SBC intake center bolt holes

[Phil Rickard]

Ryan,

What I have done in the past with something similar,(Vortech cyl. heads used
with other intake manifolds) went like this...
First, I drilled out the unneeded holes in the cylinder head so that no
threads remained, then I machined a brass plug the same size as the drilled
hole + .001" for a nice tight interference fit. Apply green Loctite to the
plug before tapping it in flush with the cylinder head intake manifold
surface for an absolute tight fit and permanant modification to the head.
Than take whatever intake manifold you choose and transpose the new desired
bolt pattern to the cylinder head intake surface, using the same bolt angles
that are in the intake of your choice, then just drill and tap. I used a
Bridgeport mill to clamp the head on so that I could get all of the angles
and holes drilled correctly the first time without "hogging out" the intake
mounting holes.

This makes for a nice, clean, professional looking installation and no one
will ever know the difference, besides it being leak free.
Hope this helps...

Regards...

Phil Rickard- Engine builder/Tuner for Les Stanford-Pirate Racing Corvette
C5R......Formerly with L.P.E.

.
----- Original Message -----
From: <KasaRyan at aol.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, August 30, 2000 12:50 PM
Subject: SBC intake center bolt holes


> Ok folks - lets say you wanted to do some mix and match with heads and
> manifolds on small block chevy's and are too cheap to spend 150 bucks on
the
> right manifold, or 400 on heads.  How do you make them go together - what
> have people actually had luck with.
>
> Option 1 - B&M - now holley - used to sell some aluminum shims and long
bolts
> to make up for the angle difference.  Supposedly you just reversed the
shims
> depending on which way you wanted to go (and probably hogged out the
manifold
> holes) - has anyone used these, know cost or PN?
>
> Option 2 - epoxy the holes in the heads and have a machine shop put in new
> ones at the proper angle - how much?
>
> Option 3 epoxy all the holes and goober everything up with RTV silicone
(big
> chance for leaks)
>
> What works, what have you done, etc. - someone on the howell list was
asking
> the same questions - specifically to put a tbi man on an older engine.  I
> would be more interested in going the other way - tbi heads with old
manifold.
>
> Thanks for listening to my electroyappin!
> Ryan Hampl - a K-State Grad!    kasaryan at aol.com
> 139 Hoover Ct.                  Controls Engineer (tubes rule!)
> Salina, KS  67401               97 B12 / 86 V65 / 93chevy truck EFI 383
> phone  (785) 825 5831           I'M ALWAYS FIRST TO THE GROCERY STORE!
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