as cast usually means ready to be ported.
"as cast heads"
Thread Starter
Drifting
Joined: Feb 2004
Posts: 1,250
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From: Katy TX
St. Jude Donor '08-'09
"as cast heads"
has anyone besides Vengence applied these heads? Any thoughts from those that have? Hp/torq. increases, performance, seat of the pants?
TF has stated to me a gain of 40-60 hp. over stock heads. They will be replacing old MTI (Houston) 2e heads that gave me nothing.
TF has stated to me a gain of 40-60 hp. over stock heads. They will be replacing old MTI (Houston) 2e heads that gave me nothing.
Le Mans Master
Joined: Jun 2002
Posts: 9,220
Likes: 17
From: San Diego California
I have been doing a lot of searches on the subject of heads lately. I think we need more information.
Who's cast heads are they? What is the source company and who do you plan on doing the CNC?
Who's cast heads are they? What is the source company and who do you plan on doing the CNC?
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Thread Starter
Drifting
Joined: Feb 2004
Posts: 1,250
Likes: 0
From: Katy TX
St. Jude Donor '08-'09
Trickflow has created a 220 head that was designed with the porting that was accomplished on there CNC 215 heads. It is a ported head without the polishing. HP figures are 40-60hp over stock heads.
Melting Slicks
Joined: Sep 2005
Posts: 2,568
Likes: 212
From: Winnipeg
The TFS "as cast" heads are fully CNC'd in the chambers, just have a rough cast runner. Ron at Vengence says there is an 8-10 hp diff between these and the CNC 215's.. also they are 700 bucks less. 
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Burning Brakes
Joined: Aug 2008
Posts: 887
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From: North Plainfield New Jersey
so just almost the same but not polished in the runner? Couldn't it just be polished then?
Race Director
Joined: Oct 2002
Posts: 16,477
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Look at any GOOD cnc'd head, and note the tool marks and surface roughness in the runners...they are purposely left there for a reason.
That desired surface finish (roughness) can easily be achieved in casting, but it's only advantageous IF you can nail the port dimensions right in the casting process. (As opposed to others, who purposely cast heads with extra material added, only to machine out to the finished dimensions).
So it's not that one is finished, and the other isn't...it's two different methods of achieving the finished product.
That is why "as cast" are so much cheaper, it eliminates a lot of machine time and labor to manufacture the finished product.
Burning Brakes
Joined: Feb 2001
Posts: 793
Likes: 2
From: Milwaukee & Long Beach WI & CA
There's a thread on ls1tech that covers this:
http://www.ls1tech.com/forums/dynamo...ds-please.html
See posts 20 and 24.
http://www.ls1tech.com/forums/dynamo...ds-please.html
See posts 20 and 24.
