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Old 01-14-2003, 05:05 PM
abe abe is offline
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Post How much power do u think?

Ok guys. Give me some feed back. I need to know how much horsepower and torque my engine makes? Here is the specs big block chevy 396 bored 40 over to 404. 4 bolt block cast crank cut 10/10, GM recondtioned rods, on TRW 2240 forged pistons( stock factory 10 to 1 compression using closed chamber haeds) moly rings and balanced. Heads are fresh from machine shop.They are oval port casting # 3999241 . with 113cc open chamber and mild pocket porting, stainless steel valves with undercut stems. double roller timing set, comp cam 256 extreme energy cam kit. 480" lift intake and 485" lift exhaust. And has 2.06 intake valve . Yeah i know small cam. Magnum roller rockers, edelbrock performer 2-0 dual plane intake, edelbrock 750 CFM carb with electric choke, stock fuel pump, stock igntion but new coil all good shape runs perfect and small 1 5/8" primary tube headers which i will change later. Ok guys let me know what u think its making? My goal was torque, reliability and fuel economy(thats why i have small cam). Thanks for your input guys.
I believe my compression now is between 8.5 and 9.1 because i am using open chamber heads. So its not 10.1 guys. Sorry about that information left out.
[ January 14, 2003: Message edited by: abe ]

[ January 14, 2003: Message edited by: abe ]

[ January 15, 2003: Message edited by: abe ]</p>
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Old 01-14-2003, 05:15 PM
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This may not be too accurate, but according to my desktop dyno you should be making these #s at these rpms.
402hp @ 5000 RPM
441torque @ 2000 RPM
463 @ 4000 RPM

Those numbers are at the flywheel and not at the rear wheels
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Old 01-14-2003, 07:16 PM
abe abe is offline
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Thanks swoodard. My goal is 360-400 HP and 430-470 ft lbs torque. And its just an estimate on this set up. Any more response will hlep guys. Thanks
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Old 01-14-2003, 07:17 PM
abe abe is offline
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Thanks Swoodard. My goal is 360-400 HP and 430-470 ft lbs torque. And its just an estimate on this set up. Any more responses will help guys. Thanks
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Old 01-14-2003, 07:32 PM
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I got on Desktop Dyno 443hp @ 5500-6000 rpm and 448 torque @ 4500 rpm at the flywheel
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Old 01-14-2003, 08:29 PM
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keep those dynos and guesses coming guys.
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Old 01-14-2003, 09:21 PM
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using Dyno 2000 i don't know what kind of carb your running so:
660 cfm - 392 hp @5000
439 lb-ft @ 4000

700 cfm - 393 hp @ 5000
441 lb-ft @ 4000

*using a dual plane intake manifold
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Old 01-14-2003, 09:25 PM
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Hi,
Depends how your heads flow, I have the entire range of comp cams for desktop dyno but I found it pretty hard finding flow numbers for big block heads so I've chosen a pretty average decent aftermarket stock one, which your pocket ported ones should be similar to, the GM replacments are close to this too, 8.75:1 Compression, 2.19/1.880 valves, 296 +0.40

RPM Horsepower Torque
2000 174.906967 459.130798
2500 219.710144 461.391296
3000 263.595276 461.291718
3500 307.579193 461.368805
4000 348.232544 457.055206
4500 381.538116 445.127808
5000 399.191376 419.150940
5500 396.497803 378.475159
6000 378.762573 331.417236
6500 351.324860 283.762390

Plus you'll be gaining more from the roller rockers so you should really be just a smidgen above 400 hp
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Old 01-14-2003, 10:43 PM
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thanks guys for your work i really appreciate it. i left out some small details on my post. feel free to go and check it again so u can have everything u need to know just in case u need too. thanks guys
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Old 01-15-2003, 01:58 AM
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i think you should be makeing something in the 400-420 range the 1970-72 mid chamber ovalports are a one of the best big block heads to ever leave GM, but you are loosing out on low lift flow by not running 2.19/1.88's
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Old 01-15-2003, 08:57 AM
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Thanks duece. I was going to put the 2.19/1.88 valves in place of the 2.06/1.72 which i have on now but the machine shop said it was going to be a lot of money so i had just bought the best valves money can buy. Heck every little bit helps.
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