273 adjustable rockers

[straight pipe]

what are the limits of the adjustable 273 rockers? like how many revvs can they handle before they explode?

[345Dart]

its not the revs, but the spring pressure you have to be cognizant of - anything over 300# open would be risky.

[perfmachst]

hello, explode?? we run them on stock eliminator 340, 360, turn them 7300 rpm in the traps. spring pressure is in the 135# seat and 350 open. used them in a 273 stocker years ago, turned it 7500 lots. guess lucky, never exploded any. just food for thought. with a roller cam and a ton of valve spring pressure, then might have problems?

[straight pipe]

that's exactly what i was hoping to hear .thanks for the feedback

[The Dartman]

When my wife drove my car for the first time she thought my 727 was a four speed... she shifted into nuetral at about 80 MPH with the motor wrapping 6200 and it hit 8000 before she dropped it back in to drive. I have this all on tape since I was riding with her in the car down the dragstrip, and I briefly lowered the camera and pointed it directly at my tach when it happened. Ouch!

Point being is that this is a set of 273 rockers. After this happened, I did not hear any ticks or valvetrain noise at all, and the car did not drop off in ET at all either.

I would highly recommend replacing the stock adjusters with new MP adjusters and locks. The oriignal 273 rockers have a very poor mechanism for not backing out. So poor that it is non existant... a common practice with these is to score the threads with a file to help it hold the adjustment. Common, but not the best idea....

Dartman

[Robertson_Tech]

Originally Posted by The Dartman

I would highly recommend replacing the stock adjusters with new MP adjusters and locks.

Dartman

never had a failure either, but this upgrade is agood one, have not checked are the MP adjusters and locks still a good part no?

[straight pipe]

this is great news ..thanks guys . i was really concerned about the rockers not being strong enough for what i want to do, but now i have NO worries!
thanks dave

[FastEddie]

I run them in a dirt tracker and run the s&*t out of them and no probs.

[pishta]

273 rockers were forged pieces, the 340 TA pieces were cast! The adjusters were friction (interference) locked,and the book says if they dont hold 15 ft/lb (or some torque figure) while adjusting, you need to replace the rocker.

[DAHEMIKOTA]

Originally Posted by Wild1_Robertson

never had a failure either, but this upgrade is agood one, have not checked are the MP adjusters and locks still a good part no?

I use the Crane # 99802-16 . You just have to make sure the surface that the lock nut contacts is flat and true. I have many runs on them with 7000+ shifts. I also groove the shafts for oiling. The stock shafts for adjustable rockers should have the grooves. Dan

[perfmachst]

hello, mopar and crane adjusters have had problems. they are either soft or to hard. smith bros. pusrods sells the best adjusters and nuts.they are a 12 point nut, lot easier to get a socket on them. just food for thought.