engine and drivetrain No top end--what's that indicate?

[norma]

My 67 1602 has no top end. When I hit any fairly steep hill it starts chugging. I know the engine needs an overhaul and it's only 96HP, but to squeeze more from the engine, what can I get to help? Better crank and bigger pistons? It's pretty gutless over 60 or so right now. Or should the overhaul do the trick and forget the goodies? Thanks.

[c.d.iesel]

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. . . . ignition timing

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. . . . pedal making full throttle opening at the carb?

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. . . . secondary really opening up ?

[TobyB]

fuel delivery-

screen, filter, screen, pump, so on...

and do you downshift? A 1600 really wants to be turning 3500+

t

[norma]

Toby,

Yes I downshift. I'll check the fuel system and carb. Thanks. What about goodies to squeeze out more power? Or should I leave it alone?