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496" bore / stroke ?

Old 09-17-2002, 03:06 PM
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DonMan
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Question 496" bore / stroke ?

Does Mercruiser`s 496 Mag have the same bore stroke as a custom-built 496? (4.25 X 4.25)
 
Old 09-17-2002, 03:19 PM
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4.25 x 4.38

Here are the specs
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Old 09-17-2002, 03:33 PM
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I guess I`ve killed off too many brain cells.
If you have a 454, how do you make it a 496?
What exactly is the new bore / stroke?
 
Old 09-17-2002, 03:46 PM
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Click here for complete 496 engine specs
 
Old 09-17-2002, 03:51 PM
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A factory 496(8.1L) is 4.25" Bore X 4.375" Stroke.

A factory 454(7.4L) is 4.250" Bore X 4.000" Stroke.
If you bore it out by 0.030 and Stroke it 0.250" You'll also get 496.
4.250+ (0.030 X 2) = 4.31 Bore.
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Old 09-17-2002, 03:54 PM
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thanks Daze, beat me to it

Here's a neat calculator for displacement and compression

Last edited by bajadude; 09-17-2002 at 04:01 PM.
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Old 09-17-2002, 04:03 PM
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Originally posted by Baja Daze

Stroke it 0.250"
I`m not even gonna go there....

Thanks for clearing up this bore/stroke thing.
 
Old 09-17-2002, 04:19 PM
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Daze,

Don't you mean bore it .060" over?

My .030" over pistons have always measured .030" total, not .030" per side.



DonMan:

(Bore/2)squared x pi (3.141) x stroke = cylinder displacement

cylinder displacement x no. of cylinders = engine displacement.
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Old 09-17-2002, 07:08 PM
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Originally posted by mcollinstn
Daze,

Don't you mean bore it .060" over?

My .030" over pistons have always measured .030" total, not .030" per side.



DonMan:

(Bore/2)squared x pi (3.141) x stroke = cylinder displacement

cylinder displacement x no. of cylinders = engine displacement.
Yes, that's exactly what I meant...0.030 on the radius, 0.060 on the diameter...Note my formula. Thanks for clearing that up!
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