[Gmecm] SBC TBI intake to 86 and earlier ???

[jryan at caminofx.org]

Redrilling the holes works, but it's ugly.  Without making special  
washers, you can't get much clamping force on the four center bolts  
(next to the carburetor/TBI mounting pad).  I drilled a TBI manifold  
to fit an '84 305, but I wouldn't do it again.  When I got a 350, I  
got an '87-later-style block and a new TBI manifold and bolted it on.

The bolt angle was changed to make it easier to put a wrench on those  
bolt heads.  It makes a huge difference.

TBI high-swirl heads are meant for high fuel economy and low-end  
torque.  I have them, and I am getting 20 mpg from a 350 in a 3500-lb.  
car that is not very streamlined.  Mine is a daily driver, though, so  
low-end torque and fuel economy are more important to me than top-end  
performance.

For what it's worth, I get the same gas mileage from a 350 with TBI  
high-swirl heads and 9.2:1 static compression as I did from a worn out  
305 with 8.6:1 compression.  Same car, same transmission and rear  
axle, same ECM, only the engine and PROM changed.

Quoting Mike <sonoma at shaw.ca>:

> Hi
>
>
>
> When I installed a throttle body on my friends old Chevy 350 we used  
>  an adapter.
>
> I didn't like the look of the adapter so I was going to use the TBI   
> intake and modify the center bolt holes for my pre-87 engine.
>
>
>
> After reading some of the messages here it sounds like there has   
> been some problems using the TBI intake on the earlier engines.
>
>
>
> What is your experience using this intake on an older small block chevy??
>
> Also I was curious which heads are better 80-86 or 87-91 truck heads  
>  or are they about the same??
>
>
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