Bigger Pushrods & Guideplates Legal in Stock now

Alan Roehrich · 05-26-2008, 01:27 AM

The 8.1 doesn't really have 9/16" studs. It has a 3/8" stud on the bottom and a shouldered nut that goes through the rocker to create what GM called a "net lash" system, which in plain terms means "non adjustable".

The limit to how "square" a flat tappet cam can be is lifter diameter. A Ford with an 0.875" lifter, a Chrysler with a 0.904" lifter, or an Olds with a 0.921" lifter can generate more tappet velocity (what makes a cam lobe "square") than any Chevy with an 0.842" lifter, regardless of spring pressure. It does not matter how much spring, or how good a rocker you put on it, the lifter diameter is the limit.

05-26-2008, 01:27 AM	#18
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,125 Likes: 1,582 Liked 1,880 Times in 422 Posts	Re: Bigger Pushrods & Guideplates Legal in Stock now The 8.1 doesn't really have 9/16" studs. It has a 3/8" stud on the bottom and a shouldered nut that goes through the rocker to create what GM called a "net lash" system, which in plain terms means "non adjustable". The limit to how "square" a flat tappet cam can be is lifter diameter. A Ford with an 0.875" lifter, a Chrysler with a 0.904" lifter, or an Olds with a 0.921" lifter can generate more tappet velocity (what makes a cam lobe "square") than any Chevy with an 0.842" lifter, regardless of spring pressure. It does not matter how much spring, or how good a rocker you put on it, the lifter diameter is the limit. __________________ Alan Roehrich 212A G/S