Chip for 85 305 TPI on carb 350

[Knowlden and/or Eller]

'89 Vette with alum. heads  9.5 to 1 compression ratio.


Aluminum	Casting #10088113	P/N 14101127 (bare)
Similar to	P/N 1255463, 10185086
Comb Chmbr	58cc
Intake run vol	163cc
Valves	1.94, 1.50


Bob

-----Original Message-----
From:	owner-gmecm at esl.eng.ohio-state.edu
[mailto:owner-gmecm at esl.eng.ohio-state.edu] On Behalf Of CSH-HQ
Sent:	Friday, July 30, 1999 7:31 PM
To:	gmecm at efi332.eng.ohio-state.edu
Subject:	Re: Chip for 85 305 TPI on carb 350


>Supposedly, the old 305 and new 350 both had heads with the same size
>chambers.  I don't know which heads ended up in the car.

But, different sized valves.

  If Chilton's
>is to be believed, this engine now has a CR of 8.2:1, compared to 9.0
>for a 350 TPI and 9.5 for a 305 TPI.  Could someone who has a head for
>Chevy heads confirm this?
>
>Presumably, this 350 block has a wimpier cam than a TPI would normally
>have.

Really not that big of deal. Without doing a bunch of work just throw some
1.6 stamped rockers on it.
>
>Are 305 and 350 TPI injectors the same, or does the 350 use a higher
>flow rate?

350 bigger
>
>What should be changed to deal with the lower CR?  Advance the timing?

Octane is the controlloing issue, and making timed passes. Advanced will
feel quicker, but it might be slower.
Bruce
>
>I'm sure that some of this is answered in the list archive, which is my
>next stop.
>
>--
>Ludis Langens                               ludis (at) cruzers (dot) com
>Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
>