TFS High Ports on stock short block with stock cam

1BAD86 · 11-01-2009, 11:24 AM

Anyone ever run high ports on a stock short block and used the stock cam? I am concerned about piston to valve clearance. I wonder if they would clear with the stock cam.

Jay Allen · 11-01-2009, 11:29 AM

Quote:

Originally Posted by 1BAD86

Anyone ever run high ports on a stock short block and used the stock cam? I am concerned about piston to valve clearance. I wonder if they would clear with the stock cam.

When I worked at TFS in 1991-1992, we used to do this a lot. The stock cam with 1.7's was our staple because there weren't any cams back then, really. Of course you need to check, but it should clear by a lot.

paxton50mustang · 11-01-2009, 07:01 PM

Quote:

Originally Posted by 1BAD86

Anyone ever run high ports on a stock short block and used the stock cam? I am concerned about piston to valve clearance. I wonder if they would clear with the stock cam.

If you are doing this on a 86 short block, almost no aftermarket head will even work without fly-cutting the pistons, they are flattops without reliefs.

1BAD86 · 11-03-2009, 01:41 PM

It's a 92 short block, I should have specified.

I don't have the funds right now for a new short block, I prefer not to notch the pistons and I prefer the high ports over the TWs (which would obviously not have clearance issues with the stock cam). I now need to find some high ports (preferably new I suppose) and see what the engine will do with the stock cam, H/Ps, Track Heat intake, 75mm etc...... If I can get a season or two out of a 100% stock short block I will be happy.

CNCOX · 11-03-2009, 05:23 PM

That's a lot of head for a stock short block- I wanna know how it turns out.

Michael Yount · 11-03-2009, 05:30 PM

Read this thread - check out Buddy's comments about the stock cam's valve events and how they match up with high flowing heads and complementary components. I think Jay's pointing at the same thing with his post above.... http://forums.corral.net/forums/show....php?t=1174268

Jay Allen · 11-03-2009, 09:51 PM

Quote:

Originally Posted by CNCOX

That's a lot of head for a stock short block- I wanna know how it turns out.

Another person looking at port volume and volume is MEANINGLESS w/o knowing the port length.

Length adds volume.

The High Port design has the longest port of the basic in line heads. This is where the ACSA comes into play and this has been done more times than you can shake a stick at it.

170cc TFS TW
170 / 16.39 / 4.75 = 2.18 IN^2

185cc AFR
185 / 16.39 / 5.00 = 2.26 IN^2

192cc TFS HP
192 / 16.39 / 5.25 = 2.23 IN^2

The difference in 2.18^2 ACSA & 2.26 IN^2 ACSA is nothing with 2.23 IN^2 in the middle. No one has issue with a 170cc TW on a stock short block.

Its all about LEARNING what is what and not just spouting out numbers because they "look" big.

FWIW.......When I was TFS, I used a set of unported iron HP that were milled to 58cc. Stock cam, 1.7 RR, GT-40 lower fully ported (for back in the day) no weld, Down's Ford Box Upper, 70/75mm TB and a 76mm Pro-M. 1 3/4 J302 headers with straigh 3.00" exhaust. Stone stock short block. Car weighed north of 3200#. Ran 11.80's all day long and ran 11.70's once in a blue moon. It idles better than stock. Shifted under the REV limiter.

It makes a nice combination.

CNCOX · 11-03-2009, 10:32 PM

I spouted no numbers...

You are a smart fella, you seem eager to share your knowledge you picked up from TFS and share it with those in need.. Me- well, I am a mold maker... Done it all, from design, CAM programming, even operating the 5 Axis HAAS VMC's in the manufacturing facility. It's a family business. I have to know everything there is to know. I understand ALOT about flows and volumes... even crazy stuff like thermodynamics and the sciences of controlled rust- what I do not know is alllllll about TFS heads...

I was under the impression, and here is where you have me by the balls, that the HP was a 225 runner... 225/16.39/5.25 = 2.61 IN^2

And had I used a coefficient like that of the TW of 4.75, well you get the idea.

Understood, you burnt me... But I do understand flow, I was just unfamiliar with the runner length difference between the two heads, and for that I do apologize.

With that said, Jay Allen knows his heads... and I was 2 years old when he quit working for TFS (Had to throw that in there).

Good day to ya.

And good luck with the build.

Stopsign32v · 11-03-2009, 11:01 PM

Go for it!!!! Too many people on here are stuck on the if you have a 302 you need little heads train! Match the exhaust, intake, degree the cam, and she should run damn hard! And be one hell of a sleeper!