle. For most offroading (except dune-running and deep mud) you just want a little more "grunt". A 100 shot is not all that practical or controlable for most situations. You also need to add the extra fuel required or you'll lean out and melt a set of pistons. The 100 shot is also going to put a much greater strain on the drivetrain than the 15 or 20 horsepower potentially gained by upping the compression.

 

^^Local kids been running a 75 shot for a little over a year no problem. Hes at rausch alot.

Head becomes closer to the block, which brings the cam closer to the block as well. That difference changes the distance from the crank pully and the cam pully. Depending how much it is milled depends on how far off it will be. When you tension the belt/chain(in our case), the top of the cam will be pulled in the direction of the tensioner.

 

Cam in block, push rod length would need to be changed!

 

That would apply if the 4.0 was an overhead camshaft engine but it's not. You can remove the cylinder head completely and it still doesn't affect the cam or cam timing. (See pic above)

 

Jesus christ what was I thinking.

 

Mira, best thing to do is get flat top pistons, mill block, and head. You will have to do lots of measuring while doing this, and make sure all valves clear all pistons. There is no easy, cheapest way to do it right. Also on this venture, as has been mentioned, you will need shorter push tubes more than likely, but you won't know that until you have everything baqck from the machine shop, and are doing all your measurements.