Would my engine benifit from Roller Rockers & Hedders? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-25-2006, 11:35 AM
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Would my engine benifit from Roller Rockers & Hedders?


I'm trying to do a budget build for my 66 Caprice 4D HT and was wondering if roller rockers and hedders would be worth the extra $300.
Here's my engine:
350
.030" Hyperutectic Pistons
Stock crank and rods
64cc heads 1.94"I & 1.5"E
Comp cam 270/270 adv duration .470/.470 lift
HEI
Edel Performer RPM intake
Edel 600 CFM Carb

TIA

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Old 03-25-2006, 12:36 PM
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Yes on the headers as long as the rest of the exhaust is done properly. Mandrel bent pipes, crossover or x-pipe and decent flowing mufflers. If you cork it up with crimped bends no crossover and cheap mufflers you'll probably get nothing but leaky gaskets for your efforts.

No on the rocker arms. Your heads probably don't have enough of an increase in flow above 0.470" lift to take advantage of the valve being opened any further than that.


Larry
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Old 03-25-2006, 03:35 PM
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Quote:
Originally Posted by coldknock
Yes on the headers as long as the rest of the exhaust is done properly. Mandrel bent pipes, crossover or x-pipe and decent flowing mufflers. If you cork it up with crimped bends no crossover and cheap mufflers you'll probably get nothing but leaky gaskets for your efforts.

No on the rocker arms. Your heads probably don't have enough of an increase in flow above 0.470" lift to take advantage of the valve being opened any further than that.


Larry

I agree 100%. Take the extra money and use it to buy a quality set of headers like Hooker. Cheapos are fine, But Hooker, IMO is worth the xtra coin.
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Old 03-26-2006, 12:29 PM
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Roller roskers and headers.

1.5 roller rockers won't open the valves any more, just reduce friction and maybe increase RPM.
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Old 03-26-2006, 07:14 PM
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Don't believe the ads. They want you to buy that nonsense and then buy the rocker arms. You'll never see a performance increase, on a time slip, from a rocker arm swap on a mild street engine with stock heads. The only benefits I have ever seen is reduced valve guide wear, and they're pretty to look at before you cover them up.


Larry
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Old 03-27-2006, 07:04 AM
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Comp Cams did a back to back test(stock rocker vs roller) with their rockers and gained 12 hp at the crank..... BUT.... that was on a 400hp sbc.

I don't think you will see any improvement of HP on a stock engine(or enough that the SOTP meter would read)
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Old 03-27-2006, 09:26 AM
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Yes, headers and rockers will help. The headers will help the most.

Stock rockers are typically less than 1.50 (1.48). Rollers will be 1.52 or 1.6's.

On a 0.475" cam (rated for 1.50 ratio) the difference will be 0.468 inch lift for the 1.48's and 0.480 inch lift for the 1.52's.

Go to chevyhiperformance.com and look at their old tech articles. If I remember correctly, a cam that big will pick up 30 to 40 hp with headers and 5 to 10hp with the roller rockers.

Your carb sucks. Get a Holley 3310 750 vacuum sec.

You are using the correct valve springs for your cam, right???
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Old 03-27-2006, 02:07 PM
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Quote:
Originally Posted by bigbadbowtie
Comp Cams did a back to back test(stock rocker vs roller) with their rockers and gained 12 hp at the crank..... BUT.... that was on a 400hp sbc.

I don't think you will see any improvement of HP on a stock engine(or enough that the SOTP meter would read)
You see that Comp paid for it. That'll tell ya something.

Reduced guide wear and More accurate ratio's are great to have. Easier to adjust hyd rockers too.
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