Jim85IROC

iTrader: (6)

I'm headed to the machine shop with my block this afternoon, but I wasn't sure what RA to have the deck resurfaced, if that winds up being necessary at all. If it turns out that I do need the deck resurfaced, what RA should the machine shop smooth it to for the stock MLS gaskets? I'll be running LS3 heads, so I'll be using the corresponding stock LS3 head gaskets.

Jim85IROC

iTrader: (6)

back to top. Somebody must know this... enough guys here seem to have a rebuilt motor!

oldguy99Z

iTrader: (2)

I haven't seen a figure for stock GM MLS gaskets.Cometic gaskets require a finish of 50 RA or better but GM gaskets are much more forgiving.I would think whatever the machine shop normally does should be fine for GM gaskets.Sorry I can't be more help.

Nitroused383

iTrader: (10)

http://www.techshopmag.com/Article/4...s_engines.aspx

vettenuts

iTrader: (4)

Mine were 25 Ra and this should be easily achieved. AFR delivered their heads this way from their milling and the stock GM block was close. Don't forget flatness, this may be even more critical for an MLS gasket.