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95 S_Trucker · 03-23-2016, 07:06 AM

The L21(medium duty 454) used cnp and had 8 coils. There is a set of valve covers on the parts board now.

You may need to switch to a 0411 pcm. I'm am exactly sure on this.

Google found lots of info on this.

[URL="http://www.hotrod.com/how-to/engine/ccrp-1111-small-block-chevrolet-ls-conversion/"]http://www.hotrod.com/how-to/engine/ccrp-1111-small-block-chevrolet-ls-conversion/[/

03-23-2016, 07:06 AM	#12
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,179	Re: L29 454 Build for '63 K15 with NV4500 The L21(medium duty 454) used cnp and had 8 coils. There is a set of valve covers on the parts board now. You may need to switch to a 0411 pcm. I'm am exactly sure on this. Google found lots of info on this. [URL="http://www.hotrod.com/how-to/engine/ccrp-1111-small-block-chevrolet-ls-conversion/"]http://www.hotrod.com/how-to/engine/ccrp-1111-small-block-chevrolet-ls-conversion/[/