1.6 rockers with this combo?
My engine builder says I have the clearance, and I have a set of 1.6 roller rockers laying around. So is there any downside in going with 1.6 ratio with my combination? Car is street/strip with emphasis towards strip. Also if you have any predictions on this combo love to hear them!
360 La, performer rpm intake mainifold, Eddy rpm heads ported w/ 1.6/2.02 SS valves, Comp hydraulic roller cam: Dur. @050: 236 / 242, Lobe sep. 110 deg, valve lift: 544/541, Eagle forged rotating assembly, internally balanced, light weight flywheel, 9:7:1 comp., 7qt kevko oilpan, Oiling mods
also does anybody have any input on staggering ratio's of rockers : 1.6 on intake and 1.5 on exhaust?
I’d say that is a really good combo you have there.
Adding rocker ratio does a few positive things.
A small narrowing of the LSA
Quicker lifting valves which is great for the intake charge. Quicker is always better on street cams.
Adds minor duration. The general consensus is 2*’s.
The added lift to .580/.577 is probably lifting the valve up into a higher and more favorable flow rate. IMO, I have often stated, while not needed, why not lift the valve as high as the heads flow well? It’s grabbing all the head has to offer in terms of flow which equals power.
Staggering rocker ratios can help. This is mainly a try it out and see and the dyno is a quick place to get that answer but less fun, though much more accurate over the drag strip. The power you’ll find will probably be small in terms of “The Seat of the Pants” feel, but might, just maybe, be a nice number on the report.
Overall, the cam is the one thing I’d change. But, everyone here will have their own cam to state is a great cam. The thing with camshafts is, ask 10 people there idea of a “BEST CAM” and you’ll get 10 different answers from idiots to pros.
One can argue that adding rocker ratio is introducing possible but easily (kind of, skill level dependent) avoidable problems with rocker geometry and wearing out valve springs. Ignore this and take the time to look if you need an upgraded spring and take the time to get the rockers where they need to be placed along with the right length pushrod. All of those problems go away when you do it right.
For help on rocker geometry, contact member B3, his name is Mike. He is a geometry freak and loves getting this stuff right.
(Not my word, his. He loves this stuff!)
He is also a really really cool guy.
I have used his services before and will again.
@B3RE
Run what ya got and enjoy. It’ll be good!
