Moparts

440-1: leave ports in stock form?

Posted By: 426keith

440-1: leave ports in stock form? - 01/08/09 06:19 PM

Hi,
just bought a set of 440-1 heads and realized that the intake ports look not very smooth on the port entry. Is it worth the time smoothing this edge for better flow or are there only little to no gains by doing this?
They are going on my 500cui for 70% drag. Motor gets a Scott Brown 650" lift roller cam and should rev to 7000.
Any ideas are appreciated.
Chris

Attached picture 4932853-P1010083.JPG
Posted By: B G Racing

Re: 440-1: leave ports in stock form? - 01/08/09 06:39 PM

I would blend the port the runner entrance.The best thing is to bowl port below the valves for some extra power.
Posted By: blownzoom440

Re: 440-1: leave ports in stock form? - 01/08/09 06:48 PM

do you have a die grinder?
get a sanding cone attachment 300grit paper and smooth what you can,take your time.fuel can collect on the rough casting and not be attomized.
if not you will get by with the way it is.it is just not the best it can be.
Posted By: gregsdart

Re: 440-1: leave ports in stock form? - 01/08/09 07:47 PM

With minor bowl work i went 9.54 in my dart at 3000 lbs, 499 cubesb with a roller, 12.8/1 compression, and a dominater 9375. So you should see similar performance if you put just a bit of work into the bowls as suggested.
Posted By: Lil Demon

Re: 440-1: leave ports in stock form? - 01/09/09 12:15 AM

Quote:

With minor bowl work i went 9.54 in my dart at 3000 lbs, 499 cubesb with a roller, 12.8/1 compression, and a dominater 9375. So you should see similar performance if you put just a bit of work into the bowls as suggested.



Similar - 511 ci, 3160lbs, box stock -1s, tunnel ram, twin 9375 doms - 9.38.
Posted By: griff70440

Re: 440-1: leave ports in stock form? - 01/09/09 01:04 AM

Quote:

With minor bowl work i went 9.54 in my dart at 3000 lbs, 499 cubesb with a roller, 12.8/1 compression, and a dominater 9375. So you should see similar performance if you put just a bit of work into the bowls as suggested.

Quote:

Similar - 511 ci, 3160lbs, box stock -1s, tunnel ram, twin 9375 doms - 9.38.










how much E.T would you guys pick up with fully ported -1s?

mike

Posted By: Bob_Coomer

Re: 440-1: leave ports in stock form? - 01/09/09 01:10 AM

I picked up a half second after the heads were CNC ported.
Posted By: griff70440

Re: 440-1: leave ports in stock form? - 01/09/09 01:15 AM

thats what I wanted to hear!I ran a 9.30 with rpm`s on a 511.I`m changing the heads to a pr 345cnc -1s.I hope to get into the 8`s


mike
Posted By: Ari440

Re: 440-1: leave ports in stock form? - 01/09/09 01:21 AM

Quote:

thats what I wanted to hear!I ran a 9.30 with rpm`s on a 511.I`m changing the heads to a pr 345cnc -1s.I hope to get into the 8`s


mike



what dos the car weigth , cam , gears and slicks
Posted By: griff70440

Re: 440-1: leave ports in stock form? - 01/09/09 01:31 AM

2750 car
33.5-16-15 tire
456 gear
700 roller
Posted By: 426keith

Re: 440-1: leave ports in stock form? - 01/10/09 01:48 PM

Thanks guys,
I will disassemble them and give the a treat with the die grinder. CNC is out of my budget, but smoothing everything, especially the bowls I can do myself.

What is best protection for the valveseats when grinding the bowls except not to contact them with the grinder?
Posted By: blownzoom440

Re: 440-1: leave ports in stock form? - 01/10/09 01:57 PM

Quote:

Thanks guys,
I will disassemble them and give the a treat with the die grinder. CNC is out of my budget, but smoothing everything, especially the bowls I can do myself.

What is best protection for the valveseats when grinding the bowls except not to contact them with the grinder?


take your time by the seats!using a short extension with sanding cones will be more stable and wont chatter on you with a slower rpm.maybe put tape on the seat.
Posted By: Hot 340

Re: 440-1: leave ports in stock form? - 01/10/09 03:00 PM

Quote:

Thanks guys,
I will disassemble them and give the a treat with the die grinder. CNC is out of my budget, but smoothing everything, especially the bowls I can do myself.

What is best protection for the valveseats when grinding the bowls except not to contact them with the grinder?

Dont start the grinder till the cutter/drum is below the seats in the bowl. Make sure also to have the right cutter. And for Pete's sake dont let a $1000 head be the first thing you practice on.
Posted By: 426keith

Re: 440-1: leave ports in stock form? - 01/10/09 03:20 PM

Yes, tape I did use the last times I ported heads. Just wanted to hear how you guys protect them.
Thanks for helping,
Chris
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