sleeper99z

So im starting a budget lq4 build and im on the fence if i should go with the d.s.s pistons for what im doing or does anyone have a better suggestion? My concern is that the pistons are -5cc and im going for 11.3:1 with prc stage 1 ls6 heads that have been only cleaned on the deck for 63cc chambers. I plan on having the heads milled and running .040 head gaskets to bring up compression but didn't want to mill more than .020. The compression im looking for is based on a dcr of 8.5x. I can get the pistons for 400 minus rings and i plan on making 500+ flywheel with an occasional 120 shot. I really want to get my parts ordered but i dont want to regret what i get and have to send anything back.

k_garretson23

iTrader: (8)

I built a 60 bottom end for boost then switched gears back for nitrous. I have -11 cc pistons, had my heads milled to 56 cc and a .040 head gasket that puts me right at 11:1 cr. I dont see you having any issues running what you have described and you should be able to meet your compression goal

sleeper99z

How much did you have to mill the heads? Im trying to avoid taking too much material off so the intake still fits rights. Im also being cautious not to have something more prone to blowing head gaskets. Does anyone know of a comparable forged piston that has less than -5cc reliefs. I usually see -2. I just cant justify wiseco for what im doing.

sleeper99z

Another thing im trying to decide on is rings. I see that sealed power moly rings are pretty cheap. Can anyone see a problem handling the nitrous. They're moly coated iron top, iron (i guess ductile middle) and cast iron bottom.

sleeper99z

Nevermind on the ring question. I read that would be a really bad idea since the moly would flake off

k_garretson23

iTrader: (8)

my heads were milled a lot. Theyre mamo motorsports 235 heads. Speaking with tony I requested to go to mill them to 55 cc for a little more compression but he advised I go 56 to be on the safe side. Because they are an aftermarket casting Im unsure of how similar it would be to a factory casting head

shadowfirep

if you want to go with those pistons, and you are already plan on replacing the cam (are you?), then you can find a cam with a larger intake duration to lower the dcr a bit.