Achieving desired SS valve lift.....

Kevin Panzino · 07-12-2013, 07:54 PM

And why exactly is this all of a sudden in fashion??

With lower lobe lift, and higher rocker ratio's, a larger portion of the valvetrain mass undergoes lower acceleration. And that is nothing but good.

If you can move the lifter, the pushrod and half of the rocker mass less distance and less quickly for a given valve lift and rate, then how can that be bad??

high rocker ratios allow more 'area under the curve' of the valve for a given duration and given cam ramp..

It blows my mind, how all of a sudden high ratio rockers are now out of fashion, and the old ratios are back in....

Perhaps Im missing something, but there is nothing at all technically negative about high ratio rockers other than increased load on the lifter, cam bearings, pushrod, and thus potential pushrod flex,.. And roller cam bearings, large diameter roller lifters, and pushrod quality and design have taken care of that problem....

Tell, you what, its all fine with me, because all I have right now is a set of 1.7's, on the intakes and 1.6's on the exhaust, and I'd like to get some 1.8's, and 1.7's, so this means I should be able to trade someone and even make a few bucks, eh ??

So there you go, all you guys with the 1.8's Intakes and 1.7 exahusts on a SBC jesel shaft, thats OLD SCHOOL.. You are sooooooo lame.....

I have what you need right here... some 1.7's and 1.6's.. PM me asap, so you can trade with me, and you can go faster....

07-12-2013, 07:54 PM	#5
Kevin Panzino Senior Member Join Date: Oct 2002 Location: Pittsburgh Posts: 576 Likes: 298 Liked 748 Times in 137 Posts	Re: Achieving desired SS valve lift..... And why exactly is this all of a sudden in fashion?? With lower lobe lift, and higher rocker ratio's, a larger portion of the valvetrain mass undergoes lower acceleration. And that is nothing but good. If you can move the lifter, the pushrod and half of the rocker mass less distance and less quickly for a given valve lift and rate, then how can that be bad?? high rocker ratios allow more 'area under the curve' of the valve for a given duration and given cam ramp.. It blows my mind, how all of a sudden high ratio rockers are now out of fashion, and the old ratios are back in.... Perhaps Im missing something, but there is nothing at all technically negative about high ratio rockers other than increased load on the lifter, cam bearings, pushrod, and thus potential pushrod flex,.. And roller cam bearings, large diameter roller lifters, and pushrod quality and design have taken care of that problem.... Tell, you what, its all fine with me, because all I have right now is a set of 1.7's, on the intakes and 1.6's on the exhaust, and I'd like to get some 1.8's, and 1.7's, so this means I should be able to trade someone and even make a few bucks, eh ?? So there you go, all you guys with the 1.8's Intakes and 1.7 exahusts on a SBC jesel shaft, thats OLD SCHOOL.. You are sooooooo lame..... I have what you need right here... some 1.7's and 1.6's.. PM me asap, so you can trade with me, and you can go faster....