Slant Six Forum :: Roller Rockers/lifters

... I was looking at some of the discussions, and cant seem to find any positive on the subject...

... I have heard that they (the factory rocker arms) are all over the place as far as ratio goes.

I did back to back to back testing on my junk between stock rockers and 1.6 RAS rollers at the track. There was no difference in either ET or speed.

Rollers are good if you have a lot of valvespring pressure and are breaking stock arms.

Quote:

... I have heard that they (the factory rocker arms) are all over the place as far as ratio goes.

I have measured a lot of factory rocker arms and they range from 1.48 to 1.52.
Most are in the 1.49 to 1.50 zone.

Doing the math... a 1.49 ratio drops the lift at the valve by .004 so it is not much difference.
DD

I had planned on going with the stock rockers, but was a little concerned about how they might affect valve lift.

If you really are anally retentive or just too detail oriented,

Looks like I started something.

Author:	twister6 [ Sun Jul 24, 2016 7:05 pm ]
Post subject:	Roller Rockers/lifters
Is there a decent set of roller rockers for the slant that works. I was looking at some of the discussions, and cant seem to find any positive on the subject. I found a set online at pentastar parts for only 1350.00..LOL..thats a little pricey..What about roller lifters?? is there any availiable? Need some feedback if you know where I can get these. Thanks

Author:	ceej [ Sun Jul 24, 2016 8:37 pm ]
Post subject:
Call T&D. Nevada I believe. Nice stuff. CJ

Author:	Doctor Dodge [ Mon Jul 25, 2016 6:54 am ]
Post subject:
Quote: ... I was looking at some of the discussions, and cant seem to find any positive on the subject... I have run roller lifters & roller tip aluminium rocker arms on a SL6, with little to no improvement in performance. The bottom-line, you are better off spending your time & money on other types of engine or chassis up-grades. Just my 2 cents... DD

Author:	Badvert65 [ Mon Jul 25, 2016 7:32 am ]
Post subject:
Hey Doc... The only reason I see for roller rockers would be a change in rocker arm ratio or to ensure you have the correct 1.5 ratio. Is there a reliable way to ensure you get 1.5 ratio with the factory rockers? I have heard that they are all over the place as far as ratio goes.

Author:	Joshie225 [ Mon Jul 25, 2016 7:51 am ]
Post subject:
If you look at the head and valve gear you'll see that the valves point away from the rocker shaft. This means that longer valves make for a slightly higher rocker ratio. Once I ordered pushrods too short. I used lash caps on the valve stems to compensate and I ended up with valves that got off the seat sooner and were lifted a little higher. I wish I had measured the lift change, but the car needed to be together for a race. I was surprised at how well it ran with the little Oregon 819 cam once I got the compression up and put big valves in the head. The lash caps worked find on the road race car and should hold up fine on the street too as there is more load-bearing area between the valve and rocker. With an adjustable pushrod, a lash cap and dial indicator it would be easy to measure the difference in valve lift.

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Roller Rockers/lifters https://slantsix.org/forum/viewtopic.php?t=59934	Page 1 of 1

Author:	Doctor Dodge [ Mon Jul 25, 2016 7:57 am ]
Post subject:
Quote: ... I have heard that they (the factory rocker arms) are all over the place as far as ratio goes. I have measured a lot of factory rocker arms and they range from 1.48 to 1.52. Most are in the 1.49 to 1.50 zone. Doing the math... a 1.49 ratio drops the lift at the valve by .004 so it is not much difference. DD

Author:	slantzilla [ Mon Jul 25, 2016 8:53 am ]
Post subject:
I did back to back to back testing on my junk between stock rockers and 1.6 RAS rollers at the track. There was no difference in either ET or speed. Rollers are good if you have a lot of valvespring pressure and are breaking stock arms.

Author:	Joshie225 [ Mon Jul 25, 2016 10:35 am ]
Post subject:
Quote: I did back to back to back testing on my junk between stock rockers and 1.6 RAS rollers at the track. There was no difference in either ET or speed. Rollers are good if you have a lot of valvespring pressure and are breaking stock arms. If I remember correctly that was with a full race cam. I'd be interested to see the results from a change from 1.5 to 1.6 rockers on something more tame.

Author:	Badvert65 [ Mon Jul 25, 2016 12:52 pm ]
Post subject:
Quote: Quote: ... I have heard that they (the factory rocker arms) are all over the place as far as ratio goes. I have measured a lot of factory rocker arms and they range from 1.48 to 1.52. Most are in the 1.49 to 1.50 zone. Doing the math... a 1.49 ratio drops the lift at the valve by .004 so it is not much difference. DD That is great news. I had planned on going with the stock rockers, but was a little concerned about how they might affect valve lift.

Author:	DusterIdiot [ Mon Jul 25, 2016 1:27 pm ]
Post subject:	Lol...
Quote: I had planned on going with the stock rockers, but was a little concerned about how they might affect valve lift. If you really are anally retentive or just too detail oriented, you can go through a couple dozen engine's worth of rockers and check for consistency and put a "matched set" together....

Author:	Badvert65 [ Mon Jul 25, 2016 1:56 pm ]
Post subject:	Re: Lol...
Quote: If you really are anally retentive or just too detail oriented, ME?? Been accused of that before, but in this case, I did hear that the stock rockers were usually way off. I don't have the mind set to check them so I would rather hear from those that know. AND...to Twister6, apologies for the thread hijack.

Author:	twister6 [ Mon Jul 25, 2016 5:24 pm ]
Post subject:
Looks like I started something. Sounds like a waste of money for the rollers. I did hear that the stock ones were all over the place on the measurements. Although I did get mine from Clifford 8 years ago, and they told me that they were 1.5's I never measured them either, just put them on and ran it. No telling what they measure from them. I'm just rebuilding my 225 with high compression pistons .045 over with the Molnar rods. I found a windage tray online, just trying to make it run better,,the slants need all the help you can give em. Any ideas from yall will help me on this build.

Author:	Badvert65 [ Mon Jul 25, 2016 6:06 pm ]
Post subject:
Quote: Looks like I started something. No harm, no foul. I don't think anyone on this forum has any bad intentions, just some basic and frank advice. I'm cool with that. The point is, money can be better spent than on fancy rocker arms. As far as builds go, just keep in mind that you are only dealing with 225 cubic inches. If you want a driver, keep things conservative. You can still make enough power to enjoy the ride. -Matt

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