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Old 08-19-2011, 03:56 AM
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1.6 rockers really worth it on 4x4

So heres my question would it be worth putting 1.6 rockers on my 350 its has,like 6k miles on but its stock just roller timing chain edle intake holley 650 I have
624 heads (bad I know), I,know have to check for valve clearence but these will only be here a while because the motor is gonna be made to 383 down the road so theyll be put on there, this is in my k10 with,35s right now the rockers are lunati voodoo ones for 140 from a friend

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Old 08-19-2011, 07:12 AM
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RE: Voodoo rockers

I have heard of issues about retainer interference, I would save my money to buy the right parts combo for the upcoming build. I have many parts in the shop that I bought for what seemed to be a deal at the time that go unused, ask your machine shop guy for what will work the best for what you are after. JMHO
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Old 08-19-2011, 07:38 AM
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Why not just install them after you build your 383? I've heard of people having issues with push rods hitting the slots in the factory heads . There are slotting tools out there (or die grinders) to open up those holes. I don't know if you'd have an issue or not but it's something you should watch for.
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Old 08-19-2011, 07:50 AM
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NOT worth the effort

If you install 1.6 rockers, you need 7/16" rocker studs, chromemoly push rods, and the push rod guide holes in the head must be clearance towards the stud. The push rod is moved .060" closer to the rocker stud when you covert to 1.6 rocker arms. The faster valve lift rate and 10% higher valve lift promotes a bit more low end torque but what you get is not worth the effort.

Get a get a camshaft with the specifications that you want and use 1.5 rocker arms.
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Old 08-19-2011, 08:02 AM
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1.21 giga-watts???!!!!
 
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NO need to increase rocker stud size to 7/16. 3/8 will work fine.
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Old 08-19-2011, 08:09 AM
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&/16

The 3/8" studs are more like to flex or even break and the plain mild steel push rods are more likely to break or bend with the increased side load created by the 1.6 rockers. Every GM engine that uses 1.65 rockers has 7/16" studs...go figure.

You should check the valve springs to make sure they can accept 10% higher valve lift with at least .050" clearance between the coils if you use 1.6 rockers.

Is all that crap still worth the effort for a few pounds of low end torque?
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Old 08-19-2011, 08:25 AM
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I don`t see why it would cause that much havoc on a round lobed stock cam profile. 3/8 should be more than enough for that.
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Old 08-19-2011, 08:30 AM
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I would only use 1.6's if you have a stock or "low lift" cam and don't to change cams.

Otherwise, install the "proper lift" cam with the 1.52 rockers.
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Old 08-19-2011, 09:12 AM
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1.21 giga-watts???!!!!
 
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Quote:
Originally Posted by 454C10
I would only use 1.6's if you have a stock or "low lift" cam and don't to change cams.

Otherwise, install the "proper lift" cam with the 1.52 rockers.
Exactly the right way to do it. Maybe up the lift to the .510 range with the 1.6 rockers using the 3/8 studs. Again, 3/8 studs will work fine.
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Old 08-19-2011, 10:58 AM
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Thx for the feedback so ill just buy them for the 383
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Old 08-19-2011, 01:09 PM
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Quote:
Originally Posted by Syn77
Thx for the feedback so ill just buy them for the 383
Well, I don't think you will need them for the 383, as I hope you would be installing a new cam in the 383. So, get a cam that has enough lift in the first place and doesn't need a 1.6 rocker band aid.

Again, 1.6's are good band aid fixes for stock cams or relatively low lift cams.

Also, be aware that more lift on an already aggressive lift cam can lead to the cam going flat.
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Old 08-19-2011, 01:26 PM
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1.21 giga-watts???!!!!
 
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Agree, again the previous poster is on spot. The new camshaft lobe profiles like the Extreme Energy and Lunati Voodoo are extremely aggressive and a 1.6 lifter can exaborate that aggressiveness too much.
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Old 08-19-2011, 04:58 PM
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As a side note, many cams w/those "Voodoo" or "XE"-type lobes say explicitly to NOT use 1.6 rockers. As has been correctly said already, select the camshaft w/the specs you want, using 1.5 ratio rocker arms.

When you build your 383, use 0.080" wall pushrods hardened for guideplates unless the cam maker recommends something else. That much wall thickness w/a stock diameter p-rod will handle most street cams. Obviously if you go w/a solid roller or big solid cam you will want to use stiff p-rods and strong springs, etc. But that's a whole 'nuther deal.

Quote:
Every GM engine that uses 1.65 rockers has 7/16" studs...go figure.
But every factory Gen 1 SBC has used 3/8" studs- go figure.

Ain't talking about a few Pontiac engines here. The poster is talking about a SBC and 1.6 ratio rockers.


There are places where 7/16" studs are advisable, but it's not on a stock cammed engine- even with 1.6 rockers.
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