RCR

Anyone have the flow spec? I think GMHTP had them in the Sept issue, but I can't find my copy. I want to enter the data into Desktop Dyno 2K to see if it makes a difference.

TIA

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Bob '89 Formula CC350
Last(lost)Member of the Elusive Great Lakes Crew
My car's homepage

BenIroc

Trick Flow heads port flow rate ( CFM)

Valve lift Intake Exhaust
100 54 60
200 130,5 108
300 186 139,5
400 216 160,5
500 222 177
600 222 184,5

BenIroc

BadSS

I have the same info that Beniroc gave. However, I questioned it when Westech first published those figures in 1995,, and I question it still. I have not had the ones I have flow tested, but I can say I have had them on a flat top 406 in a 3800lb car,, running pump gas and the car ran 12.40's through the mufflers idling smooth at 650rpm. I have these same heads on this 355 TPI IROC I'm about finished with and I know the car will go 12.70's or better with slicks and a proper fuel curve. So,,, the flow numbers don't support the power levels of the engines I've had them on. And,, man,, they are SUPER responsive expecially with this TPI set up.

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86 IROC - 9.8:1 - 355, TFS twisted wedge heads, 218/228-110, fully ported GM base and plenum, SLP runners, 52mm BBK, 24# SVO, 1 5/8" Headman headers, 3" Dyno-max, TH350, B&M Megashifter, 3.23 peg leg, 245/45ZR17s on 212 Eagles

BenIroc

This numbers for the TFS that I gave were
performed at Bob Lambeck`s shop on his
Superflow 600 flow bench.However I have this
heads in my 350 motor with all the TPI mods
you use to run and I have to agree with
Badass, very good power and very very good
response on the gas pedal. Mmm could be the
designe or the great velocity of the ports?
BenIroc
89 Iroc,TFS heads,LTR runners,58 TB,Edl base,
headers,MSD ignition,24 injectors,mod. trans,
Ford 9`` rear,3.70 gears and alot of traction
mods.

BenIroc

Sorry I meant to say BADSS.Sorry buddy.
BenIroc

RCR

Thanx guys. One question and one comment. What do the ",5" mean after a few of the numbers. And I believe the numbers you have are probably close, I've had these heads going on 4 years now and really like them, but the numbers are slightly different then those I found on the net for Desktop Dyno

.050 35 / 39
.100 73 / 69
.200 127 / 116
.300 186 / 155
.400 227 / 183
.500 254 / 204
.600 265 / 213
This is at 28" H2O

Maybe the difference is in the pressure used.

thanx,
Bob

BadSS

No problem Ben. Sorry,, they were flowed at Bob Lambeck's,,, and the engine they were on was dynoed at Westech. Yep,, very touchy throttle response. I seriously,, no bull,, have to concentrate on NOT spinning the peg leg 3.23 on a normal take off. Everybody that I've let drive the car so far,,, as soon as they put it in gear to take off,,, blows the tire,, jumps off the petal and says DANG (or something like that)!!! SUPER responsive and they will pull past 5700,, just get best times shifting at 5300 to take advantage of the torque curve.

jcb999

http://www.airflowresearch.com/chptest.html

basically the same as quoted by RCR

[This message has been edited by jcb999 (edited November 21, 2000).]

BenIroc

RCR ``,5`` means ``.5``.The problem with
different countries and different ways of
writing .5 I supose, oh well sorry .bout that

BenIroc

JakeJr

I've saved a lot of flow numbers that I came across this year when I was searching for a set of heads.

I'll send them to you and anyone else that's interested.
Jake

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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9

[This message has been edited by JakeJr (edited November 21, 2000).]

BadSS

The numbers Ben is giving you are for the G1 heads (from a 2/1995 Hot Rod),, like you asked in the "topic". However,,, they did not list if they were tested at 28" or 25". Based on the power levels I and others have been able to generate with "box stock" heads,, I'd guess they were flowed at 25".

The numbers from AFR's site and the numbers quoted from the desk top dyno net are for the current TFS G2 heads,, which are designed a little differently than the old G1s.

[This message has been edited by BadSS (edited November 21, 2000).]

BenIroc

I`ve only found more data of this TFS(G1)
in Jonhn Lingenfelter`s book( on modifying
small-block chevy engines).
He compares several cylinder heads at .400-inch valve lift.The tests are performed at
28 inches of water test pressure on a SuperFlow bench.Look at the great E/I(exhaust
to intake relationship) numbers.
PORT VOLUME.....INTAKE.....EXHAUST....E-I
185/73..........216........160........74
This is all I could get.
Seeya
BenIroc

BenIroc

I forgot to ask about the torque numbers
for the head bolts of this G1 heads. I`m going to take them off this winter to inspect
them and pocket port them and make the ports
just a little bigger,and I can`t remember
where I have those numbers, it`s been 4
years since I put them in the motor.
BadSS maybe you have those numbers?
Thanks
BenIroc

Box of Rocks

Ben, RCR, et al:

TFS is close to Twinsburg, OH. and the area code is 330. Directory has their # to get torque specs - hell, my old brain cannot remember, but I think it's 50-55 lb. ft.

Call to make sure.

Now, about those G1 TFS heads..........

I bought a set used, with 1.5 Crane roller rockers 3 years ago for $700.

Had them cleaned and checked,then.......

Eyeballed them - and discovered one of the roughest aluminum castings I've ever seen. I mean...check this out....I was able to break off a chunk of aluminum INSIDE a combustion chamber with my thumbnail - and guys, I'm NOT talking about a small chunk. Try one about the size of a water drop. Nasty.

So....I decided to do a full bowl port, blend, chamber smoothie, and match to an old style Edelbrock Torker single plane manifold. This motor is a .030 over 327 in a 3000 lb. car......

With an Extreme Energy 274 grind (230/236 dur. @ .050, .487/.490 lift)Comp cam , 1-3/4" Hooker headers, and an old Holley 700 cfm DP, running 10 to 1 compression.......

The booger went a corrected 12.68 @ 109.58 the first time out on drag radials. Uncorrected 13.10 @107.66 - way hot day.

Bottom end torque is remarkable for a 327. Pulls HARD to 7,000 RPM.

So, I think the G1 heads are a swap meet buyers dream - BUT....you must clean them up. And oh, all those rumors about bad valve guides on the G1's ?

Eh, me thinks some guys don't know how to set up valvetrain geometry.

If you're running a 327, 350, or maybe even a 383....I recommend the swap meet route on the G1's....that's a good value.

Oh yeah, you'll need new head bolts (hex) to fit.


BOR



[This message has been edited by Box of Rocks (edited November 22, 2000).]

KevinP92Z

Guys, after years of hearing so many blast the early TF heads for bad guides, I used to always chime in and say that folks probably weren't setting up geometry right, or yada-yada-yada. I always defended the heads because I had about 3-4 years on them with no problems. With stock bottom end and cam, my 350 ran 13.4's at HRP (hap plenty of mods like Edelbrock base & runners, 52mm TB, headers, catback TF heads, etc).

However, when the motor was pulled for the 383, the TF heads had pretty bad valve guide wear. Two valves were messed up, and four guides were toast. So a full rebuild was in order. I'm still happy with the early TF heads, I just found the valve guide problem on my own after several good years of use. They were worth the $675 from R&D speed when I got them way back then.

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KevinP92Z
92 Z28 383 SLP cam,SLP headers,SLP 2ontheLeft,Trick Flow TW heads & pistons,Edelbrock base,Accel SuperRam,52mmTB,Scat Crank & forged ConnRods,MSD 6AL,SLP convertor,Baer 13/12" Track,Moser axles,Hotchkis,Genuine GM 3.42s,SLP HD Torsen,17x9" chrome SS rims
96T/A w/SLP Ram Air,SLP 2ontheLeft, Bilsteins, Baer, Hotchkis, Genuine GM, Torsen
76 4X4 Blazer 400TPI project

RCR

Thanx everyone.
Ben, if you're in no hurry, I have the installation instructions at work. Unfortuneately I'm off til next Thursday. Otherwise email TFS's tech support. Artie (one of their techs) has been pretty helpful for me so far.

BenIroc

No hurry RCR.I`ll wait to email TFS`s untill
I`ve inspected the heads in case of some
problems with valve guides or else.
If no one has posted the torque numbers
this week then maybe you could post them
next week.
Thanks.
Ben