How much horsepower for a 402 Chevrolet BB

njk53 · 03-12-2014, 09:51 AM

Just curious we run a 1971 402 big block Chevrolet in our stocker and was wondering if I can get an opinion from knowlegeable engine guys. How much horsepower do you think is a reasonable number for our engine?
The achilles heel of our engine is the flat intake manifold that looks like the fuel has to run uphill at one point. We have the 820 casting cylinder head. Thanks

Bobby Lundholm · 03-12-2014, 10:12 AM

Give Chris Hardy a call. He's very knowledgeable and can help you with your setup.
Plus he's in Michigan as well. 231-740-5862

Jim Hanig · 03-12-2014, 11:58 AM

Quote:

Originally Posted by njk53

Just curious we run a 1971 402 big block Chevrolet in our stocker and was wondering if I can get an opinion from knowlegeable engine guys. How much horsepower do you think is a reasonable number for our engine?
The achilles heel of our engine is the flat intake manifold that looks like the fuel has to run uphill at one point. We have the 820 casting cylinder head. Thanks

Needs to make around 150 over its rating

HP HUNTER · 03-12-2014, 09:30 PM

Quote:

Originally Posted by njk53

Just curious we run a 1971 402 big block Chevrolet in our stocker and was wondering if I can get an opinion from knowlegeable engine guys. How much horsepower do you think is a reasonable number for our engine?
The achilles heel of our engine is the flat intake manifold that looks like the fuel has to run uphill at one point. We have the 820 casting cylinder head. Thanks

Just guessing I would say 480. The 70 402 350 HP low rise intake makes right around 500 HP @ 6300 RPM.

countrypuppy4865 · 03-12-2014, 10:43 PM

470 hp would be around -.70

gtaa · 03-13-2014, 03:14 AM

Get in contact with Darrel Wikle he makes all BB chebbis sing.
316-942-9500

M.Lind
D/SA 801

03-12-2014, 09:51 AM	#1
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	How much horsepower for a 402 Chevrolet BB Just curious we run a 1971 402 big block Chevrolet in our stocker and was wondering if I can get an opinion from knowlegeable engine guys. How much horsepower do you think is a reasonable number for our engine? The achilles heel of our engine is the flat intake manifold that looks like the fuel has to run uphill at one point. We have the 820 casting cylinder head. Thanks __________________ Nelson Kowal Stock 345

03-12-2014, 10:12 AM	#2
Bobby Lundholm Member Join Date: Dec 2006 Location: Charlevoix, MI Posts: 451 Likes: 110 Liked 121 Times in 48 Posts	Re: How much horsepower for a 402 Chevrolet BB Give Chris Hardy a call. He's very knowledgeable and can help you with your setup. Plus he's in Michigan as well. 231-740-5862 __________________ Bobby Lundholm 3516 G/SA

03-12-2014, 10:43 PM	#5
countrypuppy4865 Senior Member Join Date: Nov 2003 Location: Donaldsonville, LA Posts: 980 Likes: 17 Liked 228 Times in 70 Posts	Re: How much horsepower for a 402 Chevrolet BB 470 hp would be around -.70 __________________ Jimmy "Cooter" Hidalgo, Jr. 4865 E/SA '04 GTO 4865 SS/GA '99 Firebird

03-13-2014, 03:14 AM	#6
gtaa Junior Member Join Date: Jan 2005 Location: Sweden Posts: 96 Likes: 36 Liked 4 Times in 2 Posts	Re: How much horsepower for a 402 Chevrolet BB Get in contact with Darrel Wikle he makes all BB chebbis sing. 316-942-9500 M.Lind D/SA 801

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