1.85 Rocker arms
Safety Car
Joined: May 2003
Posts: 3,814
Likes: 105
From: Dearborn Heights Michigan
Re: 1.85 Rocker arms (tater)
I have Jesel 1:8's that increased the lift .060 over stock, so 1:85 may be .075 or greater. However they are in conjunction with a cam so can't comment on perf of those only. Note we had to grind clearance in the valve covers to clear the 1:8's. Jesel's were $700.
Fred K.
Fred K.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Re: 1.85 Rocker arms (tater)
Has anyone installed a set? Is the perf. increase worth the expense? Seems like a nice way around a cam swap for a modest lift change.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Re: 1.85 Rocker arms (SpinMonster)
If you do go this route.....don't use the SLP ones...comp cams and yella terra have full roller rockers in these ratios so you can reduce friction and get some better protection from the dredded rooler-pin-in-the-motor issue.
Team Owner
Joined: Mar 1999
Posts: 28,753
Likes: 9
From: San Jose/Bear Valley CA
CA Events Coordinator
Re: 1.85 Rocker arms (tater)
You will need a new set of valve springs if you go this route... (unless you already have a Z06) IMO, a cam would be much better.
VR :cheers:
VR :cheers:
Drifting
Joined: Aug 2001
Posts: 1,260
Likes: 6
From: Thousand Oaks California
Re: 1.85 Rocker arms (SpinMonster)
The only justification for higher ratio roller rockers is if one fits all of the following categories:
1.) You have a belt-driven supercharger on an otherwise completely stock engine and it makes peak power at 6000 rpm or higher but the fuel cut is at 6200 rpm (for LS1s). But you need to shift at 5%-15% above your power peak rpm to fully translate the dyno numbers to track numbers and hence...
2.) You decide to change valvesprings and pushrods to raise the rev ceiling so you can shift at appropriate rpms
If you satisfy both criteria, then for the same labor as changing valvesprings, you could and might as well change the rockers to a higher ratio. You will likely get 10 to 18 extra flywheel hp plus you'll keep stock drivability.
[Modified by STAGED, 8:01 PM 9/1/2003]
1.) You have a belt-driven supercharger on an otherwise completely stock engine and it makes peak power at 6000 rpm or higher but the fuel cut is at 6200 rpm (for LS1s). But you need to shift at 5%-15% above your power peak rpm to fully translate the dyno numbers to track numbers and hence...
2.) You decide to change valvesprings and pushrods to raise the rev ceiling so you can shift at appropriate rpms
If you satisfy both criteria, then for the same labor as changing valvesprings, you could and might as well change the rockers to a higher ratio. You will likely get 10 to 18 extra flywheel hp plus you'll keep stock drivability.
[Modified by STAGED, 8:01 PM 9/1/2003]
Safety Car
Joined: Aug 2000
Posts: 4,154
Likes: 1
From: Murphy TX
Cruise-In II Veteran
Re: 1.85 Rocker arms (SpinMonster)
If you do go this route.....don't use the SLP ones...comp cams and yella terra have full roller rockers in these ratios so you can reduce friction and get some better protection from the dredded rooler-pin-in-the-motor issue.
