Avg HP on 427 SO

[Cracker]

Keith8 - where's your sense of humor? I already proposed a test (that still can be done) using my motor. My builder ( and your customer) Garry Grimes built my motor and dynoed it so I have a baseline on ANOTHER dyno. Do the heads and with that being the only change I'll have Garry ( your customer and knows FE's quite well would be an understatement and also supports race teams) re-dyno my motor - same cam, compression, etc. it's all waiting for you. I'll pay for the re-dyno session and you take care of the heads - consider it "good" marketing - if they improve hp & tq. more than 15% which would equal 624 hp. That would be nothing more than a basic little 428 for ya'all. You want to shut up the naysayers take me up on it and the heads are in your hands within 7 days. If not alot of folks (not customers) are still stratching their heads. Either way have a great Memorial day weekend.

This can make the whole mess go away - or can it - you decide.

P.S. - If it works I'll be your biggest cheerleader - if it don't I won't!

[SCOBRAC]

Sorry friend,

The machining the heads will get you a few tenths. .2-.3 a copper head gasket will get you a couple more maybe, combined you might get 4/10's. These things are not without trouble. If you take too much off your heads you will have to machine the intake and or build up the manifold face.

I have a set of new Arias 13:1 pistons you can have reasonably cheap.

[Excaliber]

I wondered what the heck you were talking about.

A _ _ _ _ _ _ S?

.....now I get it.

[priobe]

Hello to all,
Final Dyno results have come back. First of all I would like to thank everyone for a ll their help and I did not mean to start any mis communication between anyone.
The motor was dynoed with a holley 4 barrel single plane intake.

The FE side oiler with the componets in the first thread minus the webers cam in at 551HP and 526 FT torque.

With all of the conversations going on I am gathering that I will have plenty of HP for my cobra.

If this is incorrect please let me , Thanks again to everyone.

Any other suggestions before I put the motor in?

[Cracker]

Congrats! That's impressive with that kind of compression and I stand corrected. 551 hp is absolutely plenty in a Cobra - now don't go killing yourself in it!

[priobe]

Thank you,
I will be safe, How much HP do you think I will lose from the webers. I will not have a chance to dyno the motor with the webers

[Cracker]

Regarding the switch to the Webers - I don't know. The general assesment around here would suggest an increase in tq. with a decrease in hp. A friend on this site has a stroked 427 center oiler (454 ci) built similiar to ours with webers and has 575 tq & 526 hp. with 10.5:1 compr. ratio. Even with the cubes he's way off your hp #'s and also a full point above yours in compression. If I were you I'd swap 'em out because the noticable difference will be minimal but with killer looks as an added bonus.

Here's a picture of my car with Webers from behind.

[SCOBRAC]

How about scanning that Dyno sheet for us and posting it in your galley with some photos???

[Excaliber]

The comparisons I've seen (Weber vs Holley) indicate substantial gains in both horse and torque below 5000 rpm, After that the Holley produces more horse.

[RICK LAKE]

PRIOBE With the weber set in the car and tuned correctly you should get a 20-30 hp and 30-40 lb of tork in the mid range. You should look at your exhaust system for back pressure. Cover the fenders well, slide the motor in and get it running Then go take it on a dyno and recheck the numbers. If you put the right numbers in the Dyno 2000 the numbers are pretty close, Mine was off by 8hp and 14 lbs tork. The real test is a 1/4 mile run. I hear all these huge numbers and have not see 1 cobra run 9's yet, THIS IS A STOCK BODY WITH NO 4 LINK suspension. 10.08 so far is the record, NO POWER ADDED EITHER. I run 12.5 with my motor. 360hp and 466 tork after exhaust and flywheel changes. Webers are the best till 6500 rpm, after that the single plane with a holley will past you by. Holley is easier to work on, Webers look alot better on the motor. Choice is yours Rick Lake

[priobe]

SCOBRAC

I will post the pics and Dyno sheet soon. I haven`t had much time to much because I getting married this weekend. But here is a website I put together. Its not much but its something.

http://www.cobra427.dns2go.com

Rick Lake
Thanks for the info I am definitly going to take your advise aand I think I will stay with the webers.

What did you mean about covering the fenders?

Also, if you ran 12's with the 360 hp I am figuring I should be around low 11`s possible 10`s ( I am just guessing)

What do you think?

[RICK LAKE]

Priobe If the car hooks up on the track, 11.1-11.4 118-124 mph. The fender covers are to protect the paint Good luck with the car, take it EASY in the beginning, THIS SNAKE can BITE YOU I sent you a private e-mail also Rick Lake

[rritchey]

I have attached a scan of one of my dyno sheets...

The motor is a '63 427 center oiler with 428 crank, .017" over, JE pistons 10:1 compression, Edelbrock heads mildly ported with CJ sized valves, mild solid flat tappet cam. It has lemans rods. Edelbroc Victor intake, Demon 950 CFM carb (too big, but that's what the customer wanted...). This is not an all-out race engine by any stretch... pretty basic build.

Max power was 553.9, max torque was 567.1. The numbers indicate the small size of the cam, as HP was lower than torque.

The scan is pretty dim, but if you view it in windows imaging you can zoom in on it and it is readable.

My shop is in Arkansas, but I use a dyno in Tulsa (also a Superflow)... maybe it's just the air here

[rritchey]

well, I tried to attache the sheet, it did not take with the thread, so I just plopped it into my photo gallery......

Seriously, you guys take a look at it and if you see anything fishy, let me know. I always check him (the dyno operator) on the temp, barameteric pressure and so on, and I check the fuel usage to tune the carb. This motor was a little heavy on fuel as I recall, but it really needed a 750 or 800 CFM, not that big toilet bowl 950.