sweeneyuk

I have some zz4 heads off a 91 vette & want to replace the rail rockers known as self aligning rockers with some roller rockers.

What i need to know is can i use ordinary roller rockers so long as i fit hardened guide plates or are the valve stems longer with the self aligning style rockers?

I have hardened guide plates & noticed the self aligning roller rockers are more expensive than the non self aligning.

is one method better than the other? i.e guide plates vs self aligning roller rockers?

also can any recommend a reasonably priced set?

thanks

92droptopws6

iTrader: (10)

You will need:
hard pushrods up to 120.00
NSA roller rockers narrow body(i preferr 1.6s) for a little more valve lift 160.00-300.00
you already have guide plates
about 2 hours of labor

Sonix

iTrader: (1)

I'd just leave the self aligning rockers. You're not gaining anything by going to normal non SA rockers.

sweeneyuk

is there more valve stem protruding past the spring when sa rockers are used?

how can i tell if i can use sa rockers?

cant tell if the machine shop replaced the valves as i also paid him to fit guide plates before i found out that they are not needed with sa rockers.
he didnt seem too clued up about rail tip rockers & i only found out after researching on this site.

I've not been able to get back in touch with thw machine shop who did the work & its a little difficult to pay a visit as i'm in the uk.

thanks guys

92droptopws6

iTrader: (10)

SA rockers make noise can cause false knock if you are EFI the best safest design is NSA.
check posts about rockers www.ls1tech.com
www.camaroz28.com plenty answers there

Sonix

iTrader: (1)

I'm sorry, but that's ridiculous.

No


Valves need A (singular) method of guiding the pushrods.

-Slots in cylinder head
-Guide plates
-SA rockers

Pick any one and enjoy. If your heads have slots where the pushrods come through (and not big gaping circular holes), then you're done, use non SA rockers.
If they have holes you either need the guide bosses machined for guide plates, and non-SA rockers, of go simple, and use SA rockers.

92droptopws6

iTrader: (10)

if that is soo rediculous why did chevrolet instal a less sensative knock module in the pcm to cancel the added valvetrain noise due to the SA rockers in the LT4 engine along with composite valve covers instead of metal?

SpitotRs305

so if the SA rockers of say a 062 head made more "noise" than say 416's? actually it seems to be they replaced the rockers on the LT4 due to galling of the ***** at high RPMS they went with modified comp roller rockers which are forged AL and produce more valve train noise than the stamped steel... and for the composite covers... who knows maybe they were cheaper...

five7kid

iTrader: (14)

That doesn't sound right. I was under the understanding that they used soft guide plates.

But, wouldn't be the first time I was wrong.
----------
The earth's temperature has been rising since cell phone use has become common place. Think those things are related?

Sonix

iTrader: (1)

I'm glad someone beat me to it Five7, and with a more intelligent quip than I would come up with as well.
When I swapped to SA rockers on my engine there was no noise change, that my in-sensitive ears could pick up at least. Theoretically I can't see why there would be either, the mechanics of the movement don't change to a method that would be "louder".
The gist of my post was for sweenyuk. There needs to be one method. None are really better than the other per se, although guideplates are most common on hot rodder engines - take that as you will.