799 Cylinder head question
05-31-2013, 08:11 AM
#23
05-31-2013, 08:16 AM
#24
I didn't say it wasn't out there or that 243's don't make more power (minisculy after c&c and bigger valves) . I simply asked if y'all know where I can see actual evidence of this exact situation $ for $. They no dought make considerable more power in stock form such as the Z06.I am not stupid just looking for info. Don't try to be a smart ***.
05-31-2013, 09:17 AM
#25
Can you show us dyno results and or drag strip result in like D/A and temp between a set of C&C ported 241's with over sized valves and milling against a set of like 243's on a stock short block? All I have found is comparisons on larger cubic inch motors and after market heads. I am always on a learning curve, no matter how much I think I know it all. Seriously though, I am not the knower of all LS, but I like to see actual results that pertain to the exact situation.
I have plenty of testing and experience to show that 243 heads produce better results that 241's, as well as many others who've been at this stuff for a while, but to have it all neatly presented and wrapped up in a nice pretty little bow probably ain't gonna happen.
$200-300 more. Most cathedral port heads other than the 243/799's will go for about $100-150 on average. I paid $350 for my 243 heads, and $125 for a set of 862 heads.
05-31-2013, 06:16 PM
#26
Don't buy either if you are going with aftermarket valves, C&C porting,& milling.doing those three things is going to eliminate all the advantages a 243 or 799 have in stock trim. 799 heads do not have the sodium filler valves anyhow. Not even all 243's do. Only if they came off of a Z06. After the C&C and other work 241's are just as good.
05-31-2013, 09:35 PM
#27
TECH Senior Member
06-01-2013, 12:13 PM
#28
Man, I keep having to post this. http://www.hotrod.com/techarticles/e...t/viewall.html
Buy some 243's or 799's and send them to your favorite porter. Sent mine to TEA. Per this article they made same power if not more than a lot of name brand, high dollar heads.
Buy some 243's or 799's and send them to your favorite porter. Sent mine to TEA. Per this article they made same power if not more than a lot of name brand, high dollar heads.
06-01-2013, 05:56 PM
#29
243a have small triangle marks below every spark plug hole. The marks are left by "chills" used during the casting process in GM's semi-permanent mold tooling. Of the three casting facilities that make Gen III cylinder heads, two use SPM tooling, the other heads are sand-cast. The SPM tools produce heads with very smooth, consistent ports and chambers which consistently dyno at least 4 to 7 hp better than the sand-cast heads. #799 heads are sand casted...
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06-01-2013, 06:35 PM
#30
My 799's (06 5.3) are quite smooth in the runners and chambers. Even if your pair isn't, easily remedied with a little sanding roll work.
If you read the article I posted earlier, you will see GM changed the intake port quite a lot. I find it difficult to believe that AI removes the material GM added. But I haven't seen any AI heads in person, so I can't say.
Ron
If you read the article I posted earlier, you will see GM changed the intake port quite a lot. I find it difficult to believe that AI removes the material GM added. But I haven't seen any AI heads in person, so I can't say.
Ron
06-01-2013, 11:04 PM
#31
What are you looking for? 100% of the folks here can vouch for it. 241s are not the hidden secret...You can't even give a set away. I had a brand new set and couldn't even get the dollar a set of used 243s go for. Texas Speed or Vengeance would most likely have a side by side dyno, but most of us use what works and not try to re-invent the wheel. The power #s alone on the factory engines give you a clue on what power they make. Don't get me wrong, a nice set of CNC ported 241s will perform well and make good power, but an equal modded 243 head will make more power for the same $$
