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It does not look like it would be very hard to pull the four heads in place. has anybody tried it?

Yes - Its very doable. I replaced one cylinder's piston and rings with the engine in the truck - just expect to drop all of the exhaust headers and have a couple of replacement header studs and nuts on hand. Reassembly is pretty straightforward as well.

Did it require any special tools?

Jimmy do you have a service manual? Basic tools are needed for head removal, but there is a specific order that things have to be done in. If you need to pull your heads, invest in a service manual to help. Not hard at all but you'll need torque specs putting it back together.

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I have a manual, but do not think it always tells the full story. It makes mention of a tool to align the heads but says you can use a straight edge instead.

I was also wondering if someone would say "just pull the engine it will be easier".

I have been looking through the shop and parts manual and am surprised to see there is no head gasket. I have never changed a head on an engine with no head gasket. I have been reading about Volkswagen air-cooled heads which seem to be arranged similarly. There they talk about lapping the head to the cylinder. Does this need to be done on the Pinz? No mention of it in the manual.

Part of my dilemma (pull engine and rebuild or just try the heads) is that me and the truck are at my camp-house, about 700 miles from my shop. I am thinking I can do the heads here, but if I want to pull the engine I need to go to the shop.

Just replaced my #2 piston, cylinder and head. Had to pull 3 of the 4 heads to get at it properly. No issue doing it in the truck, I would not do it any other way. No gasket, no issues. Follow the torque specs and away you go!