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Author Topic:   HELP WITH SPORTSMAN II HEADS
IMCAMOD17
Dirt Roller

Total posts: 24
posted August 11, 2002 02:02 PM
Do you need to change push rods or any other parts when switching to world products SPORTSMAN II heads? Our rocker arms seem to have too much free play in them after we set the valve lash. You can wiggle the rocker arms side to side quite a bit. It looks like they will move a lot when the engine is running. Would putting guide plates on help this? Thanks for any help.

6pack
Dirt Maniac

Total posts: 128
posted August 11, 2002 03:57 PM
Yes, the Sportsman 11 heads are designed to be used with guide plates.

IMCAMOD17
Dirt Roller

Total posts: 24
posted August 11, 2002 04:24 PM
but i can still use my old push rods right? dont need longer ones or anything else to swap over to the sportsman heads? thanks.

carscomefirst
Dirt Full Roller

Total posts: 45
posted August 11, 2002 06:24 PM
You need hardened push rods to go with the guide plates. Make sure that the guide plates are for the correct diameter push rods. IE 3/8 to 3/8, 7/16 to 7/16 ect...

Monster
Dirt Maniac

Total posts: 135
posted August 11, 2002 08:52 PM
Pushrod length depends on a lot of things, like valve length, head milling, block milling, rocker arms, etc. I can't recall doing a set of Sportsman heads that did not require a pushrod that was longer than stock. If you don't know how to determine the length needed, Moroso makes a tool for less than $10 that makes it easy. A proper length pushrod adds a tiny bit to power output, and a whole lot to reliability and longevity. A pushrod that is too short lessens the clearance between the rocker arm and spring retainer. This is a critical clearance point that a lot of guys overlook. If they touch, the valve is opened by pushing on the retainer instead of the stem. This will lead to very bad things.

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