Fast Fred's OMC Mod 50 secrets Thread #2

[Fast Fred]

it's countersunk, the squish band and the chamber are pushed up in. the stocker head is flat at the squish band, so on the SST head the crown of the piston goes by the head gasket and in to the head, on the stocker,the crown does not pass the deck of the case.

[Powerabout]

Fred


So the sst block has a lower deck height than a stocker?
Can yu make a sst block from from a stocker if you just get the sleves and deck it?
Is the squish band still flat with the piston surface or is it tapered from the outer edge?


Thanks

Powerabout

[Fast Fred]

you can cut the port map of the SST60 into the stock case. a solid mold case is stronger than lost foam. have yet to see a SST head, but i'm thinkin it has a flat or neutral squish band the deck hight is a set spec for the SST, not so much on the stocker, on the stocker the piston can not clear the deck thare is no room for it to do so. the crank spec on the throughs is +/- .011 thou which is a ton.

[Barry Strawn]

http://www.opcrace.com/TECH/60.doc

[Powerabout]

Ive got a 91 70 head off at the moment.
I'll measure it tomorrow.

[Powerabout]

On casting 329835-1
91 or early 92 70

Bowl is the same width at 2.120"

Depth from surface is way up at about 0.620" ( sst .440" min )
Thats a chunk of change
Thats enough to make the area at the thermostat too thin so maybe it is a different casting on the sst
The chamfer into the bowl looks very small on the sst rules drawing and my stock one would look the same if you milled it down that far.

Powerabout

[Fast Fred]

i can't open that doc. any exhaust addapter specs in thare?

the lo speed will influence the total mix, lo speed circuit never stops pullin through the power curve, some lo speed circuits will change from fuel to air with in the power curve.

i gots 3 or a set of 3jet carbs, thay are 1 1/2" carbs.