Guest zfan Posted August 5, 2000 Share Posted August 5, 2000 I JUST INSTALLED A SET OF EDELBROCK RPM HEADS ON MY Z AND THE INSTRUCTIONS CALLED FOR RUNNING THE Z AND AFTER COOLING THE ENGINE OVERNITE RETORKING THE HEADS. WELL THAT SOUNDS SIMPLE EXCEPT TO DO THAT YOU HAVE TO TAKE THE EXHAUST SYSTEM BACK OFF NOT TO MENTION THE ROLLER ROCKERS TO GET TO THE HEAD BOLTS WHICH MEANS ALSO RE-ADJUSTING THE VALVES!!!! SOUNDS LIKE FUN WHAT A PAIN IN THE BUTT... ANYWAY AFTER COOLING DOWN OVERNITE I CHECKED THE ACCESSABLE BOLTS AND ALL WERE TIGHT. HAS ANYONE EVER DONE THIS AND IS THIS NECESSARY? ONES I COULD GET TO WERE STILL TIGHT. Quote Link to comment Share on other sites More sharing options...
Drax240z Posted August 5, 2000 Share Posted August 5, 2000 I think you are supposed to loosen off the bolts, and then retorque them, not just try to tighten them again. Sounds like a major PITA. ------------------ Drax240z 1973 240z - L28TURBO transplant on the way! http://members.xoom.com/r_lewis/datsun.html Quote Link to comment Share on other sites More sharing options...
SpeedRacer Posted August 6, 2000 Share Posted August 6, 2000 I have Trickflow aluminum heads and the instructions just had you tighten the head bolts in three stages (32, 52 & then 70 ft/lbs). They did say you could re-torque after running but it was not required. Quote Link to comment Share on other sites More sharing options...
Mikelly Posted August 6, 2000 Share Posted August 6, 2000 Someone else on this site (Early in our beginnings...) had the same problem and wound up loosing a headgasket because of that. I'd strongly recommoned it. And Drax is correct. You must break the bolt loose, removing all torque, then retorque the bolt. It is a pain, but better do it once, then have to learn the hard way and then have to pull a head....or worse! Mike ------------------ "I will not be a spectator in the sport of life!" mjk Quote Link to comment Share on other sites More sharing options...
Modern Motorsports Ltd Posted August 6, 2000 Share Posted August 6, 2000 AIR, the necessity to retorque your heads is more a matter of which gasket you used than which heads your running. I haven't retorqued either buildup I've run, first went a couple years and most recent still going a few months along. (both with RPM heads)I used the GMPP head gaskets this time and Felpro perma torque last time (blue stripe). I'm just polling another list full of Lt1's etc to see what their experiences have been with retorquing. Quote Link to comment Share on other sites More sharing options...
Modern Motorsports Ltd Posted August 8, 2000 Share Posted August 8, 2000 feedback from a list of Lt1's etc was their OEM setup when serviced (as many of them have) does NOT require retorquing, as I've used same gaskets I'm not concerned with it either. Quote Link to comment Share on other sites More sharing options...
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