I dont agree at all.If you buy AFR, buy bare castings so you can put good valves and springs in them because the ones they come with aren't very good. If you're going to spend that kind of money, the TW is much more capable. If you are looking at AFR 165s, I'd just recommend getting GT40s. You wont see much power difference, an the GT40s are much cheaper.
That TW 170 will be a good head, I haven't used them but looking closer its very close to the AFR 165 in flow, and with the 170 cc intake port it will have good movementI greatly appreciate the debate folks. I did a ton of reading all over the internet last night. I keep coming back to the TW170s, but the version with the CNC'd combustion chamber (as compared to their fast as cast version). Honestly, I'm sure I'd be happy with the AFR165's as well, but the TW170s seem to offer just a bit more room for anything I might do in the future...though I don't plan on anything (he says as he looks at the pile of parts in the corner). Based purely on my readings the GT40s aren't an option.
So now...do I get the 58cc or 61cc size? I'm trying to understand the nuances here, so doesn't this affect my compression?
Link to the 58cc: http://www.trickflow.com/partdetail.asp?part=TFS-51410002-M58&autoview=sku
Link to the 61cc: http://www.trickflow.com/partdetail.asp?part=TFS-51410002-M61&autoview=sku
Do you see any issues in the specs I should be aware of?
Oh, I finally found a previous thread with my engine info...minus the type of piston unfortunately.
Bore .030, Rods .010, Mains .010
It has a Bullet Cam #310000 with the following specs: