[1971 AT Squareback] Cylinder Head Replacement Recommendations

[Braeska]

Hi pals, so my 1971 squareback has been having some running issues, I'm pretty sure I nailed it down to a burnt up exhaust valve seat on cylinder #3, the rocker adjustment kept loosing clearance and it quickly kept coming out of adjustment until it lost a full turn in one day. I was also experiencing a significant power loss even when re-tuning the engine the best I could and I just kept steadily loosing top end speed and acceleration. Given that this has been my daily driver for almost four years, I can maybe assume it's time to put her out of commission and replace the cylinder heads.

I was thinking of purchasing a pair of the ACN stocker plus from aircooled.net
http://vwparts.aircooled.net/ACN-Stocker-Plus-Dual...m?CartID=1

Before I did though, does anyone have experience with them? I like the sound of 15-20% flow increase and all but I'm just looking for a stock bolt-on replacement. I have an automatic as well so I want to make sure they wont throw off the vacuum signal or anything. Running duel port heads with duel solex pdsit3's with a stock air cleaner, heat exchangers, and everything else about the engine is stock from it's fuel injection days as far as I know, even down to the original FI distributor. I also wanted to know which pushrods I should get, I kind of want to stay with aluminum so I don't have to worry about zero valve lash with steel. I'm still kind of learning everything as I go but want to get the best quality parts. Any and all advice is appreciated!
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|| groovy baby yeaaa ||
'71 Squareback (Eileen)

[KTPhil]

Whatever heads you choose, inspect them carefully for excess casting flash. Many block so much air they will cook under normal driving. You may have to spend a day with a long dremel tool to clean them up.

[Mike Fisher]

Take your heads to your local machine shop for a valve grind and new exhaust valves etc. They can measure/machine/balance your engine too.
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69 FI/AT square Daily Driver
66 sunroof,67,70,71,71,71AT,72,72AT,73 Parts
two 57 oval ragtops sold
'68 Karmann Ghia sold

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[Multi69s]

[Braeska]

[andrewvwclassic]

[Braeska]

Hi guys, wanted to revive this for a few more questions and to give an update. (This might turn into a rebuild thread)

I wanted to take the advice of saving the environment and planned on taking my heads to get them remachined, but upon disassembly I found that a valve seat was completely loose and had fallen out. Not to mention a sizeable crack in the head between valves. I went with the next best thing and purchased a set of good type 3 head cores here from the samba and plan to take these to a machine shop and have them rebuilt and lapped.

I figured with the engine out I would do a complete disassembly and rebuild per the Bentley manual on my weekends. Glad I did since I discovered two cracked pistons and broken cylinder fins. Decided to purchase a new set of stock Morisa cylinders, pistons, and rings. The ones from Mexico I guess.

Now that I have the crankcase split at my mechanics shop, there’s noticeable typical wear on the bearings, camshaft and lifters on the #3 cylinder.

I wanted to know what my best course of action should be now, do you guys recommend I purchase a new camshaft and who has the best quality? What parts are typical to replace? or can I have rebuilt? I have yet to measure wear limits on the bearings nor the crankshaft. But I can update soon with some photos. I know I’m taking on a big project and this is my first time rebuilding a VW motor, so any tips are welcome!
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|| groovy baby yeaaa ||
'71 Squareback (Eileen)