- Aug 27, 2014
- 42
- 1
- 6
Hey guys I have a 347 Stroker motor I hand built. I have probe racing internals. It has a holley 750 Carburetor. 7qt Moroso Oil pan. Cast Iron GT heads ported and milled. approx 11.0 Compression.
The engine fired up and ran from day 1. My only dilemma is valve-train noise or what seems to be valve train noise. I have only started and driven the car around the block for testing.
After a few starts and testing the motor, it started making this tapping//knocking/tractor sound from around the heads/valve-train.
background on the valve train. Comp Cams Xtreme energy cam with .575 lift on exhaust .565 on intake. i have comp cams hydraulic lifters, measured push rods going into 1.6 full roller aluminum rockers double spring comp cams and i forgot what valves. What I do not remember doing was tightening the rockers down in any specific order however I was told that didn't matter since they are pedestal mount rockers(not sure if I believe that i don't have to do them in the turn the motor over by hand check style and tighten flow).
Last night i took off the valve cover everything seems to still be as snug as I remember. push rods have no play are solid on the compression phase and slights spinnable during the uncompressed phases of the valve (possible valve float issue?)
Now the sounds always seems to be traveling.
I thought maybe it was lubrication issues but there is the Melling HV oil pump and the 7 quarts double sump keeps oil in every place it needs to be.
could this just be a pinging issue for timing? or is it mechanical in the valve train?
to make it clearer in what it sounds like, picture an old Volvo diesel truck =P
Thanks in advance!
The engine fired up and ran from day 1. My only dilemma is valve-train noise or what seems to be valve train noise. I have only started and driven the car around the block for testing.
After a few starts and testing the motor, it started making this tapping//knocking/tractor sound from around the heads/valve-train.
background on the valve train. Comp Cams Xtreme energy cam with .575 lift on exhaust .565 on intake. i have comp cams hydraulic lifters, measured push rods going into 1.6 full roller aluminum rockers double spring comp cams and i forgot what valves. What I do not remember doing was tightening the rockers down in any specific order however I was told that didn't matter since they are pedestal mount rockers(not sure if I believe that i don't have to do them in the turn the motor over by hand check style and tighten flow).
Last night i took off the valve cover everything seems to still be as snug as I remember. push rods have no play are solid on the compression phase and slights spinnable during the uncompressed phases of the valve (possible valve float issue?)
Now the sounds always seems to be traveling.
I thought maybe it was lubrication issues but there is the Melling HV oil pump and the 7 quarts double sump keeps oil in every place it needs to be.
could this just be a pinging issue for timing? or is it mechanical in the valve train?
to make it clearer in what it sounds like, picture an old Volvo diesel truck =P
Thanks in advance!