98ws6blk

I picked up some stock assembled 799 "LS6" heads.

What should I do to them before i put them on while on a budget?

Here's what I'm thinking:

*VERY light home porting: bowl blend, smooth any casting, smooth rocker bulge a little, smooth/polish exhaust port

*Mill/thinner gasket to bump compression to 11:1

*Valve job at a local speed shop

*Possibly go to a larger valve?

I'll definitely go with new springs since I'm changing cams

thunderstruck507

iTrader: (18)

For a budget, some light cleanup and mill with a valve job IMO.

Some of those heads look horrible as far as casting flash so look them over and knock all that crap down.

I would keep stock valves if you are on a budget. Depending on how much they are going to charge you to mill and do the valve job it might be worthwhile to price out a lower price CNC job while you are at it...you won't regret it. I wish I had done that instead of messing with them myself.

96capricemgr

iTrader: (1)

I would not have any machining done unless you are having it done completely and well. A light hand porting now might sound like a good idea but then when you get more serious nobody is going to want to use them as cores if they are already screwed with.

KCS

iTrader: (20)

I would just go with a good valve job for the stock hollow stem valves, blend in the bowls and open up the throat, and then mill them a couple cc's. That will put you on par with just about any CNC ported head depending on the valvejob.

98ws6blk

Hum...I hadn't thought about the light porting keeping them from being used as CNC cores...

Steve01SS

iTrader: (43)

Valve job, deck em and bolt em on with some good valve springs.

96capricemgr

iTrader: (1)

Even milling or the like complicated CNC setup, some shops might be willing to deal with it but some are only going to want unmolested cores.

Someone said something about the Hollow stem valves. I thought those were on SOME 243s but not on 799s.

98ws6blk

Yeah, it has the normal valves.

KCS

iTrader: (20)

Yeah that was me. I read over the 799 and thought he said they were LS6 heads, in which case I would just go with bigger valves, like 2.02". I used 2.02" intake and 1.60" exhaust valves in a set of 241's and made over 400whp turning less than 5200 RPM and with the ports untouched other than a few hours cleaning up the bowls.

98ws6blk

My bad. Just normal 799's. So you think the bigger valves are worth the cost?

batboy

iTrader: (6)

If you are going to the expense of CNC porting, then putting in bigger intake valves is a no brainer. But, it's not what I would call low budget. A good multi-angle valve job and milling the deck is a good bang for the buck.

96capricemgr

iTrader: (1)

Some of the best most consistent stock casting results come from shops that like to keep the stock valves.

KCS

iTrader: (20)

Absolutely. A valvejob for the 2.02"/1.60" valves is the same as the smaller OEM sizes, the difference is just the cost of the larger valves.

Grr

iTrader: (2)

stock valves are fine in a 3.9" bore block, dont waste your money

mill, have the machine shop do a decent valvejob and clean the bowl a little. No more than $300 bucks worth for all of it. if your doing work at home, spend ALL of your time on the exhaust port. there is way more power to be made there than the intake side since they are already good ports.