[DeTomaso] intake manifold confusion

[Asa Jay Laughton]

Most 351C heads have a 2 or a 4 cast into the upper corners, visible 
outside the valve cover.  This helps you immediately identify heads on 
an engine as either 2V (small port for 2 barrel intakes) or 4V (huge 
ports for 4 barrel intakes.

The 2V and 4V in this case does -not- refer to the number of valves per 
cylinder, but rather as Forest pointed out, the volume based on 
carburetor venturies (originally installed on the engine).

And then, you could have 4V open chamber and 4V quench.  When looking at 
the valve face side of head, this is the combustion chamber area.  A 
large round area indicates what we call an open chamber head.  A 
slightly kidney shape, like this:
http://www.asajay.com/351rebuild/images/engine/chamber.jpg
is a closed or "quench" chamber.  This smaller open area increases the 
compression ratio.  My point being, you might see the number 4 stamped 
in the corner of a head, but you won't really know what the chamber is.

This last part is of no concern in your present situation, it's just 
some gee-whiz info. :)

Asa Jay

forestg at att.net wrote:

> Chris,
> The V in 2V and 4V stands for venturi, not valve. 2V heads are two barrel heads and 4V heads are 4 barrel heads. You need the 4 barrel intake to match your heads.
> Forest
> 
> -------------- Original message from redvobra at aol.com: -------------- 
> 
> 
> 
>>So last weekend I pulled the old Torker intake manifold off of my Pantera and 
>>ordered a new Edelbrock Performer manifold. Went to put it on this weekend and 
>>found that I have the wrong manifold (#2750). The intake holes on this one are 
>>much too small compared to the intake holes in the heads. 
>>
>>When I look at the descriptions at Summit, #2750 is listed for 2V 351C's. It 
>>says that it works on 2-valve heads. Am I missing something here? What does 
>>2-valve refer to, if not the number of valves per cylinder? 
>>
>>I assume now that the intake that I want is Edelbrock #2665, even though it 
>>says it's for 4V heads. 
>>
>>Obviously I still have much to learn. Someone help straighten me out here. 
>>
>>Thanks, 
>>Chris 
>>
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-- 
Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1973 Pantera L 5533
[ASASCAT]

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