Quote:
Originally Posted by Jay S
The last 60919 I did was a pretty aggressive profile (285/294 at .006), and I am confident it would idle a little better than a Lunati 704 on 110... but I can not totally say for sure. Lol....becuase I had another 60919 that had 308* at .006 tappet on ALL the exhaust lobes. I assume there may be more 60919s like that one out in circulation. That bigger profile is one I would want Rhoads on it, the next one didn’t need them and we run them tightened down so the Rhoad’s don’t do much of anything.
I think the current 60919 is a little different than it was in the past. Where it was 113 LSA and a 109 ICL and more seat timing I believe it is currently set on a 112 LSA with a 108 ICl. The 60919 seem like it has more aggressive ramps now also, or maybe it doesn’t  ....The 60919s last couple years the cam card said 112 LSA and 109 ICL. Steve C posted a link to the cam card not to long ago and it had 112 LSA and a 108 ICl, so it appears it had another change, at least on paper. The current cam card also had some wacky 150 lbs seat pressure and 350 nose pressure requirement. That last cam card change was it for me. My luck I want the long seat timing to help manage compression some and I get the aggressive one, or try to use it in a 400 thinking it is the aggressive version and it is the lazy version. Lol
704 on a 110 has 65.5* of overlap at .006” tappet and still has 17* by .050 tappet.
The last 60919 I had thru here had 67* at .006” tappet and has 11.5* at .050.
The 704 is roughly 4* longer on the closing side than the opening side on both intake and exhaust from .050” to .006” tappet. That changes the looks of the cam card seat events a fair amount. The 17* is a good amount of overlap at .050”, gives it the rougher idle. |
Wow, lots of great info, thanks! I'm starting to maybe lean a little towards the 704 on a 112 seperation for this engine, but then you read stuff from Paul Carter saying that in a 455-467 engine, the 704 doesn't need the 112 Seperation, due to the lobe design and offset, unless you want to make power over 6000 rpm, which is not the case here. I even read a post from him saying that he installed the 704 for a couple in their 70's, because the previous camshaft was to big for their likeing, and they loved the result of the 704 in their 455, so that leads one to believe that it must not have too bad manners. It takes alot of thought and reading to decide on a camshaft for a particular application, but its alot of fun reading for sure!! Lol