BeachBum wrote:
Looks like a fun test !

I do not know a lot about those particular Trick Flows, but in general, I've always thought of Trick Flow as a company well focused on the street/strip generation and a good cylinder head for our applications..... should be a competitive test.

I know those TFS 195's are advertised to flow in the mid 250's before porting.... so I guess it is a matter of how much work is done to them as to exactly how competitive they are.


Good Luck !

I'll be swapping between 2 sets of heads for the test:

TFS aluminum 195 CC heads, P/N TFS-30400006-CNC.
The heads have bee hive springs, 10 degree locks, and titanium retainers.
The heads have been lightly ported and decked by Lloyd Elliot.
Total retail for the heads with port work and upgraded springs is $2000.

AFR aluminum 195 CC heads competition ports, P/N AFR-1095. Nothing has been done to the heads, they will be bolted on as they come from AFR. Total retail for these heads is $2016.

Hi Josh,

They did arrive and I already have a bunch of information for you.

First off they are 100% ported….not just a bowl cleanup like you had alluded to. Guides are narrowed and necked downed nicely and this head had been ported from one end to the other. I might add it was done by someone who looked like they knew what they were doing and had a very neat hand (the walls were straight and the overall execution was certainly above average). The porting might not have been as obvious to you because the heads were glass-beaded when they were freshened disguising some of the finish sandroll marks that are clearly evident when you look closely.

Finished intake port volume 205 cc’s

Intake Flow

.200 @ 140
.300 @ 200
.400 @ 245
.500 @ 274
.550 @ 280
.600 @ 282

Exhaust port finished volume 76 cc’s

.200 @ 108
.300 @ 144
.400 @ 176
.500 @ 190
.600 @ 204

Combustion chamber volume is very small @ 57 cc’s (just under actually like 56.8 actually)

BeachBum wrote:
Based upon the new information of the TF flow numbers, I'm thinking that the competition AFR 195's have an advantage of 10-20 hp due to increased flow..... but, with the small combustion chamber of the Trick Flows, compression will be up to close to a full point, which might steal some of that advantage..... but I dunno. (I assume the AFR's are the 64 cc chamber) What will your compression be with the two heads ?

No matter how you slice it, looks like a fun test....have fun with it !!

Josh wrote:

I'm not sure what I'm going to do about compression ratio right now. If I run a .030 gasket (which is what I want to do, I'm looking for a ~.045 quench) that puts the TFS heads at ~11.8:1. I'm not comfortable with a SCR that high. If I run a thicker head gasket the quench starts to suffer pretty badly.

What I'll probably do is use a .040 gasket on the TFS heads, which puts me at ~11.5:1. I don't like the compression that high, but I don't really see another option.

Then, I'll use a .028 gasket with 65CC chambers on the AFR heads for a final compression ratio of ~10.8:1.

Engine is a 383 with the following parts:

TPIS miniram with 1205 size ports
Eagle cast steel crank
Eagle forged rods, 6 inch, h-beam
SRP forged flat top pistons, .015 below deck
Chromoly rings
Comp Cam XFI cam P/N CCA-08-467-08 (230/236, .576/.57, 113 LSA, 56 degrees of overlap)
The rest of the engine is stock or new stock replacement parts.

Josh wrote:
I can't spend any more money on the TFS heads to open the chambers up. I would like to, but like you guys, I'm stretched pretty thin right now.

BeachBum wrote:
I think despite the compression issues, it is still an interesting test..... I'm not sure, but I think in corner A: we have a 195 cc head that flows 300 cfm and will result in approxmiately 10.8-1 cr with its 64cc chamber. Whereas in corner B: we have a 205 cc head flowing 280 cfm and will result in approxmiately 11.6-1 cr with a 58 cc head.

Thus, one head is a little smaller, flows bigger but has almost a point less of a compression. It becomes a battle of flow vs compression so to speak. Will be interesting to see the effect.... I'm going to run it on my sim out of curiosity..... I don't know how accurate it will be, but its something to bench race about.

On financing for the test.....I've spent "a lot" of money over the last few months on my toy including $ 2500 to one of the manufacturers in this test.... but, I'll still throw a fifty or something into the hat if need be. Thats not a problem, but I will say, a test like this, you should be lobbying the very people who would benefit from this, which is potentially AFR or Trickflow or maybe the cylinder head porter......I'm betting the winner of a test like this could potentially see 10-20 cylinder heads sold over time based soley on the results of a test like this..... thats 10-20 thousand and would have warranted a few hundred dollar donation of some sort towards the free marketing exposure or at least you would think so.

Josh wrote:
I don't have any porting experience, so I'm not comfortable taking a burr to the combustion chambers. I hadn't considered that you meant I could do it myself for little to no cash; communication barrier of the forum/Internet I suppose.

Josh wrote:
If you are looking for a good set of heads, I plan to have the TFS heads for sale in a month or so. I don't have any real surplus parts, but I do have some exhaust manifold gaskets you can have for shipping. I also have an LT1 intake that is part of an aborted conversion. The distributor hole has been messed up pretty bad, but someone with more time than I have might be able to make it work. Again, catch the shipping and it's yours. I have the LT1 fuel rails with -8 AN fittings TIG welded onto them that you can have as well.

dan0617 wrote:
Running a .035 quench with stock 400 rods (with arp bolts) and crank and speed pro forged pistons in a 350 block to make a 383.

BeachBum wrote:
To liven this dyno test up, I think we should have a poll shootout on the dyno results.... closest to guess the results, wins a guru hat or something fun like that.

Who's dyno and what type of dyno will this be on ?