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Warm wasn’t an option at the time. After letting it sit overnight I “spun” the engine by hand (ratchet) through a dozen rotations. Then performed a leak down check. All was good. 77/80 on a leak down or differential check, not a “compression check”. With an 80psi supply it held 77psi...

M122. I’m spinning it slower than a stock GT500 does at the same engine RPM. Car is running great now!

I suspected the following combination of stuff on those stock springs: 10 psi boost. Higher lift/ramp rate on the Hot Rod Cam. May have oversped it. I thought I asked Lito to set the rev limiter at the 6k, but a couple days before it broke I saw a lot of red to the left of the needle. I may...

Update: I let the car sit overnight with the followers installed. The lash adjusters must have bled down as I’m now getting excellent compression. Steve, I did my compression test immediately after installing the springs. Should have waited longer for the lash adjusters to bleed down to...

2005 GT 4.6L 3V Supercharged FRPP Hot Rod Cams (purely for the lope) Stock Heads otherwise I recently broke a valve spring on the #7 forward intake valve. Thankfully damage was limited to just the spring. After replacement of all three #7 springs and without the roller cam followers...