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gvw5400 · 11-02-2013, 02:46 PM

You walk a fine line with the 10:1 comp and going to a "RV" style cam. The shorter duration can cause your dynamic compression ratio to go way up. This can end up being an engine that you have to pull timing out of. Something to ponder is all RVs and heavy duty truck gas engines came with 8:1 to 8.5:1 comp when built. I have a 408 BBC with 9.375:1 CR and a stock truck cam. I have to run prem. fuel to make it run right.
All the best Dirk

11-02-2013, 02:46 PM	#27
gvw5400 Registered User Join Date: May 2013 Location: Colorado Rocky Mountains Posts: 263	Re: Not sure what to do You walk a fine line with the 10:1 comp and going to a "RV" style cam. The shorter duration can cause your dynamic compression ratio to go way up. This can end up being an engine that you have to pull timing out of. Something to ponder is all RVs and heavy duty truck gas engines came with 8:1 to 8.5:1 comp when built. I have a 408 BBC with 9.375:1 CR and a stock truck cam. I have to run prem. fuel to make it run right. All the best Dirk