I have recently built a 292 for my 53 chevy p/u, lumps/ported polished/70cc head/I used Lp pistons,262 crower cam, mallory distributor, backed by a saginaw 4 speed& hayes clutch, all is balanced and harland sharp roller rockers 9:5:1 true comp ratio,, motor runs awsome tons of power but I have a valve tap sound that you can hear in cab, we have adjusted the rockers cold,hot and running, but I still have this sound, I never used roller rockers before,, are they noisier than the stamped rockers?? Im just looking for some advice,, please help..any info please help..
scpousn,
Have you made any head way with this?
I missed the Kempton show.
I'm in Douglassville, PA.
Wish I could say I could ride up there and listen and tell you what it was but funny noise diagnosis is not my strong suite.
I was wondering if it could be a small exhaust leak?
Sometimes the after market intake and exhaust manifolds or headers are a tight fit at flanges.
So when the intake and exhausts get torqued to head there's less than zero clearance and one or both may want to flex back away from head.
This leaves a small clearance, and a leak.
For me, on my 292 it was the headers and Offy intake with leak on bottom side of center runner leaving me wonder why car would start just fine until the couple squirts from accel pump were used up.
Of course the cure is to grind a bit off the flange of the offender where it butts together with other manifold.
Hope this helps.
Pete (MM2USN)
