Difference between a 5.0 and 5.7 in 1989 - Team Camaro Tech
Engine General Engine Discussion.

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post #1 of 4 (permalink) Old Oct 11th, 04, 09:22 AM Thread Starter
Join Date: Oct 2004
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I'm wondering if there a a major difference between the two engines in 1989. I read that that the computer is the same unit so i'm guessing the chip is the only difference in on the brain end. My question is... can I rebuild the engine to be a 5.7 and if so, what would I need to do so?

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post #2 of 4 (permalink) Old Oct 11th, 04, 02:53 PM
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They're externally identical, and share many parts, but the engine block itself is very different, heads too, and pistons, and....

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post #3 of 4 (permalink) Old Oct 12th, 04, 08:33 AM
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the only way to make a 305 into a 350 is to put a 350 in there. but you can stroke 305's out to the 335" range pretty easily- but that makes as much sense as all those Mustang guys that spend all that money stroking their 302's out to 347 instead of just getting a 351W and rebuilding that.

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post #4 of 4 (permalink) Old Oct 12th, 04, 08:45 AM
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If you are talking about using your EFI system on a 350, chances are it will work. But it won't be plug and play. Most likely, the fuel injectors would have to be increased slightly.

If your system is a Mass Air Flow system it will require less fussing. Since both motors run at the same fuel / air ratio, the MAF sensor will command more fuel from the ECM to match the increased flow. But, every engine has it's quirks. The fuel and ignition curves are not straight lines so some tuning would still be required.

If you're talking about a speed density system, which uses a Manifold Absolute Pressure sensor, the problem is magnafied 10 fold. SD systems base their fuel management algorithms on the volumetric efficiency of the engine at various RPMs. The two motors' VE curves would be significantly different.

If this is the topic you are interested in, check out www.thirdgen.org The 3rd generation computers are probably the easiest to hack and have the most information available.

68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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