Re: My 1968 C-20 Golden Anniversary Project
 

Valve head 2.02 " and 1.60"
Preparation for measurment chamber volume.

Re: My 1968 C-20 Golden Anniversary Project
 

Forget to screw in the spark plug = Leak & again
Chamber volume 63 cc
Intake runner 164 cc
Exhaust runner 52 cc

Small block 64cc: Amount to reduce chamber volume by 1 cc (milling): 0.0055"
Remember: In the outer area cylinder heads up to 0.3 mm (0.011811") removed, means more or less matching.

Re: My 1968 C-20 Golden Anniversary Project
 

So next steps:
1) Evidence for thread temperature sending unit in cylinder head driver side: NPTF 1/2 x 14. Remember NPTF is similiar to NPT but not identically.
2) Thinking on tomorrow: Piston stop tool already bought.

Re: My 1968 C-20 Golden Anniversary Project
 

Load test on the rocker stud threads: 60 ft-lbs (without oil, sealer or antisizing)- ok and ready for go (production is 50 ft-lbs). Nut: deep-well wrench 11/16".
Rocker studs are 3/8 fine thread x 7/16" course thread, length overall 2.475".
Earlier pressure test done and investigation: no guide plates needed (as in the original engine in my car).

Re: My 1968 C-20 Golden Anniversary Project
 

To measure the gap of the valve guides is not so easy for beginners. In my opinion you need a couple of hours to get a feeling what can be true and what not.
First cleaning of the guides. I used two measurement tools. First digital inside calipper. You have 5 digits thats could be a litte bit confusing because even if you make the identically measurement twice, you dont get the same last digit.
But on the end is easier than expected.
Let say a new valve has 0.341" shaft diameter (and this is over the complete shaft lenght. Than the maximum stem clearance can be inlet 0.0027" + 0.001" and exhaust 0.0027" +0.002". So that means the guide must be less than 0.3447" inlet and 0.3457" outlet. In practice I was measure all inlets and exhausts and was looking that I have no 0.35" at all. I get all guides below the limit. Than I asked an expert, he don't measured the system, only moved a new valve in the guides and told me: "Good for go"! Guide job will only burn additional money and is not necessary yet.

Second I used an inside feeler and micro, was also very suitable and delivered the same results.

Further I measured a brand new bronze insert: 0.342, ok bether than my existing with 0.344 but will do without guide job.

Re: My 1968 C-20 Golden Anniversary Project
 

Last for today: Looking for warped heads, but the heads are already resurfaced:
By the way my orientation is a good book: "How to rebuild your Small-Block.CHEVY by David Vizard". Example given, there you will find that the limit of warpage schould be 0.003" (a compound gasket will take up far more warpage up to 0.005" according David.
Result: Less than 0.0025"

Monday shopping:
16 pcs Rocker stud (because I lend)
16 pcs Rocker arm
16 pcs Ball seat (Pivot ball)
16 pcs Rocker clearance adjusting nut
08 pcs Inlet Valves
08 pcs Outlet Valves
16 pcs Valve Springs (use always new one)
16 pcs Valve spring retainer (I got already with the heads)
32 pcs Keeper (use always new one)
16 pcs Oil seal

To fire on the 50 years old short block:
01 pc Oil pump
01 pc Oil pump securing bolt
01 pc Oil pump pickup pipe
01 pc Oil pump drive shaft
01 pc Oil pump drive shaft adapter
01 pc Oil pan
01 pc Oil pan gasket
14 pcs Oil pan bolts (small) (1/4"-20UNC x 1/2"long)
01 pc Oil pressure switch
10 ltr. Breake in oil
04 pcs oil pan bolts (large) (5/16"-18UNC x5/8" long)
14 pcs oil pan bolts star washer (1/4" diameter)
01 pc Oil filter pressure relief valve housing
02 pc oil filter pressure relief valve housing bolts
01 pc Oil filter spin on cartridge

01 scew set small block
01 gasket set small block

Re: My 1968 C-20 Golden Anniversary Project
 

And preparation for the new valves:
looking for stock similiar but stainless steel.

At the moment I believe that the contact area (Seat width) shut be:

.060 to .080 inch for the exhaust and .040 inch for the inlet. (Exhaust must transpoprt more head)
.060 to .080 inch = 1.524-2.032 mm = 1.5-2 mm
.040 inch = 1.016 mm = 1 mm

Apply the paste to 3-4 points on the underside of the valve.
Rotate the valve in the seating with the valve grinding tool, lifting occasionally.
You can tread the paste with a litte bit oil.
Good cleaning after is mandatory.

Re: My 1968 C-20 Golden Anniversary Project
 

Your going to have a nice set of heads

Re: My 1968 C-20 Golden Anniversary Project
 

German engineering - love it!

Re: My 1968 C-20 Golden Anniversary Project
 

:ack:Width of valve seats are to big 0.125" = 3.175 mm That means:
VALVE SEAT JOB BY MACHINE SHOP
Heads are already there.

In the meantime two other side jobs:
Left door glas is shaking.
Railing is rusty.

Re: My 1968 C-20 Golden Anniversary Project
 

:-)
White side covers produced by SMS Auto Fabrics.
Tool for removing the securing brackets door handle.

Re: My 1968 C-20 Golden Anniversary Project
 

:-) Little bit rusty but below strong american steel. I'm happy.

Several paints and rost lockers are not allowed in Germany by law, therefore my favorite:

1. Owatrol oil (Rost stopper)
2. Brantho Korrux nitrofest (under coat)
3. Sealer Korroflex
4. Minimum 2 layers Brantho Korrux nitrofest
5. Alkydharzlack (Alkyd resin varnish)
6. Klarlack (clear varnish)

In the last picture Owatrol already done.

Re: My 1968 C-20 Golden Anniversary Project
 

Next layer done.

Re: My 1968 C-20 Golden Anniversary Project
 

Wow Gerhard! You've been working hard at it! Looks fantastic my friend.:metal::chevy:

Re: My 1968 C-20 Golden Anniversary Project
 

Hi my Friend, thank you for the compliment. On the end it is heavier than expected. It was my first paint job and the roof railing and pillars are the most complicated places I think. As the spray can for the under coat was empty I used a paint roller- THAT WAS A HUGHE FAILURE! The surface is than not smooth enough for the final coating. I was removing everything again by grinding. A couple of days. But now it comes to an aceptable surface.

Have seen your project has done a great step forward too and your shop -GREAT!!!

Re: My 1968 C-20 Golden Anniversary Project
 

Ready for final Cameo white, already tested on one place.

Re: My 1968 C-20 Golden Anniversary Project
 

Looking good, don't forget to post a picture after paint.

Re: My 1968 C-20 Golden Anniversary Project
 

Clear vanish added, paint preparation (taping) was not precise enough- that means time saved on the beginning and lost by factor 3 on the end, a lot of work. Will do more accurate next time.

For spray and first job the result looks good.

Color is 526 Ivory (also of-white and Cameo white)

Re: My 1968 C-20 Golden Anniversary Project
 

Was starting to make some measurements on my motor, found out that I need a gauge with thread not rubber as it is not enough comfortable for me.
Spark plug #4 is oily, all others good bud maybe a little bit to lean (more white than brown color).
GAP is 0.035".
Compression between 11-13 bar, but measurment will be done again with different gauge (with thread).

Re: My 1968 C-20 Golden Anniversary Project
 

The hard work of preparation has paid off. Congratulations on a job well done! The roof paint really looks great.

Re: My 1968 C-20 Golden Anniversary Project
 

Some small issues during removing of the old hard tape, next time I will remove it in intermediate steps, but in general not bad for the first time.

Re: My 1968 C-20 Golden Anniversary Project
 

Looks good

Re: My 1968 C-20 Golden Anniversary Project
 

Hey Gerhard!!! Glad to see you getting some time to work on your truck after floating in the ocean for so long. Long live live old Chevys!

Re: My 1968 C-20 Golden Anniversary Project
 

Yeaaaah and Chris Stapleton.

Re: My 1968 C-20 Golden Anniversary Project
 

You take it to the car wash?.....they would laugh at me if I did that to Blue. I did follow your lead. The spotlight is installed.

Re: My 1968 C-20 Golden Anniversary Project
 

One more pic.....ok two pics

Re: My 1968 C-20 Golden Anniversary Project
 

Great man, looks perfect.

Regarding car wash is a fake
I washed by myself, but took a picture from a big truck wash advertisement.

Re: My 1968 C-20 Golden Anniversary Project
 

Ahhhhhh, I feel better now....

Re: My 1968 C-20 Golden Anniversary Project
 

After weeks of waiting I got today the beezel from Brent- Thanks man, perfect quality. Its a honor to have the beezel for me!
See the pictures: 20 EUR add. customs fee and nearly paperless handling :-)

Re: My 1968 C-20 Golden Anniversary Project
 

20 EUR for customs?! Wow!

Re: My 1968 C-20 Golden Anniversary Project
 

Nice!!!

Re: My 1968 C-20 Golden Anniversary Project
 

Today arrived the air cleaner housing from classic industries. Not bad for a replica, I guess.

Re: My 1968 C-20 Golden Anniversary Project
 

The new cleaner looks very nice. Was the something wrong with the old one?

Re: My 1968 C-20 Golden Anniversary Project
 

Looks good, for repop....lol

Re: My 1968 C-20 Golden Anniversary Project
 

No but I would like to build an copy of my engine. Is just for fun and as living spare shelve. See #49 too.

Re: My 1968 C-20 Golden Anniversary Project
 

What a great pleasure, today arrived my new cluster and accesorries, Im really happy, This is a so great product and everything assembled with great care for details. Is like christmas.

Good toys for winter works.

110 EUR customs :-(

Re: My 1968 C-20 Golden Anniversary Project
 

Was thinking good to have a bore caliber for valve seats.

Good :8.70 mm (0.34252 ")
Bad: 8.72-8.73 mm (0.34331-0.34370 ")

Asked my old father and he produced for me. Probably the last mechanical work in his live, my most important memento.

Re: My 1968 C-20 Golden Anniversary Project
 

Cluster choke delete bezel added- awesome.

Re: My 1968 C-20 Golden Anniversary Project
 

Did you learn your machining skills from your father? That would definitely be a special piece to have something handmade. The chrome on the GM logo looks incredible Gerhard!:metal::chevy:

Re: My 1968 C-20 Golden Anniversary Project
 

just middling :smoke: