Ramjet 350 cam in l311/29/2024 ![]() The L21 uses the 512kb 0411 like PCMs, which are the same as the same year LS1 driven Y-body Corvettes. ![]() The 1998-2001 Vortec 454 rpo L21 GEN 6 BBC uses the high resolution 24x reluctor wheel to provide the CKP sensor signal, and it uses the same lower portion of the L29 distributer but instead of the flat crab 9 pole distributer cap, it simply has a plastic cap as the distributer isn't used for high tension electrical distribution, the L21 distributor is ONLY used for oil pump drive and the 1x CMP signal. 30-34 pin connectors and a 257kb calibration file. You are correct about the 1996-2000 rpo L29 Vortec GEN-6 454 using the low resolution 4x reluctor and crab(flat cap) distributer with 9 high tension connection(1 coil to distributer and 8 distributer to spark plug) use the "blackbox" PCM with 4 approx. ![]() Ramjet 502's (502hp/567lb/ft torque)and Ramjet ZL1 454 510hp/493lb/ft don't use CranKshaft position sensors(CKP sensors) ![]()
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