[DeTomaso] 428 tunnel port

[wkooiman at earthlink.net]

Actually, it's a 427 TP.  The valves are supposed to be too large for a 428 bore (4.13).  I don't have any first hand knowledge, so I can only quote what I read.

I've always wanted a 427TP.  They are supposed to be streetable in a light car - like a Cobra.

You can find them on ebay about 4 or 5 times a year, but they're nearly always damaged - usually cracks, but sometimes dings from dropped valves.

Dove makes reproductions, with the normal Dove issues.  They just made a bunch of 427 SOHC parts, including the heads.  They brought in some foundry experts to fix their casting issues - porosity/etc.  It was documented on the FE forum (network54).  If I recall correctly, they were pouring the aluminum too hot, plus they were using the wrong adhesive in the castings, so when they poured the aluminum, part of the adhesive would melt into the castings - which would cause porosity problems.

At any rate, maybe they made the same changes with their other castings, so maybe, just maybe their porosity problems are behind them.  It would be pretty cool to get a set of aluminum 427TP heads of the same quality as Edelbrock heads.


-----Original Message-----
>From: Thomas Borcich <tborcich at msn.com>
>Sent: Jan 13, 2009 12:49 AM
>To: Pantera REALBIG forum <detomaso at realbig.com>
>Subject: [DeTomaso] 428 tunnel port
>
>
>Today I was at a machine shop dropping off my new quenched heads for magnaflux and inspection 
>and was shown a super rare 428 Tunnel Port head. HOLLY CRIMANY those ports were as big as a 
>small fist. Very interesting port shape, round on the top and sides and then somewhat flat on the bottom.
>I thought the 351C ports were big, these looked to be 20% maybe 30% bigger. The machine shop
>owner keeps them in his office and said it would cost him $6K to replace them if they were accidentally 
>swapped for another set of heads.
>
>
>Tom Borcich
>
>
>
>
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