Dart vs Brodix vs AFR cylinder heads

[SStrokerAce]

Bret

Ever had these heads on an NA drag combination? If so, can you share the combination and how they performed?

Just saw the 125mph fbody you mentioned in yourearlier post. Anything else?

Only have a few sets done.... one is sitting in the shop! I wish the f-body could get down into some nice air!

[airflowdevelop]

are you allowed to post pics of the valve jewelery????

[SStrokerAce]

Nah that's secret squirrel shit at $35 a pop!

[3V Performance]

Bret,

What I understand you are offering is a head porting service for the dart heads.

Do you do them by hand or do you use a CNC program? If the later, do you own your own CNC machine?

On the Dart 200's you mention, what is the final size/ CC of the intake port that achieves the flow mentioned in this thread?

Do you also offer the same for Dart 230 Platinums?

thanks,

mike

Mike,

Actually no. It's a COMPLETE head, not just a service. The castings when they come here have to have specific details or they aren't going to work and it has to be a certain Dart casting so it's not offered on the 230cc casting.

This is the end result how it ships



The volume of the runner has never been measured because it honestly doesn't matter in any head unless we are talking Super Stock. The cross sectional area in each place along the port is the key and whatever volume that turns out to be is what it turns out to be.

The head should be in the 220-230cc range and it moves that kind of wind thru a 2.040" valve.

Bret

Bret these sound like a great set of heads. I like the 2.040 valve good move there.

[Fatman]

Bret

what about a bigger valved version for a 4.125-4.155" bore? has this been looked at?

[DeltaT]

Here's some pictures of my new AFR227 Comp-ported (V2) heads that came (finally) about a month ago:









And started trial fitting the T&D shaft rockers (1.7I/1.8E) and Stahl header adapters (still need port matching - they are really small compared to the AFR ports and will require a lot of material to be removed):



They were $1992 delivered, which included a ~$422 hit for the competition porting.

AFR assured me they would hit 321@.650I and 243@.0650E numbers and still gain a few cfm above that.

Can't wait to see how they actually perform under boost.

Jim

[SStrokerAce]

On a 4.125" bore?

[DeltaT]

4.155", 434ci.


Jim

[SStrokerAce]

That's what I thought.... 4.155" and 4.030" are different worlds.

[randy331]

How could .125" make that much difference?? It's only .0625" each side, and the heads bolt right on both bores!!

Bret, what made Joe decide to use a 200cc casting instead of the 215 he started with?
It sounds like final csa, and therefore volume ended about the same, and that would mean more machining for the 200cc casting.
Was there an area in the port where the 200cc casting had metal, and the 215cc didn't, and Joe wanted metal there? Chamber?

Randy

[SStrokerAce]

How could .125" make that much difference?? It's only .0625" each side, and the heads bolt right on both bores!!

Bret, what made Joe decide to use a 200cc casting instead of the 215 he started with?
It sounds like final csa, and therefore volume ended about the same, and that would mean more machining for the 200cc casting.
Was there an area in the port where the 200cc casting had metal, and the 215cc didn't, and Joe wanted metal there? Chamber?

Randy

Randy,

You would be amazed at the differences of the ports from 180, 200 and 215cc you would THINK that a 215cc based port would clean up in a smaller casting... it doesn't! They are all very odd and it took some heads to figure that one all out.

Chambers are even different from the SBC and LT versions, mostly because of the bore sizes.

Bret

[DeltaT]

4.155", 434ci.

Sorry, I think I misinterpreted your question to be asking what bore I was using.

AFR quoted those numbers to me for a 4.125" bore for their latest version 227 comp-ported heads. Another change is that they did (based on comparing mine to a friend with the earlier version heads) was remove some more material in the pushrod areas as so many people were having to do some clearancing there. Even with 3/8" PRs I did not have to do any clearancing.

Jim

[OldSStroker]

4.155", 434ci.

Sorry, I think I misinterpreted your question to be asking what bore I was using.

AFR quoted those numbers to me for a 4.125" bore for their latest version 227 comp-ported heads. Another change is that they did (based on comparing mine to a friend with the earlier version heads) was remove some more material in the pushrod areas as so many people were having to do some clearancing there. Even with 3/8" PRs I did not have to do any clearancing.

Jim

You didn't flow test them to get those numbers?

[scottcleaver]

Bret,
Are the 230cc Dart heads not worth working on to get additional flow? I own a set of pro 1 heads (before the newer platinum series) and they came with factory numbers somewhere around 308cfm at 700 lift. I really don't have a lot of faith in those numbers but thats not my point. I do want more out of them but I am not sure which way to go. They have been a good set of fairly inexpensive heads, is there much room for improvement?
thanks
Scott

[airflowdevelop]

Bret,
Are the 230cc Dart heads not worth working on to get additional flow? I own a set of pro 1 heads (before the newer platinum series) and they came with factory numbers somewhere around 308cfm at 700 lift. I really don't have a lot of faith in those numbers but thats not my point. I do want more out of them but I am not sure which way to go. They have been a good set of fairly inexpensive heads, is there much room for improvement?
thanks
Scott

how big of a pump are the going on? the "larger" pro-1 heads have material removed not always in the "correct" place for the application. They are a very good head. out of the box they go 294@.700 on my bench. I have done a 248+ CC deal (which means nothing) that moves very good wind.. so I would not count the head out. For the bigger engines they will want the PR-Pinch welded and offset the intake rocker.