im not too big on engine tech can someone please explain to me what is the deal with these heads and how they will improve your car. what is good about these


thanks u guys

 

The best thing about them is their marketting department.

For most builds properly ported stock heads are the right choice. If you want more than that the Trickflows ported are great.

 

Actually the AFR's are excellent heads. Check out GM High Tech performance's newest lt1 head shootout. They made more power than any head tested on a golen 383 shortblock. Even more than the TEA CNC'd trickflow's. And the AFR's tested were the cheaper street port Eliminator 195 and still bested all the rest. Imagine what the competition AFR port job would have done. Too bad AI wasn't tested. But I think the result would have been the same as the TEA's.

Also the AFR's are shipping with lightweight 8mm valves and smaller springs. I've been considering trading in my ported lt1's because the exhaust flow is so much better on the AFR's. The competition AFR port jobs are flowing 300+ on a 195 port and the under the curve numbers are very good.

http://www.gmhightechperformance.com...son/index.html

 

The test was completely rigged. They dyno tuned one set of heads and then left the tuning untouched for the others.

 

afr's are overpriced boat anchors

 

Good thing you were there to spot that...... They might have gotten away with it.

 

They also left the same small cam for all the tests, does that make it invalid as well since different heads like different cams? One could argue that a higher lift cam could have been used and the AFRs with their higher peak flow at high lift would have made the gap even larger, leaving the smaller heads choking and stalling earlier in the rpm range

The test wasn't perfect, but it was def not dismissable. Ported stockers are fine for a stock cube street car, and porting a nice set of aftermarket heads like Darts or TFSs are plenty for most people with strokers, but IMO for a "max effort" LTX build it doesnt get any better then ported AFRs unless you are willing to convert SBC race heads.

 

i hear all these people yammer on about how spectacular AFR's are but i never really see any AFR headed engine making a significant difference in horsepower over other setups. and in most cases the AFR 195 head is paired against a 180cc on a large engine or 210 on a 350 where it is always against a mismatched setup.. its all bull. and they will talk their way around any downfall to the point where you are actually dumber.

 

I don't know why so many of you guys talk so much crap about certain manufacturers. Here at Cook Performance Engines, we have installed, AFR, TFS, AI & so on cylinder heads with great results from each one. The AFR heads are not overpriced for what you get. You guys that are bad mouthing any of these companies need to get a clue.

 

 

So is there anyone out there that can clue us in with some AFR results? I know a couple guys local running AFR's with nothing that seems that much better than other heads for the price difference. I wonder how Ai's ported AFRs run?

 

the fastest lt1 is running AFR heads running almost 8 flat....

 

This is rediculous. It was a fair test and their weren't any mismatched combo's or special dyno tuning. AFR makes a quality head and their CNC process is up there with the best in the industry.

There is quite a difference in flow numbers from the old AFR's(pre 2006) and the new Eliminators. So if you are buying used AFR's make sure that the heads have "AFR" stamped under the exhaust ports instead of "A"

 

AFR's are probably the best of the LT1 heads as received with their CNC porting. If you understand head porting, you realize that if you put enough work into any set of castings you can pretty much get what you want. A comparison of ported heads is thus more a comparison of porters than of heads. A porter himself could explain which castings he likes to work with and why and which takes x amount of work to get y result.

Rich

 

There is a guy on the Corvette Guru doing an AFR 195 Comp Port vs Lloyd Elliot Trickflow 195 head comparo. This is being done on a moderately built 383. He already has the Trickflow dyno and track results, and should have the AFR results within 10 days.