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  1. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    So wsm also finally answered me and said their pistons are designed to go back into blocks that are honed so they are good to 3.380 so slightly larger then any oem replacement which was designed for a new engine. So either way look Iike it will be ok and if a little loose so be it. It’s also...
  2. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Cool thank you. I have taken quite a few measurements and even getting 3.375 closer to the bottom of the bore where skirt stability matters. But near top 3.378 and that’s with a near done finish.
  3. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Any chance you know factory specs for max clearance on the piston to wall? But yes your correct on the Teflon.
  4. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Yea well seems it’s useless like you said on the boat motors and not like automotive as I called them. I can’t even get a spec for piston to wall clearance. Or recommended hone grit for the rings they are using. I cleaned it up with a 220 grit hone and am at 3.379 at the largest cylinder. Would...
  5. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    If it’s like the automobile application that’s not true. I have tore down a 100k mile gm ltg 4 cylinder engine 275hp 2.0t and the skirts still have the Teflon on them if not damaged. I build auto engines and know the benefits and why they use it in performance applications. This is on a 6.2...
  6. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    All that milky oil in the top of the lower ? I did the water pump a couple months ago and it was spotless up there. It was getting hot while running low speed I thought it was the low timing but pulled the foot anyway and this time looking up in it I saw all that oil and water up from the...
  7. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Well curiosity got the best of me and with it not wanting to idle down I started tearing stuff apart. I found 2 pistons with scuffs /Burnt skirts blown out gaskets at the base plate and oil/water mix under the crank so maybe the crank seal was my vacuum leak? Can see 2 and 4 pistons are bad but...
  8. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Ok so gave that a shot and by the time i get it to idle low enough to go into gear ok it will now run hot and have no hole shot from timing being so low. Seems that now I got all 6 cylinders running strong it will not idle down enough and be able to sustain enough timing to run right. I pulled...
  9. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Ok back together and what a difference idle is very clean but stays around 1000 unless I back timing way down to like 10 atdc. This is with it idling on the ears I almost cannot make it stall out unless goes to point it’s running bad. Any timing around 4/6 atdc which has great idle it’s just too...
  10. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Oh and any other tips I’m all ears on this thing.
  11. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    He told me he took .015 but I’m getting 35/36cc I checked a few to be sure. So I guess he took a little more then he thinks. I don’t think they had been cut before as got 40cc on the first check. But it wasn’t perfect either and a rough ball park on it before I took them over. I guess cranking...
  12. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Got heads back today took .015 off then chamber was 40cc now 35cc. I read some got to 32cc so didn’t want to push it too much but still gain a little. Did the link and sync and was off pretty far. Idle timing was way retarded and max timing was only 20. I’ve read a lot of posts that 3 to 4...
  13. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Really not bad at all. One has a couple scratches I can feel other then that all look good no scuffs signs of being too hot. It had 125 psi on all cylinders hot so I’m not really concerned too much on the few scratches I see in that one hole. This thing went nose up big time trying to plane so...
  14. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Yea that’s what I was thinking. The one is original to the motor and it’s beat bad. The other side as had been replaced and looked good. Probably had a blow out on that side. The gasket is water logged and ate up some. I build v8 motors so will Check the deck also. Feel like it’s a gasket...
  15. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    So actually blown out on cylinder 1 and 3 even though 3 only showed the water on the plug. So even better I guess as 55 mph and 4500 rpm this thing will fly when it’s strong on all 6 cylinders. I might have the heads checked and take .005-.010 off them as run 93 anyway in this.
  16. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    So been on the water a few times and it’s been hit or miss. Since last time I have picked up the sierra plug wires for this motor which didn’t change anything as I had a auto wire that was zero resistance sort of a race wire for these new gm coil on plug cars that generate 65k. But I put the...
  17. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Cool deal so this is the hot motor? That under rated version.
  18. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Those are a solid core wire but I’m looking for a decent price on something oem. It’s running good on those but know not ideal from what I have seen you guys saying
  19. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    I’ll take care of those and solder. Something the previous owner did. I’m now the third owner.
  20. Lt1z350

    1989 xr4 150 that sat 3 years issues.

    Ah probably so that thing is hard as hell to push. Thanks for info.
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