Thanks man.

 

What heads came on the 2000 F-Bodies?

 

In ported form AND stock form the 243's are superior. They have a better shape and more meat in the right areas. No doubt you can improve the 241's with porting, and a well ported set of 241's will do better than a pair of poorly ported 243's. There are areas in 241's where a good porter would need to remove material to get the perfect shape he wanted, but he can't because he'd hit water.

 

im not goin to try and steal any ones glory here but i have to agree with hammertime with the numbers and the streetablity vs. raceability. even tho your 241 heads may flow 320 cfm on the intake, the only time any engine is going to use that full 320 cfm is if it is forced in there. but then yoour exhuast is 100 cfm less then the intake which means if youo do use all your 320 cfm then your going to be backed up on the exhaust side but thats besides the point. for a moderately sized cam you do want a good flowing intake and a good flowing head but not to the point where the head is only good at max rpms. you want a head that can flow decently at driving speeds and rpms, cuz honestly where are you going to use over 250 cfm wide open daily unless the car is a dedicated race car. thats why the l92 heads are a great flowing head but those heads are almost never going to meet their full potential. but not only do you want flow rating at low rpms, but it also comes down to volume vs. effeciency like hammertime said. if you have to much volume and too little effeciency then the flow will slow down to the point where the heads are a race only application even with an aggressive street cam. so want a head that can both provide enough air for the cam you have chosen but also provide enough flow that it can be driven at streetable speeds and rpms. so yes 241's and 853's stock are very restrictive for even the mild cam swap. but a good set of ported 241's or 853's are better then stock 243's and will be enough for the mild to moderate cam swap (220 to high 230 duration cams), but anything over that will deffinately want a set of ported 243's or a set of cnc'd heads. but once again it also depends on the flow ratings not only at maximum valve lift but at all through the lift cycle.

 

airflow consumed by engine has many variables.
243 or 799 are better option over any other cathedral port head in stock form. and will support over 500bhp in 5.7L+ engines.

 

Plus the much more efficient CC. The 241 has shrouded valves, especially when someone throws larger valves in there w/out cleaning that side of the CC up. Thanks again for the great deal on 799s!

Oh yea, we're in a 9 month old thread

 

no kiddin still good advise

 

My 2000 has 853 cast.. I can pick up a set of assembled 241's from a guy down the road for 125 (used, off a 2001 SS). Would it be worth it to get them ported, and improve the valve springs and then throw them on when I eventually decide on a cam?

I just wanna know how much more power I could potentially get out of the 241s vs. my 853s. And the big plus is I wouldn't have to have my car torn apart while the heads are getting ported/ i'm saving for the cam and valve train parts?

 

imo i would say its not worth it. unless your current heads are damaged and you need to get your car back on the road.
save up more and get a set of TSP ported 243 castings. instead of buying and having the 241 heads worked on.

 

Well, I'm just trying to go with a budget build.. $125 for the heads and then 400ish for the porting and I figured it would be just as good

 

tsp stage 1 243's typically gain 45-50whp. 241's ported by Ai usually net 30-35whp... a budget set of ported 241's should net 20-25whp. The tsp heads are 11-1200.00 range. your lookin at spending 525 on 241's, but your only getting half the gains of the stage 1 243... Im with NemeSS, save your money for something better.

 

Yeah, I suppose... Just alot more money than I'll ever have until I graduate more than likely

 

well if the budget 241's are all you can afford right now then do it...

 

i would just buy 243 heads and leave them unported and get a valve job and possible mill them. There is plenty of power to be had with just that and could port later down the road or sell them and get better heads. 243s are alot easier to sell than 241s

 

What he said. And take out a student loan. You won't regret it.

 

I bought a set of stock 02' Z06 243's with the valve springs for $400 locally off of CL and I plan on getting rid of the springs to match the cam I eventually choose with the right springs. IMO if you are looking to gain an extra couple tenths at the track then yes get them worked. But if it's gonna be a street car that's got a set of nads, there's other places you can spend money and make it count.

The 243's flow just as well as 317's so if you are gonna buy a set of heads for a street/strip car, then don't even bother buying a set of 243's if you are going to get them worked on. Buy a cheap set of 5.3 heads and get them milled and ported. You can throw a rock out your window and hit 5 of the damn things.

 

799s came on trucks and such. I picked up a set of those. Same casting as the 243s.

 

I have some non ported 799's on my car. I wasnt even looking for heads, but came across them locally on Craigslist. Picked them up for $200, had them checked out, and bolted them up with cam swap. No numbers yet, tune will come this spring. Hoping for at least 400 rwhp N/A. Any numbers from yours?

 

Nope I just got them. Im negotiating with a couple of sponsors for some CNC time Looks like they might be taking a trip.

 

Is the only difference between ls2-243 heads and the ls6 243s the valves? The casting and everything is the same right?