I was talking to a fellow thirdgenner the other day and he was mentioning to me that he had heard that I could probably have a custom cam ground with LS1 valve timing ground into it but still have the Gen I block cam journals and nose on it. This would obviously change the whole firing order around, so all I'll have to do is swap around my plus wires to the new firing order, but i'm not exactly sure how plausible this is. I sounds like it could work to me, but wanted to get some second opinions. I was thinking about the positioning of the pistons/rods on the crank and if they are the same in the LS1 firing order? Hmmmmm.....I'm sure they all have to be the same degrees apart but are they postioned differently on the crank? Any ideas?


Tom

 

Alternate firing order and reverse rotation cams have been available long before the LS1 was even a concept. There have been several studies, dyno tests, and testimonials regarding the effectiveness of altering the firing order in the old SBC. The dyno results I've seen show essentially no gain from this practice. No loss, either.

 

Forget that crap, you can get a custom cam to do anything you want.

 

yeah that won't help you any. interesting concept, but doesn't really change the output of the engine. and it'll make it sound like sh*t.

 

The Comp Cams XFI series are close to what you are talking about. XFI stands for Xtreme Fuel Injection.

 

Ok, well since everyone here seems to be a valve timing expert, why did GM change the firing order for the first time in 40 something years with the LS1. There must have been some reason, cause I don't think they got that bored over there. Anyway, I forgot to mention, I was mainly interested in it to possibly smooth the motor out a bit without losing HP

Tom

 

It reduces crank bending and also enhances the intake charge momentum.

Also the LS1 ports are setup like a BBC, not like the SBC.

 

I don't recall offhand the exact reasons why they did it, but it wasn't primarily to increase power, because it doesn't.

And it still sounds like sh*t.

 

i assume the same reason they totally redesigned the engine..