I have rebuilt Rover V8s, but always started with known good engines that did not overheat or make noise. However, I have good pull-outs from a P38 and a couple 04 D2s and would like to build a top hat lined engine. I would appreciate knowledgeable guidance on the following questions:
- Since top hat liners are supposed to be to Rover V8s what studding is to Powerstroke 6.0s, does it matter whether I start with a D2 or P38 block? I may opt to use the P38 block since they benefited from quality control methods, but if these liners are so great maybe it doesn't matter.
- Can the o-ringed (newer version) top hat liners be installed by any good machine shop? If not, is it worth shipping the shortblock to a machine shop familiar with Rovers (in the southeast, hopefully)? I would hate to ruin a known-good 4.6 that could just be rebuilt without new liners and run 200K if not overheated.
- Where is the best place to order the top hat liners and accompanying pistons (if needed)?
- Can you run 4.0 pistons on a 4.6 rotating assembly? I have seen some mention of this in the Australian Rover forums, and it appears to bump compression significantly. Will it still run on 93 octane without pinging in hot temps?
- I have always used stock camshafts, but have a 04 D2 with an aftermarket cam (bought that way, previous owner forgot brand) and it pulls noticeably better around 2250 and up. Are there any good aftermarket cams that do not sacrifice low end torque or require tuning?