OST-064: Breathing on a 3 rib

[oldeskewltoy]

more to come.....

[oldeskewltoy]

OST-064 "Cleaned"....





After getting it cleaned, I deburred the casting




And then before porting, I had it "tumbled" so the head now looks new, no discoloration do to oils, carbon, or coolants.






more to come......

[oldeskewltoy]

Work begins.... One done...












and a bit closer...





more to come....

[oldeskewltoy]

more to come....

2 down....




more to come.........

[aukword1]

Great work as always! Quick question though, what does "tumbling" the head consist of? Is it similar to tumbling bullet casings?

[oldeskewltoy]

what does "tumbling" the head consist of? Is it similar to tumbling bullet casings?

Not sure (tumbling bullet casings...???) What "tumbling" means in this case is they have a large tool - it consists of a large cabinet, with a rotisserie that you strap the head too. The cabinet is closet, and it tumbles inside the cabinet. The media used is cast zinc shot.


a bit further yesterday..... 3 down....





and an up close view inside on the exhaust side....




more to come.....

[aukword1]

Ah, thanks for the clarification. It's actually very similar to tumbling bullet casings for reloading ammunition except its a different type of media used. Very cool!

[oldeskewltoy]

4 down....




more to come.....

[oldeskewltoy]

and the internals.......





crank on right has wankered key groove in snout




more to come.....

[oldeskewltoy]

everything is back in my hands for final assembly....

head, with fresh valve job (machined .008")...




along with assembled short block - those are Molnar Tech 40/20 H- beam rods



Does anyone see the remnants of a problem in the deck???

It took a great deal of decking to get the block suitable to accept a metal gasket.... so much so that our deck is now .018" (piston above the deck!)



The "fix", Cometic C4166-051, that should set the squish back to .033", or just a tick above .8mm.......


More to come.....

[oldeskewltoy]

[QUOTE=oldeskewltoy;1110545]
along with assembled short block - those are Molnar Tech 40/20 H- beam rods




More to come..... [/QUOTE]

Did(Do) you see it????

How about if I point it out.......



A little extra clearance at the bottom of the bores to make sure the new rods clear during rotation


As often happens when you mix valves from one head, with a different head... and new cams......



Getting the valves tipped so that they are in the middle of my shim bank sizes so I can set valve clearance to the thousandth(.001")


more to come......

[oldeskewltoy]

along with assembled short block - those are Molnar Tech 40/20 H- beam rods




More to come.....

Did(Do) you see it????

How about if I point it out.......



A little extra clearance at the bottom of the bores to make sure the new rods clear during rotation


As often happens when you mix valves from one head, with a different head... and new cams......



Getting the valves tipped so that they are in the middle of my shim bank sizes so I can set valve clearance to the thousandth(.001")


more to come......

[oldeskewltoy]

a nice 3 angle valve job... and back cut intake valve......




more to come...

[Rogue-AE95]

I didn't realize those Molnar 40-20 rods required modifying the block. I had bought a set years ago from Orion, but I never used them.

[oldeskewltoy]

I didn't realize those Molnar 40-20 rods required modifying the block. I had bought a set years ago from Orion, but I never used them.

Not always... Loynings made clearance before.... as that is easier then finding out during assembly



fresh hone....




and with the Cometic gasket fitted... NOTE: the front, and rear placement for the oil feed(front), and oil drain (rear)




and with the head fitted




more to come....

[oldeskewltoy]

A step further....




Doing a bit of custom fitting... the stock lower timing cover will not accommodate the T3 pulley snout (its broader - more diameter than stock), so the lower timing cover is "adjusted" so it will accommodate the T3 pulley






Once that detail is taken care of, the rest of assembly goes smoothly

[allencr]

Big chamfer, still need a ring compressor?
Thanks, beautiful pics.

[allencr]

Big chamfer, still need a ring compressor?
Thanks, beautiful work & pics.