OST-054: 3 rib with snap

[oldeskewltoy]

OST-054's owner is "local" (no shipping). The first head he brought to me, back in early December, had seen an "attempt" at changing the squish pads He had bought the head a few years ago as the one he would build - he wasn't too happy once I showed him the flaw

At this time I'd like to STRONGLY recommend that if you "try" to port a head, and you don't know what you are doing... STOP. In the past 3 years I've bought 3 heads that had to be scrapped because of very poor "attempts"..... that runied the casting If you are going to try... just make sure that head isn't sold on.......


So my client disassembles his engine to get me his current head... and it too has seen a hand inside it. On this one it wasn't "fatal"..... the roof of the port has seen some "work"... along with a lot of "smoothing" inside the exhaust port.




This type of work (tapering port roof) I try to reserve for ITB equipped heads to try and and match the angle of the ITB adapter. In this case some care was used by the previous "porter" so that this head could be re-used.

disassembled, prior to cleaning





This head has been machined once as well




more to come....

[kazi]

what should the head size be if it hasn't been machined before?

[oldeskewltoy]

(01-11-2019 07:00 PM)kazi Wrote:  what should the head size be if it hasn't been machined before?

116mm


work begins..... #4 on the left...




Oh... as the title states... this is a 3 rib, and my client manage to find a set of high comp TVIS pistons 13103-16030, the same pistons I used in OST-050.



His short block is being built at a local machine shop - with my technical assistance.


more to come.....

[oldeskewltoy]

oldeskewltoy Wrote:work begins..... #4 on the left...

from another forum Wrote:Short turns look beautiful.

and #3 and #2




more to come.....

[oldeskewltoy]

Intake side finished... on to the exhaust side and the chambers....


more to come....

[oldeskewltoy]

oldeskewltoy Wrote:on to the exhaust side

3 down so far.....




more to come....

[oldeskewltoy]

oldeskewltoy Wrote:3 down so far.....

and now the exhaust side is done.....






and from a slightly different perspective...






Next is getting the chambers deshrouded.....




more to come.....

[Bean]

Not sure if I didn't pay enough attention the last many times or did you get a lot faster?

Sent from my MHA-L29 using Tapatalk

[oldeskewltoy]

(01-18-2019 08:06 PM)Bean Wrote:  Not sure if I didn't pay enough attention the last many times or did you get a lot faster?

Sent from my MHA-L29 using Tapatalk

not really faster.... In this case I waited till I got the head back from the machine shop after cleaning to begin posting.

oldeskewltoy Wrote:Next is getting the chambers deshrouded.....

simple progression photo....





and a little before and after before it gets its 3 angle




more to come...

[oldeskewltoy]

the head is back... briefly... so I can check and set chamber volumes....



Now it is back @ the machine shop about to get .016" taken off to set the chamber volumes @ 35cc. A 35cc chamber, along with the proper squish should net my client a static compression ratio of about 11.0:1.


Mix in a set of Cat cams 252/222 8.5mm lift cams, and this engine should pull (make power) to low/mid 8000s


more to come.....