06chevy5.3

iTrader: (5)

My pistons should be here friday from wiseco, but i still need to get some head gaskets... The guy from race engineering where i bought the pistons from told me that my compression will be 10.4 to 1 with the pistons and the 61cc chamber in my stock heads with a stock gasket....

Dont know too much about compression ratios, but i do know too high with forced induction is not good....

I wana get around 15lbs of boost which is prolly max for the blower can i leave the compression ratio where it is at 10.4 to 1 or does anyone make a aftermarket thicker head gasket to drop the compression ratio?????

Also would you guys recommend using arp head bolts too?

00ChevyScott

iTrader: (10)

A set of 317 heads would drop the compression a good amount.

99ta

iTrader: (9)

For big boost I recommend ARP head studs!!!

LsxCody

iTrader: (3)

Running that much boost I would get a set of 317s like mentioned above.

LsxCody

iTrader: (3)

Or some ls6 heads

trever1t

iTrader: (14)

I'd do the LS6 243's. Blowers like a bit more compression

silver-mod-o

iTrader: (15)

Look up Cometic and see what they can do for the thicker gaskets.

ARP head studs would be a must as well for reliabilitys sake.
As far as the heads are concerned, 317s will cause valve shrouding on that small of a bore. I'd personally do some 243s... Shoot for a compression ratio for a hair under 10:1

Could Wiseco put bigger valve reliefs or a dish in them maybe to drop some compression??

old motorhead

iTrader: (10)

243's have less combustion chamber volume, but do they unshroud the valves any?

Casey2323

iTrader: (14)

u plan to run a decent size cam?? 220? nothing was said/ask about camshaft....

silver-mod-o

iTrader: (15)

They come stock on 5.3's so I'd say yes... The 317s aren't terrible, but they'd need to be massaged to fit properly as their made for a 4" bore ideally.

I run them on the 3.906 bore of my 347 but they've been worked over by WCCH specifically for this setup.