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Old 02-29-2008, 05:30 AM
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roller rocker arms

i want to swtich from the stock rocker arms to the roller rocker arms. so how do i tell what size rocker studs are in the heads either 3/8 or 7/16th and whats the difference between 1.5 and 1.6 ratio i have a Comp cam 292 i have to look up the spec on that.... 350 chevy

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Old 02-29-2008, 06:05 AM
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The factory stud size is 3/8, 7/16 studs are used mostly on small blocks with heavy duty valve trains that see extreme service or just someone wanting a little more support. The 1.5 ratio is the "factory" ratio, but stock rockers are out to lunch on this as much of them have a ratio of around 1.4
Most cam lifts are given with a 1.5 rocker ratio, by bumping up to a 1.6 you'll add about .030 in lift and around 1 degree of duration. Example if your cam has .500 lift with a 1.5 rocker, moving to a 1.6 bumps it up to .530
Make sure you get a quality name brand set of rockers, cheap brands like proform or Cat, is made off shore and the quality and the ratios aren't up to par. You get what you pay for.
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Old 02-29-2008, 07:04 AM
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I'm running Harland Sharp, reasonable price, good quality, and made right here in the USA. not to mention they are a really cool orange color...it was hard to bolt the valve covers back on knowing i would only see those fancy things once in a great while.
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Old 02-29-2008, 07:52 AM
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roller rockers

whats so wrong with proform products??? they cant be no more junk than the speed-pro pistons that everybody brags on in here...
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Old 02-29-2008, 08:52 AM
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If your heads have screw in studs I'd go with 7/16 all the way. It will make you valve train more stable.
I'd go with Scorpion rocker arm. It's made in USA at cheaper cost. We never had any fail yet.
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Old 02-29-2008, 09:47 AM
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Quote:
Originally Posted by fast 79 malibu
whats so wrong with proform products??? they cant be no more junk than the speed-pro pistons that everybody brags on in here...
Proform cra# is made in China.

Vince
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Old 02-29-2008, 09:54 AM
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Of all the ways there are to spend money, roller rockers is certainly one of them. Not only are they a terrific way to spend money, now you can begin to worry about when one will break - especially if you haven't installed those little screens in your oil return passages to catch the bits.
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