Ported 915 iron heads flow #'s- Whatcha think

Posted By: 340man4ever

Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 04:38 PM

I just got back a set of ported 915's that I bought used. I had them freshened up, while the shop had them they threw them on the bench. What do you think?

Numbers are at 28"

.100 IN 74.4 / EX 57.9
.200 IN 148.9/ EX 99.9
.300 IN 208.9/ EX 135.6
.400 IN 268.9/ EX 170.3
.500 IN 258.2/ EX 191.9
.600 IN 262.9/ EX 205.3
.700 IN 258.2/ EX 207

These heads going on zero deck, stock stroke 440 with MOPAR 590 solid cam, worked over M1 single plane intake, 850HP annular booster carb, and pro parts big tube headers. Any comments?

What kind of power would you feel this would make?

Posted By: 67Charger

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 05:39 PM

You'll be looking at 450 - 460 HP. The heads are still going to be the cork in the system. I went from mildy ported 915's to Eddie RPM's out of the box and picked up 1/2 second. You've got plenty of cam and intake and well balanced carb. The duration of the cam should help the small ports, but just remember you aren't using it's full potential. What is your compression?

Posted By: Joshs68

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 05:54 PM

Im gonna say 525hp

Posted By: 340man4ever

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 06:06 PM

The compression will be 11.25:1

Posted By: Mr.Yuck

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 06:06 PM

good. I have 516's (2.14-1.81) They flow close to those... 260-190 I'll be running the 528 solid in a 440-6.

Posted By: TonyS451

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 06:36 PM

Those are some pretty good flowing 915's. That combo might make 550hp.

Posted By: JAKE68

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 07:34 PM

Almost exact same combo I went 11.42@118 in a 3800 lb. car threw muflers and with m&h street slicks. Jake

Posted By: Maximus_Wedges

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 07:54 PM

Thoes are good 915's. 915's are just not the greatest in this day and age as far as bang for the Buck (MHO). They'll be fine. I ran them on my 483 B stroker. MP 620 cam and a 950 Alky carb. They made power to about 5700 and peaked @ 550HP. TQ peaked @ 4000. Not enough head but run them if you got them.

Posted By: BDS871Cuda

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 08:04 PM

Quote:

Almost exact same combo I went [Email]11.42@118[/Email] in a 3800 lb. car threw muflers and with m&h street slicks. Jake

I see alot of guys running this combo. My 65 Fury
(4000 lbs) Line performance ported iron 452's.
Ultradyne .590-.613 cam, 825 race Demon, M-1 intake,
MSD, 440, car ran 11.16 at 118.
Your combo should make well over 550 HP.

Posted By: Supersonic

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/26/09 08:44 PM

I have 915 heads on my dart, fully ported and polished, it ran a 10.38 @ 127 last fall. It ran the best shifting at 6, at 6500 it only ran 10.50's

Posted By: fast68plymouth

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/27/09 12:52 AM

that combo should make 525-550hp easy.

Posted By: cudadoug

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/27/09 01:53 AM

FWIW - I had a 906's that had a flow sheet nearly identical to his and they went high 10.30s @ 128 on a TRW 440 shortblock with a small roller @ 3,240 lbs. In the dog summer days at Sac it would go .40's @ 127 like clockwork. Yea, it was a ladder bar car with a big tire, race converter, but the point is those "ol skool" heads did a good job.

With it hooking and a converter that's even close it should get in the 10's!

Posted By: 340man4ever

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/27/09 02:51 AM

The combustion chambers are presently 74cc giving me 11.25:1 compression. What kind of a gain would you anticipate if I milled them to bring it to 12:1. Would it be worth it? Would I be begging the heads to crack by doing that?

Thanks in advance

Posted By: Bigbeep

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/27/09 04:08 AM

Wow, Almost the same combo I have run the last 3 years. I run a set of 915's which are not completely hogged out, but do have the 1.81 2.14 valves. Same cam, same intake, 750 annular discharge holley, trw 11.5 slugs on stock rods, crane 1.6 roller rockers. SS springs, leaving with a brake. 10.644 with 1.401 60 ft. 122 mph in a 3335 lb a-body. Enjoy the trouble free combo.

Posted By: 383man

Re: Ported 915 iron heads flow #'s- Whatcha think - 03/27/09 06:12 AM

Quote:

that combo should make 525-550hp easy.

I agree with this. I run 906 heads I did some port work on myself on the mild 440 in my 63. I use the MP .557 cam and run 10.0 comp. That way it runs fine on 92 pump with the quench pad pistons I used. This has pushed my 3700 lb 63 to 11.50's @ 116 so far and I have yet to do any serious tunning on the car. I drive the car way more then I have raced it and the calculator I used says I push 475 to 500 hp so I see 525 to 550 in your combo. Go for it and have fun.

Ron

Posted By: 340man4ever

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 04:44 AM

Update- took completed engine to Dave Bruns (Mid America Racing Engines, Washington Ia) shop and had motor broke in and dyno tested.

Threw a Wilson Manifolds tapered 1.5" combo spacer under the carb for the tests.

Best ignition timing was 38 total.

Motor made 561 HP at 6200. Best torque was 520 at 4900.

Threw a 1050 Dominator w/ shear plate and small phenolic spacer on it for kicks.

Motor made 565 Hp and 517 ft/lbs.

We used Sunoco 110 for fuel, NGK plugs gapped at .035, and FireCore 50 plug wires.

Posted By: cudadoug

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 04:57 AM

Nevermind...

Posted By: JohnRR

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 10:25 AM

Posted By: Joshs68

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 10:43 AM

That's great! You may have to change your screen name now. Guess there is still a place for old school.

Posted By: HardcoreB

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 11:59 AM

Good job, that will be a good running motor!

Posted By: Chris_Holton

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 03:00 PM

I am doing a set of 915's right now. I havent ported old school heads in 10 years, now I have two sets to do, I will post results in a few days....

Posted By: Cab_Burge

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 06:43 PM

Quote:

I just got back a set of ported 915's that I bought used. I had them freshened up, while the shop had them they threw them on the bench. What do you think?

Numbers are at 28"

.100 IN 74.4 / EX 57.9
.200 IN 148.9/ EX 99.9
.300 IN 208.9/ EX 135.6
.400 IN 268.9/ EX 170.3
.500 IN 258.2/ EX 191.9
.600 IN 262.9/ EX 205.3
.700 IN 258.2/ EX 207

These heads going on zero deck, stock stroke 440 with MOPAR 590 solid cam, worked over M1 single plane intake, 850HP annular booster carb, and pro parts big tube headers. Any comments?

What kind of power would you feel this would make?

My comments, three things wrong, iron heads, Mopar 590 cam and annular boosters

Is this a race only or dual duty motor and car? If it is a dual duty, be careful on the fuel, the iron close chamber heads will detonate very easily with the wrong fuel and tune up

That being said I have used one of the older 590 cams one time

, that motor had "346" heads and is still running in a bracket car after six or seven yaers of being race 5 to 15 times each year on race fuel

good luck

BTW, I saw the same results on that bracket motor on the engine dyno testing a Carb shop custom 1050 Dominator with a tapered dominator adapter against a BG 850 Street Demon on a TM7 intake, we later switch the intake to a 4500 Team G intake and a stock Holley 9375 1050 Dominator and saw a 30 HP increase with the Team G intake and no adapter

Posted By: ademon

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/09/10 10:03 PM

Whats the problem with annular booster

Posted By: 340man4ever

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/10/10 04:58 AM

Cab- this is for a bracket drag car. It will see little if any street duty. I wanted to see what an old school "state of the art circa 1978" build could do. I consider myself a Mopar "purist" Good bad or indifferent, that was the thought process.......LOL

Posted By: rook440

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/10/10 05:09 AM

pretty good numbers .....cant wait to see it in the dart .....what year did you start building that engine ???? Do you like flat tappet cams ....??? this build and the day at the dyno really got me enthused ..... I still owe you one ,,,,,rook

Posted By: 340man4ever

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/10/10 05:18 AM

I started the engine build in 1978 LOL........

Flat tappet cams and iron heads will rise again....I can feel it.............

Thanks for your help, support and friendship Rook

Mr Looney

Posted By: 340man4ever

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/10/10 05:20 AM

If you owe me one......I owe you many...........

Posted By: rickstershemi

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/10/10 12:27 PM

Quote:

Flat tappet cams and iron heads will rise again....I can feel it.............

Yep, I'm excited to get going on our 318/390 Stroker Max Ported J-Heads, 11-1 Compression Tunnel Ram, Extremely Radical Hydraulic Flat Tappet Cam, 4-Speed

Rickster

Posted By: 340man4ever

Re: Ported 915 iron heads flow #'s- Whatcha think - 06/10/10 02:52 PM

Quote:

Quote:

Flat tappet cams and iron heads will rise again....I can feel it.............

Yep, I'm excited to get going on our 318/390 Stroker Max Ported J-Heads, 11-1 Compression Tunnel Ram, Extremely Radical Hydraulic Flat Tappet Cam, 4-Speed

Rickster

That sounds like a fun build up......

Very cool