Port heads or replace them
Safety Car
Joined: Nov 2004
Posts: 4,991
Likes: 5
From: The Pines South Jersey
What about this as a lower priced alternative?
http://www.adperformance.com/index.p...roducts_id=546
BTW, I have also been taking a look at the TFS 175s
http://www.adperformance.com/index.p...roducts_id=546
BTW, I have also been taking a look at the TFS 175s
Safety Car
Joined: Nov 2004
Posts: 4,991
Likes: 5
From: The Pines South Jersey
Uhm, why pay $1250 to have used heads reworked? Just what flow
values do LPE and TPiS quote for ported 113's, anyway. Not only the
peak values, the whole series across the board.
Has anyone looked at the Trick Flow 175's? Priced them? Considered
the bang/buck?
Anyone?
The most expensive pair of TFS 175's at Summit costs less than the
$1250 port job mentioned above. The basic ones are hundreds less.
What am I missing here? Time after time, people turn up their nose
at these things and I don't understand why.
I'll add that I've got nothing against the AFR 180 Eliminator's - aside
from the point that, out of the box, they are not a direct replacement
for the 113 because of the chamber size. I imagine AFR could change
this easily by offering a version with a smaller chamber.
.
values do LPE and TPiS quote for ported 113's, anyway. Not only the
peak values, the whole series across the board.
Has anyone looked at the Trick Flow 175's? Priced them? Considered
the bang/buck?
Anyone?
The most expensive pair of TFS 175's at Summit costs less than the
$1250 port job mentioned above. The basic ones are hundreds less.
What am I missing here? Time after time, people turn up their nose
at these things and I don't understand why.
I'll add that I've got nothing against the AFR 180 Eliminator's - aside
from the point that, out of the box, they are not a direct replacement
for the 113 because of the chamber size. I imagine AFR could change
this easily by offering a version with a smaller chamber.
.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
What about this as a lower priced alternative?
http://www.adperformance.com/index.p...roducts_id=546
http://www.adperformance.com/index.p...roducts_id=546
or 72cc chambers. Add $318 for single and $370 for
double springs, price to mill them to 58cc is unknown.
No flow rates provided that I noticed.
.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
http://cgi.ebay.com/ebaymotors/ws/eB...1313828&rd=1,1
Last edited by TA; Mar 17, 2007 at 11:04 PM.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
compression by a full point on your '91 L98.
For '91, the L98 had 10.25:1 compression with 58cc heads and flat top
pistons (w/ v reliefs).
Using the following assumptions
- 4.00" Bore
- 3.48" Stroke
- 4.03" Head Gasket Bore
- 0.039" Head Gasket Thickness (Compressed)
- 13cc Piston Valve Reliefs
- 0.00" Deck Clearance
Compression calculates out thus- 3.48" Stroke
- 4.03" Head Gasket Bore
- 0.039" Head Gasket Thickness (Compressed)
- 13cc Piston Valve Reliefs
- 0.00" Deck Clearance
54cc = 10.54:1
56cc = 10.29:1
58cc = 10.05:1
62cc = 9.62:1
64cc = 9.42:1
68cc = 9.04:1
72cc = 8.69:1
74cc = 8.51:1
76cc = 8.38:1
.
56cc = 10.29:1
58cc = 10.05:1
62cc = 9.62:1
64cc = 9.42:1
68cc = 9.04:1
72cc = 8.69:1
74cc = 8.51:1
76cc = 8.38:1
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Thanks for all the input guys. I did find a super chevy link with flow numbers for the Dart Pro One 180cc heads. They appear to flow pretty decent, but obviously I'd still have the 64cc chamber to deal with.
http://www.superchevy.com/technical/.../0506sc_major/
http://www.superchevy.com/technical/.../0506sc_major/
Last edited by TA; Mar 17, 2007 at 11:07 PM.
Burning Brakes
Joined: Jun 2006
Posts: 1,096
Likes: 28
From: Baltimore MD
Has anyone looked at the Trick Flow 175's? Priced them? Considered
the bang/buck?
Anyone?
The most expensive pair of TFS 175's at Summit costs less than the
$1250 port job mentioned above. The basic ones are hundreds less.
What am I missing here? Time after time, people turn up their nose
at these things and I don't understand why.
.
Although I didn't buy those, I bought the hybrids, made by TFS, "Summit" 170's w/62cc chambers and used .015" compressed head gaskets with them to get comp. ratio where I wanted it. So far, and even with my new combo far from dialed in, I'm very happy with my $950 investment. 
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Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
That's another way to achieve the goal, but I believe that quench
area suffers a bit when a thin gasket is used to compensate for
a larger than optimimal chamber
This is a good opportunity to point out that although I've been going on
about one particular line of heads, it isn't about the brand - it is about
suitability for the application.
The characteristics of these heads just seem to make them the optimal
performing, most closely suited direct OEM replacements for L98's with
D-113's that are currently known to me.
.
area suffers a bit when a thin gasket is used to compensate for
a larger than optimimal chamber
This is a good opportunity to point out that although I've been going on
about one particular line of heads, it isn't about the brand - it is about
suitability for the application.
The characteristics of these heads just seem to make them the optimal
performing, most closely suited direct OEM replacements for L98's with
D-113's that are currently known to me.
.
