390 on Dyno (video)

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DuckRyder
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Re: 390 on Dyno (video)

Post by DuckRyder »

True,

I think we are all assuming "hot rod - weekend plaything", but we probably shouldn't be assuming...
Robert
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Re: 390 on Dyno (video)

Post by Dragon »

I mean radical play toy healthy sound good on street would not hill climb worth a D... So the data is needed. I had my 4 mpg Mustang be my everyday car but premium in 1970 was 16 cents a gallon.
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Re: 390 on Dyno (video)

Post by sport71 »

No turning back now.
What I want is a motor that will smoke the tires, and take off like a bat out of hell when I pounce on the gas."hot rod - weekend plaything"

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I noticed alot of black on #3, do you think it was burning oil or was the gas to rich? or is it normal?
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It does have eyebrows on top and bottom, and the numbers you asked for are:
L2291F 040
199-07-11-B
If that helps.
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Re: 390 on Dyno (video)

Post by DuckRyder »

Forged Flat top speed pros! That is good...atleast for compression... :woohoo:

With a piston at top dead center is the pistons top level or below the deck and if below can you measure how far.
Robert
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Re: 390 on Dyno (video)

Post by sport71 »

Now for the port matching
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Re: 390 on Dyno (video)

Post by DuckRyder »

On the port matching, I would do no more than try to match the head and intake ports to each other, don't lower the port floor to match that gasket, it creates a dip (the factory Cobra Jet port is that way) in the tract and is thought to be bad...
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Re: 390 on Dyno (video)

Post by Dragon »

Looks like oil on #3 and as for weekend toy we have been steering you in the right directions with cam and piston ideas. As Mr. Duckryder says don't port match the bottom. As fuel comes down the port it will fall over that edge and create fuel suspending turbulence with a ledge. Without a lip the the depression will cause the air fuel mix to slow down.

Above 7000 in Hemis and FEs we always left the top and bottom intakes lips exposed to hold the fuel air mix down by the valves because the intake tract is so long the pulses get out of sync and lean the motor. The sides always get match but not to the depth that is causes a side depression.
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Re: 390 on Dyno (video)

Post by sport71 »

MAN! I got ahead of my self, thinking I was doing the right thing by marking the ports with the gaskets and then cutting. I should have waited. :doh:


Did I just mess up this head?

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Re: 390 on Dyno (video)

Post by Dragon »

It is the intake side you want to leave the lip on. The head side is okay as the air is flowing down to the head you just want it to see a lip after the air hits a closed intake and bounces back.

Take that bottom floor in a little farther so the transition is clean (smoother ramp). I ported enough FEs, Rats and Hemis that I would trash my die grinder once every 6 months. :lol: See you have that ramp going up and if it tapers a little less it will help the breathing.

Behind the valve heads if the casting sticks out beyond the seat into the hole remove that lip and just barely round it off. That is the area that they call the bowl.

Check out this head data. What is your head numbers betweent the 2 center spark plugs?

http://users.erols.com/srweiss/tablehdc ... _Big_Block :woohoo:

Really you are okay on the head side.
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Re: 390 on Dyno (video)

Post by sport71 »

I cut down further to the back to minimize the dip and it turned out alot better.:pray:

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Re: 390 on Dyno (video)

Post by Dragon »

Yes it did that makes for a nice velocity increase.
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71 F250 with Shell Car 390 NP435 Dana 60 3.73s, PS, PB, 750 EC VS Holley Accel Points Eliminator.
98 Volvo S70 2.4T Auto
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Re: 390 on Dyno (video)

Post by sport71 »

The pistons are flush, and the number on the thumb print is 25 (C8AE-H)

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Re: 390 on Dyno (video)

Post by Dragon »

Was the PVC valve hooked to the vacuum port on top of #3 intake runner?

C8AE-H heads are just about the most generic heads there are. Do you have hardened seats in the heads yet. That is mandatory for unleaded fuels.
Old Fords Rule
Was a Ford Service Tech
71 F250 with Shell Car 390 NP435 Dana 60 3.73s, PS, PB, 750 EC VS Holley Accel Points Eliminator.
98 Volvo S70 2.4T Auto
71 Service manuals Volumes 1,2,3 and 4 So ask away. :)
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Re: 390 on Dyno (video)

Post by Dragon »

Clean the antifreeze out of the bolt holes before rust builds up.
Old Fords Rule
Was a Ford Service Tech
71 F250 with Shell Car 390 NP435 Dana 60 3.73s, PS, PB, 750 EC VS Holley Accel Points Eliminator.
98 Volvo S70 2.4T Auto
71 Service manuals Volumes 1,2,3 and 4 So ask away. :)
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Re: 390 on Dyno (video)

Post by sport71 »

Dragon wrote:Was the PVC valve hooked to the vacuum port on top of #3 intake runner?
No it was hooked up to the carb.

Dragon wrote:C8AE-H heads are just about the most generic heads there are. Do you have hardened seats in the heads yet. That is mandatory for unleaded fuels.
The heads do have heardend seats, and I see that the valve stems look grooved. The springs are suposedly the good ones.
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