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-   -   Point/Counterpoint: DOHC v OHV (http://zr1.net/forum/showthread.php?t=25450)

edram454 08-15-2015 05:19 PM
Re: Point/Counterpoint: DOHC v OHV
 
Quote:
Originally Posted by pantera1683 (Post 230778)
Big Block?
Im surprised nobody caught it sooner. BB?

ed ramos #3028

Kevin 08-15-2015 06:27 PM
Re: Point/Counterpoint: DOHC v OHV
 
Quote:
Originally Posted by edram454 (Post 230781)
Im surprised nobody caught it sooner. BB?

ed ramos #3028
thought that was standard short hand.

XfireZ51 08-15-2015 08:04 PM
Re: Point/Counterpoint: DOHC v OHV
 
Quote:
Originally Posted by Kevin (Post 230784)
thought that was standard short hand.
Although it's a 427, that doesn't make it a big block. It's still an LSx block just a bigger bore. I may be oversimplifying it.

Kevin 08-15-2015 08:20 PM
Re: Point/Counterpoint: DOHC v OHV
 
Quote:
Originally Posted by XfireZ51 (Post 230788)
Although it's a 427, that doesn't make it a big block. It's still an LSx block just a bigger bore. I may be oversimplifying it.
fair point, well made and nicely presented. I'd forgotten that the ls7 was a sbc

Fully Vetted 08-16-2015 06:02 PM
Re: Point/Counterpoint: DOHC v OHV
 
Quote:
Originally Posted by Kevin (Post 230789)
fair point, well made and nicely presented. I'd forgotten that the ls7 was a sbc
My mistake. I thought it was a BB.

mike100 08-16-2015 07:51 PM
Re: Point/Counterpoint: DOHC v OHV
 
The LSx all have the same block dimension, but I took at as any v8 over 400 cubic inches to be a "big block" as the historical packaging generally had its threshold at about that size.

Fully Vetted 08-16-2015 08:08 PM
Re: Point/Counterpoint: DOHC v OHV
 
I had a 70 1/2 TA that had a 400 small block (Ram Air III). If I'm not mistaken the "small block/big block" designation was only applied to Chevy engines, tho. But the Pontiac 400 was always referred to as a small block.

XfireZ51 08-16-2015 08:14 PM
Re: Point/Counterpoint: DOHC v OHV
 
Quote:
Originally Posted by mike100 (Post 230830)
The LSx all have the same block dimension, but I took at as any v8 over 400 cubic inches to be a "big block" as the historical packaging generally had its threshold at about that size.
396 was a big block back in the day, so displacement was not the determination for the designation. BB cylinder heads would not work on a small block and vice versa.

Kevin 08-16-2015 08:54 PM
Re: Point/Counterpoint: DOHC v OHV
 
I thought it had to do with the bore spacing?

XfireZ51 08-16-2015 09:27 PM
Re: Point/Counterpoint: DOHC v OHV
 
Quote:
Originally Posted by Kevin (Post 230838)
I thought it had to do with the bore spacing?
Well you could say bore spacing has something to do with it. Here's a very illustrative video of the difference. The name "big block" becomes pretty obvious.

http://youtu.be/LPZuEWli4gQ


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