243 heads worth it?
give tsp a call if you have springs already get your 241s cncd for 600 or so and call it a day. I will pay 600 for a better flowing 241 than say 500 for stock 243s... btw a ls1 head say 241 has the same capability as the 5.3 head as far as flow. only thing thats better on the 5.3 heads for n/a is the small combustion chamber for compression increase even more than an ls6 head.
prc heads from tsp site
5.3 head stage 2.5 ls6 stage 2.5
.2=147/111 .2=147/114
.3=206/145 .3=209/152
.4=254/185 .4=258/191
.5=291/204 .5=294/207
.6=312/223 .6=316/226
prc heads from tsp site
5.3 head stage 2.5 ls6 stage 2.5
.2=147/111 .2=147/114
.3=206/145 .3=209/152
.4=254/185 .4=258/191
.5=291/204 .5=294/207
.6=312/223 .6=316/226
ported 241's from tsp for 600 will get you close to 290cfm and thats half the price of the 5.3's. The op said he was on a BUDGET, thats why these option are available, for those on a BUDGET lol. Obviously there are better options if money allows. The whole point is ported 241's will out flow a cast 243 all day,and it don't cost much more than what you would pay to pick up a decent set of stock 243's. It all depends on goals for the car and again BUDGET...
Teching In
Joined: Jan 2010
Posts: 26
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From: Lakewood, Co
Last edited by Camaronut396; Feb 12, 2010 at 03:57 PM.
I would definately get a pair of 243/799s. I just bought 799s that came off a a GXP for $350. Slap them on your car now and then save up and get them ported/polished later. There are plenty of guys on the forum making good power with 243/799s.
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My Ls1 is out of my car right now getting reringed and i was wondering if the 243's are worth doing since i have everything apart? how much of a gain will i see from a stock set? my mods are torquer v2, lts, ported tb and a couple more odds and ends... i have found a couple sets for 500.00 and just wondering if its worth the money?
just getting a better VJ by someone that knows LS motors will gain you a few more CFM,but then your adding cost to the budget..
look at your options,decide what your willing to spend as for dollar per HP, and if the extra cost is worth the expense..
Thread Starter
Launching!
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Joined: Feb 2009
Posts: 225
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From: Morrison, Colorado
I was hoping for around 400rwhp n/a i am not sure if i can get there or not... what do you guys think? is it do able with bolt ons a torquer 2 and a set of stock unported 243's... i am guessing no lol. My bro keeps trying to talk me into a magic stick, what that be a better way to go? sorry a little off topic lol
do a search and you will find lots of examples
https://ls1tech.com/forums/dynamomet...k-results.html
https://ls1tech.com/forums/dynamomet...k-results.html
What year GXP did you get the heads off.
I wanna say it was an '05 or '07 Grand Prix GXP with a 5.3L LS4 in it. I'm not positive on the year though. I'm pretty sure all LS4 GXPs, Monte Carlos SS, and Impala SS come with 243/799s. Check out the LS4 section, ya might find some used 243/799s for sale.
Thread Starter
Launching!
iTrader: (2)
Joined: Feb 2009
Posts: 225
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From: Morrison, Colorado
So i just pick up a set of 799's for 375 shipped... and my tax return was a little more than i thought it would be, so i have a little bit of money to throw in to these. They have around 20,000 miles on them, any ideas on any work i should have done to them??? i have about 400 maybe a little more to throw at them.
So i just pick up a set of 799's for 375 shipped... and my tax return was a little more than i thought it would be, so i have a little bit of money to throw in to these. They have around 20,000 miles on them, any ideas on any work i should have done to them??? i have about 400 maybe a little more to throw at them.
