@ALB posted:You'll get better bottom end and through midrange power (where you do 99% of your driving) with some properly ported 35x32mm heads- a 1776 doesn't rev high enough with an Engle W110 (even with 1.25 rockers it'll top out at about 6,000 rpm) to make good use of the larger valve heads. If you're insistent on using the bigger heads it will run well enough; the combo just won't be optimal. Lots of people use them on smaller engines and report them running just fine, but a dyno comparison would only show the bigger volume heads to be a benefit in the very highest part of the powerband (last 1,000 or so rpm?). I think the 34 mm vents may be a little on the large side as well; again, for better power and driveability throughout the rpm range 32's might be the better choice.
Hope this helps. Al
If I fly cut the head to get a smaller combustion chamber will these heads work better?