I have a brand new set of Crane Energizer Roller rockers 1.5. I thinking about buy a set of the Comp Cams Pro Magnum Roller Rocker Arms and get the 1.6. I have already measured my pushrod length and it's 7.800, How much will the 1.6 roller rocker affect my pushrod geometery?
Second is it worth to upgrade to the magnum on a street hp engine.
Solid Cam
247/251@.050
Gross Valve Lift Intake 0.518 w/1.5:1 Rockers
Gross Valve Lift Intake 0.552 w/1.6:1 Rockers
Gross Valve Lift Exhaust 0.530 w/1.5:1 Rockers
Gross Valve Lift Exhaust 0.565 w/1.6:1 Rockers

Lash Recommendation is .026

Net Valve Lift Intake 0.495 w/1.5:1 Rockers
Net Valve Lift Intake 0.526 w/1.6:1 Rockers
Net Valve Lift Exhaust 0.504 w/1.5:1 Rockers
Net Valve Lift Exhaust 0.539 w/1.6:1 Rockers

The AFR 195 flow numbers at .500-.550 @260-262 I think the 1.6 ratio will be the best to max the efficiency of the heads.
What are your opinions?

 

you can't really guess or estimate push rod length, you need to dummy it up and see what you need

 

I dummy it up for my current Crane 1.5 energizers came out to 7.800., but if I get the 1.6, I guess I will still have to dummy up again.
I just wanted to buy the pushrod and roller rockers from Summit on the same bill. save a little on shipping....

 

your pushrod geometry won't change

 

Yeah, I don't really understand the question, The 1.6 will give slightly higher lift, and a little more effective duration. The only thing you need to worry about is if the head or block has been cut the pushrods can interfere with the guide slots in the head.
Run, don't walk to the local shopping center and pick up a copy of july 2004 Chevy Hiperformance magazine (red nova on cover) Go to page 136 and check out the question in the center column about rockers. I can't find that particular editorial on their websight. It will give you some ball-park specs. I hope that helps.