1.6 roller rockers ?
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1.6 roller rockers ?
just about got my engine buttoned up from head and cam change. have 1.5 roller rockers that were on the engine . my buddy has a new set of 1.6 roller rockers I can have for $50. I have plenty of valve to piston clearance . dished pistons , 56 cc trick flow heads , and this cam. http://www.summitracing.com/parts/hrs-cl110041-12
would 1.6 rockers be a good idea ??
would 1.6 rockers be a good idea ??
Le Mans Master
Joined: Apr 2011
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From: Hermosa
Using the 1.6 would put your lift on the exhaust up to .520 from .488. If you got the piston clearance and are far enough from coil bind (.060) at that height and have no valve guide interference problems, then I would say yes, its worth a try.
It will make the cam behave like it a has little more duration. You may also need different length pushrods. Looks like pretty decent duration already on that cam.
It will make the cam behave like it a has little more duration. You may also need different length pushrods. Looks like pretty decent duration already on that cam.
Last edited by REELAV8R; Jan 7, 2015 at 04:24 PM.
Le Mans Master
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the factory heads need some clearance work. the exhaust port on factory heads doesn't flow fantastically well and a 1.6 rocker will help on the exhaust. if the other items mentioned check out i would say go for it. if i remember correctly it affects lift about 30 thou, and duration marginally.
Last edited by 7t9l82; Jan 7, 2015 at 10:10 PM.
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What brand of rockers are the 1.5 and 1.6's? Some of the cheap stuff I'd never use.
JIM
JIM
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Le Mans Master
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Your trick flow heads you can just about bet have push rod clearance built in to them to use a 1.6 rocker. The aftermarket has known for a long time now that 1.6 rocker use is a very common thing done to the SBC. It won't be a round hole like the factory used you can see the difference just by looking at it. Extra lift you need it there is no doubt about it in your case, your below .500 lift with your cam. Even the poor air flowing factory heads liked a little over .500 lift. The 1.6 rockers extra added lift will help you even more so with the better breathing aftermarket heads you have. Push rods plenty good enough for what your doing do not cost much. You don't need the latest greatest .080 thick expensive push rod's for a flat tappet hydraulic cam. Very good point on what brand of rockers they are.
Last edited by Little Mouse; Jan 8, 2015 at 12:48 PM.
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Joined: Dec 2014
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Your trick flow heads you can just about bet have push rod clearance built in to them to use a 1.6 rocker. The aftermarket has known for a long time now that 1.6 rocker use is a very common thing done to the SBC. It won't be a round hole like the factory used you can see the difference just by looking at it. Extra lift you need it there is no doubt about it in your case, your below .500 lift with your cam. Even the poor air flowing factory heads liked a little over .500 lift. The 1.6 rockers extra added lift will help you even more so with the better breathing aftermarket heads you have. Push rods plenty good enough for what your doing do not cost much. You don't need the latest greatest .080 thick expensive push rod's for a flat tappet hydraulic cam. Very good point on what brand of rockers they are.
Le Mans Master
Joined: Apr 2006
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guy is in the hospital with pneumonia right now so not sure what brand. I think the 1.5's I have might be cheapies. only I small circle with 1.5 in it. no other markings anywhere, so if I decide to use them how do I know what pushrod length to use? I could always swap the rockers and rods later when the weather warms up. getting antsy to get it running. new side headers coming tomorrow .
buy a push rod length checker. You can magic marker tip of valve, get the mark the roller leaves centered and narrow on the tip of the valve will work. Then just look up the length push rods you need.
Last edited by Little Mouse; Jan 8, 2015 at 07:43 PM.
Le Mans Master
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From: Hermosa
Sure you can do it later but you can benefit from a 1.6 its not a waste of your time to do it whenever you decide to.
buy a push rod length checker. You can magic marker tip of valve, get the mark the roller leaves centered and narrow on the tip of the valve will work. Then just look up the length push rods you need.
buy a push rod length checker. You can magic marker tip of valve, get the mark the roller leaves centered and narrow on the tip of the valve will work. Then just look up the length push rods you need.
