Hi, I keep posting topics here, but this one is a big mystery to me. I have a 100,000 mile block and I just did a mild head build with new cam, port match, etc... Well 2 weeks ago I had my car parked at work for a long shift and when I finished I drove off home, as I get 1 mile from home the temperature gets past 7/8 on the stock Datsun water temp gauge. As I get home I saw that there was not water in radiator. I filled it back up, checked again back in the morning before the drive to school. I lost water and car goes back to 7/8 temperature on gauge before heading home. I further inspected my car and saw that someone had slashed my lower radiator hose with a razor. I fixed the lower radiator hose, but now my car runs like crap. It idles at 550-600 and sometimes back to 850(regular idle), huge gas mileage loss and big power loss. I checked the compression and I get (1)110 (2)105 (3)107 (4)105 (5)110 (6) 105.
Wet compression test:
1 (140) 2 (170) 3(180) 4 (210) 5(180) 6(170)
I was really disappointed, but the only positive outcome out of this is that the compression holds. I checked to see if my timing chain jumped a notch but it didn’t. At TDC I’m still aligned with cam tower and cam at 2 on gear. My compression numbers are not a typo. The car runs, but it’s very underpowered. I did a rebuild on head 300 miles ago along other part upgrades. I need your help to see what the problem could be. The car does not smoke. I don’t have the compression numbers before rebuild, but was something I was going to do, but unfortunately this had to happen. Anything I can check to pin point problem? The car ran great after rebuild, except it needed timing to be synced.