[DeTomaso] Port Stuffers

[cengles at cox.net]

Dear Paul, 

I have one too. I did an experiment with a stock 4V open chamber head. I had the head tested by my machine shop. The head has no port work only the bowl have been opened up. The stock baseline max flow was about 285 cfm, IIRC. The port with a glued in port stuffer went up a bit more. The port with the stuffer in place plus some clay around the edges to smooth things out {mimicing epoxy} and fill the crevices resulted in an impressive 304 cfm! Wow. 

IIRC, the application says to glue them in place with epoxy. There is a favorite epoxy glue used for these sort of automotive applications. It has more than one name and the one I can think of now is: :"Marine Spar Epoxy". {I'll have to check on all this when I get home from the office and I have access to my files and records.} I have read from another source that port stuffers should be bolted in place from below with a machine screw or bolt as the primary method of fixation. The procedure is to have the holes drilled and tapped in the underside of the intake port opening. Apply the epoxy goop to the port. Place the stuffer on the goop in the port. Apply screw/bolt and proceed to tighten. Once torqued down into position, then wipe out the excess goop and permit the epoxy to set. Finish up when dry with judicious use of a grinder and voila!: over 300 cfm heads (with stock intake port plus an opened bowl). 

JB Weld alone is seductively convenient and easy, but I would doubt that it would be satisfactory in the long run. 

Warmest regards, Chuck Engles 




---- Paul Timko <thedrol at pobox.com> wrote:
> So I have a Parker Funnelweb intake that I'm going to put on my engine
> and it uses port stuffers. How do people install the port stuffers in
> the head? The website says epoxy. Is there a particular type of epoxy
> that is used or do people just use JB Weld?
>
> Paul
> #9270