***head question ?????
Thread Starter
Instructor
Joined: Jul 2012
Posts: 222
Likes: 0
From: Salisbury Maryland
***head question ?????
i am looking at a set of 799 heads. these are suppose to be the same head as the 243... Right? they are ported heads complete with vales and springs. Are they worth $875.00. thanks for any info guys
Racer
Joined: Jun 2012
Posts: 459
Likes: 1
From: LAUREL MD
Heads
I ASKED A SIMILAR QUESTION RECENTLY. NASSYBLUE RESPONDED WITH:
Very little.
1) 799's are rest assured not to have the infamous valve springs that fail
2) the LS6 version of the 243's come with sodium filled valves. These tend to be worth more $$.
HOWEVER, THE SODIUM FILLED VALVES CAME ON 2002 AND LATER APPARENTLY.
SO, THE 799'S HAVE BETTER SPRINGS BUT 243'S HAVE BETTER VALVES (2002 ONWARD). AS FOR PRICE, I AM NOT SURE.
Very little.
1) 799's are rest assured not to have the infamous valve springs that fail
2) the LS6 version of the 243's come with sodium filled valves. These tend to be worth more $$.
HOWEVER, THE SODIUM FILLED VALVES CAME ON 2002 AND LATER APPARENTLY.
SO, THE 799'S HAVE BETTER SPRINGS BUT 243'S HAVE BETTER VALVES (2002 ONWARD). AS FOR PRICE, I AM NOT SURE.
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Sodium filled valves where unique to the LS6. The 243 heads that came on the later LS2 do not have them.
The LS6 243 heads are therefore more expensive. I just picked up a set of LS2 243 heads for 400. The valves are not worth the 700-800 people are asking for un-rebuild LS6 style 243's.
Just go for a set of 799's or LS2 243's for around that price and throw some new springs on and deck the surface.
Id say that price is good if they are a fresh rebuilt set and the port is a good one. It depends on who did the port.
The LS6 243 heads are therefore more expensive. I just picked up a set of LS2 243 heads for 400. The valves are not worth the 700-800 people are asking for un-rebuild LS6 style 243's.
Just go for a set of 799's or LS2 243's for around that price and throw some new springs on and deck the surface.
Id say that price is good if they are a fresh rebuilt set and the port is a good one. It depends on who did the port.
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
They will be an upgrade over the LS1 heads either way. But there is a special technique to porting these already good heads. There is such a thing as hurting performance if they are over done.
Thread Starter
Instructor
Joined: Jul 2012
Posts: 222
Likes: 0
From: Salisbury Maryland
I guess its a 50/50 chance then unless he is sending them to a well known machine shop who has a track record of producing good work. i need to ask him who is doing the porting and if he gets pissy then i just wont buy them. i want to do it right the first time or as right as i can get it anyway. Thank you for your input i really appreciate your opinion. helps me out alot!!
Burning Brakes
Joined: Sep 2009
Posts: 1,239
Likes: 2
From: Naples FL
St. Jude Donor '12
Very true. If he did them I'd pass for sure. I'd ask for a flow sheet. If there is no flow sheet, good chance it was not professionally done.
Thread Starter
Instructor
Joined: Jul 2012
Posts: 222
Likes: 0
From: Salisbury Maryland
i fopund a set of brand new 799 heads forsale , do you know how much hp this head will give me over my stock 806 heads.They are new heads not ported. worth the swap over the 806
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Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Just a straight swap will do about 10whp. With a cam it will be worth more like 25-30whp of the power increase.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
if your doing all that work maybe a set of PP 243 heads would be a better option.
799 heads do not flow much more than stock 241 heads if at all.
243 heads are much better. Spring failures are higher on forum participants then in real life. PPL just complain. Stock springs are only good for a cam lift of about .550.
Putting on some better springs, comp 918s, or Pac 2018 springs right a way is a good thing. but NOT double springs. Too much seat pressure for the light wt values. Lt wt values are for high rpm use above 6500 rpms.
Better springs will get you to a cam lift of .600 which is more then enough for 243 heads. 243 heads max flow out about a cam lift of .580 so no reel need to have a cam lift above that.
PP 243 heads will flow quite will up to around .600 maybe a bit more too.
Good Luck
799 heads do not flow much more than stock 241 heads if at all.
243 heads are much better. Spring failures are higher on forum participants then in real life. PPL just complain. Stock springs are only good for a cam lift of about .550.
Putting on some better springs, comp 918s, or Pac 2018 springs right a way is a good thing. but NOT double springs. Too much seat pressure for the light wt values. Lt wt values are for high rpm use above 6500 rpms.
Better springs will get you to a cam lift of .600 which is more then enough for 243 heads. 243 heads max flow out about a cam lift of .580 so no reel need to have a cam lift above that.
PP 243 heads will flow quite will up to around .600 maybe a bit more too.
Good Luck