Abdullah

iTrader: (2)

any one with experience who has ideas on how to port 243 heads specialy in the bowl area? also how to port match LS2 intake manifold to 243 heads?

thanks for help.

01ssreda4

iTrader: (96)

Tip 1, get a set of practice heads to work on first.

Abdullah

iTrader: (2)

i will get 243 heads from the junk yard.

Abuckeye

The bowl shouldn't be widened anymore than 80% of the valve size. The short turn is where you can make a huge difference. Just smooth the turn and get rid of any high spots. The intake side can be improved by lowering the floor a little. Be careful gasket matching. Most people take out too much material. Leave yourself some wiggle room because the header when bolted down will distort. The exhaust can be opened up quite a bit so be ready to hog out some material.

t-trimz28

iTrader: (3)

Good tips here. I would like to add that on the short turn, take a piece of emery cloth (or even a strip of belt sander paper) about a foot and a half in length, and run it back and forth along the short turn. It will quickly and easily remove any high spots and rough areas and make a smooth transition.

mark21742

Here are some stout pics for you

mattster03

iTrader: (22)

those pictures are cool, but are either of those actually ported? they still look factory cast to me?

mark21742

Stock, but shows where you can and can not cut....a friend of mine uses this "chunk" of a head to flycut pistons in the block...I used them as a reference when I ported mine so I wouldn't hit a water jacket

garygnu

I have a feeling you won,t find too many 243 heads in the salvage yard.you can get a set of heads of a 5.3 (free)to practice with.there are a couple of DIY head porting threads with pics .take it slow and post pic on here and the head porters will steer you in the right direction.

mattster03

iTrader: (22)

ahhh ok, yup knowing where the water jackets are would most definitely be helpful. awesome picture.

1BADCTS

iTrader: (17)

5.3 heads for free?

Aren't these the 799 heads that are the same as the 243's?

BlueBird346

iTrader: (13)

Yes those two are the same, though I doubt you would find either in a junkyard.

Vexzer

iTrader: (1)

Careful for the water jackets, I went swimming on one of mine.

01ssreda4

iTrader: (96)

Stop giving incorrect info. 5.3 heads are NOT 243/799 heads. 799/243s are sometimes found on 5.3s, but are not "5.3" heads.

5.3LJimmy

iTrader: (10)

All 07-up 4.8/5.3's have either the 243 or 799 casting, so technically now they are always found on 5.3's. It may not be what comes to mind for you when someone says 5.3 heads but if you go to the dealership and pop the hood on any new 4.8/5.3 equipped truck you won't find a "5.3 head".

BlueBird346

iTrader: (13)

Thats not what I was saying. I was informing him that the 799s and 243s were the same. Maybe I should have been more clear.

Abdullah

iTrader: (2)

i meant i can find too many 799 heads in the salvage yard here in Kuwait because we have the australian caprice 2007 and up that has LS2 engine with the 799 heads.

any one can give tips and hints on how to port match LS2 intake manifold to 799 heads?

JustAnotherZ

You do pretty much the opposite of this and you'll see some success!

You want the throat at 90-91% on BOTH intake and exhaust. The bowl will be roughly valve size. The short turn on 243s can be layed back and will just keep picking up flow. Don't touch the floor other than the SSR, the gain is in the roof line.

Abdullah

iTrader: (2)

thanks for the tips. i have questions , what do mean by "laying back" the short turn? and what is SSR?

thanks.

01ssreda4

iTrader: (96)

The point was a "5.3" head and an "LS6 style" 799/243 head are different castings with different numbers. They terms don't need to be used interchangeably.