Trick Flow 190 Heads, hydraulic roller cam, and pushrod angle Question.

I assume the Poly does not have the 59 degree angle?

I think it's pretty clear that the 59 degree angle works well in 'street' engine, or more accurately, a non-high RPM engine. I think once you get over 6000RPM or so, you start seeing issues.

Of course, there are a few factors as play....in order to get over 6000RPM, you're most likely using a pretty stout cam, which has more lift, which further makes valvetrain life hard.

IIRC, the poly is a 59 degree LBA.

You can fairly easily run 7500-7800 RPM and be reliable IF you have the geometry correct, aren’t using crapola parts and keep up on spring loads. You’ll need AT LEAST a 3/8-7/16 single taper pushrod and the lightest valves you can afford, which isn’t usually an 11/32 stem.

To get more RPM than that is tough.