Will 1.85 rockers affect P2V Clearance?
Race Director
Joined: Aug 2006
Posts: 13,542
Likes: 1
From: Are you fat because you're lazy or lazy because you're fat? San Jose, CA
Cruise-In X Veteran
St. Jude Donor '09
I'm not sure about your specific question, but I've been told to stay with the 1.7 ratio from Tony Mamo, and he certainly knows what he's talking about.
And it's duration that affects the P2V clearance much more than lift does.
And it's duration that affects the P2V clearance much more than lift does.
Former Vendor
Joined: Apr 2007
Posts: 1,331
Likes: 4
From: Jacksonville Florida
Im curious, if yoru cammed why would you use these? If you need more lift i would reccomend a different cam, higher ratio rockers is a bandade IMO.
Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
Yes...
A higher rocker ratio will slightly reduce your P to V clearance.
The other negative is valve control which they will inevidably have an adverse effect on (valve motion is no longer accurate and smooth at higher RPM's due to the added intensity from the higher ratio).
You have to have dedicated cam profiles meant for the faster ratio's to really benefit from their installation.
There are better places to spend your money...you may end up with the same or even less power due mainly to valve control issues.
Good luck
Tony
PS...Duration has a much greater effect on power output than lift by the way. You are far better off getting a different cam but obviously the swap is not nearly as simple.
PSS....If you get 1.85 rockers and lose power the executive producer might cancel your Corvette show....LOL (badda bing!)
A higher rocker ratio will slightly reduce your P to V clearance.
The other negative is valve control which they will inevidably have an adverse effect on (valve motion is no longer accurate and smooth at higher RPM's due to the added intensity from the higher ratio).
You have to have dedicated cam profiles meant for the faster ratio's to really benefit from their installation.
There are better places to spend your money...you may end up with the same or even less power due mainly to valve control issues.
Good luck
Tony
PS...Duration has a much greater effect on power output than lift by the way. You are far better off getting a different cam but obviously the swap is not nearly as simple.
PSS....If you get 1.85 rockers and lose power the executive producer might cancel your Corvette show....LOL (badda bing!)
Last edited by Tony Mamo @ AFR; Aug 1, 2007 at 05:43 PM.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Not sure what you are trying to achieve or why you are looking at rockers, but have you considered a good 1.7 rocker? Someone on tech picked up 5 hp with the Yella Terra's in a back to back dyno and I think the Crane's have something to offer as well, but for more $$$. The Cranes are also fully adjustable if that is of interest to you. One thing I do like about the aftermarket rockers is, from my experience, you can achieve a much more narrow wipe pattern with them if you correctly adjust them and this should help with valve guide wear, especially when using stiffer aftermarket valve springs.
Instructor
Joined: Apr 2006
Posts: 161
Likes: 1
From: Cypress TX
If you are unsure, i'd always just check ptv clearance...don't take anyones word on here that it will work...give yourself peace of mind and check..
anything worth doing is worth doing right...
i checked mine and had to cut a measley .035 on the intake...
anything worth doing is worth doing right...
i checked mine and had to cut a measley .035 on the intake...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
