390 on Dyno (video)

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sport71
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Re: 390 on Dyno (video)

Post by sport71 »

The jets were down sized, well that's what the shop told me. I'll call the engine shop on Monday, and ask exactly which pistons they were.
I can't get it through my head how much knowlage you guys have on the FE's.
With you alls help I know that my truck will run at its best for sure..
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Re: 390 on Dyno (video)

Post by Dragon »

Down sized to what and from what?
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Re: 390 on Dyno (video)

Post by sport71 »

Wow, 15 years is plenty of time so you can get to know what you can do with these motors. :thup:
It's so true about those cheep Chevys Gov. owned. :cry:
I think with what I've spent on the FE I would have a dragster Chevy motor, but I'd rather spend the extra and have a FORD. :lol:
hotrodfeguy wrote:What direction did the dyno tell you to go on the jetting?
Dragon wrote:Down sized to what and from what?
The jet size I have no idea, but when the first pull they said that it was running rich. I know that the sprayer was changed from 65 to 70, because on the chart it had a slight drop and back up on the curve. That's where they thought it needed more fuel, but even after the sprayer change it did the same thing.
I've also heard that the 650 double pumper is better, and can be tuned on all 4 corners, that it has 4 jets as well?
What good thing have you heard about these carbs?
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Re: 390 on Dyno (video)

Post by Dragon »

Don't double pump for the street imagine 4 mpg. All 4 barrels have 4 jets but only double pumpers have 4 idle jets and unless you are a tuning guru that is a headache you don't want.

They are great for an engine that must go from an idle to 7000 in .5 seconds in 1st and never have the throttle lifted for 9 sec.

What is a sprayer? Jets come in those numbers but power valves and pump nozzles don't so I assume jets. A 70 jet would be richer than a 65 jet. And raising the jet size if the engine lost power in the middle of the band and not at the top end would make sense. Though the power valve could help middle of the band power if it's flow rate was not maxxed out.

That myth is wrong you can build a small block cheby that has to wind to 7000 to get the power we pull at 4000 for less than a 7000 rpm FE, You cannot build comparable power at the same RPM for less.
i can build an FE for 1000 that pulls 450 ft lbs of torque at 3500 rpm and I have built RAT Chevies (BB) for 1000 and did not get 450 ft lbs until 4100. I put over 2800 into a 396 SS Camaro to run GTC class. It did 160 but only 12 secs in the quarter and I put 800 in a 68 F100 SWB 390 and did 140 and 11.21 in the Quarter without the benefit of the Camaro's aerodynamics.

Rods are more pricy and intake manifolds but that is the main things.
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71 F250 with Shell Car 390 NP435 Dana 60 3.73s, PS, PB, 750 EC VS Holley Accel Points Eliminator.
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Re: 390 on Dyno (video)

Post by sport71 »

I don't need a double pump then.

They changed something in the bowls?

The ones that are where in the choke flap were the 65 and 70.
I wouldn't know why they would tell me change to bigger if it was running rich?

You show some impresseve #'s on the FE. I wish you were my neighbor to swing some wrenches.
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Re: 390 on Dyno (video)

Post by Dragon »

They change the metering block on the rear to a front style without a power valve hole.

Oh and that is engine numbers not rear wheel. The secret is not what cam or outer part you put on it is all the tricks inside the motor how true the crank is to the block and the rods that are true and not slightly out of round and twisted. The list of the little things is huge but imagine a crank with no rods on it. Most guys have to put a wrench on their crank to turn it.

i spin mine by hand or I find out why. Are all the pistons the same OD and all the bores true top to bottom. It all adds up to freed up Horsepower.
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Re: 390 on Dyno (video)

Post by sport71 »

I just started to take apart the top end of my motor. To port match the heads to the intake. I ordered 3 different sets of intake gaskets (why? different size ports) I hope that it frees up the air flow some, and get more horse power. I don't know what else to do. I was also thinking of getting the LUNATI 30507 cam. I just got the Isky cam because it said it was biggest for the stock converter. huh. I'd rather take advice from the expirianced this time around.

What is the most lift that the stock adjustable rockers can handle? I bought the stands, end stands, & spacers, along with a stronger shaft. Now my ? is. Will the LUNATI 30507 cam work for my aplication?
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Re: 390 on Dyno (video)

Post by DuckRyder »

Here is a link to the cam, for those that might not be familiar.

http://www.lunatipower.com/Product.aspx?id=2279&gid=279

.600 is a lot of lift, honestly I'm not sure if the stock adjustable arms will do it or not...

You might have a look at some of the Crowers...
Robert
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Re: 390 on Dyno (video)

Post by Dragon »

Srock adjustable rockers pull .625. Now that is true 1967 427 rockers I bought in 1970 and used in several engines until 1982.
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Re: 390 on Dyno (video)

Post by hotrodfeguy »

Yea they work(rockers), I run the 30507 in my 64 Fairlane granted I run the 351CJ convertor(factory 10" http://i146.photobucket.com/albums/r264 ... 270300.jpg )3.00 gears have 3.70's just havent put em in. The weak link valvetrain wise is the end of the shaft, end stands are manditory with this cam. But you have that issue taken care of. The stock rockers are holding up fine. You will love this cam :thup: and will work with that intake and carb.
Last edited by hotrodfeguy on Thu Jan 28, 2010 9:54 pm, edited 1 time in total.
1972 F-250 4X4 390
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Re: 390 on Dyno (video)

Post by DuckRyder »

Well then,

Yes, it is a much better match for the rest of your hardware and you should get appreciably better results...
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Re: 390 on Dyno (video)

Post by sport71 »

Great, I'm glad that I don't have to buy the Harland Sharp rockers. I can't wait to order this cam. Thanks guys, I'll let you know the progress as I go.

hotrod, that monster c6 converter makes the factory 351CJ look so small. I bet that it helps make more horse power to the back wheels.
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Re: 390 on Dyno (video)

Post by hotrodfeguy »

Yea under 2k the 30507 is a real turd it takes that lag right out of it. Kinda makes up for the 3.00 rear gears too. That would be the next step for you is get a convert in there after.
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Re: 390 on Dyno (video)

Post by DuckRyder »

I thought he already had a 2500 converter?

Am I mixed up with someone else?
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Re: 390 on Dyno (video)

Post by BobbyFord »

I hope the guides were cut to accomodate .600 lift.
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