5.3 head swap worth it?
#1
TECH Resident
Thread Starter
iTrader: (12)
Join Date: Jul 2005
Posts: 765
Likes: 0
Received 0 Likes
on
0 Posts
5.3 head swap worth it?
I can get a full 5.3 motor with about 115000 miles on it for $100. Heads are off it and no accessories but all covers are there. I figured I could sell everything but the heads and come out with no money invested in the heads. They are 706 castings if I remember corectly. Would they be worth swapibg onto my 99 Camaro? I have full boltons and a ms4 cam now. Of course I would take them to a mechine shop and have them cleaned and checked before I put them on and I would need to buy new head bolts and gaskets and such so that would be a little money but not bad. I would probably lightly port them as well. Is it worth the time and little bit of money to swap them out and how much power could I gain by doing so?
#4
TECH Resident
Thread Starter
iTrader: (12)
Join Date: Jul 2005
Posts: 765
Likes: 0
Received 0 Likes
on
0 Posts
I would do some porting on them myself. Smooth out the runners and such and clean up casting marks. Im pretty sure the said 706 casting. Is that possible or were they 799 casting and I read it wrong?
#7
TECH Resident
Thread Starter
iTrader: (12)
Join Date: Jul 2005
Posts: 765
Likes: 0
Received 0 Likes
on
0 Posts
How much money do you recon I will have in machine work for the larger valves and buying the valves and valve job and such has well as cleaning up the heads? Just trying to see how much I will have in everything after its al over to see if its worth it.
Trending Topics
#8
TECH Addict
iTrader: (6)
I think it varies...I have seen anywhere from $150-$300. But then I have also been told that it is better to replace the seats at the same time when going to larger valves which can get a bit expensive. It really just depends. There are shops out there that charge half that, but I have never had anything done by them. I use the guys we trust over at MTI.
#9
TECH Senior Member
You need to CNC them and change valves.
#10
Teching In
Join Date: May 2006
Location: south dakota
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
remember, 5.3 heads also have smaller combustion chambers. so they will raise your CR slightly. If i remember correctly, the 706 head had a recall for porosity in the casting, so definately get them checked first.