Reply to "351C typical vacuum readings"

OK guys,

Thanks for the information and a few things to go at. Indeed we did get a backfire through the carb, so will investigate this and the power valve (probably swap out for a new one to start with). I clamped off the brake servo and it had no effect unfortunately.

I think there may be a point about the cam in that with the characteristics it has, it may be part of the reason but will see if I can do the timing and set up as mentioned above (the 600 has only 2 idle screws on the primaries, so only a two corner tune capability. I would not mind a read through the relevant paragraphs to see if it is the way I do things! The timing is set at 15 degrees initial with my new Petronix distributor, but would have to look to a specialist to get the curve changed (maybe to 38 degrees all in at about 2800rpm?). As mentioned, I am not running the vacuum advance as yet.

I have now used two different vacuum gauges and taken of the ported vacuum on the carb and also the ports on the intake manifold - both read the same.

I will keep trying and hopefully I can get to the 14 psi (g) soon...

Regards

Adrian