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1G Valves are shot, need advice

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trapdad

Proven Member
41
0
Mar 29, 2016
Lapeer, Michigan
So bought my car with a rebuilt head around 2000 miles ago, and for probably the last 1500 miles I've been experiencing pretty much no power exactly like a boost leak. It's been running stupid rich ever since I bought it. Only mods are walbro 255, aftermarket fpr, evo iii 16g, and egr delete. I finally get around to compression testing it and its consistently ~100psi +-2. Checked
the timing to make sure it didn't skip, and it didn't. So I start pulling everything apart. All the intercooler piping seems solid and I couldn't find any leaks with a simple hand over one side, mouth on the other test. N
ot really a valid test but I trust all the piping. I end up pulling the head for a visual inspection of everything because I'm too cheap for a leak down tester. I rotated one of the cam gears while it was off once or twice I'm not sure if that screwed anything up but it seems as if there's a huge gap when my valves should be seated. My question is what's the next step? Does an automotive machine shop fix this or should i just find a different head for sale? Mine is in very good condition other than this.
 

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Are you sure your on the base circle of the cam for those pictures? Only time ive ever seen valves stick up that far is when they are bent from contact and there doesnt seem to be any evidence of that here.
 
Any other supporting parts or just new valves?
Valve guides especially if you plan on running E85 or Meth injection. Keep in mind that with the cams still in, Some valves are always going to be open. You can loan a compression or even leak down tester from autozone for a deposit you get back in full when you bring the tool back.
 
You need to do some research on lash adjusters if you aren't getting this. The only way to release the pressure is applying a lot of pressure (only real method for first gen lifters) or probing the release valve through the pin hole in the top of the lifter (best method that works with 2nd and 3rd gen lifters) and squeezing them. Just because you pull them out of the head doesn't mean they all release the oil and pressure they were holding wherever they were at when the engine stopped. The valve spring pushes your valve back up after the cam and rocker shoves it down. Its actually the cam if anything that applies the pressure to the rocker that decompresses the lifter. Our lifters are self adjusting. Once again, read up on the subject rather than assuming things.
Link for cleaning:
http://vfaq.com/mods/lifters.html
Heres a video:
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And another:
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