TimberwolfFXDL

I am thinking of putting my vortec heads that are setup for .550 lift on my L48 motor, along with a performer rpm intake, holley 670 and a new cam. I didn't go to screw-in studs when I had the heads reworked, so it's still the stock studs.

What I am wondering is what the max lift is with something like these rockers? I read somewhere that they were long slot, but haven't been able to confirm that.

http://paceperformance.com/i-6497436...take-offs.html

MelWff

This is the description in the GM Performance Catalogue, no mention about long slot. Better off with a set from Competition Cams, exact 1.52 ratio as opposed to "nominal".

Rocker Arms
A. 12495490
Rocker Arm Kit, Steel, 1.5 Ratio (set of 16)
• Self-aligning, high-quality rockers have a nominal 1.5:1 ratio
• Includes 16 stamped steel rockers with pivot ***** and nuts
• Use P/N 10089648 for single service part; for 3/8" studs
NOTE: Not recommended for mechanical lifter camshafts.

TimberwolfFXDL

yeah I did an image search and it's fairly clear from the pictures it's a standard slot.

And I agree on the Comp Cams rockers. I am thinking I may use the roller tip SA 1.52 rockers for this.

MotorHead

If the heads are still off the motor I would get screw in studs with that high lift for insurance, nothing more of a nuisance than studs pulling out of the heads once it's together