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Rocker arms

Chevy305

Chevy305

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Question: Can I put 1.6 roller tip rockers on my 83 305 without having to machine the heads or having spring binding issues?

Also I noticed this weekend that I may have 1 or 2 slightly bent push rods :crazy:, what causes this? The engine runs like a champ so there are no adverse effects so far...
 
What cam are you running? If its stock .390/.410 I wouldn't see a problem increasing the ratio. If its more than .450 or so, you might want to check the springs for pressure at open lift, to see if they are strong enough, and don't bind. Its always said whenever you change anything in the valvetrain to check valve to piston clearance, but you should have .100 V/P clearance (most likely more) if its stock stuff. Bent pushrods? how bad, can you see the bend or are you rolling them across a smooth straight bench or glass pane to see it. They are cheap to replace.
 
yeah its stock cam. so I don't think I will have any problems.

I didn't take the push rods out because I would have rotate the engine to the TDC on that piston and my distributor was out so I didn't want to mess up timing. I just rotated the rod with my fingers and there was a slight curve in 2 of the push rods. Plus I don't think you sould be able to rotate the push rods, my valves must need adjusting. thats pobably why there is a slight bend in at least 2 of them.
 
Chevy305 said:
Plus I don't think you sould be able to rotate the push rods, my valves must need adjusting. thats pobably why there is a slight bend in at least 2 of them.
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yes, you SHOULD be able to rotate the push rods with your fingers, just so there's no "slop" in the movement and maybe barely alittle tension.

Pushrods? stock Chevy 305/350
 
well there was no "slop" in the push rods as you describe it. I should eat my words because my Hilton's manual says to make sure you can't rotate the push rods. and we all know how reliable Hilton's is...
 
funny you mentioned this. I really dont know about solid lifters but when I originally tried the Haynes way of adjusting the rockers I ended bottoming out the hydraulic lifters before the thing would quit spinning. I ended up setting zero lash and the a 1/4 turn extra. Seems to work good so far, but I am going to pull the valve covers and check them next week to make sure that they havent developed any slop.
 
The pushrods will spin when they are going up and down, not sure of the reason why they were designed to do this, never really cared, but thats what i have been taught, and always seen out of a sbc with hydro lifters.
 
Sorry it was was Hayne's not Hilton's :crazy: :doah:

I don't know why I thought it was Hilton's
 
4xcrazy said:
The pushrods will spin when they are going up and down, not sure of the reason why they were designed to do this, never really cared, but thats what i have been taught, and always seen out of a sbc with hydro lifters.
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Maybe cause the lifter also rotates. My understanding is that cam lobes are ground with a crown to make the lifters rotate, preventing uneven wear on the face of the lifter. I assume that the pushrod would also have to rotate in order to keep from binding on the lifter.
 
Sorta bump!

Can I put 1.6 rocker arms on my engine without having to machine the heads?
 
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