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Author Topic: GT-40 head porting, a compilation with a bunch of pics and measurements  (Read 42712 times)
347HO
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« Reply #15 on: May 06, 2013, 05:34:18 pm »

Wholly hell you can take a butt-load off that exhaust port!!!
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... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
Javier
Ugly?  Easy now -- that's my baby and it's got lots of unique character!  When I drop that built 445" stroker in it you won't have any time to "pull over to let me pass" because I'll have already blown past you when you figure out what the hell was that loud noise behind you . . .  
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« Reply #16 on: May 06, 2013, 05:49:23 pm »

Are you sure that is a GT40 cutaway? The short-turn looks more abrupt and shallow than what I remember a GT40 exhaust port being...
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David Claflin
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« Reply #17 on: May 06, 2013, 06:59:45 pm »

Are you sure that is a GT40 cutaway?
Nope, just one of the pics that came up, should have clarified.
This is the original link for the pic.
http://www.mre-books.com/ford/engines/cylinder_heads.html

Found what is supposed to be a GT40 intake port cutaway
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
David Claflin
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« Reply #18 on: May 07, 2013, 03:53:19 pm »

Looking at my exhaust port, vs the one Shannon did, I see where the differences are



http://forums.corral.net/forums/5-0-5-8-engine-tech/1269774-ported-iron-gt-40s-flowed-today-156cc-240-184-a.html
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
347HO
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« Reply #19 on: May 07, 2013, 04:12:29 pm »

Sort of what I mentioned earlier in another thread...  I (just me) look down the port to the valve seat and visually see how much of the "seat area" I can open up to view.  Imagine you are the column of air.
However, the viewing aspect/angle I'm talkling about is much greater than the pictures you posted.

Most often the valve seat "view" is shaped like a skinny, pointed, football.  When I'm done it looks more like a fat, blunt, football.
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... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
Javier
Ugly?  Easy now -- that's my baby and it's got lots of unique character!  When I drop that built 445" stroker in it you won't have any time to "pull over to let me pass" because I'll have already blown past you when you figure out what the hell was that loud noise behind you . . .  
David Claflin
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« Reply #20 on: May 07, 2013, 05:55:58 pm »

Yeah, that makes sense. It'll be awhile before I can work on these again, was hoping to get them over to Ray the end of the month for a valve job, but may not make that.
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
David Claflin
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« Reply #21 on: July 07, 2013, 07:16:46 pm »

Because of the torrential rains we had over the holiday weekend I was able to get some more done on this head. I'm hoping to get the other one done and take them over to Ray the end of the month. I didn't do much with the intake on this one, just took away some material around the valve guide.

I think using a sanding roll more and less of the carbides will prevent some of the divots that you can see around the base.
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
David Claflin
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« Reply #22 on: July 07, 2013, 07:17:30 pm »


I took material off of the floor on the exhaust port, and contoured the area around the valve guide too

Makes for a better site picture to the bowl
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
David Claflin
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« Reply #23 on: July 07, 2013, 07:18:16 pm »

Here's a tool I made to help measure the inside of a port that has a bend in it.
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
David Claflin
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Location: Redneck Riviera (Ft Walton Beach Florida)

« Reply #24 on: September 22, 2013, 01:15:32 pm »

Have I said Fuck lately?!? I had these other set of heads from my son's 94 cobra that I intended to use on my LX with just a mild port, mostly bowl and exhaust work. I thought whittling down the area around the valve guide boss on the exhaust would really help, but I apparently went a bit too far. got a little hole between the valve guide and the divot where the flat spot is in the exhaust port. I'll smooth everything out and put epoxy on it just for gee whiz to see what it does on Ray's bench. Pics coming later on.
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
347HO
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Location: Seattle, Washington
I believe they landed on the moon.


« Reply #25 on: September 22, 2013, 01:57:12 pm »

If you think you can afford to take more off the floor, each side to make the "football" less pointy...

If they were mine, I would be.
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... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
Javier
Ugly?  Easy now -- that's my baby and it's got lots of unique character!  When I drop that built 445" stroker in it you won't have any time to "pull over to let me pass" because I'll have already blown past you when you figure out what the hell was that loud noise behind you . . .  
David Claflin
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Big Block
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Location: Redneck Riviera (Ft Walton Beach Florida)

« Reply #26 on: September 22, 2013, 03:34:35 pm »

If you think you can afford to take more off the floor, each side to make the "football" less pointy...

If they were mine, I would be.
I actually did a little bit. I'll get some pics later on. After comparing the two I know what I did wrong, and will just stick to what works on the next one.
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
Mr.Blue
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« Reply #27 on: September 23, 2013, 10:27:40 am »

Have I said Fuck lately?!?

Whoa!!!!!!!!!
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Rodney Tolleson/VP SBFTech van club
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« Reply #28 on: September 23, 2013, 11:36:56 am »

nice job!
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« Reply #29 on: September 23, 2013, 03:25:20 pm »

thanks for the info  should help me with my p's
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90 notch lx
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