Welcome, Guest. Please login or register.
April 19, 2018, 07:23:13 am

Login with username, password and session length
TRADER Feedback System
IS NOW AVAILABLE
* SBFTECH Membership Required *
435155 Posts in 37248 Topics by 9534 Members
Latest Member: 88_GT
Search: Advanced search
Advertiser Inquiries
+ SBFTECH.com Experienced Small Block Ford Tech
|-+ Grass Roots Tech
| |-+ Grass Roots Cylinder Heads
| | |-+ Porting and Flow testing GT40 heads
0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] 2 3 ... 10 Go Down Print
Author Topic: Porting and Flow testing GT40 heads  (Read 80602 times)
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« on: October 21, 2011, 10:55:25 pm »

I figured I start a new topic and go step by step from stock untouched heads to the final product

Port #2 and 7 exhaust flow numbers

Heat transfer port plugged at intake
.1 - 51.2
.2 - 99.2
.3 - 131.4
.4 - 128
.5 - 129.8
.6 - 128.7

Heat transfer port plugged with plumbers putty in the port
.1 - 52
.2 - 102
.3 -  139.2
.4 - 140.1
.5 - 137.5
.6 - 135.9

Logged

<what the hell happened to my avatar???
jtmustang
Adv_SBFTechie
Big Block
****
Offline Offline

Posts: 3863

Location: arlington , washington

« Reply #1 on: October 21, 2011, 10:59:49 pm »

so these are the regular 40's and not the p's?

kinda curious...test away...
Logged
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #2 on: October 21, 2011, 11:05:41 pm »

Yes regular casting GT40's casting number F3ZE
Logged

<what the hell happened to my avatar???
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #3 on: October 21, 2011, 11:09:37 pm »

Intake numbers #2 port

.1 - 59.6
.2 - 120.1
.3 - 165.8
.4 - 190.7
.5 - 188.9
.550 - 191.7

Just found out that the intake can go no more than .550 lift. The exhaust went to 600 easily.
Logged

<what the hell happened to my avatar???
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #4 on: October 21, 2011, 11:26:23 pm »

So in the first steps all I did was clean the ports of any carbon with solvent and a wire brush, and gave the valves a lapping with some compound to freshen up the sealing faces. I am gonna do this to all ports to get a baseline.

The question is the next step.

I know a 3 angle valve job is recommend and I would like to deck the heads for sealing and cleaning purposes.

Do I start porting first? Get the heads decked and the valves cut then flow it and then port? I am thinking that porting first just in case I slip and hit the valve seat.

What do you guys think.

Outlaw Bill??? Cheesy
Logged

<what the hell happened to my avatar???
turbo2256
Big Block
*****
Offline Offline

Posts: 727

Location: KY, MICH, OH, IND, FLA

« Reply #5 on: October 21, 2011, 11:39:42 pm »

Can you make this chart out


* AIR FLOW SBF.jpg (53.01 KB, 495x352 - viewed 7225 times.)
Logged
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #6 on: October 21, 2011, 11:50:56 pm »

Yes, I can make that chart out.

That looks to be the flow numbers for a GT40X head with the 1.94 intake valves. I only have the 1.84 intake valves.
Logged

<what the hell happened to my avatar???
juiced coupe
Six figures worth of don't give a f*ck
Global Moderator
Big Block
*****
Offline Offline

Posts: 8383


Location: Pascagoula, MS
The land mass between New Orleans and Mobile


« Reply #7 on: October 21, 2011, 11:55:03 pm »

That looks to be the flow numbers for a GT40X head with the 1.94 intake valves.

Actually, they look like the numbers for the GT40Y heads. Not quite as good as the X heads.
Logged

Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #8 on: October 22, 2011, 12:24:38 am »

I used this site for base numbers. Obviously there is discretion. The guy could have averaged across the board

http://www.carbdford.com/tech/headflow.htm
Logged

<what the hell happened to my avatar???
turbo2256
Big Block
*****
Offline Offline

Posts: 727

Location: KY, MICH, OH, IND, FLA

« Reply #9 on: October 22, 2011, 12:45:23 am »

I thinking I remember the 40s flowing almost identical to the 351Ws except the exh was a bit better on the 40s.
I know ported 40s and DOOE heads flow the same. 235 @ .050 is possible along with improvements at each lift point. with the 1.9/1.6 valves. More can be had
Logged
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #10 on: October 22, 2011, 12:58:46 am »

I am sticking with the stock size valves.

The amount of work and money it takes to go 190s isn't worth it IMO. I want to see what I can do with these.
Logged

<what the hell happened to my avatar???
jayh
Big Block
*****
Offline Offline

Posts: 5471

Location: Buffalo

« Reply #11 on: October 22, 2011, 07:13:42 am »

I think its foolish not to put a 1.94 in there. Id keep the stock exhaust valve though

those can go 240-250 but it takes alot of work and alot of love

the iron gt40 and dooe351 are the same port
Logged

425" pump gas 6.2@110
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #12 on: October 22, 2011, 08:40:15 am »

You freakin guys are costing me money!!!!! Goddamn bigger valves maudit fuck.

I'll look into it. I am pretty sure Bill says no bigger than a 1.90.

I am gonna port them and flow them with the stock valves and then go from there I think.
Logged

<what the hell happened to my avatar???
Antony Moore
Stroked Small Block
****
Offline Offline

Posts: 318


Location: Beaver Dam, Kentucky

« Reply #13 on: October 22, 2011, 08:47:28 am »

No bigger than 1.9/1.54
Logged
5.0Torino
Small Block
***
Offline Offline

Posts: 240


Location: Sudbury, On, Canada

« Reply #14 on: October 22, 2011, 10:37:34 am »

x2.....   Naughty
Logged

<what the hell happened to my avatar???
Pages: [1] 2 3 ... 10 Go Up Print 
« previous next »
Jump to:  



Powered by MySQL Powered by PHP Valid XHTML 1.0! Valid CSS!
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines



408 Stroker