foxsl

iTrader: (1)

I stumbled upon a thread where a reputable name on here suggesting to skip milling when doing a 243/799 head swap but to go with a 0.041" thickness headgasket instead on a 6.0 lq4. Has this been done successfully with no intake manifold seating issues or other unmentioned issues? The lq4 is a 2005 in case that matters for the piston being used.
Thanks

Kawabuggy

iTrader: (1)

I recently built my engine in exactly that manner. I have a LQ4 block that we bored .030" over, put in flat top pistons, and I'm running 799 heads with Cometic .041" gaskets.

I also had my block surface decked to square it up. Not sure what my final compression ratio will be but the heads came in at 64.4CC's average.

I have not bolted on my intake manifold yet but I'm not expecting any issues with gasket seal/alignment.

foxsl

iTrader: (1)

Hopefully a thinner headgasket like this won't cause any sealing issues at higher cylinder pressures in NA form. I truly don't even know the thickness of a stock replacement but the stock part # is felpro 26192 PT

brandon6.0

iTrader: (32)

I had a lq4 with advance inductions 243s that were milled to achieve 11.2:1 compression. I also ran a .040 cosmetic gasket without issues with a stock intake. the added quench did help it run stronger. I had a sns stage3 tick cam in that engine as well.

foxsl

iTrader: (1)

Great to hear, was the 11.2:1 based strictly off the head milling (if so, how much did they mill) or in total after considering the 0.040 gasket? Thanks

brandon6.0

iTrader: (32)

I wanna say it was after milling heads and using a cosmetic .040 gasket. I cant remember how much we milled the heads to.

foxsl

iTrader: (1)

All good, I just wonder why lots of people say to stay away from Cometic, but you having no issues is good to hear. Cometic has lots of options to fine tune the HG dimensions like a 4.00 bore diameter with a 0.36" compressed thickness, also available in 0.040" and 0.041"....I do like that selection as the best I could find on the Felpro headgaskets to what I would like is a 4.045" bore diameter and 0.048" compressed thickness

big hammer

Copper coat the gaskets. You will have no issues with intake alignment.

foxsl

iTrader: (1)

Going to go with a 0.010" mill and the cometic C5751-040 mls head gasket with 4.060" bore diameter and 0.040" thick. That should either put me at a CR of 10.36 or 10.7 depending on who you ask. I've never copper coated gaskets but I'll try that if it doesn't alter the thickness.

brandon6.0

iTrader: (32)

I usually copper coat all my mls headgaskets. Helps for sure!

A.R. Shale Targa

iTrader: (2)

I calculated 11.6:1 with (.010" mill and 63cc) for the .040" gasket