BlackedOut LS1

iTrader: (4)

Hey fellaz, theres a guy selling a single 799 head on Ebay for $115. I'm planning on having AI CNC a set of 243's or 799's instead of my 241's I have currently. Is there any trouble I might run into buying one cylinder head instead of a set? He does have a set for $400 which isn't bad, but I'm trying to find ways of shaving cost off of a $7k engine build.

PREDATOR-Z

Buy as a set.

codyvette

iTrader: (24)

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.

BlackedOut LS1

iTrader: (4)

Ive been trying to figure out whether to have AI do their 219cc full port, or have them do a set of 243's or 799's. Alot of guys told me to go with the 243's.

JustAFooL

iTrader: (45)

A.I. does great work, their 243's numbers and times speak for themselves. If you already got 7k in this build, don't skimp now! Good heads will make the difference on any motor..

Macs98Z

iTrader: (16)

I wouldn't be so sure of that. IIRC, Phil usually quotes the 243/799 heads with port work about 10-20 rwhp more than the 241s, which is about the same difference between the two untouched. The ports are still different, even CNC'd. There's only so much a machine can do. This is assuming they are both used on a stock 346 shortblock. It sounds like the OP is possibly building a stroker engine, and I would imagine the performance gap between the two heads would increase with displacement.

badazz81z28

iTrader: (6)

Since you are starting fresh...I would opt for TFs or AFRs. I wish I did...

KCS

iTrader: (20)

Um, that's a negative. The 243/799 ports are shaped differently and a CNC machine isn't going to be able to do anything about that. The 243/799 head has a taller short turn for the air to be able to better maneuver around, and is wider over that short turn to keep the airspeed down as well.

ejbta2

i have a set of 862"s with a fresh valve job 2.05/1.6 ferrea ss valves new lunati dual springs and 60cc combustion chambers cnc ported will sell for $1000 ready to go. 918-520-0229 call if interested

BlackedOut LS1

iTrader: (4)

Nah, Im not going to build a stroker, bc I really don't know what to expect if I did something like a 383. I'm really just shooting for the ultimate daily driver except that I am probably only going to drive it on the weekends, and possibly on small roads trips to Houston, TX or Destin, FL. Maybe if someone could explain the advantages of a stroker I might strongly consider it. I'm looking to make around 420-450 RWHP with good power under the entire curve, and excellent driveablilty. Im going to have a good mid-range cam spec'd with what ever head I go with, and I have a ported FAST 90/90, with 42lb injectors. 3600 stall, and possibly an RPM level 4 Trans. Futrals in Walker, LA will be doing the work and tuning.

Kingc8r

iTrader: (21)

Im surprised more people don't run AI's ported Dart heads. Phil has said they'll putto down 10-15 more hp than his ported 243s. They're under $1600 and you only have to pay shipping one way as opposed buying 799/243's [ possibly paying shipping on them ] then shipping them to AI, getting the porting done then paying shipping them back to you.

BlackedOut LS1

iTrader: (4)

I emailed Phil about a day ago, I will go ahead and ask him about that option also when he responds. Thanks for that option though.

Kingc8r

iTrader: (21)

You're welcome. I'm waiting for Rise of the Phoenix's results. He just picked them up.

RonSSNova

iTrader: (3)

Glad you said this. I was going to ask if the AI CNC machine could add metal to the 241.........

http://www.c5registry.com/documents/ls6/page4.htm

This is a good read on the development of the LS6 Z06 head

Ron

badazz81z28

iTrader: (6)

Easier, cheaper, and more reliable to just get 243/799s...there are plenty out there.

codyvette

iTrader: (24)

0.K., you got me. That should have been put like this......At 450+ h.p. who cares about 10 to 15 h.p. for that much extra $. If you are going to spend extra money go all after market unless you are getting the 243's super dirt cheap. Just my .02

KCS

iTrader: (20)

The 243/799 heads are $200-300 extra. 10-15hp for $200-300 is a good deal at that power level. You'll make less power per dollar going with aftermarket heads that are $2-3k, and you most likely won't even hit 500whp.

$300/10HP = $30/HP

$2000/50HP = $40/HP

codyvette

iTrader: (24)

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.

badazz81z28

iTrader: (6)

Plenty of dyno results out there. 243s make more power...why else do you think they were on the Z06 and the LS2 and not the 241s?

codyvette

iTrader: (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 ***.