Fast Fred's Secrets of the OMC MOD50's Thread #1

[Fast Fred]

i don't have an adapter to cut for ya Whitey, wasen't much to it, just decked it from the top, then painted the top with diekem and matched the gasket, then bolt on da pipe.

tryin to get excited about finishin my jalopeey. wrapin up some other stuff i gots on my bench.

on the finger ports for the 56, not too deep.

TOPSPEED RACING TEAM
hey, cool, i'll give ya a bump

[Detroit Whitey]

what do you mean not to deep dont you have to go all the way through the sleave? Like on the 3.3liter blocks they have finger ports in em from bomb and they look like mini intake ports.keep a eye out for a adaptor plate for me

[Fast Fred]

cuttin right through, but not too deep in to the alu.

V8 fingers

[Fast Fred]

well lookin for some one who, would have been assemblin Mod 50 powerHeads at the factory. and what was the Factory spec on the first model on the exhaust bridges, i'm thinkin they brushed them back or maybe not, maybe i'm leanin on it too much
thanks
FF

[Fast Fred]

thinkin that info is lost too time, guess i'll just go with what i know

[NERSTROM]

Early Mod 50's with two port bridges did not have any special honing done to them when produced. Factory (OMC Race Group) modified motors had the bridge ground away from the piston. Not exactely sure what your failures are but piston fit is critical, too tight it sticks & too loose it sticks. If clearance gets over 0.0035 your done. You can expect one of the bridges to crack at some point. Motor will run without one of the bridges so long as what is left is ground to guide rings back into piston.

[Fast Fred]

they got Hot, swelled into the bore, she was guna stick. thinkin i'll bump up the jets.

Quote:
"Factory (OMC Race Group) modified motors had the bridge ground away from the piston."
as a rule, "if you can't oil it, you have to move it out"
that rule has all way kept me from driftin . piston to wall was, is good.

thanks
FF

[Fast Fred]

i have one more Q, on the first carbs for the Mod50, stock jets are .045 lowspeed, 40c highspeed by six, is thare a cut off point on how hard i can Lean on her from there? like no less than say just for sayin .040 on the low and 38c's on the high, bein at sea level

did you try stagered jet setups?

thanks
FFX-61

[Roy Hodges]

Question : what is the difference between a fishing 56 Cube 70 horse omc & the S S T 60 powerheads. i doubt that O M C would have built the sst60 with a fishing 70 horse powerhead. Must have been some differences ? P S : anybody else who KNOWS, feel free to speak up

[Fast Fred]

the head, the carbs, the adapter, the foot, hood and tray, steerin toob.
thats about it, thinkin the case was hand tuned. maked right about 85hp at the shaft.