- Local time
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- Joined
- Apr 13, 2012
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- 35,601
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- Location
- Granite Bay CA
I had the Mopar Performance 292/509 at first. I tried adding 1.6 ratio rocker arms but that only resulted in evening out the cranking compression numbers. The stock 1.5 ratio arms must have had some variance in lift because the 1.6 rockers raised some cylinder numbers and lowered a couple. My averages were still around 180.I am curious what 2 cams you tried at 10.9:1. I assume you have aluminum heads and what elevation your at.
Second cam was the Lunati solid 316/326:
A pretty racy cam but it didn't help stop the knock.
The same FABO member that suggested it also suggested that I look at the distributor and find a way to S L O W the rate of advance. I have noticed that many guys report that they have, say...36 degrees of total advance all in at 2000 rpms. I wonder why ALL the advance has to be in place at such a low rpm? The FABO guy was onto something with that advice.
If full advance can be delayed until 3000 rpms or so, maybe whatever tendency there is to knock may be diminished ?
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