Help starting. SU carbs on V8

its not the needle , whats happening is that one of the carbs is probably flooding and the fuel is over richening the inlet manifold , which is called a rich cut , as used in aviation circles . You can get the same effect by pulling the ckoke out on a fully warmed up engine , to much fuel for the correct air/fuel ratio. Try feeding one carb at a time with fuel , this will allow the engine to run , and then you can sort out the faulty carb HTSH

Not worth a rebuild kit on cabs anyway?

mordzy said:

Took carbs off and stripped. Needles warn etc.

Checked model number with SU and they are for a 3.5. I have a 3.9 block.

Would you guys say they ate ok or should I look at an after market carb? Probably best posting this in another thread

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Needles probably been changed for the 3.9, jets would stay the same. worn needles would overfuel any way to feed 3.9 so I woildn't worry.
take faulty carb off and take bottom off and check float and fuel shut off valve, might just be furred up or sticky, not a hard job

I spoke to the guy I bought it off. He says he got the carbs off of a mate. The block is out of a efi RRC so entire setup for carbs could be wrong. Anyone know what part number is for 3.9 needles, I dont want to order what's in as it's likely wrong.

Sorry for delayed reply. Had to spend some time with the wife ;-)