Fact or Fiction
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Elder User
Joined: Sep 2000
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From: Bay area
Fact or Fiction
I heard from some mechanic that 302's have a problem with the rocker arms hitting the retaining clips on stock heads thus driving the valve into the combustion chamber.
I think he was talkin out his ****!
I think he was talkin out his ****!
Junior User
Joined: Apr 2000
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Fact or Fiction
Don,
The rockers can hit the upper collar of the spring. The rocker arm has a rib on either side of the arm over the valve, this is one of two ways Ford aligned the arm over the valve. As the rocker and valve stem wear, it's not uncommon to have the ribs contacting the collar. This can be modified with pushrod guide plates that controll the rocker arm by controlling the pushrod. It requires hardened pushrods and plates and usually the mounting pad has to be milled down .300 to make room for the plate. He's not talking out his ****.
Jim
The rockers can hit the upper collar of the spring. The rocker arm has a rib on either side of the arm over the valve, this is one of two ways Ford aligned the arm over the valve. As the rocker and valve stem wear, it's not uncommon to have the ribs contacting the collar. This can be modified with pushrod guide plates that controll the rocker arm by controlling the pushrod. It requires hardened pushrods and plates and usually the mounting pad has to be milled down .300 to make room for the plate. He's not talking out his ****.
Jim
Junior User
Joined: Apr 2000
Posts: 89
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Fact or Fiction
As I understand your post, if your mechanic is warning you about the rocker arms, you have a 302 before they called them 50.
The rocker begins to open the valve by pushing on the retainer which allowed the valve stem keepers to make a get-away, dropping the valve into the cylinder. It takes a considerible # of miles or neglect but if you're rebuilding an old 302, either replace the rockers with new rib, or update them with the hard plates and pushrods and the non-rib type rockers.
Jim
The rocker begins to open the valve by pushing on the retainer which allowed the valve stem keepers to make a get-away, dropping the valve into the cylinder. It takes a considerible # of miles or neglect but if you're rebuilding an old 302, either replace the rockers with new rib, or update them with the hard plates and pushrods and the non-rib type rockers.
Jim
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