Before Heads get installed
Apr 14, 2017 | 05:22 PM
#11
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Valve lapping compound, valve stem seals and either a small piece of rubber hose on the end of the valve and in a drill, or a valve lapping tool(two suction cups on a wood handle)... take springs off, remove valve seals, apply small amount of compound to head of the valve, turn valve a few times against the seat, does not take much, if you use the drill method, pull the valve against the seat lightly while the drill is turning it maybe twice for about a second each, check and make sure there is a consistent ring of compound on the seat and valve wipe it off and go to next valve... however keep in mind that a gm doesnt recommend lapping valves, and the lapping compound will eat a seat and the face of the valve quickly! If the heads truly have 65k on them and the valves dont look bad, honestly i would throw them on and run with them, if you want to make sure the valves are sealing, turn the head upside down and fill the combustion chamber with water, if you lose water you have a leaking valve, if it holds youre good!
Apr 17, 2017 | 06:57 PM
#14
yea there is nothing to it. IF they were mine id go ahead and install a set of good springs with new seals. Also if its in the budget have them milled to gain compression. That should help a lot!
Apr 18, 2017 | 09:31 PM
#15
Sounds like you have a 99-06 truck . If so the heads need to be milled down .030 to get back to stock compression ratio. The 243 have 64cc chamber vs the 706 61cc combustion chamber. Just bolting the 243s on will drop compression and be lazy
Apr 20, 2017 | 12:52 AM
#16
I just bought some 243 heads because my castech 706 heads cracked. The 243 heads are used and are said to have 65k miles on them. What do I need to do before I just stick them on my block and bolt everything back up? What is recommended? I don't have any money to port them out wish I did.
If you are near the Houston, Texas area I can get you fixed up with whatever they need.
Apr 21, 2017 | 07:44 AM
#17
$800 to machine a set of heads is insane...sorry...not sorry...even in Sarasota, FL where there are two machine shops cornering the market, those turkeys want $475 to clean, pressure test, surface, valve job, and reassemble.
Apr 21, 2017 | 04:16 PM
#19
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Is it a big deal to loose on some compression? Will the better flow of the head make up for the lost?
Apr 21, 2017 | 04:19 PM
#20
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Man I'm 30 miles south of Seattle, WA I just bought the 243 heads from a guy in Houston actually lol. Over here it's hard for you guys to believe but Chevy and LS stuff isn't big over here. I feel like I'm a Texan at heart with my guns, truck, and overall life style. I am constantly eye balling houses and land in Texas. Over here I just bought a $230,000 house built in 1953 that was recently remodeled 3 bedrooms 2 full bath 1/4 acre of land and detached 2 car garage in the ghetto of ghettos in WA at least called Tacoma. A $230,000 house in Texas is about $600,000 over here.