Knurled guides do not last long, maybe 20K-25k miles. If I were to get the 049's, I'd have new guides installed before use. Then the price would be about the same, less parts in the 049's. So the 781's would be the better deal.The 049's have not really been ported to say but have been smoothed out. They are knurled. They are bare heads for $100. I have rockers, studs and such to use on them if I go this route.
The 781's have been "rebuilt" by Pioneer. They have 5000 miles on them and look almost new. I'll have to check on nurling. I can get them for $250. What do you think?
I don't mean to step on any toes, but I've seen numbers ranging from 110ccs to 120ccs for 049 and 781 heads- many from reputable sources. The answer is that you must cc your own heads and go from there...zdld17
So Mortec is correct? Or did you get this info from Mortec? I have seen conflicting numbers on other sites. Hopefully they are correct. It can make a big difference when building an engine and calculating compression. This is exactly the kind of info I am looking for.