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I would probably get the heads with the highest flow numbers... :jester Seriously though, what amount of lift are you thinking of running (1.5 or 1.6)? I'm not sure what the values are on the hotcam, but I do know that the CNC'd trickflow 23-degree heads flow very well compared to other more expensive heads- especially at and under the .500" mark. Their #s can be found on the website, and I would contrast those to the advertised #s of the other heads you're looking at to make sure. But for the money you probably can't go wrong. The twisted wedge heads are probably even better (not CARB legal) than the 23* heads, I just haven't looked lately.
Check out the trickflow website and they'll have all that stuff on there for you to read.
BTW, I have the 23* heads and am very happy with them- but I'm not going all-out either.
No offense, but the CNC'd 23 degree heads (the smaller port heads) don't flow for crap. I ported a set of 113's that flowed the same at 0.500 and 0.600 as those "Duttweiler" heads, and the 113's ended up with only a 178cc intake port as opposed to the 195 of the TFS heads, which means that the low end flow of the TFS heads is worse. The only heads they have that can flow at all are the R series head, and for a 215cc head, they don't flow either. The AFR competition package 210cc heads have better flow across the entire lift range. Do what you want, but I'm not the least bit impressed with those heads.
Trick Flow start as a quality option for an era dominated by Edelbrock. IMO Trick flow are an EXCELLENT CHOICE. There are better heads. But let me teach you something if you haven't figured it out yet. For increased performance takes an exponential amount of money. Z51racer is right in that his ported L98 heads may flow more than the TFS (Most L98 end up at 10% less than the unported TFS heads), but porting is the only area where DIY cost is not exponential to performance gains.
I'd say pick a head that you can live with the price a stick with it for your design.
Trick Flow start as a quality option for an era dominated by Edelbrock. IMO Trick flow are an EXCELLENT CHOICE. There are better heads. But let me teach you something if you haven't figured it out yet. For increased performance takes an exponential amount of money. Z51racer is right in that his ported L98 heads may flow more than the TFS (Most L98 end up at 10% less than the unported TFS heads), but porting is the only area where DIY cost is not exponential to performance gains.
I'd say pick a head that you can live with the price a stick with it for your design.
I would agree with Blue Thunder. I've had TFS 23heads for over 2 years. They're great. And the secret to good flowing heads is what they do at low and mid lift not high lift. The only head I would swap for is the AFR 190.
[Modified by Dominic Sorresso, 10:32 PM 2/14/2004]
the trick flow twisted wedge heads AREN'T smog legal? whats not legal about them? I bought them a ways back (love em), but I don't have to do emissions till may...
the trick flow twisted wedge heads AREN'T smog legal? whats not legal about them? I bought them a ways back (love em), but I don't have to do emissions till may...
PS: got an 85 and I live in Phoenix
The TFS 23 heads flow as well or better than the TW heads. And they have a
CARB #.
No offense, but the CNC'd 23 degree heads (the smaller port heads) don't flow for crap. I ported a set of 113's that flowed the same at 0.500 and 0.600 as those "Duttweiler" heads, and the 113's ended up with only a 178cc intake port as opposed to the 195 of the TFS heads, which means that the low end flow of the TFS heads is worse. The only heads they have that can flow at all are the R series head, and for a 215cc head, they don't flow either. The AFR competition package 210cc heads have better flow across the entire lift range. Do what you want, but I'm not the least bit impressed with those heads.
No offense taken. :D It's been about a year now since I shopped- but I compared the CNC'd Trickflows to the AFR 190s (I think) for use in my street setup (approx 0.500" lift max) and I remember them being extremely close-if not better- than the AFRs when using posted flow data on each companies website. The TFs lost ground on the AFRs on the exhaust side, but it was still respectable and for $1200 to my door, fully assembled, CNC'd and with upgraded springs... they were worth the money! And I didn't have to wait a few months for AFR to get around to making me some... :P
Are the TFs top of the line? Nope, of course not. But they work pretty damn well so long as you know what you're getting for your money.
Are the TFs top of the line? Nope, of course not. But they work pretty damn well so long as you know what you're getting for your money.
That's true, but that's also something a lot of folks don't think about...quality for the money. Are they the best out there? Not even close. Are they competitive in that price range? Yes.
CorvetteZ51Racer..... What do you think of Canfield heads? From what I've read they flow about as well as AFR, though a little weaker on the exhaust. I know you port your own heads, but who do you think makes a good set?
By the way, good to see you back on the forum lately. I wondered what happened to you: always enjoyed reading your input.
I put on the TFS23d heads completely out of the box. With a very mild CompCam roller, I got an additional 60rwhp from that combo. Chevy HiTech Performance and GMHiTech have done several dyno and flow bench tests with the TFS heads and have gotten excellent results with them. In fact, you can go to the Chevy HiTech Performance website and look at their flowbench library of cylinder heads. When I bought the TFS heads, I got them off eBay and paid $750 for a brand new set. The current prices are higher than that and I would now think twice about buying the AFR 190's instead. Cylinder head flow is one aspect of the performance equation. Chevy Hi Tech flow tests show TFS 23d heads with exhaust flow at about 73-75% of the intake flow. That allows for you to use a single pattern cam. But the combustion chamber design of the TFS heads is also more advanced than the 113 heads.
With 64cc chamber and flattop pistons, they put you somewhere in the 10.3:1 CR range