I have a 91 5.0 Block and am using a TFS Stage 1 Cam. When I used my degree wheel my ICL was 112.
The cam specs do not show ICL only Lobe Sep which is also 112.
If I am understanding this right would that mean that the cam has no advance in it when installed dot to dot ?
The reason for the question :
The car lacked bottom end power and had a lifter knocking noise. Off came the intake to remove the Ford Rollers and install Cranes. Then I had one that was not sending oil to the rocker. I removed it and found that they did not drill the hole in the inner piston of the lifter. After sending those back and getting a set of Lunati rollers I was getting oil out of all the lifters but still had a noise, so, I pulled the engine to inspect and find the cause of the lifter noise. It turned out that the new AFR 185 Heads had weak valve springs.
The spring pressures were verified with a Longacre and Remik spring tester. One spring had 105 seat and 280 open. Specs for those springs are 140 seat and 356 open at .600. You could even see where the valve had been bouncing. I did not bother checking them all. This motor only has 150 miles or less and has never seen 3000 rpm yet. I called AFR and was offered a new set of springs. That did not sit right with me so I called Summit where I bought the heads and they next day delivered a new set This time I dissembled them and valve spring installed height on 13 of them was 1.825 out of the box and the spring calls for 1.810. I added a .015 shim to those and got that right. Its a bummer that I had to do all that work when it should have already been done during the factory build. I checked all the spring pressures and they were spot on. AFR does not want to send you replacement heads if you have an issue with springs. They will send you a new set of springs. WTH. I spent good money for a set of bolt on heads. I am not responsible for changing out defective parts. The only reason I dissembled them this time was to make sure of what I had before I bolted them on.
Next time I will buy good bare castings and build them myself.
The cam specs do not show ICL only Lobe Sep which is also 112.
If I am understanding this right would that mean that the cam has no advance in it when installed dot to dot ?
The reason for the question :
The car lacked bottom end power and had a lifter knocking noise. Off came the intake to remove the Ford Rollers and install Cranes. Then I had one that was not sending oil to the rocker. I removed it and found that they did not drill the hole in the inner piston of the lifter. After sending those back and getting a set of Lunati rollers I was getting oil out of all the lifters but still had a noise, so, I pulled the engine to inspect and find the cause of the lifter noise. It turned out that the new AFR 185 Heads had weak valve springs.
The spring pressures were verified with a Longacre and Remik spring tester. One spring had 105 seat and 280 open. Specs for those springs are 140 seat and 356 open at .600. You could even see where the valve had been bouncing. I did not bother checking them all. This motor only has 150 miles or less and has never seen 3000 rpm yet. I called AFR and was offered a new set of springs. That did not sit right with me so I called Summit where I bought the heads and they next day delivered a new set This time I dissembled them and valve spring installed height on 13 of them was 1.825 out of the box and the spring calls for 1.810. I added a .015 shim to those and got that right. Its a bummer that I had to do all that work when it should have already been done during the factory build. I checked all the spring pressures and they were spot on. AFR does not want to send you replacement heads if you have an issue with springs. They will send you a new set of springs. WTH. I spent good money for a set of bolt on heads. I am not responsible for changing out defective parts. The only reason I dissembled them this time was to make sure of what I had before I bolted them on.
Next time I will buy good bare castings and build them myself.
