Engine progress

It’s been a while since I posted an update, but it’s not like anyone is following this anyway. 🙂 The engine is out, and on the engine stand. I ended up buying a new hoist from Harbor Freight on sale. Getting the engine pulled was relatively easy, especially once we figured out there are bolts holding the flex plate to the torque converter.

The cam and lifters are junk. Lifters are worn completely flat, so they’ve got to go — this was expected. Plus, a new cam should really wake the engine up anyway. No surprises there. Timing chain isn’t too badly worn from what I can see, but that doesn’t matter either since it’s getting replaced.

The heads are off and look about as you’d expect for a 93K-plus mile engine. In my humble opinion, the valves are probably not worth saving. There are grooves worn in the ends. I’m going to look for some GT40 or GT40P heads locally, since they breathe much better anyway. Slightly larger combustion chambers, but not enough to really hurt performance — especially with a new cam that can more than make up for it.

Pistons and bores look great. Cylinder bore wear is .003 or less, except for #5. That one is more like .006, with about .004 taper. Bore, or hone? I don’t know yet. Honing would save several hundred dollars on the cost of the rebuild. The machine shop wants around $300 for a bore & hone. Add to that a couple hundred for new pistons. If I can just hone, then I can re-ring with new moly rings and save close to $500. I’ll do some more measuring and get some expert advice before making a decision. I’m not building a race engine here, so there’s really no need to sink thousands into it.

All of the main and cam bearings look good, no scoring or signs of uneven (tapered) wear. The crank measures within about .001 of spec, so no work needed there assuming it’s not bent – and no reason to suspect it is.

All in all, it looks to be in better shape than I anticipated. It was definitely time for an overhaul, though. I’m sure the valves weren’t opening fully. Given the wear on the lifters and valve stems, I suspect the cam lobes are worn a bit as well. Cylinder walls had no crosshatch left, and there were signs of a little surface rust from sitting for a few years. I think it will benefit greatly from a slightly hotter street cam, better heads, a 4-barrel, and new rings on freshly honed cylinder walls.