Are TF or AFR heads better? It is going on a turbo 377 moto if that matters. Also it will be a street car driven probably every week. I am looking for which one is more efficient on this motor? I think they are close to the same cost so cost isn't a MAJOR factor right now. or if anyone has anther choice on a different head.ofer it up

 

afr are better...i have 23* tfs ones and like them

 

AFRs are definatly a better head.

 

AFR

 

AFR

 

AFR

 

AFR all the way if you can afford them.
I have 2 friends with the trick flow 23* heads, both have broken the cheap valvesprings that the heads come assembled with if you chose not to upgrade the springs when you order. Also, both had their heads flowed and it was far less than trick flow advertised, both were about 240 @.500 intake whereas trick flow advertises 253@ .500 intake.

 

253@.500 is the G2 heads...i haven't broken any springs in 4 years and shift around 6-6200rpm and up to 6700rpm a few times i drive my car every day i don't know why they'ed be brakeing springs

 

Thats why you simply don't buy them with the 1.25" springs. Those springs are for very mild applications. Call trickflow and talk to them, if your running anything but the mildest of cams they'll recommend that you go with the 1.47" spring. And AFR isn't exactly known for their incredibly strong valve springs either...quite a few people have had problems with the stock hardware in AFR heads. That said, AFR is a better head, but they are a couple hundred dollars more than the trickflows.

Eric

 

I will probably buy the bare AFR head (new) or some used assembled ones and replace the stuff like springs and valves etc....I don't want nothing to break and cause a screw up in the engine

 

My friends were both running hydraulic cams with well under .5 of lift.

 

I went with AFR 210's on my twin turbo Little M (400 cid)...

 

This is a very valid point, many heads available have this problem. In order to be competetive manufacturers will load the heads with substandard components. Since AFR and Brodix are the ones to beat, this might not be needed if AFR's are purchased.

 

I have had very good results with the Trick Flow heads. I have them on a mild 355 and it seems to run good. I have never used the AFR heads but seen them on alot of combos. I will continue to use the Trick Flow heads on my next engine.

 

I'll put the TFS G2 heads up against the AFR 190/195 head any day of the week. It's a GOOD head- every bit the equal of the 190/195 AFR. And I say that even though I chose AFR 190 heads for my current motor.

Where people get in trouble with the G2 is that they are designed to handle ONLY .520 lift at the valve- no more. Combine that with the fact they they REQUIRE custom length pushrods AND TRICK FLOW'S SPECS ARE OUT TO LUNCH ON CORECT PUSHROD LENGTH ON THEIR WEBSITE and I can understand why some people have had valvetran problems with them.

I have actually checked pushrod length/rocker geometry vs. TF's specs on their website and found it to be almost .200" too long in 2 cases! That's a LOT. When spec'ed out with proper length pushrods they worked just great.

 

TFS 23 degree heads flow as tested by CHP magazine (stingy flow bench)



TFS 23 degree heads as tested by TFS dealer pacific performance

LIFT INTAKE EXHAUST

0.100 50.6 57.9
0.200 135.8 98.3
0.300 191.0 136.4
0.400 229.7 162.9
0.500 253.1 176.9
0.600 254.3 189.6

TFS G2 heads as tested by TFS dealer pacific performance

LIFT INTAKE EXHAUST

0.100 68 53
0.200 144 106
0.300 206 144
0.400 242 173
0.500 252 195
0.600 257 205

AFR 190cc heads flow as tested by CHP magazine (stingy flow bench)



AFR 190cc heads as tested by AFR



I would be curious to see how the G2's would fare on CHP's stingy bench still AFR hands down. Get the competition package 190 AFR's or the 195 AFR's (or 195 competition package) either were not shown tested anywhere here and the winner is still AFR. BTW I got my 195 AFR's (standard package) for $1050. The G2's are under $1k but lift limits can hurt some of us but probably not most.

 

Flow ain't everything. The G2 has much better spark plug location (closer to the center of the chamber) due to the intake being moved considerably towards the center of the chamber.

Swapping a set of G2s back-to-back against my favorite low-buck Iron Eagles (which I THOUGHT were pretty good) the power increase was, frankly, stunning. I never expected even the slightest noticable increase in power. It was very noticable. I changed my attitude about the G2s real quick once I used them.

My current AFR heads are very nice and make good power, jsut as advertised, but it's not like they would just walk all over the G2s. I doubt there would me much difference between the two at all, actually.

My experience with the G2 is one of those where the raw numbers don't tell the whole story.

 

iron eagles have horrible flow, your right flow isnt everything velocity has alot to do with it. As far as spark plug location goes switching from straigh to angle plug is a good example of something we do that has no visible HP gain in most cases but we do it any way, what I mean is if flow isnt everything then why are so many people wanting the L31 heads? I cant tell you, its flow and combustion chamber design. the flow #'s for a L31 kick the hell out of sptsmn II's below .500" for a TPI guy or most street guys cams, thats where they live anyhow.