Push rod question, Aluminum or Chromoly?

[212degrees]

I am building a 1904 for my Vert Bug.
Will the Aluminum stock push-rods work?
Here is what I have thus far:

1. B6 (dual oil relief case, once over) cut for 90.5's
2. New CB forged & C/W'd crank 74mm
3. Engle W110 cam (I reused stock gears)
4. New Silverline bearings
5. I-beam 5.325" rods
6. Piston kit (Hypereutectic)
7. CB heads, 40X35.5 SS valves, single HD springs.
8. Solid rockers with stock 1.1:1

Thanks guys.

[smitty24]

they make heavy duty aluminum that are quieter than the chromoly. I use them on my current engine. I had the chromoly on my 1904 and they were loud. There are a lot of places that sell the hd aluminum. I wouldnt use stock.

[Howard 111]

Better figure out the valve train geometry. Stock length may be too long, or too short. And with what you have going in this engine, I would choose dual springs and CM pushrods. Fairly cheap insurance it will last!
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[jason]

Just get the cheaper HD aluminum ones CB sells, dont need the tapered ones.

[212degrees]

Thanks Smitty.
I'm not sure if my Aluminum pushrods are stock or HD.

[slalombuggy]

No need for dual springs or CrMo pushrods. Figure out your geometry and if the stock ones are the right length run them. I ran a 110 and 1.25s with hd single springs and stock pushrods for years racing auto-x and probably put about 50K miles on the motor with no issues.

brad

[mark tucker]

my chromo's arnt any louder than the oe aluminum on es I had before them, but the aluminum pushrods did not have full tyme oiling. and diferent rockers.

[kevlarian]

So what's the verdict? What are the quietest pushrods?

[AlteWagen]

Chromoly can be quiet if you set them to zero lash, once the engine heats up and expands you will have a few thousands. Most dont know any better and set them to .006 and when the engine is up to temp the lash is excessive and loud.

As long as you run solid shafts with .002-.005 side clearance and zero valve lash cold it will as quiet or quieter than stock.

These days I prefer to use HD aluminum push rods to keep weight down.
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[JohnnyRingo]

I have a 1904 stroker that Pat built at cbperformance.....he used their new super duty aluminum push rods......there quiet and set at .006" in his initial build quote he listed chromoly......then he changed his mind and went with their aluminum, I ask why he said there really nice, and would be quieter.

[mark tucker]

I also set mine when the engine is warm....but for you I would say get the cb hd ones. butt bee sure to get the geo right the first time along with everything else.

[raygreenwood]

[vwracerdave]

Aluminum pushrods will always be quieter the steel. Single valve springs will always be quieter the dual valve springs. Steel transmits noise where aluminum deadens noise.
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[FreeBug]

In any off road situation, or any situation where you don't have easy access to your valvetrain (parking lot?), there is something to be said for being able to check/adjust your valve clearance without having to mess with feeler gauges...just one thing to be said for steel. I run them in my bus, low cost, low performance, no need to get fancy. Reliable.

[bugguy1967]

Aside from the noise factor, chromoly pushrods weigh much more than heavy duty aluminum pushrods. Most people run a 110 cam on heavy lifters, heavy pushrods, unmodified rockers with the extra weight from the aftermarket adjusters, sometimes larger heavier valves, and heavier chromoly retainers. For a single HD spring, it really pushes its' limits. Something to think about.

Idk why you even considered duals for such a mild cam. Lighten your valvetrain and you'll be fine with singles.

[mark tucker]

[quote="bugguy1967"]Aside from the noise factor, chromoly pushrods weigh much more than heavy duty aluminum pushrods. Most people run a 110 cam on heavy lifters, heavy pushrods, unmodified rockers with the extra weight from the aftermarket adjusters, sometimes larger heavier valves, and heavier chromoly retainers. For a single HD spring, it really pushes its' limits. Something to think about.

110?? high rpm cam?? say it aint so!!!! if you build a engine with a 110 and expect a highrpm race motor your infor some effed up stuff&disappointments too. unless highrpm to you is 4000 there are mant things that can be done when building that can alter the noise&wear of the valve train& also the entire engine. like I said befour, for your app I would go for the aluminum cb hd pushrods.

[CiderGuy]

Not to high jack this thread, but I have a question about rust on new stock pushrods.

Due to health, work, and my son going to Afghanistan which really stressed me out, they sat in a unopened box for more then a year.

Should I buy another set of pushrods ?

Thanks
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Cars Currently Owned:

1970 Karmann Ghia Coupe
1973 Karmann Ghia Coupe - Project car for sale
1970 Karmann Ghia Convertible (Body off restoration)

Timing is everything

[raygreenwood]

[67rustavenger]

[bugguy1967]