Thread: Head gasket and rocker arm failure - Cause?

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Rocker looks like it was to tight. Motor looks kind of dirty for 3k miles??Is the dot on the back piston facing the rear of the motor??never took a 3K mile motor back apart but the cyl walls look shinny also, seems like it should still have some signs of the honing if only 3k miles??

Maybe 3k was too little. It was driven rarely over 3 years by a freind of mine. Driven hard too.

dots go to the front they are on the rods right.

dots go to the front they are on the rods right. the rocker look like they were running off the valve stems they should be in the center line of the valve look at your push rod guildes move them to get the valve in the center of the valve stem if you can not do it then use isky adj guide plates is will keep it from side loading the rocker and check the push rods make sure they are the right size not to long or to short . on them rockers i do not care much for them if you want roller i would get a set of crane or any thing but proforms or a stock shoe type with no roller tip oh by the way you do know them valve stem will have to be cut on the stems? to get them flat . and i would get both heads cut flat them holley head some times have crapy finsh on them out of the box . and it looks like the rocker were running on the valve retainers to lucky out did not blow it to hell .do them heads have any push rod guide plates? if not you need some

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Originally Posted by DennyW

I was looking your pictures over, and I got to tell ya, this this has been run hard. I see a ridge at the top, cylinder wall scratches, and lots of carbon type grit. And yes, the rockers do not look centered, and they are side loading.

ummm maybe i am looking at it wrong but are those pistons in the 1st pix even the same? and for a rebuild why would you even mess with cast pistons and it looks like the valve hit the gasket the gasket bore size is too small but ummm hey just wow never seen a rocker tip to that