Horsepower estimate??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

short69 · 04-05-2007, 12:45 AM

I just got my engine back from the shop and was wondering if anybody knew how to give it a ballpark estimate as to how much power it's packin based on the the stuff thats on it.I dont know all the specs, but I do know its a ....
400 small block bored 40 over(408)
World cast iron heads...Chamber size unknown to me
Comp cam 218/226 duration at.050-----462/480 lift
aluminum roller rockers
Edelbrock rpm air gap intake
holley 750cfm

Thanks.

RACINJASON22 · 04-05-2007, 12:52 AM

World cast iron heads...Chamber size unknown to me. Find this out and we can get alot closer and maybe crunch some better #'s. I would venture a educated guess at respectable 425to450 hp depending on quench and better head info. Like I said just a fair stab at this point.

manimal · 04-05-2007, 12:54 AM

I had a 383 with the same setup,and it was desk topped at 393hp 430lb ft. I used Sportsman II's. So my guess would be around the same. That cam will be milder in a 400 than a 383. PM Billa, He can do a desk top dyno for you, and he does an awesome job.
-Lance

RACINJASON22 · 04-05-2007, 12:57 AM

Billla is good with that deck top dyno from what I have heard. 400 will pull a few more ponies but not alot. Get the head info for him though to be more acurate. The came will feel milder but not perform milder.

short69 · 04-05-2007, 01:00 AM

thanks a bunch! Yea I gotta call the shop to see if they measured the combustion chambers... its also got flat top pistons if that matters.

RACINJASON22 · 04-05-2007, 01:02 AM

The more info you can provide the more acurate the outcome will be. Deck height, head gasket used ect. ect. the more the better.

**special-K** · 04-05-2007, 07:25 AM

What`s the C/R?

RACINJASON22 · 04-05-2007, 09:42 AM

He still has to check with his shop on head specifics and compression ratio #'s

bryanw1968 · 04-05-2007, 10:27 AM

Found this and it's free. Not as good as DTD but again, free.

http://www.hotroddersauctions.com/te...nlinedyno.html

OLDIRON69 · 04-05-2007, 10:54 AM

I know it is a Mopar site, but the HP calculator there is VERY accurate.

www.mymopar.com

04-05-2007, 12:45 AM	#1
short69 Registered User Join Date: Oct 2006 Location: las vegas Posts: 88	Horsepower estimate??? I just got my engine back from the shop and was wondering if anybody knew how to give it a ballpark estimate as to how much power it's packin based on the the stuff thats on it.I dont know all the specs, but I do know its a .... 400 small block bored 40 over(408) World cast iron heads...Chamber size unknown to me Comp cam 218/226 duration at.050-----462/480 lift aluminum roller rockers Edelbrock rpm air gap intake holley 750cfm Thanks. __________________ 69 shorty w/ 67 front clip

04-05-2007, 12:52 AM	#2
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Horsepower estimate??? World cast iron heads...Chamber size unknown to me. Find this out and we can get alot closer and maybe crunch some better #'s. I would venture a educated guess at respectable 425to450 hp depending on quench and better head info. Like I said just a fair stab at this point. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

04-05-2007, 12:54 AM	#3
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Horsepower estimate??? I had a 383 with the same setup,and it was desk topped at 393hp 430lb ft. I used Sportsman II's. So my guess would be around the same. That cam will be milder in a 400 than a 383. PM Billa, He can do a desk top dyno for you, and he does an awesome job. -Lance __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

04-05-2007, 12:57 AM	#4
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Horsepower estimate??? Billla is good with that deck top dyno from what I have heard. 400 will pull a few more ponies but not alot. Get the head info for him though to be more acurate. The came will feel milder but not perform milder. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR! Last edited by RACINJASON22; 04-05-2007 at 12:59 AM.

04-05-2007, 01:00 AM	#5
short69 Registered User Join Date: Oct 2006 Location: las vegas Posts: 88	Re: Horsepower estimate??? thanks a bunch! Yea I gotta call the shop to see if they measured the combustion chambers... its also got flat top pistons if that matters. __________________ 69 shorty w/ 67 front clip

04-05-2007, 01:02 AM	#6
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Horsepower estimate??? The more info you can provide the more acurate the outcome will be. Deck height, head gasket used ect. ect. the more the better. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

04-05-2007, 07:25 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Horsepower estimate??? What`s the C/R? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 04-05-2007 at 07:25 AM.

04-05-2007, 09:42 AM	#8
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Horsepower estimate??? He still has to check with his shop on head specifics and compression ratio #'s __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

04-05-2007, 10:27 AM	#9
bryanw1968 Senior Member Join Date: Jul 2006 Location: Leander, Texas Posts: 850	Re: Horsepower estimate??? Found this and it's free. Not as good as DTD but again, free. http://www.hotroddersauctions.com/te...nlinedyno.html

04-05-2007, 10:54 AM	#10
OLDIRON69 Registered User Join Date: Mar 2007 Location: Ben Wheeler,Texas Posts: 992	Re: Horsepower estimate??? I know it is a Mopar site, but the HP calculator there is VERY accurate. www.mymopar.com __________________ 05 2500HD 6.0 excab 69 LWB-Gone but not forgotten! 68 Dodge Charger 383/727 69 Dodge Charger-440/4spd



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