False knock? I would try a new OEM knock sensor torqued to the OEM value.
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what octane fuel do you run? i run 93 on the stock cam and 195* thermostat and all the engine mods(headers, afpr and whatnot) with top rpm/map spark at 29 and no knock. is something rattling around down there causing false knock?
oops, didnt see fast355's post on page two. he already asked about the false knock
I fitted a new AC-Delco Knock sensor and torqued it into place when I put the new Vortec engine into the van.
It could be false knock but if it is I don't know how to eliminate it.
It could be noise from my narrow body ComCams roller rockers or it could be the aggressive lobes on the cam as there is a bit of lifter noise that I can't adjust out at idle.
I use 98 octane fuel in it.
I had the brand new Vortec crate engine pulled apart and zero decked and I've now got 9.6-1 compression ratio, it could be that my cam is too small CS 252XFI HR-13 has 202º intake and 212º exhaust at .050 and I've got too much cylinder pressure.
The combo makes more power than the stock TBI motor did and it idles with 18" of vacuum @ 600RPM in gear but I can't get it to break traction if I stand on it.