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The rocker arm ratio (whether they be stock or roller rockers) has to do with the offset of the rocker fulcrum. The stock rocker ratio on the small block Chevy is 1.5:1. This is important because it effects your valve lift. For example, a camshaft with .300 lobe lift will yield a .450 valve lift with the stock 1.5 ratio rockers. Multiply the lobe lift times the rocker ratio to get your valve lift. Now, that same camshaft will yield .480 lift with a 1.6 ratio rocker arm and .510 lift with a 1.7 ratio rocker arm. More lift is good as long as your valve springs can handle the extra lift and you don't run into valve/piston interference problems. You are more likely to run into coil bind with the valve springs than an interference problem though. When in doubt, make sure to check just to make sure there will be no problems.
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What ratio rocker arm does the 87 305 GM roller motor use?
1.5:1
What kind of cam do you need with roller rocker arms?
Roller rocker arms can be used with most any cam.
How can you tell if my Pontiac 400 has roller rockers?
Take off one of the valve covers, if the rocker has a roller tip on the side which it touches the valve spring then its a roller, if no roller tip is present then its a normal tappet rocker.
What do roller rocker arms do?
Roller rocker arms perform the same function as standard rocker arms. Mainly, they are the mechanical link between the push rod and the valves. Roller rockers are better because they have a cylindrical roller that reduces noise and friction instead of simply having a flat spot directly contacting the top of the valve.
Do rocker arms change duration?
Yes they can depending on which ratio rocker arms you get.
Rocker ratio for a 1995 silverado 5.7 V8?
STOCK is 1.5 ratio.
How can you know if your Chevy 4.3 V6 is a roller cam engine or not?
pull a valve cover and look for roller rocker arms.
How can I tell if a Chevy 350 is a roller cam or flat tappet?
If it has center hold-downs on the rocker covers, it's probably a roller cam.
Will 1.6 roller tipped rocker arms work on your stock 1985 corvette?
Yes.
Will roller rocker arms fit under stock valve covers on 4.3L Chevy V-6?
If you have a 2001 or newer engine, it comes with roller lifters and roller rockers from the factory.
What is a factory Rocker arm ratio for Chevy 350 1988 and is it different for a marine than for a auto?
The stock rocker arm ratio for a Gen I Chevy small block is 1.5:1. The marine engines have the same rocker ratio, but use different cams and have bottom ends built to handle sustained RPMs.
What size of rocker stud is on the 1.6 roller rockers?
They can be ordered with 3/8" or 7/16".
