DeTomaso Mailing List: February 98, Message #144
     



From: 	Dan Jones <djones2@mdc.com>

Subject: Re: 2V-4V Intake for Aussies - Reply

Date: 	Tue, 3 Feb 1998 14:06:00 +0000



Kirby,



> Our Longchamp has an Australian engine (or at least everyone who seems

to

> know says it is). How, in fact, do you tell for sure just looking at

it

> from the outside?



Your car's a '78 right?  No U.S. 351C's since '74.  Later Clevelands were

sourced from Australia.  If your engine is the original it's from down

under.



> The heads are definitely 2V, since they look like the 2v heads in the

POCA

> issue about heads and I had to get 2V exhaust gaskets in order for them

to

> fit when I was fixing the exhaust leak that the car had initially.



The real question is whether or not they are closed chamber or open chamber.



> Are the valve covers the same bolt pattern as a Cleveland?



Yes.



> The intake is a Holley. Don't know more than that... I'll have to look

> tonight and see if I can find a number. And it's got an Edelbrock carb

on

> it. First one I've ever seen! My experience has always been the other

way

> around.... Holley carb on an Edlebrock manifold!

> :-))



That would be the Holley Street Dominator.  It's a low rise single plane

that's meant to be compatible with either 2V or 4V heads (ports are 2V

size).  One interesting thing is that the carb pad opening is not square.

 The aft part is wider than the front part, as if it's meant to clear spreadbore

secondaries.  When I get

a chance, I'll see if a Quadrajet or a Thermoquad will bolt up.



> I also have the original intake which is a heavy cast iron 4bbl model.



Is it spreadbore or squarebore?  I'm told a lot of the Aussie 351C's were

fitted with Quadrajet carbs.



> The car doesn't perform as well as I expected.... but then, it's a lot

> heavier car. Maybe the carb is a small one... I need to find a number

on it

> also and see what cfm it's supposed to be.



As far as Edelbrock carb are concerned:



 1404 is 500 cfm

 1405, 1406, and 1408 are 600 cfm

 1407 and 1410 are 750 cfm



The Holley single plane intake isn't really suited for a heavy car.  I'd

swap it out for an Edelbrock Performer or an Offy Dual Port (available

in square or spreadbore)

intake.  The spreadbore Dual Port would be my choice for throttle response

and fuel economy.  Also, it's likely you have open chamber heads.  If so,

I'd pick up a set of closed chamber Aussie 2V's (available from Mike Fielder

for $300, sometimes less at swap meets) to get the compression ratio up.

 Also, I'm not sure what sort of cam the Aussie open chamber 2V's came

with, but the U.S. 2V cams were pretty lame.  



Later,

Dan Jones