DeTomaso Mailing List: February 98, Message #36
     



From: 	"Cristiano Rossi" <Rossi@image.dk>

Subject: Intake manifold/carburettor

Date: 	Sun, 1 Feb 1998 17:50:39 +0000



I have on my car a standard cast iron intake manifold and a Holley 600 cfm

type 4160. The carburettor has 4 venturies, each with a diameter of about

1.6".



For the first time in the 14 years I have owned the car, I removed the

carburettor from the manifold, mostly of curiosity. I discovered that the

intake manifold has different sized holes. The two front holes are about

1.6" each in diameter, and the rear holes are about 2" each in diameter.



The thick gasket under the carburettor is obviously made for the Holley

carb., and the marks in the gasket show that the rear venturies are a

little offset compared to the big rear holes in the manifold.



My local "US Car Shop" says that they can provide a special spacer that is

almost 1" thick to combine the manifold and the carburettor in a better

way.



If I buy this spacer, there will no more be room for my aircleaner under

the cover.



Questions:



- Do I need this spacer?

- How much extra power will it give me?

- Since my car is a GTS, I have always thought that the Holley carb. was

standard-  mounted from the factory. Is it probable that the factory has

mounted the carb. in the         described way? Were the carb's on american

cars (Mustangs etc.) also mounted this     way?

- Would it be an advantage - instead of installing the spacer - to install

another carb.     with 2" secondaries, which the manifold was obviously

intended fore?



Thanks for any advice.



Cristiano Rossi

thpnma 02869