I was using an LSM on rocker tool to check valve spring pressure which in my mind equalled valve spring condition along with checking lash and tracking top end performance for consistency. Since it seems that a broken valve spring may well have been my issue I want to be sure I'm doing the checking right.
I used my spring tool to check installed pressure after the motor came home form the dyno as a baseline. It was right at the 230# number the the heads had been setup with during the build. I checked the springs before most events when I ran the valves and saw less than 5% change which I'd understood was acceptable.
I've been running the same Isky Tool Room springs on these version 3 TFS A460 heads as I ran on the previous version one set of the same head. The change was to go from a 2.35" stainless intake to a 2.40" ti intake on the new heads plus a more aggressive lobe cam and higher shift point, 7500 vs 7200.
I expected lower spring life which is why I was checking frequently. I did not check between the two True Street events, Fun Ford and NMCA which is where the valve broke and I found the outer spring broken in tow places.
I noticed in Jake's post that he checked lash and pressure every day at DW. I didn't, I checked lash before we left, day 1 and day 3. I didn't check pressure after the pre-departure check. They checked fine before the Fun Ford event four weeks ago.
What should I be doing different? How do you guys check yours?
I used my spring tool to check installed pressure after the motor came home form the dyno as a baseline. It was right at the 230# number the the heads had been setup with during the build. I checked the springs before most events when I ran the valves and saw less than 5% change which I'd understood was acceptable.
I've been running the same Isky Tool Room springs on these version 3 TFS A460 heads as I ran on the previous version one set of the same head. The change was to go from a 2.35" stainless intake to a 2.40" ti intake on the new heads plus a more aggressive lobe cam and higher shift point, 7500 vs 7200.
I expected lower spring life which is why I was checking frequently. I did not check between the two True Street events, Fun Ford and NMCA which is where the valve broke and I found the outer spring broken in tow places.
I noticed in Jake's post that he checked lash and pressure every day at DW. I didn't, I checked lash before we left, day 1 and day 3. I didn't check pressure after the pre-departure check. They checked fine before the Fun Ford event four weeks ago.
What should I be doing different? How do you guys check yours?
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