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Thread: upgrade to 243 or keep 241?
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12-06-2010 #1
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upgrade to 243 or keep 241?
I have the opportunity to buy ls2 243 heads for $500 for the pair assembled. My question is should I switch or keep the 241's. I have a 70 chevelle with an 04 gto ls1. I am not wanting to set the world a fire with it but just a nice driver with an occasional auto cross or dragstrip run. I was hoping for around 400 rwhp with it with cam and other upgrades, will I be able to get that with the 241 or will I need the 243.
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12-06-2010 #2
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I'd figure on a 15-20rw gain with the 243s. If you had them cnc ported, figure a 35-40rw gain with a good cam. You should be able to hit 400 rw with the 241s and a big cam.
Dave Smith
29 Ford Roadster Pickup blown 327 and stupid
67 Chevelle 396/5 speed PT
65 El Camino L79
12-06-2010 #3
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The 243 LS6 heads are batter than 241s. I am not sure how good of a deal you got there, but its a good upgrade. Don't go too wild on the cam.
Originally Posted by highschool70ss
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12-06-2010 #4
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The $500 is for a brand new pair. Cheapest I could find anywhere else was $640 for the pair. Originally Posted by andrewb70
12-06-2010 #5
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Don't rule out ported 241's. I picked up a set of Lloyd Elliot Stage 2 ported 241's for $300 from a local forum. For the price they're fantastic. They out flow the 243's by a healthy margin.
If you're wanting to go with stock castings, widen your search to the 799's. It's the same port and a similar combustion chamber when compared to the 243.
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