[dennislv]

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Don't want any PTV clearance issues.

Already have a Street Heat Intake.

Thanks...

[jkeyz]

both are good heads, I would go TW 170 just my opinion

[302Army187]

pretty sure the AFR's are inline heads, and therefor wont let the trickflow stage 2 cam clear.

plus afr 165 heads flow like shit.


whats with everyone going for this cam all a sudden? When I got mine no one had em.

[dennislv]

Well the cam came at a good price.

I'm concerned about the clearance. Since I already have a TF intake & cam, I think I'll go with the TF 170 heads.

My next question is whats the differences between the 2,3,4,5,etc at the end of the part number? TFS-5140000x

Thanks...

[69fastback]

TW170s without a doubt. The AFR 165s won't give any clearance issues either, because they have small valves, unlike the TWs 2.02/1.60 valves. The TWs shouldn't give you any troubles with that cam, and are leaps and bounds better than the AFR 165. The TW170 is better compared to an AFR 185.


It's still a very good idea to check P to V clearance, regardless of which head you are using.

[dennislv]

Right on. I've been leaning towards the Trickflow heads. Now, the flip side is I've heard that the AFR's are ported/polished out of the box (I've heard, don't know personally) whereas the Trickflows could use additional work to get them to their best potential.

I appreciate your responses. I'm about to drop the cash on these next week at the Summit store when I'm up in Reno on Tuesday.

Thanks...

[ryanw]

Originally Posted by 69fastback TW170s without a doubt. The AFR 165s won't give any clearance issues either, because they have small valves, unlike the TWs 2.02/1.60 valves. The TWs shouldn't give you any troubles with that cam, and are leaps and bounds better than the AFR 165. The TW170 is better compared to an AFR 185. It's still a very good idea to check P to V clearance, regardless of which head you are using.

I read some thing one time where the AFR 185 out flowed the trick flow 170s, but just barely....So I'm sure that the trick flow 185 will beat the AFR 185 heads, hands down.....what do you think, do you really think the Tw 170 will really out flow afr 185 ? I'm not being a smart ass i really just wanna hear your thoughts

[69fastback]

Originally Posted by ryanw I read some thing one time where the AFR 185 out flowed the trick flow 170s, but just barely....So I'm sure that the trick flow 185 will beat the AFR 185 heads, hands down.....what do you think, do you really think the Tw 170 will really out flow afr 185 ? I'm not being a smart ass i really just wanna hear your thoughts

No, I'm sure an AFR185 will outflow a TW170, but they are a lot more even comparison than a TW170, and an AFR165. The AFR 165 is more like an Edelbrock performer head because of then short runner and small valves.


I could be totally wrong about this, but I think AFR claims more CFMs in their 185, than TFS claims in the TW185, but the TW does considerably better in the mid lift range, where you spend most your time.

On a big bore block, the AFR is every bit as good, if not better than the TW because it doesn't suffer from the intake valve being shrouded like it does on the stock blocks. Stock blocks are where the TWs shine.

[93hatch]

afr 165s are like full of ridges where they were made, shit is stupid

[ryanw]

Originally Posted by 69fastback No, I'm sure an AFR185 will outflow a TW170, but they are a lot more even comparison than a TW170, and an AFR165. The AFR 165 is more like an Edelbrock performer head because of then short runner and small valves. I could be totally wrong about this, but I think AFR claims more CFMs in their 185, than TFS claims in the TW185, but the TW does considerably better in the mid lift range, where you spend most your time. On a big bore block, the AFR is every bit as good, if not better than the TW because it doesn't suffer from the intake valve being shrouded like it does on the stock blocks. Stock blocks are where the TWs shine.

good info, thanks

[dennislv]

So TW170s are the ones I'm going to get. Thanks for everyones responses!

[fogged306]

Originally Posted by dennislv Right on. I've been leaning towards the Trickflow heads. Now, the flip side is I've heard that the AFR's are ported/polished out of the box (I've heard, don't know personally) whereas the Trickflows could use additional work to get them to their best potential.

All AFR heads are CNC ported. That's where those ridges hatch was mentioning come from, the CNC machine. Trick flow heads are cast unless specified that they are CNC'd. Any TF head that says FAC is a cast head. FAC is fast as cast. Basically they started doing it with the 190's because it was a cast version of the 205 CNC ports. And now I believe they call all their cast heads FAC.

The fact that the AFR's are CNC ported from the factory doesn't really mean much. Yea the port walls are clean of casting flash, but the general shape of the TW port and valve placement is superior over the AFR port on a stock bore engine, and port design is a lot more important than nice shiny port walls.

[dennislv]

Another question... I have an old timer friend who's putting a bug in my ear saying aluminum heads warp and to be careful. He used the cadillac 4100 motor in particular saying that you always had to use the liquid additive in the coolant to get it to seal properly.

Are those problems a thing of the past?

Thanks...

[fogged306]

Yea, don't listen to the old timers. They like to live in the past. My aluminum heads have been overheated plenty of times and have never needed to be milled to get them true. There's tons of cars that use aluminum heads. I'm sure that caddy motor was just one of GM's fuck-ups somewhere. LSx engines are entirely aluminum from the factory, block and heads.

[69fastback]

No worries....a lot of old timers say that, and it's totally false. All production cars have aluminum heads now days, and a lot have aluminum heads, and an iron block. I have ran a lot of aluminum heads, and have yet to see one warp.

[69fastback]

I got tree'd!

[dennislv]

Thanks...

I appreciate all of your responses in helping me make my decision!

[fogged306]

Originally Posted by 69fastback I got tree'd!

.400 to a .401

[FastStang91Lx]

From what I always read from the benchflow people on here is that the AFR 185's outflow the mid range, but the tf170's had more cfm in the higher lift. Or was it vice versa? Either way, both are comparable heads with one being an inline. As far as the CNC'ing on the AFR's, it's available in two versions. One more rough, and one more smooth, from what I remember from back in the day.

[flyin ryan]

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