The great debate
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Teching In
Joined: Oct 2010
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The great debate I've just jumped into this LS world with both feet and am causing a lot of debate in the process. I had an early demise to my first generation small block in my G-body. So I decided to replace it with an LS . Here's the debate that is surrounding my project. What power will this motor make. I've gotten an LY6 engine which is a 6.0 iron block motor with a 9.6 compression ratio. The motor has the L92 heads already but I'll be adding a cam speced out as 243/259 with .624 lift on both sides and 116 LSA. I willl be running a carb with about 12lbs of intercooled procharged air. I also have a methonal injection system. I am thinking of going with a 2" primary tube header into a true dual 3" exhaust. That is the bases for some heated debate between my friends and coworkers at my job. I'm hearing as low as 400s and someone is even thinking high 6s. So I figured the best people to come up with an accurate figure would be people in the LS world. So what do u guys think????
TECH Regular
Joined: Nov 2005
Posts: 459
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From: Arlington, TN
I've just jumped into this LS world with both feet and am causing a lot of debate in the process. I had an early demise to my first generation small block in my G-body. So I decided to replace it with an LS . Here's the debate that is surrounding my project. What power will this motor make. I've gotten an LY6 engine which is a 6.0 iron block motor with a 9.6 compression ratio. The motor has the L92 heads already but I'll be adding a cam speced out as 243/259 with .624 lift on both sides and 116 LSA. I willl be running a carb with about 12lbs of intercooled procharged air. I also have a methonal injection system. I am thinking of going with a 2" primary tube header into a true dual 3" exhaust. That is the bases for some heated debate between my friends and coworkers at my job. I'm hearing as low as 400s and someone is even thinking high 6s. So I figured the best people to come up with an accurate figure would be people in the LS world. So what do u guys think????
Most of the boosted streetable LS motors that are in the 5.3 to 6.2L range go with a intake lobe in the mid to high 220 range.
2. The lift is a little high for the solid intake valves in the LY6 heads + boost, you'll end up killing the springs or worse breaking a valve.
I'ld suggest a small blower cam and have the heads cleaned up and swap out for lighter intake valves (plus good springs).
Just for reference Speed Inc's SC1 and SC2 make good power in the 6.0L range for daily driver cars (if your going for daily driver).
SC1 = lobe 222/228 lift .566/.571 LSA 114
SC2 = lobe 224/232 lift .581/.595 LSA 114
You will need a good fueling system to keep the motor fed (or replace the stock pistons with forged slugs).
Just food for thought.
