TM818 Posted October 21, 2011 Share Posted October 21, 2011 Hello, First time posting here...long time reader. After trying clean my lifters and trying to find hydraulic lifter replacements for a 1983 tuubo P90a head i swapped them for adjustables. My problem now is adjusting them, do i follow factory specs for a P90 head and does anyone know a different spec i should be using. I did adjust them to the specs for a P90 head and they seem a bit noisey....any help would be appriciated. TM Quote Link to comment Share on other sites More sharing options...
letitsnow Posted October 21, 2011 Share Posted October 21, 2011 Did you change the cam when you changed the lifters? I just did the same swap with a '77 N/A cam and adjusted to .008/.010 cold(per FSM) and they were very quiet. Quote Link to comment Share on other sites More sharing options...
TM818 Posted October 21, 2011 Author Share Posted October 21, 2011 Did you change the cam when you changed the lifters? I just did the same swap with a '77 N/A cam and adjusted to .008/.010 cold(per FSM) and they were very quiet. No, I did not change the cam..i never read anywhere that it would need to be changed...should it have been? Quote Link to comment Share on other sites More sharing options...
letitsnow Posted October 21, 2011 Share Posted October 21, 2011 Yes, you need to use a cam that had solid lifters to begin with. If you want to stay with a factory cam, go for one of the pre-'81 N/A cams, marked A on the back. I noticed a nice bump in mid-upper end power with little to no change down low. Quote Link to comment Share on other sites More sharing options...
Tony D Posted October 22, 2011 Share Posted October 22, 2011 Noisy valves are happy valves. Quiet valves are hot, ready to burn valves! Quote Link to comment Share on other sites More sharing options...
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