Abdullah

iTrader: (2)

i want to port a set of LS heads myself. the 5.3 heads might be a little difficult to get them here in Kuwait but i can get the 5.7 LS1 heads easily. how safe i can go in milling the 5.7 heads and using stock 2.00"/1.55" valves maybe using 0.030" or 0.040" head gaskets and stock 346 short block (stock pistons). can i do 11 compression or more with no P to V issues? the cam is the latest TSP 233/239.

btw, what is the cc of the stock LS1 346 pistons?

thanks for help.

Dmoney

iTrader: (22)

Without milling and knotching the pistons with that cam, I don't think you'll be able to get that high of compression. I'm running LS6 heads milled to .030, with cometic .040, -2cc on the pistons, G5X-2 232/240= 11:1 compression.
Use this and play with it and see if you can.

http://www.c5frc.com/calculators/Com...Calculator.htm

orangeapeel

iTrader: (18)

You might have to get some pistons to get that ratio without milling. OR....and don't do this or take me seriously. Do't use a head gasket.

orangeapeel

iTrader: (18)

They don't come stock relieved. 0 cc

Abdullah

iTrader: (2)

thanks for the replies.

i have a question : do the stock pistons in 346 LS1 get out of the hole? i.e. higher than the block deck? if so by how much?

thanks

Viper

iTrader: (6)

Yes, they are out of the hole stock, typically .007-.010.