Description:

I have 2 LT4 knock modules p/n 16214681 that I found in my TunerCat LT1 tuning bag.   Left over from Impala club days where we'd put these in to extend timing a bit more for the LT1s in these b-bodies..  If I recall correctly the original application was for an LT4 Corvette, which had a bit noisier.valvetrain. 

One is in an AC Delco box, the other is not.  

$350 for both modules, $175 each.  Will ship via USPS Priority mail.   

I'm in Suffolk, VA so local pickup could work too.   

Gerry-