rmaynard 15,509 #1 Posted July 15, 2022 Can it be done? I have a K161 with the timing advance cam. I also have available to me a K181 cam with ACR. Can I swap the ACR cam into my K161? Share this post Link to post Share on other sites
Handy Don 12,235 #2 Posted July 15, 2022 Curious and following! 1 Share this post Link to post Share on other sites
953 nut 55,296 #3 Posted July 15, 2022 The short answer is YES. Mike @squonk posted a thread here on the subject. 2 Share this post Link to post Share on other sites
squonk 41,149 #4 Posted July 15, 2022 You need to use the tappets from the ACR cam as well. Different lengths. Also you may need a different cam shim for the endplay. 2 1 Share this post Link to post Share on other sites
rmaynard 15,509 #5 Posted July 15, 2022 (edited) Okay. Thanks for that info Mike. I have the tappets and I have extra shims. As soon as I get the block back from the machine shop, I will play around with it. More to follow... Edited July 15, 2022 by rmaynard 2 Share this post Link to post Share on other sites
squonk 41,149 #6 Posted July 15, 2022 Exhaust tappet for ACR cam is 2.02" Spark advance 1.964" Cam end play .005"-.010" 1 1 Share this post Link to post Share on other sites
rmaynard 15,509 #7 Posted July 15, 2022 2 hours ago, squonk said: Exhaust tappet for ACR cam is 2.02" So what you are saying is that I might have to mill a little off the bottom of the exhaust stem to get the correct clearance. Share this post Link to post Share on other sites
rmaynard 15,509 #9 Posted July 15, 2022 (edited) 6 hours ago, squonk said: Exhaust tappet for ACR cam is 2.02" Spark advance 1.964 Hahaha 😂 Apparently I marked the tappets wrong when I removed them from the K181 over 5 years ago. Edited July 15, 2022 by rmaynard 1 Share this post Link to post Share on other sites
rmaynard 15,509 #10 Posted July 22, 2022 On 7/15/2022 at 7:30 AM, squonk said: Exhaust tappet for ACR cam is 2.02" Spark advance 1.964" Cam end play .005"-.010" Actually Mike, it's not. As I showed in the picture below, which I thought was marked wrong, the intake tappet is longer than the exhaust. 62 When I installed the 2.044" tappet in the exhaust location, it stuck up way too high. So I replaced it with the 1.974" tappet and clearly it was the correct one for the exhaust. And to make me even more nutz, it was way too long for the intake as well. I didn't check the K181 to see if anything was different. So I ended up with the 1.974" in the exhaust, and a 1.962" from the K161 in the instake. I still had to grind the valve stems for both. Now, for the life of me, I don't see any difference between the exhaust tappets other than 0.012" in length. Anyway, the tappets are installed, and the ACR cam is installed as shown ACR functions correctly, and my specs are as follows: Tappet clearance: .006 intake, .017 exhaust Valve lift: .308 intake, .311 exhaust So if anyone can tell me if I did anything wrong, let me have it. Share this post Link to post Share on other sites
squonk 41,149 #11 Posted July 22, 2022 I got my info from @richmondred01 Share this post Link to post Share on other sites
