Best HCI combo NA?
- Thread starter 93STVCobra
- Start date
They are a great head, but are about $400 more then a AFR185... They will fit on a stock piston with a max of around .550" lift.
Good post, Rick! Question for ya: Do you go through Comp to get your custom cams, and do you use their lobe catalog? Also, is John's cam billet or SADI core?
I apologize, I couldn't think of a less abrasive way to word it. That, and I had just worked a 12 hour day and was a little irritable, haha. You know me, I try my best to keep conversation civil.
My TW 205s (which have the same valves and locations as the 185s) had ~.115" PtV clearance on the intake and ~.185" PtV clearance on the exhaust on my stock '86 short block, which of course has true flat top pistons with no valve reliefs. My cam with 1.6 rockers is ~.570" lift intake and exhaust, BUT I have very mild intake and exhaust duration, very little overlap, which is the saving grace there. (My junk is actually set up for a 1.7 rocker, which would have lift in the .600" range, but we went with 1.6 to save spring life a little.) My heads were also milled for a little compression, and my pistons were all between .005"-.010" above deck, BTW.
In other words, the repositioning of the valves on a TW head allow for some pretty awesome PtV clearance.
Also, FWIW, it should probably be mentioned for anyone reading this that the TW 185 is actually a lot larger head than the AFR 185. The port volume is misleading, because the TW has a shorter port with a bigger cross section. The TW 185 flows roughly 25 more CFM on the flow bench, from what I remember.
I use COMP and their Master Lobe Catalog, his was a SADI core...no need for billet on that one.
Here's a pic of John's beast, pretty ain't it
That is a sexy engine, haha. One of the best powder coating jobs I've ever seen.
Rick, out of curiosity, in your opinion when is a billet cam necessary? My cam is a SADI, and also is a custom pulling lobes from the Comp catalog. I originally was leaning toward billet, but Mike over at TEA seemed to think it wasn't worth it.
I use COMP and their Master Lobe Catalog, his was a SADI core...no need for billet on that one.
Here's a pic of John's beast, pretty ain't it
heres to date pics
I havent had the pleasure of flowing a set yet, but your right about the cross section, can't just look at the number. I put a set on a 347 but never got it on the dyno, the heads looked great and come with decent valvetrain and seals.
I look at spring pressure amongnst other things when you get into a billet core, the profile matters as well. Almost all my soild roller stuff ends up being Billet.
Dude, the AFR 185 heads are PERFECT for a 331-347. You need to understand how these heads are designed. Very state of the art. By the way I have a 347 and the 185's. AWESOME
