Roller Rockers??

I believe the ZDDP issue comes into play more with the high pressure areas such as cam/lifter contact points. After 20,000+ miles I have no measurable wear where the guide plate and push rod are in close proxsimity.

BTW, I'm using an oil that still contains a "full load" of ZDDP: Mobil 1 15w-50.

Z .Ray

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Would I have the same problem with a windsor [sp] head? They are not hipo, so no recessed spring seats. Would you recommend guides then? Just wondering.<img src=images/icon_smile_approve.gif border=0 align=middle><img src=images/icon_smile_approve.gif border=0 align=middle>

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Windsor heads do not have the cast guide slots so guide plates are required.

Well, decided not to pull the heads and complete the opening of the guide slots with the heads in place since the slot is only about the top 1/2" of the overall length of the opening through the head for the pushrod. I just didn't want to open the can of worms that may have come about by removing the heads. I covered the lifter valley with a layer of custom fit cardboard taped neatly to all edges and then did the same with the heads leaving only the slots exposed. I placed a magnet at the bottom of the hole to catch shavings while drilling and had an assistant run a shop-vac right next to the drill as I was drilling. I used a right-angle drill with a 1/2" stepped uni-bit. Worked like a charm!!

Before:

[Blocked Image: http://i214.photobucket.com/albums/cc295/mrkadra/DSC02100.jpg]

After:

[Blocked Image: http://i214.photobucket.com/albums/cc295/mrkadra/DSC02119.jpg]

Ready to install the guide plates and get the car back on the road.

Mark