Ported Ford 289 heads with port energy discussion

[BILL-C]

Looks like you fixed the seat to chamber transition.

[Carnut1]

Looks like you fixed the seat to chamber transition.

The seat is a bit small and made with common angles. I am 98% sure if DV gives these a touch up on the serdi with his angles they will actually beat the E7's at every lift point. Thanks, Charlie

[BILL-C]

Very nice workmanship.

[Carnut1]

Very nice workmanship.

Thanks Bill, being a fan of your cnc work that means a lot to me. I need to ship you something. Hopefully this weekend.

[Carnut1]

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Anytime someone wants to give me a Sunnen or Serdi I will make room but someone a bit ocd like me old school can be made to work quite well. Honed guides and close clearances on the tooling makes a huge difference. Tough to beat .000 valve seat concentricity. I wish they all ranout like this!

[Carnut1]

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Fairly accurate intake port sharpie curve. Notice the much less radical ssr vs. the cutaway, lower flows too.

[BILL-C]

Charlie: At your current knowledge level, if someone brought you a set of virgin 289 heads tomorrow and asked for the exact same porting job you have done on this project set, how many hours would it take? Cleaning, guides, and basic vj not included. Blending of seats and chamber work included through.

[Carnut1]

Charlie: At your current knowledge level, if someone brought you a set of virgin 289 heads tomorrow and asked for the exact same porting job you have done on this project set, how many hours would it take? Cleaning, guides, and basic vj not included. Blending of seats and chamber work included through.

Good question, much less hours now that I have figured them out a bit! I am slow, I will never win a race porting out a head vs. anyone. . If anyone EVER asks me to do up a set of these I will be calling you for a set of cnc heads to get a huge amount of the metal out before I touch them. I should ask, are you full service shop? Mill, remove and tap studs, etc?

[Carnut1]

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Fairly accurate exhaust port sharpie.

[BILL-C]

YES, we do it all.

[Carnut1]

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ported 289 specs

[Carnut1]

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test #1 289 heads 1.94"/1.6" thin lines
Test #2 E7TE heads 2.0"/1.6" thick lines.
I decided to post graphs against these two modified heads. These heads will battle it out on a nasty 306 shortblock. E7's are DV designed with some mods by me. The 289's are my design and one head was a cnc version donated by Bill C after I ruined one. The E7's have DV's special vj angles on a Serdi. 289 has more common angles done with Sioux stone equipment. First note how the E7's just dominate low lift flow. Hmm, this will be fun. 289's are a bit better on top. Exhaust the 289's win flow but have lower velocity. They do have a bigger exit than the E7's. My exit was nearly as big as the cnc exit. This is not the cnc head that I flowed today. It will be interesting which set of heads will make the best power. I think the E7's will win the small cam and the 289's will win on the larger cam. In reality each set of heads need a different cam!

[BILL-C]

The valve job has alot to do with your low lift flow numbers.

[Carnut1]

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cfm/sq in graph.
Test#1 289 thin lines
Test#2 E7 thick lines
Notice how DV special angles dominate flow to about .4".

[Carnut1]

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Port velocity graph
Test #1 289 thin lines
Test #2 E7 thick lines
Notice the exhaust on the 289's calcs up much faster than I measured center flange Pitot. I did notice how even the speed is throughout the flange 329 ft/sec at flange center slowest area 310 ft/sec at flange. E7's 344 ft/sec center flange. The 289 intake port lags on velocity throughout the curve.