Author Topic: Basic 390 on the dyno - Edelbrock heads and 270H cam  (Read 5532 times)

My427stang

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Re: Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #8 on: May 04, 2013, 11:50:46 AM »
I did my F100 4x4 stroker with a 270H and although I didn't dyno it, it's a nice street motor for a street truck, gal, or tall geared ride.

Mine is 10:1 445, 270H on 110 ICL, ported iron heads that slightly outflow the Edels and a worked RPM with a 3310.  It pulls very hard up to 5000 or so and despite having a nice chop at about 800 rpm, is very mellow.  I run a 4 speed, but wouldn't hesitate putting that combo behind a C-6.

With that being said, add cam, add power, but it is a very nice engine if you want to keep things mellow

1970 Mustang Fastback, 489 FE, SEFI, TKO-600, 4.11s
1971 Ford F-100 SWB 4x4, 445 FE, 3310, 4 speed

cayenne06

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Re: Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #7 on: May 03, 2013, 10:04:16 AM »
Going to drive her this summer and maybe pull the engine in the winter and give her a stroke. I am like cdhowell and need the vacuum to run my accessories so a bigger cam is probably not the answer since my son and I are just cruising with this car. It will probably never see the track. I think your prison break would do the trick.

Barry_R

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Re: Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #6 on: May 02, 2013, 09:19:47 PM »
The Edelbrock RPM cam is pretty big compared to a 270H.

RPM   is 236 @ .050, 108 LSA, and .572 lift
270H  is 224 @ .050, 110 LSA, and .519 lift

That's a big piece of the difference - and the Ed stick would not be as street oriented for sure....

cayenne06

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Re: Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #5 on: May 02, 2013, 09:44:25 AM »
Interesting. That is almost the exact build I have in my 69 S-code mustang except I am using a 428PI intake (to fit the shaker), FPA tri-ys, and MSD Atomic efi. Now I know why the engine just doesn't move the car the way I want. According to Edelbrock their RPM kit for this car makes over 400 hp and over 430 ft/lbs torque, which is what I was hoping for. Looks like I may need to stroke it to get the performance I want.

Barry_R

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Re: Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #4 on: April 18, 2013, 04:36:33 PM »
I would expect around 415-425 horsepower and around 500 TQ.
Plenty of vaccuum.

cdhowell

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Re: Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #3 on: April 18, 2013, 01:36:54 PM »
What kind of numbers would you expect by adding the 4.25 stroker kit to this motor? Looking to put something together soon to move a 4600# 64 T bird reliably down the road. Should see a lot of high way use.  Approximately how much vacuum at idle?

63.5zCode

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Re: Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #2 on: April 09, 2013, 03:36:14 PM »
Thanks for posting this; the level of mods looks like what I would hope to spec when I get to my project someday; though your heads seem so much cooler.
Kevin
Late 63 Z-code Galaxie 500 Sport Coupe, 390, 4 speed, Rangoon Red, white top, black interior,.  Dad bought it new 7/30/63.  Trying to learn here while saving up for its second engine rebuild.   Still runs pretty well though.

Barry_R

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Basic 390 on the dyno - Edelbrock heads and 270H cam
« Reply #1 on: January 25, 2013, 10:25:42 PM »
Have you ever wondered what a "normal" street 390 would do if you added the traditional modifications?  We just buttoned one up that answers the question pretty nicely.

Its a basic .030 over 390 with Speed-Pro flat tops, Edelbrock heads with no modifications, a Performer RPM intake, a 270H Comp hydraulic cam (224@.050, .519 lift on both sides), and a Holley O-3310 vacuum secondary 750 carb.  Stock replacement oil pan, non-file-fit rings, Duraspark distributor.  Nothing wild, nothing trick - just a good clean bolt together balanced assembly with good machining.  Marc did port match the intake...  You can definitely build this one in the garage.

Fired it up, broke in the cam, and ran it.  No drama, no problems, oil filter was spotless clean.  Had a nice idle at around 800ish with a bit of chop.  This will make for a very, very nice street engine. 

Power numbers were actually quite decent with a torque peak of 412 pounds at 3400.  It's worth noting that the torque was over 405 at 2900 and stayed above 390 though 4900 - a very smooth and solid curve.  Horsepower peaked at 4900 RPM with 364, but followed with a little return bump to 363.5 at 5500 before trending downward "for good".  Numbers were reached with timing at 38 total, and jets in the Holley pulled down 3 steps to 69s in the primary.  Air/Fuel ratios were surprisingly smooth considering the basic carb - trending between 12.6 and 13.2 - with a brief 13.4 bump just as the secondaries were about to/or started to open.

Pictures, charts, and the obligatory YouTube link follow:





http://youtu.be/dXPaAkaPBAM