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Ls firing order vs sbc

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Ls firing order vs sbc

Petralia won't reveal the cam specs, except to say it was .640" lift at the valve and ground with a 4/7-firing order swap. He did reveal that he used a trick new spring/retainer set-up from Comp Cams featuring a small-diameter double spring and light, yet very strong Tool Steel retainers to control the large valves up to 6,750rpm.Jan 11, 2011 · I am fairly new to the LS series Small blocks but I have been researching them for over a year. I have built several SBC's and I feel I am fairly knowledgeable. If someone was to build a 406 with AFR 227 heads flowing low 300 , 12.5 to compression, a solid roller 270 at .050, super victor and a...

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I have lots of experience with cam selections in 1st Gen SBC, 4/7 swap, etc, but I want to try something different. Who has experience with using the LSx firing order (18726543) on the Gen 1 (18436572)? And is there a benefit? It would seem that alternating banks vs. 2 sequential cylinders...IMO, the only time an LS sounds good (or better than a Ford 4V) is at idle with a big choppy cam. Any other time (or with the stock cam) the LS sounds like a straight piped farm truck. No tone whatsoever. Compared that to a Coyote with Corsas or a Terminator with Flowmasters it's not even in the same ballpark.