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Re: 360 horsepower
[Re: goldmember]
#842356
10/31/10 12:29 AM
10/31/10 12:29 AM
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Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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What compression ratio, that is critical (to guess is pretty useless, has to be measured to accurately figure horsepower). If you have stock style dished pistons, close to .10 below deck, your compression ratio will be about 8:1 at best, and your hp would be 330 or 340 hp.
Last edited by GO_Fish; 10/31/10 12:32 AM.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: 360 horsepower
[Re: 2boltmain]
#842359
10/31/10 02:22 PM
10/31/10 02:22 PM
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Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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You are dead on that the info given is vague. The potential low compression will kill the bottom end and make a pooch out of it,with enough converter and gear it may run well enough for the op. That cam is close to 250@.050 and very long seat to seat. Yes, I have run combos like this 20plus years ago and they are not close to ideal.
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Re: 360 horsepower
[Re: MoparforLife]
#842362
11/01/10 02:52 PM
11/01/10 02:52 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
So many here seem to under estimate the output of the 360 and I don't know why. My own experience and that of others around here find that it really don't take much to really wake them up even with stock type pistons. The last one I built was .030 over with 485/495 cam with 271/284 advertised duration, 750 Holley and 4.30 gear and 29.5 slick and it would run low 12's all day in the Duster. Many of us have built many of these engines and found like I said it don't take much even with stock pistons. Lotsa low buck builds around that would surprise a lot of you. Both big and small block. 
 but I also think a 509 is way too big with that low of compression. headers, an LD340/RPM/air gap intake,
a 750-800cfm carb, a good valve job, and something like a comp XE268 will be an honest 340-350ish HP. with the low compression, it'll be soft on the bottom end, and will probably want a 3000 RPM stall converter to really wake up.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 360 horsepower
[Re: goldmember]
#842364
11/01/10 04:15 PM
11/01/10 04:15 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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I was running an out of the box stock LD4B at the time. Stock heads with no porting or gasket matching done.
Clean it, if it's Dirty. Oil it, if it Squeaks.
But: Don't fix it, if it Works!
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Re: 360 horsepower
[Re: MoparforLife]
#842367
11/01/10 05:42 PM
11/01/10 05:42 PM
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Joined: Jul 2003
Posts: 4,768
Holland MI Ottawa
2boltmain
master
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master
Joined: Jul 2003
Posts: 4,768
Holland MI Ottawa
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A few years ago I pondered if I really needed new pistons for my 360 project. Id like an honest 350-370 crank hp. I read that many achieved this power level with oem smogger pistons. In the end I did buy a new set of KB107s. They are advertised as a 10:1 piston. I paid $150 for them- brand new but from a moparts member who changed projects. I know the 275hp 340 ran so much harder than the 360 that replaced it and the most significant difference was the piston height.
Keep old mopars alive.
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Re: 360 horsepower
[Re: dgc333]
#842370
11/03/10 06:03 PM
11/03/10 06:03 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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Quote:
Just add a point of reference to this discussion. My 360 is 30 over with . I have stock magnum heads and run a Comp XE268H cam (224/230 @ 50, .509/.512 lift with the magnum 1.6 rockers). I have a high rise dual plane intake, 600 CFM vac secondary holley, 1 5/8 headers, A833OD and 3.55 gears.
This combo is making approximatley 370 HP based on 102 mph trap speed.
The key phrase: zero decked KB107 pistons
That makes all the difference.
If he's running a 509 cam and low compression, it's going to be a PIG. Without compression and a matching intake that cam won't do anything but make him beat his head against the wall.
I remember running a MP 509 cam in my 8:1 440 with a Performer intake. It was horrible. The car had trouble doing a burnout with the stock converter. Once the engine was over 3000 rpm it would start to pull. The intake held it back on the top end.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: 360 horsepower
[Re: dgc333]
#842371
11/03/10 06:50 PM
11/03/10 06:50 PM
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Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Unless that Abody weights 4500lbs it should run alot more mph if it's making 370hp. When I ran 110mph@3100lbs with a 268he cam and pistons a mile in the hole I guessed it made 325hpish,seems close. what hp would it take to run 107mph @3500lbs? I'd guess 360ish? Maybe I need a better calc.
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Re: 360 horsepower
[Re: goldmember]
#842372
11/03/10 07:15 PM
11/03/10 07:15 PM
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Joined: Nov 2004
Posts: 2,495
Oregon City, OR
Baxter61
top fuel
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top fuel
Joined: Nov 2004
Posts: 2,495
Oregon City, OR
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Quote:
Unless that Abody weights 4500lbs it should run alot more mph if it's making 370hp. When I ran [Email]110mph@3100lbs[/Email] with a 268he cam and pistons a mile in the hole I guessed it made 325hpish,seems close. what hp would it take to run 107mph @3500lbs? I'd guess 360ish? Maybe I need a better calc.
At 3500 lbs it takes close to if not over 400. I was running 103 at 3550 and according to the wallace calculator I was right at 360/370 if I remember correctly.
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Built and seen built many 360 with stock dished pistons small 265 470ish & lift cams & 1.88 valve heads, (2.02 didn't do a thing in our trials in fact the 1.88 gave/gives more low end) cars in full street trim with 3.91 gears run at least a half second quicker than the stock 340's of the era. (By the way I was there and owned them)
