Modified tool to cut the guides outer diameter. The disc will be the depth limiter. I've turned it yesterday on the lathe. It will act as a stop at the bottom.


Cutting tool and stop disc. Will work with the hand drill.



Project folder.

Drawings for the guides shortening and re-cutting for the sealing caps. We try not to leave too many things to chance. The more precise we work the less chance for clearances adding up being too much or too little. Something which the engine builder obviously didn't take into account and I ended up with an engine which would have blown up the first time we would have revved it.


Pilot and stop are set. This is a fixed pilot and the tool revolves around the pilot. Very precise work. Tolerance is 0.01 mm (4/10'000's of an inch. 0.0004")

 

Slow progress is better then no progress! It's never good paying for botched work. Makes you wish you did it yourself!

 

Thanks, LOL, literally true, doing it myself now. Hoping that i'm not messing up.

Two down, six more to go.


Uncut

Cut. Now the caps should fit.

 

Finally head is done. Valve stem caps can be seated, guides are honed to proper clearance. Deck has been cut 0.8 mm (0.03").
Springs had to be replaced as well. That Italian engine builder has put correct springs into the head but they were used. Some had rust on them which at first looked like beige color. The large outer springs had some geometry issues and showed sign of wear. A new set of sportsman springs is 170$.

I hope to be able to post some pictures of the completed head.

 

One year later...

...the Alfa Romeo is running and drivable. Still the interior is missing and a major issue with the transmission shaft to be sorted out. But at least the whole car is together, electrical is fully installed and running, engine assembled and running fine. Carburetors need larger idle jets but a baseline tune is done. Looking for some time available on the lift to get the transmission shaft out. After about 4 times i had that one out I can manage in 1 hour.

some pictures to cover the progress of the last years efforts.

 

Yes!!! I was wondering about this thread not too long ago!

Glad to hear about progress! Looking foward to seeing and hearing more about the journey to get it where it is now...

 

Hey! Good to hear from you about this project! I love to see the work you do.

 

Very short update.

Still sitting in the garage awaiting completion. Last problem that came up was a transfer shaft in bad shape. As I couldn't find a replacement its down to removing all the bolts, boring, making sleeves pressing them back in and balancing the whole assembly.

As I'm in job training at the moment there is no time to dedicate to the Alfa Romeo and neither too much time for the Blazer.

Chevy got a new roof-tent and is still going places. Just went for a 500 km ride (310 mile) trip last weekend, camping.