Thread: Low Vacuum in 390
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11-06-2009 07:39 PM #11
Hworrel, Gee that is bad! So you basically had to rebuild your engine again?.. Well I see what you mean about it sounding lumpy and normal but it was only when you got it on the track it was very noticable! Well, my engine seems to run fine even when I stand on it. It does tend to ping a fair bit when you hold it flat! I havent even had it tuned yet, the rocker arms are rattleing a fair bit too. I do want to get it all adjusted right but there's no point if I have to pull it all down again.
I checked it again today more acuratley and it measured 200. It also was 200at the modualor. Something's got me scatching my head though.. I took off the pcv valve from the base plate of the carby and blocked it and it ran like shit and the manifold vacuum dropped 50???? Is this normal?
I really am having doubts about the timing marks being out only because it really goes well. Heaps of power and it revs out fine and idles nicely. Do you think it could be just a really bad cam, intake manifold, etc combo?..





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A belated Happy 78th Birthday Roger Spears
Belated Happy Birthday