Bit of progress this weekend. No pics, I spent all of Saturday moving to my new apartment in North Buffalo so my camera is buried somewhere.
Big thumbs up to Mike93 for letting me borrow his engine hoist. Works like a charm.
Got the garage itself closer to where I want it***8212;air compressor mounted, bench in place, lights installed, power strips/electrical, the usual. Started to disassemble the motor a bit more on Sunday but my Craftsman Air ratchet took a dump on me. I have a pile of tools I need to have warrantied by them next time I go in.
Got the engine mounted on the stand
Pulled off both motor mounts
Removed 3 broken exhaust manifold studs via welding a nut on method (1 broken stud still remains. It***8217;s 2mm below the head surface. I***8217;ll have this done professionally as I don***8217;t want to screw it up).
Pulled all 8 plugs, they are original and didn***8217;t look too bad.
Cleaned up the heads with a razor blade
Tried to remove the crank pulley bolt with my impact gun, didn***8217;t even budge. Those things have to be insanely tight.
I plan on having the heads off by the end of the week. Would like to have them cleaned and milled .030***8221; to bring compression back up to around 10:1 or so. I***8217;ve read that the 317 heads are very similar to LS6 heads, minus having a larger combustion chamber. Rather than buy new higher comp heads, I want to just mill them to reduce the size of the combustion chamber (to 66cc). Have also read that usually .006***8221; material removed is about 1cc of chamber volume.
My source:
http://lsx4u.com/lsxinfo/heads.html
Casting Numbers 241, 806, 853
Head: 1997+ LS1 5.7 Liter Passenger Car
Material: Aluminimum
Part Number:
12559806 (1997-98) Chambers = 69cc
12559853 (1999-00)
12564241 (2000-03)
Combustion Chamber Volume: 66.67cc
Casting Number 317, 035
Head: 2001+ LQ4 and LQ9 6.0 Liter Truck
Material: Aluminimum
Part Number:
12562317 -LQ4
12572317 -LQ9
12572035 -LQ9
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1 LQ9 Flat top pistons
Compression Ratio: 9.6:1 LQ4 Dish piston
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
So, I know how much I need to mill to go from 317 head (71.06cc) to 241 head volume (66.67cc), but how do I calculate compression ratio from that?
I guess the other option would be to buy 241 heads or 243 heads and sell the 317s, but who knows if 317s are a hot commodity.
Anyone recommend a good machine shop that can do this? I read online that TSP does this service for $75, but they aren***8217;t local.