Purple Shaft lash question.

I assume you are running Aluminum heads? The OP is running cast iron W2's. Lash will tighten on an iron head engine.

ProSport said
That is incorrect. 28/32 is the 'Hot' lash setting. I set mine at 22/26 cold to get 28/32 hot.

My 451 big block ran in the high 9's in the 1/4 mile with the 590 cam and 28/32 lash.
It didn't beat parts up and it has ran 9's for years and years.
Click to expand...