harley-davidson twin cam cnc ported heads

To bad bike got written off !! I was lucky got to pull all my engine stuff off and will repeat the build on my new bike with a little less compression this time I think As for the CNC ported heads they worked well.for me depends what you want if your chasing low down torque just use the stock heads I flowed mine before buying the CNC ported heads the port shape and size wasn't the restriction the valve size was. Camshaft operation was relatively quite but I did have some issues with pinking at 4 to 5000 rpm which caused me to dial out some ignition at this rpm with my thundermax all was then good. I found the bike didn't loose any bottom end torque was very smooth down low but once you got to 4500 rpm it just pulled your arms out of your sockets right through to the rev limiter which was set to 7000 rpm. I bored it out to 103 and fitted se forged 10.5 1 pistons then shaved 35 '' off the barrels to tighten up squish. Just a little recent experience that I thought you may find interesting.įitted those heads to my 2008 fatboy. They are not a noisy cam at all, and there is good seat pressure there as well. I am thinking compression releases are a good idea, though, as I mentioned, his bike actually starts quite ok. I would previously have thought 255 would not be all that impressive, but they really can be. Much lighter bike though, and a solo as well. Mind you, I have 54H cams in the shed, ready for my dyna.

The quality seems good, and they fit well. To be fair, as time has gone by, I have become more and more of a gen HD parts fan. We offer three levels of CNC porting service for Twin Cam Heads: The Impact service treats your heads to our exclusive and proven 4-Axis CNC port treatment, followed by hand finishing, bronze manganese valve guides, a custom radius valve job, sizing of the chambers to achieve your desired compression ratio, and decking your heads to get a. If new HD performed like it does, they would sell double. It really does have power right where it is needed.Īnd it goes to over 5 before it really drops off. It starts well(though it cranks 200), due to the -4 gear, and that helps it not run out of puff embarrassingly low. But the point is, he has 118 ft lbs of torque, at around early 4's. I did grind on the heads, and I have done a fair bit of that as well. Recently, a good friend of mine had a little misfortune (engine wise), so I made it a 103(it was an 88) with 255 cams (cast flat tops, 50 mm SE, 1.9 in, 1.63 ex) The 255 cams do cop a lot of bashing, but if you use a -4 gear, it helps a lot. You probably would (may well) spend most of the time in the up to 4500 rpm area. It is a 'heavy' bike.(given hd classifications)

Harley-davidson twin cam cnc ported heads