Can anyone give me the rates of Stock SB Chevy HP & Torque??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-07-2005, 01:54 AM
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Can anyone give me the rates of Stock SB Chevy HP & Torque???

Hi!

I will appreciate if someone can give me the 350 Chevy (stock engine which I belive produces 160 horses, but the Torque has not been mentioned anywhere?)

Horse power and Torque.

I was also wondering if anyone can guess how many horses my Pontiac 400 engine is making? Very old enigne with no modifications and Quadrajet stock carb, but has stock air gap intake( it looks like air gaps)

Thank you very much.

Houman
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Old 05-07-2005, 02:09 AM
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Over the years Chevy made dozens of versions of that engine and even a few different ways of rating them. Maybe some good reader has that info at hand but you may have to do your own research on it.
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Old 05-07-2005, 08:21 AM
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What are the engine ID numbers?

for the chevy: www.mortec.com

for the Pontiac: www.spottsperformance.com/engineid
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Old 05-07-2005, 03:51 PM
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Thanks to all.
I found a lot of information about what I wanted in those sites.
I also found some good info. at nastyz28.com

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Old 08-23-2008, 01:41 PM
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Most HP ratings for the STOCK engines with limited carburation (2BBL) & less than free flowing exhaust are usually running @ 70-80% volumetric efficiency.
Thats equates to cubic inch size x .70 to .80 for your peak HP rating.
Example???
350 cubic inch small block chevy w/2 BBl carb, low hp cam & single exhaust =
350 x .70 = 245 BHP
High performance factory versions usually are able to fill in the realm of 90-95% vol efficiency
350 x .95 = 332 BHP

355 x 1.1 = 390HP
355 x 1.4 = 500HP

Many rodders on this forum know what it takes to increase volumetric efficiency well over the 100% mark.

A 350 making over 500 HP takes an artists degree of talent. Small Block Chevy experts such as David Vizard & Smokey Yunick were able to reach these high numbers but with only decades of knowledge, & many thousands of hours of reasearch & good ole fashion wrenchin'.

Good Luck to you & your build!
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Old 08-24-2008, 02:16 AM
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Perhaps too late for luck on this build..post is over three years old..

Check dates..
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Old 08-24-2008, 02:32 AM
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Thanks for helping me learn what year it is.
Did you have anything to add,
relating to how most automotive engineer's fabricate/calculate Brake Horsepower ratings?
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