Valve overlap

west coast · 01-25-2017, 11:59 AM

So it looks like there is no real standard of what lift you should measure valve overlap. Since i have a comp cam i will kind of fallow them. It sounds like you should use the numbers for tappet lift done during advertised duration which is .006. i found the web page that had the formula's that John Dinkel posted on here which work if your cam card reads valve timing at advertised duration which mine doesn't it is at .050. So now on to understanding all the theory's behind all of this.

Dale hope my costly mistake will save you money. Its hard to explain the problem but a picture is worth a thousand words that will leave you speechless sometimes.

01-25-2017, 11:59 AM	#5
west coast Senior Member Join Date: Dec 2008 Location: Rainy Washington Posts: 609 Likes: 12 Liked 223 Times in 73 Posts	Re: Valve overlap So it looks like there is no real standard of what lift you should measure valve overlap. Since i have a comp cam i will kind of fallow them. It sounds like you should use the numbers for tappet lift done during advertised duration which is .006. i found the web page that had the formula's that John Dinkel posted on here which work if your cam card reads valve timing at advertised duration which mine doesn't it is at .050. So now on to understanding all the theory's behind all of this. Dale hope my costly mistake will save you money. Its hard to explain the problem but a picture is worth a thousand words that will leave you speechless sometimes. __________________ James Boyce 6052 K/SA Stock National record holder 2015,2018,2 times in 2022,2023