Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: 440Jim]
#2913625
04/22/21 08:25 PM
04/22/21 08:25 PM
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Joined: Jan 2003
Posts: 31,203 Oregon
AndyF
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I Win
Joined: Jan 2003
Posts: 31,203
Oregon
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More stall might be a good idea but the stall speed will increase naturally from the extra torque so I'd try it first.
I agree with the trend, so the converter company will make use of the extra data. But I still think that "small 446" CID and long 284 deg @.050 duration will want high 5 grand stall speed for best perf. Now I am coming from 500+ CID experience... I agree with you but I'm wondering if that 446 engine really needs 284 duration. My guess is that the car would be faster with a smaller cam. The OP might not want to spin that 446 high enough to make use of the 284. If I was building a 446 with those heads and a solid roller I'd probably be 10 degrees smaller if not more. My 470 ran best with 264/268 and that was with MW heads and a ported intake. I didn't have as much compression so with more compression the cam can be a bit bigger. If the cam was smaller then the torque converter might be okay as is. I just ran a 565 inch BB Chevy on the dyno with a 284 cam. It was a full race setup with 14:1 compression, CNC heads, Dart block, etc. It made 900 hp at 6500 rpm. Makes me think the OP's cam is too big.....
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Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: Moparrob68]
#2913728
04/23/21 12:28 AM
04/23/21 12:28 AM
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Joined: Dec 2006
Posts: 4,648 aotearoa
rebel
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master
Joined: Dec 2006
Posts: 4,648
aotearoa
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Rebel, are you spinning that 455 to 8000 with a stock block? I've been trying to keep the rpm under 7000 to make the tall fill,Hughes girdled stock 440 live. No, I'm using a low deck Maxx block. I have a 512 with a stock block I rev to 7k, but has a BCR girdle kit to keep it together.
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Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: Moparrob68]
#2913786
04/23/21 09:43 AM
04/23/21 09:43 AM
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Joined: Jan 2003
Posts: 16,936 NC
440Jim
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I Live Here
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NC
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I sent the old Reed cam out to Bullet and had it reground wit 276*/279* dur .670 lift with 1.6 rocker ratio. Do you think that cam would perform better in this combo or will the ported heads like the 284 cam.
I hate to say change too many things at once (heads and cam), but since you want to keep the RPM below 7000; I think the 276*/279* dur .670 lift would be a better fit. More torque to improve the sixty foot time and work with the existing "low" stall converter better. Still think a high 5k converter is the right thing to have at the end of the day (month, year, etc.). It has been a long time since I raced less than 493 CID, but that sixty foot seems slow for a 2950 lb car with a 3-speed transmission. Or is it a PG with 1.76/1.80 first gear?
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Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: Moparrob68]
#2913792
04/23/21 09:51 AM
04/23/21 09:51 AM
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Joined: Nov 2004
Posts: 3,547 Syracuse,NY
CompWedgeEngines
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master
Joined: Nov 2004
Posts: 3,547
Syracuse,NY
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Quite simply, I wouldn't do a thing. I'd go run the car, get a timeslip, then, the incrementals on that slip, will tell you everything you want/need to know. You can then adjust with data. This is the old ask 100 people, and you'll get 130 answers.I am sure you will need to make changes, but I wouldn't just guess.
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Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: CompWedgeEngines]
#2913797
04/23/21 10:12 AM
04/23/21 10:12 AM
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Joined: Aug 2005
Posts: 4,114 Yes
sixpakdodge
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master
Joined: Aug 2005
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Quite simply, I wouldn't do a thing. I'd go run the car, get a timeslip, then, the incrementals on that slip, will tell you everything you want/need to know. You can then adjust with data. This is the old ask 100 people, and you'll get 130 answers.I am sure you will need to make changes, but I wouldn't just guess. I agree 100%. I personally don't see the need for more converter or more gear. It's a bracket car, no sense in killing the motor with rpm that you don't have to. I am sure it will run quite well.
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Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: CompWedgeEngines]
#2913824
04/23/21 11:16 AM
04/23/21 11:16 AM
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Joined: Jan 2003
Posts: 13,496 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: justinp61]
#2913905
04/23/21 01:04 PM
04/23/21 01:04 PM
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Joined: Aug 2005
Posts: 4,114 Yes
sixpakdodge
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master
Joined: Aug 2005
Posts: 4,114
Yes
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I agree 100%. I personally don't see the need for more converter or more gear. It's a bracket car, no sense in killing the motor with rpm that you don't have to. I am sure it will run quite well.
A buddy of mine runs a 499 or 500" wedge in a tube chassis bracket car, smallish solid roller with good springs. It runs 5.70's or so shifting at 6400 and lives long trouble free lives. Exactly. The 528 in my Omni-Charger went 5.65-5.70 shifting at the same rpm. It has -1's, bowl ported (330@ .700), .693 roller, 1.76 Glide, and a 4.10 gear. Car is 2500 with me in it. I can't remember the Duration or Cam CL, but it is a fairly mild grind.
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Re: Indy Heads back from porting, Guess on HP/ET Gain?
[Re: 440Jim]
#2913937
04/23/21 02:16 PM
04/23/21 02:16 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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I’d put it back together with the Bullet cam.
I built a RB451 several years ago....... 13:1, SR heads with MW openings that flowed in the 340’s, port matched 440-3, 272@.050/.650 lift cam, 1.5 rockers. Made peak tq at 5500, peak hp at 7200.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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