TBI manifold on OLD heads

Don.F.Broadus at ucm.com Don.F.Broadus at ucm.com
Wed Oct 14 13:16:42 GMT 1998


You might want to try header bolts on the intake. They work well and have a
7/16 head. Get the 1" long ones if they will fit. 
 















----Original Message-----
	From:	Shannen Durphey [SMTP:shannen at mcn.net]
	Sent:	Tuesday, October 13, 1998 8:51 PM
	To:	diy_efi at efi332.eng.ohio-state.edu
	Subject:	Re: TBI manifold on OLD heads

	Kevin Vannorsdel wrote:
	> 
	>  Shannen,
	> 
	> Did you use an Edelbrock manifold or a stock one...   There is no
way I can get
	> a standard hex bolt into those center holes...  I have been using
these short
	> 12 point bolts which still barely get into the hole without
banging on the
	> vertical part of the manifold.   This is a BIG hassle ---   I
gotta start them
	> with a needle-nose pliars and eventually can get a box end wrench
on it...
	> 
	> Did you have these problems?
	> 
	No, I used a stock manifold.  But I might have used a carbide burr
to
	open up the area around the base.  I don't remember doing that, but
if
	the manifold had enough material and I needed the room, I definitely
	would have.  Would Allen head cap screws work better?  You could use
	blue loctite on them for a worry-free installation.

	Shannen

	> ________________________________________________
	>   Kevin Vannorsdel     IBM Arm Electronics Development
	>     408-256-6492                Tie 276-6492     kv at us.ibm.com
	> 
	> owner-diy_efi at efi332.eng.ohio-state.edu on 10/13/98 12:07:38 PM
	> Please respond to diy_efi at efi332.eng.ohio-state.edu
	> To: diy_efi at efi332.eng.ohio-state.edu
	> cc:
	> Subject: Re: TBI manifold on OLD heads
	> 
	> I've done it, and it worked.  But it was not very aesthetically
	> pleasing, and I had to spend a bunch of time on it.  It leaves you
with
	> large slots in the center, which I was able to cover with some
special
	> washers I made.  I used shouldered bolts from the original
manifold/head
	> combo.  Can't tell you if they came loose, the vehicle has never
been
	> back to the shop.  But I have no reason to suspect they would
have.  No
	> torque wrench, just like many older carb. manifolds.  this is
where the
	> "calibrated elbow" is practical.
	> 
	> Shannen
	> 
	> Kevin Vannorsdel wrote:
	> >
	> >  I guess this is EFI related...
	> >
	> > Has anyone out there been through the exercise of modifying a
TBI manifold (SB
	> > Chevy) to fit onto a 350 with the "old" heads.  This involves
slotting and
	> > re-angling the center holes.
	> >
	> > I did it a year or so ago -  and have a few questions/problems-
	> >
	> > 1)  What bolts did you use to mount the thing?
	> >
	> > 2)  Have they ever come loose over time?
	> >
	> > 3)  Were you able to use a torque wrench on the center holes
	> >
	> > Any thoughts are welcome!
	> >
	> > ________________________________________________
	> >   Kevin Vannorsdel     IBM Arm Electronics Development
	> >     408-256-6492                Tie 276-6492     kv at us.ibm.com



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