[DeTomaso] Mismatched Intake and Head Ports
Richard Greenblum
richard at richardgreenblum.com
Sat Feb 13 12:07:23 EST 2016
Mike,
I helped William King with that motor including setting up the Webers. I met with you and William for a drink when you came to Austin. If I recall correctly, there was no work done to port match. The formerly Holley/Blue Thunder (I believe) equipped motor went back together with the Weber setup without the need to do that. And I don't remember William having to have a lot of resurfacing done to the heads which came on that motor.
Richard
Austin, TX
Sent from my iPhone
> On Feb 13, 2016, at 01:20, Mike Becker <mikebecker679 at gmail.com> wrote:
>
> Yes, that could be an explanation. When I bought the car (15 or so
> years ago), it was fitted with a Webers setup. They may have
> port-matched the heads to the Weber intake.
>
> mike
>
>
>
> From: Ken Green [mailto:kenn_green at yahoo.com]
> Sent: Friday, February 12, 2016 11:08 PM
> To: Mike Becker <mikebecker679 at gmail.com>; 'Mike Drew'
> <MikeLDrew at aol.com>
> Cc: detomaso at poca.com; David Briggs <d.briggs at cox.net>
> Subject: Re: [DeTomaso] Mismatched Intake and Head Ports
>
>
> Maybe the heads were ported?
>
>
> Ken
> _______________________________________________________________________
>
> From: Mike Becker <[1]mikebecker679 at gmail.com>
> To: 'Mike Drew' <[2]MikeLDrew at aol.com>
> Cc: [3]detomaso at poca.com; David Briggs <[4]d.briggs at cox.net>
> Sent: Friday, February 12, 2016 9:27 PM
> Subject: Re: [DeTomaso] Mismatched Intake and Head Ports
>
> ok, maybe I am nuts. But the ports are way bigger in the heads.
> Almost
> half an inch taller and quarter inch wider.
> I've attached 2 pictures. When you look at the picture with the gasket
> sitting on the intake manifold, it looks good, the size matches.
> Excuse my
> artwork, but on the picture of the gasket on the head, I've highlighted
> with
> yellow the approximate area behind the gasket where there is nothing,
> just
> the open port. So fair enough, along the sides, it's only about one
> eighth
> of an inch on each side, no big deal. But along the top and bottom,
> that
> means there will be very little gasket material sandwiched between the
> head
> and the intake. My fear is that the thin strip of gasket material will
> blow
> out again, just like the last set of gaskets.
> mike
>
> -----Original Message-----
> From: Mike Drew [mailto:[5]MikeLDrew at aol.com]
> Sent: Friday, February 12, 2016 8:42 PM
> To: Mike Becker <[6]mikebecker679 at gmail.com>
> Cc: <[7]detomaso at poca.com> <[8]detomaso at poca.com>
> Subject: Re: [DeTomaso] Mismatched Intake and Head Ports
> Mike,
> You're a spaz. :)
> Boss 351 heads and standard 4V 351C heads are identical, except that
> the
> Boss heads come from the factory with machining in the rocker arm mount
> area
> so they can accommodate adjustable rockers, because the Boss came with
> solid
> lifters. The rest of the head, including the intake ports were
> absolutely
> identical.
> Now, it's possible that at some point somebody decked your block, which
> lowers the heads and alters the relationship between the intake and the
> heads. Normally the intake is machined accordingly if a bunch of
> material is
> taken from the block. The heads are not only lower, but also closer
> together
> since they move closer to the centerline of the engine as they are
> moving
> down. So the bottom of the intake may need to be machined to allow it
> to fit
> properly.
> Could that explain the mating problem you are seeing?
> Mike
> Sent from my iPhone
> On Feb 12, 2016, at 20:24, "Mike Becker" <[9]mikebecker679 at gmail.com>
> wrote:
>> Hey Gang,
>>
>> I've just torn down my top end on my Pantera because the intake
>> manifold gaskets were completely destroyed. They were the so called
>> self-destructing Felpro Print-O-Seal / Print-O-Leak gaskets. Only,
> I
>> see now what the real problem was. I went to fit my brand new
>> Edelbrock gaskets and there's no way they'll work! It turns out I
> have
>> BOSS 351 heads and a Cleveland intake! This undoubtedly contributed
> to
>> the early demise of the old intake gaskets. because in the
> mismatch,
>> there are several places where there is minimal surface contact in
>> order to sandwich the gasket. The result is that the gasket isn't
> held
>> in place for long. While the engine was still assembled, there were
>> places where the entire blue stripe on the gasket material was
>> completely exposed, i.e. not sandwiched between the intake and the
>> head. See attached photos for the results.
>>
>> So, now what do I do?
>>
>> - Switch to aluminum heads for a couple of grand (can't really
> afford
>> it)
>>
>> - get a BOSS intake (can't seem to find one, they all look like
>> windsor intakes, except for one NOS unit for 3 grand!)
>>
>> - fabricate home-made gaskets
>>
>> I saw some nice original BOSS 351 iron heads on ebay for $2500. Are
>> they really worth that much? If so, mine are still very fresh,
> maybe I
>> could sell them to fund a set of Trickflow aluminum heads.
>>
>> Somebody please help me before I blow a gasket!
>>
>> thanks,
>>
>> Mike Becker (San Diego)
>>
>> 1741
>>
>> <<...>> <<...>>
>> <passengerside.jpg>
>> <driverside.jpg>
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