200ci Boring .4 over

W

wisconsinbronco

New Member

Joined

Feb 26, 2009

Messages

5

• Sep 24, 2009

• #1

What is a stock 200 bored .40 over in terms of cubic inches and about what would this give me in horsepower figures if it was all stock?
Thanks!

 

Broncobowsher

Total hack

Joined

Jun 4, 2002

Messages

34,880

• Sep 24, 2009

• #2

Stock is 3.68 bore x 3.126 stroke = 199.49
Desired 3.72 bore x 3.126 stroke = 203.85

So you are gaining 4 cubic inches or 2% displacment increase.
Power increase will be less then 2% as you are not increasing the breathing capacity of the carb, intake, ports, valves, or any of the exhaust. So you could expect less then a 1% increase in power over a stock engine built exactly the same. You will have bigger differences simply from build variation.

 

B

broncnaz

Bronco Guru

Joined

May 22, 2003

Messages

24,341

• Sep 24, 2009

• #3

I agree very little HP increase maybe 5 if your lucky. Camshaft choice, good flowing heads are where the power is.

 

Explorer

Bronco Guru

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Mar 2, 2008

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4,390

Loc.

Raphine, Virginia

• Sep 25, 2009

• #4

Go to Classicinlines .com and read all the tech articles. If you already have it being bored there are a lot of things from mild to wild you can do to fit your budget.

 

O

Oatmeal

Sr. Member

Joined

May 17, 2009

Messages

664

• Sep 26, 2009

• #5

wisconsinbronco said:

What is a stock 200 bored .40 over in terms of cubic inches and about what would this give me in horsepower figures if it was all stock?
Thanks!

Click to expand...

I think you mean .040"....... .40 is close to a 1/2" -------Hans