L-98 to L-31 engine swap - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-16-2011, 08:27 AM
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L-98 to L-31 engine swap

99 S-10 4.3 to L-31 they have the same fuel injection system. thats the main reason I went with the L-31, for stock appearance. I am using a LT-4 hot cam & kit. Port matching the heads & intake. Will the mass air sensor & throttle body flow enough for this combination?

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Old 01-31-2011, 09:58 AM
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If you haven't gotten the information already, the short answer is yes. You might be able to squeeze more out of it with a better intake and carb, but there are people running bigger (not much bigger) cams than that one. Just make sure the heads can actually handle that lift.
Where I'm getting this knowledge is that I was doing a similar swap and had originally wanted to go stock EFI route but was convinced that the intake would not breathe at higher rpms. There's no doubt it's RPM-limited but it seems to be enough for a lot of guys that are running 218 224 duration cams.
Pretty sure you'll need a V8 computer for that, but you probably know that already.

Hope you get all the help you need
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Old 01-31-2011, 05:07 PM
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l-98 to l-31 swap

thanks for the information I have the original pcm that needs reprogrammed for the cam & gears any suggestion would be appreciated.
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