1st can i run a set of pushrods .100 longer in a 350 with adj roller rockers ? what are the advantages and dis adventages of changing length. thanks in advance .

You only need to change length if the rockers not centered on the valve stem. Longer push rod will not give more lift if thats what you're thinking.

Pushrod length is usually to solve valve train geometry issues. When using some aluminum heads, roller lifters, decking the block etc. Custom length pushrods may be needed. The center of the rocker arm tip should start just before center of the valve tip. At mid way through cam lift it should be a little past center and at full lift it should be center of the valve tip. I am not aware of any performance gain in just using longer pushrods. Anyone?

Bill

no i have a chance to buy a set of magunm comp cam pushrods for sbc /on e bay /but they are .100 longer than stock .i need a set for my 350 .i have guide plates .dont want to bid if they will give me problems what do you think ?

Longer pushrods just mean you'll have a different adjustment to do to adjust your valves. You won't have to screw your rocker adjusting nuts as far as the rest of us. :)

They will not work for your application. You need stock length.

thats what i thought but id thought id ask .stock length it is thanks for the info

If you haven't checked your geometry with the new rockers, you have no idea what the correct length is.

Pushrods are the LAST thing you buy for a longblock. Too many other things affect the required length.

Time to buy an adjustable pushrod and a couple of checking springs.