383 tpi had been running nicely for a while. The lifters got noisy after sitting during the winter. When replacing them, i port matched and cleaned up the lower manifold. After getting it back together, it now pings over 3000 and 1/3 throttle. I replaced the knock sensor and esc. Checked continuity from knock sensor plug to esc and is good. I ordered another chip and made no difference. Base timing is at 6*. 10:1 compression and 92 octane. The old lifters had been stuck at full height. I was thinking a burned valve but theres no unusual running. I swapped to a step colder plug with no change. It does run warm, which it always has. It sounds mostly towards the passenger side.

 

Is there a possibility that the water passage from the front of the pass side head to the intake was partially blocked when the lifters were changed?

 

as a quick test , you could run some 100 octane racing fuel in it .if the ping goes away, you are on the right track. you might also use a can of seafoam to de carbon things a bit.

 

Im fairly sure the intake is clear. I will try the sea foam because the plugs did have some carbon on them. I want to try higher octane but i cant find any place nearby that sells it. I did verify the timing changed when revved but cant read the decal anymore to see where it is maxing out. Im saving up to switch to a holley avenger but i dont want to swap it and still have the same issue

 

Whats the timing in the chip??

 

A list of ethanol free stations in Pa. some up to 110 octane.
http://pure-gas.org/index.jsp?stateprov=PA

 

holley tuning tool= BFH !!

 

Ill ask the tuner what my max timing is at. Im going to try sea foaming it and see how it goes

 

The closest place in the gas listing that displays higher than 93 is 100 miles away

 

Try setting base to 0 deg and see if it goes away

 

Ill see if that helps. I idles much better with 12* base but i would never run it at that

 

i tried sea foaming the engine. needless to say, it is now being rebuilt this winter

 

Why?

 

ping got very bad and now has excessive blowby. i lost a half a quart of oil through the dipstick tube on a 20 mile drive. it also blows the pcv out of the valve cover if run hard and smokes out of the breather even with the pcv installed

 

time for a rebuild, my friend.

 

got it all apart. all ring lands were cracked and the crank had also cracked. ditched the tpi and went with a holley avenger

 

At least you discovered what the problem was. Good luck on the build.

 

Tune is everything, mail orders usually don't work