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#21 (permalink)

05-12-2012, 02:57 PM

Gaz64

CC Member

Join Date: May 2008

Location: Brisbane, QLD

Cobra Make, Engine:

Posts: 2,797

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Quote:

Originally Posted by TonyLoz

I finally got out to my garage last night wth my float gauges from Gene Berg. All four carbs where set quite high. What a difference... The idle changed from about 900 RPM to 1300 RPM and the engine behaved very well around town. Now I have stumbles at higher RPM. I starts to act up around 3500 RPM and seems to carry on up to 5000 RPM where I shift. Its a new motor so I havent been running it up to 6000RPM (yet). I am thinking a main jet change may fix this??

Gaining on it

Tony Loz

Tony,

I'd up the venturi size first, 37 is a bit small for a 408, you need at least 40mm.

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Gary

Gold Certified Holden Technician

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