I just listed a nice one on ebay tonight!
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=250730599529&viewitem=&sspagename=STRK%3AMESELX%3AIT
That's the million question, I don't know the history of the heads. They were a finished set, that I ended up with in a trade. I didn't cc them before I bolted them on?? Could be, that was my 1st thought! I have a set of .020 rocker shafts spacers, I'll give them a try just to see what happens.
Try changing out the secondary vacuum spring, Holley makes a spring kit for tuning the timing of the secondary. While your at it get the quick change top cover, it makes it easier to swap springs. If it has the bare color (Factory) spring it now, it will open really slow, and maybe not fully...
Yeah, thats exactly what I thought also, 18 is a lot, but I degreed the cam, and checked the balancer for TDC, when I assemble the motor. Also swapped dist. when I was trouble shooting. It seems that this a common problem, because of the other posts that I've seen??? I would have never thought...
The 318, 340 and 360 OEM car oil pans have the same sump location, if the 318 clears then the 360 will also. I have a 70 Duster that had a /6 now has a 360, still has /6 K frame, I used Schumacher mounts, fits perfect, headers clear, ect.
I found some others on this site that were having the same problems. Their solution also fixed my problem, a lot of initial timing. It is a fresh rebuild 360, and its been a long time since I built a stock cam motor (340 cam specs). The problem I was having seemed like a valve train problem, or...
1971-1973 360 blocks can go .060 over, I have a 72 block that's .060 over. If it's not a 71-73 block, try looking for a 87-90 360 truck motor, they have a roller cam, and oil through the head. Good Luck!
I have the same problem on my 360 (70 Duster), the pulleys are the problem on mine. I changed from a underdrive crank pulley to a OEM 6 1/2" od, and it helped alot, but didn't completely solve the problem. The combo that I'm using now still isn't correct, because the crank pullley (6 1/2")...
Babyblue66 is correct, I thinking that a 509 was a mech cam. The mech cam push rod length is 7.342, and the Hyd ball and cup is 7.234 in.
Summit part number (set): sum-G6420 7.234
Melling part number (ea): MPR-157 7.234
I have set in my .528 MP solid lifter cam, 360 Dart Sport. If you have the correct ball and cup style push rods that came with the rocker arms that's all you need. Just make sure you mount the shaft's so that the oil holes for the rocker arms are in the correct postion. I turn 6500RPM's, and...