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Reapist
Gen I
 
9/14/2007
09:09:50
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 Subject: Converting to Chevy rockers
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This is an exerpt from an Engine Master's article on the Magnum engine where they talk about the Edelbrock Magnum heads:
"The valvetrain arrangement departs from the production Magnum theme, as the heads are fitted with 3/8-inch studs and guide plates to accept common small-block Chevy rocker arms. This may seem strange, but actually the spacing in the stock Magnum makes the valvetrain interchangeable with Chevy rockers. Stock Magnums are converted to aftermarket Chevy rockers by removing the stock paired pedestals and rocker attachment bolts and substituting studs and guide plates. The complication in OE heads is that the heads are tapped for 5/16-inch fasteners, rather than the 3/8-inch specifications required for typical aftermarket studs. Special studs with reduced thread diameters to match the heads are used for this conversion."
With this info you should be able to convert to roller rockers on the cheap.
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.boB
Dodge Dakota
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9/14/2007
12:36:19
| RE: Converting to Chevy rockers
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Cheap? Not IMO. You're looking at around $400 or so. With some of the rocker kits you need differant valve covers for clearance, so add another $125'ish.
If you just want to increase the rocker arm ratio, you can bolt on a set of Viper arms for <$100. Pretty much the same results.
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Reapist
Gen I
9/14/2007
14:09:00
| RE: Converting to Chevy rockers
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But the vipers are not roller tips are they? Also, you should expect to have to change the valve covers in any event. That said, you can still but a set of SBC roller rockers much cheaper than you'll buy the Mopar Performance set for.
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daddio
Dodge Dakota
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9/14/2007
14:26:36
| RE: Converting to Chevy rockers
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unless you're needing fractions of hp for racing the non rollers would be fine. i don't think you'd notice the power difference on the street. especially for the price difference.
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Reapist
Gen I
9/14/2007
15:42:01
| RE: Converting to Chevy rockers
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That's true. However, on street use you may find the longevity increaced due to the absence of side force loading on the valve stem.
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daddio
Dodge Dakota
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9/14/2007
15:49:44
| RE: Converting to Chevy rockers
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that statement sounds like a sales pitch. i don't think they have any rpoblems with the stock 1.7:1 non-roller on the V10's.
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N56629
Dodge Dakota
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9/14/2007
16:53:30
| RE: Converting to Chevy rockers
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I believe there both Chevy and Ford rockers that will fit these engines using the correct studs. Mine are Ford with Olds guide plates. I've got the specs some place if anyone is interested. They are Comp Hi-Tech Stainless 1.7 Roller Rockers.
Only the big bulky adjustable aluminum rockers require additional clearance. That won't cost you $125 to fix, just a big rubber hammer.
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.boB
Dodge Dakota
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9/14/2007
23:40:34
| RE: Converting to Chevy rockers
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Engines without roller rockers arms last 150-200K miles. How much more longevity can you expect with roller tips?
Is there more power with a roller tip? Sure. But not much. And most of that power is at higher rpm's. And it's a very small amount. Not cheap hp, there. You'll pay $300 more to get 1-2hp at the top end. If you're racing it might be worth it.
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N56629
Dodge Dakota
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9/17/2007
20:13:58
| RE: Converting to Chevy rockers
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You figure that 1.7 rockers only add 1-2 hp? Or, are you suggesting that the price difference between roller and non-roller is $300? I picked mine up for no more than $350.
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.boB
Dodge Dakota
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9/18/2007
12:50:29
| RE: Converting to Chevy rockers
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No, the differance between roller and non roller in these engines is only around 1-2hp. Not enough to feel on the Butt-O-Meter.
Roller tips increase power and longevity in high lift cams with high side loading of the valve stems. Most engine builders say use a roller for any lift greater than about .550. In low lift cams, there's no real differance in either power or longevity.
If you got your complete roller set up for $350, you got a good deal. Be happy about that.
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