[DN]

Looking for a set to rebuild

 

[cheveslakr]

My rule is pre-'75 either number, check core shift with an intake gasket and watch MJ's video on this. I don't have it handy, maybe someone else will volunteer.

 

[427L88]

I prefer the exaust ports and oil drain backs on the 049s. It looks more like a hi po head from GM. Yet, fully done up with enlarged valve seats and stuff, you wouldnt notice much difference. Like slakr says, its all about the better set of castings, and core shift is a key component of that .

Mark's videos on yourtube are under his channel PERFORMANCE ENGINE BUILDING 201. This is his core selection vid:

I can summarize, bring a exhaust and intake gasket to line up with the cores to see if there is any shift.

OH, and I wasted $150 on 049s off a boat motor. ( unknown to me) The water jackets will never stop corroding . One of Mark's first tips in the video. I used them to practice porting.

 

[jjjaffo]

Looking for a set to rebuild

I don't know if you've had any luck yet, but I happen to have a set of 781s. I live in southern Wisconsin just north of Monroe. Not sure what part of Ill you're from. Just thought I'd throw that out there.

 

[nashville beth]

Mark Jones has lots of good videos. Here is one of my favorites where he talks about how to port these heads :

 

[supersport6667]

Have a set of virgin #781's located in suburbs of Detriot $150

 

[427L88]

Good price. I paid same at Chevellebration many moons ago. Only issue was a helicoil I didnt catch.