Here’s the post we’ve all been waiting for – the miraculous VPD magical cylinder head. I’d like everyone to think about something before you scroll down and look at the pictures. I paid $1000 USD (2 years ago – so about $1200 Canadian at that time) for the head alone. Keep this in mind as we embark on our odyssey of discovery and stand (or sit) in awe of the brilliant craftsmanship that is much lauded on the Brickboard, TurboBricks and various other performance vintage Volvo sites.
Here’s what $1200 bucks gets you.
First shot of the head – note that the mating surface for the intake and exhaust has not been faced flat – and is rusty. Not a good start to our adventure.
Top photo of the head…sealing surface for the valve cover not faced. When I unpacked the head, valve spring number 2 (read from the front) had the pig-tail sitting on the valve cover gasket mounting surface – nice assembly job! It snapped nicely into place when I pushed it over.
Bottom of the head – valves have been checked apparently. The discolouration on the machined surface is rust – yes rust. It was cleaned up with WD-40 prior to shipment.
Close-up view of the rust marks. Impressive craftsmanship. Well New York state is more humid than Lethbridge, and the head was apparently sitting machined face down on something.
This is what I wiped out of the combustion chambers – the ports are equally bad and touching the casting will make your fingers turn black. This is what sitting in a shop for literally years with grinding etc going on will produce.
Port work – I thought exhaust ports were supposed to be smooth? Also note rust. They feel every bit as rough as they look. The exhausts have a bulge towards the top on the sides and an arc carved into the top. The bottom of the casting is untouched (as it should be) the short side radius has the front edge smoothed. Most of the work is at the valve. They are relieved around the valve seat.
More port work examples.
Middle exhaust port set – nice work. Damn that must have taken so long to do. I'd give myself 3 hours tops.
Undercut – swirl polished valves look OK from this angle. The bottom of the port is not really out of focus – it is fuzzy with oily crap. I figure the majority of the flow improvements over stock are due to the valves and the valve job.
The next 4 photo’s show the valves from the sides – photos from front to back. I thought valves were supposed to be the same height?
Next set, neither valve is touching the straight edge by the way.
This one’s concerning, the valve on the right is ground on an angle, that is not a camera trick. This helps flow, perhaps?
Perhaps the best of the set – cylinder 4, there must be 30 thou worth of difference in these heights.
So there you have the pictorial essay of the year. I don’t know what to do, but I’m not going to post these pictures on TBrix or Brickboard until I get my springs and clutch fork (he forgot to ship the clutch fork for some reason – it’s on the bill, but not in the box). I don’t need any help with depression at this point and will likely have to take the head into my machine shop to get the intake/exhaust face cleaned up (could do it with a file I suppose). I don’t know what do about the valves – the height thing is just a lack of craftsmanship on the build side, the one that is angled worries me. How is that valve supposed to rotate when the top is ground at an angle? Well, I suppose the problem is it will rotate and eat my rocker arm.
Scotch helps.
Craig