I am putting brodix 180ik Heads on with a lunati roller cam and harland sharp roller rockers i want to know if with my 1.6 rockers or a roller cam will i need to change springs, or even to accept more lift. here are the specs Basic Operating RPM Range2,000-6,500Intake Duration at 050 inch Lift232Exhaust Duration at 050 inch Lift242Duration at 050 inch Lift232 int./242 exh.Advertised Intake Duration290Advertised Exhaust Duration300Advertised Duration290 int./300 exh.Intake Valve Lift with Factory Rocker Arm Ratio0.510 in.Exhaust Valve Lift with Factory Rocker Arm Ratio0.525 in.Valve Lift with Factory Rocker Arm Ratio0.510 int./0.525 exh.Lobe Separation (degrees)110
Basic Operating RPM Range2,000-6,500Intake Duration at 050 inch Lift232Exhaust Duration at 050 inch Lift242Duration at 050 inch Lift232 int./242 exh.Advertised Intake Duration290Advertised Exhaust Duration300Advertised Duration290 int./300 exh.Intake Valve Lift with Factory Rocker Arm Ratio0.510 in.Exhaust Valve Lift with Factory Rocker Arm Ratio0.525 in.Valve Lift with Factory Rocker Arm Ratio0.510 int./0.525 exh.Lobe Separation (degrees)110550" lift
*Chrome moly 7 degree retainers
*Hardened locks
*3/8 rocker arm studs
*5/16 Guide Plates
*Teflon valve Seals
*Straight Plug Design
180 cc runners 70cc chambers

 

what springs do you have on the heads now?

 

this is what im geussing i just bought them off of a guy all stock springs still. 1.250 Hydraulic Valve Spring - CC 981,
100 lb Closed, 300 lb Open,
1.850 Installed Height,
.525 Maximum Lift
(IK 180, IK 200)

 

The lift of that cam with 1.6 rockers will be .544/.560 which exceeds the .525 lift of those springs you mentioned. You might want to contact Lunati and ask them what springs they recommend for that cam. Same with Brodix, they will know what the max lift is on those heads.

http://www.summitracing.com/parts/BRO-1021005/

If these are the heads the max lift is .575 so you are safe. As long as you swap the springs.

 

yeah thats what i was wondering is what the lift would be with the 1.6 rockers. im about 90 percent sure they are the .525 lift because they are the 70cc heads but thanks i will have to call them and see what they recommend.

 

No problem, if you can find that cam on summit it will probably recommend you the correct springs.

 

lunatis web site will give you the correct valve springs the part # should be with the cam card.