Fast Fred's OMC Mod 50 secrets Thread #2

[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.

[Fast Fred]

(except the odd carb... all black),

this is killin your set up, she needs all three to hit the same.

[Fast Fred]

thanks David_L6, the tuna specs change for the SLT, but thats cool, guna take some measurements, i don't want to short change it out of any drive shaft

[Roy Hodges]

[QUOTE=Fast Fred;74637]thanks David_L6, the tuna specs change for the SLT, but thats cool, guna take some measurements, i don't want to short change it out of any drive shaft:cool............................................. .................................................. ..................
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EEK; - Cool ? It's frigid , man . I don't no wot to dew- My 1975 short shaft HUSTLER don't have a "TUNA" . I think it's got a mackerel or maybe a sea bass in it . SEW , wot i do, huh ?

[850cc racer]

ookay some help please people! this head good or bad to run with a set of mcdaniels pistons.. it had a set of dome tops in it before...

[Fast Fred]

it will work.

[850cc racer]

my dad reckons i should run a stock head as this will lower the compression too much due to the dish in it?

[Fast Fred]

your Dad is right, but if you deck it flat and use it, it will bring the comp up, and have a nice angle between the squish and the chamber.

[Fast Fred]

check your deck hight. if the head is not countersunk like that one, the pistons crowns need to stay even with the deck, the thickness of the crushed head gasket is the only clearance which is about .030 thou