I didn't ask the critical question "is the head ported" but it sounds
like it isn't. You don't need to machine the head further, a die
grinder is an easy way to match the edges. As long as you don't get
in too deep you won't have problems with breaking through to water
passages.
David Vizard has a decent book on head porting that includes a scheme
for TR3/4. Frankly I wouldn't go that far, I've spent a lot of time
on a flow bench with Triumph heads, and sliced one up to get a look
at the cross sections. They're pretty hopeless. The only way I can
see to get them to flow well is really radical changes and that
requires very tricky welding. You don't want to do that.
Other folks seem to have had better luck with porting. Both Uncle
Jack and Greg Solow come immediately to mind but neither of them may
be ready to share any hard-earned secret recipies.
On Jul 5, 2006, at 9:49 PM, malaboge@aol.com wrote:
> Tim-
>
> I seem to recall that the later smaller port head actually ended up
> makin mo' power than the big port model. You would be better off
> changing the intake to the later style to match the head. The early
> intake holes are pretty big for our agricultural revving motors!
>
>
> The holes in my head are waay to big...
> Nick in Nor Cal
>
>
> -----Original Message-----
> From: Tim Murphy <timmurph@fastbytes.com>
> To: 'FOT' <fot@autox.team.net>
> Sent: Tue, 4 Jul 2006 19:45:03 -0500
> Subject: [FOT] 1.5 (Stromberg) head with 1.625 (S.U.) intake manifold
>
> To make a long story short, I didn't check closely enough
> before I had the
> machine shop work done on a cylinder head and now realize I have
> 1.5 inch
> intake ports on the head and 1.625 inch ports on the manifold. The
> head is
> for a vintage race car, 1961 TR-4.
>
> Question: Is there enough stock in the head to allow me to bore
> the head
> intake ports out to 1.625 (1/16 th on a side) for a depth of about
> 1/4 inch
> and then smoothing out the step with a die grinder? I just want to
> get rid of
> that abrupt 1/16 th inch step. Will probably wind up using the
> head on a
> Stromberg street car engine on my son's car in the future.
>
> Next head that we do will definitely be a 1.625 (S.U.) head for the
> race
> car!!
>
> Thanks in advance,
> Tim Murphy
>
>
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