383lt1impala

iTrader: (33)

ok my 383 is at 9.5 compression with stock unported heads and i would like to get some ai or le heads but if i do my compession will go down even more and i am not wanting to boost it. so what pistons should i go with i know it should be higher than stock compression but what pistons are good out there...

96lt1m6

iTrader: (31)

that really depends on your heads.are you using the iron heads or the aluminum heads.
inexpensive speed-pro 2491's are nice 10.76 cr w/64cc 46.00ea.
you may see 11.2 w/factory head.

383lt1impala

iTrader: (33)

ima go aluminum i read on the other thread the they are better right...

96lt1m6

iTrader: (31)

i like aluminum heads.
the stock B-body Lt1 heads flow very well but they are cast.weight reduction and the ability to run more compression goes to the aluminum.
LE or AI can handle your heads for sure,be sure to have the intake matched up as well.

383lt1impala

iTrader: (33)

where is the link to the pistons i cant seam to find them.

96capricemgr

iTrader: (1)

Ported GM aluminum heads would raise compression a fair amount for you.

You know who I recommend and IMO the 11.9s I was running today at a 29.29 absolute barometer says I am right.

96lt1m6

iTrader: (31)

HMMMMMMMMMMMM DONT TELL ME UUUMMMMMMM its on the tip of my tongue AI for the win Dwayne

383lt1impala

iTrader: (33)

cuz i am going to go with an ai package i just need a good set of pistons and hopefully theres differance cuz **** right now im only pulling 220rwhp and 330rwtq...

96lt1m6

iTrader: (31)

here ya go
http://www.jegs.com/webapp/wcs/store...55727_-1_10219
http://www.jegs.com/webapp/wcs/store...50615_-1_10219

383lt1impala

iTrader: (33)

i checked it and the 383 pistons with more ported heads the compession will almost be the same as i got right now...

aboatguy

What's your compression if you use 52--53 cc cambers and .027 head gaskets?


Another person that agrees with Dwayne!!!!

96capricemgr

iTrader: (1)

What are you using for numbers to calculate compression. My heads are milled a bit to get compression on the stock shortblock, they are just over 53cc, stock aluminum heads are 54-56 or so with some claims of 58cc. Most pistons use 64-76cc when giving compression specs in catalogues because those are common gen 1 motor head sizes.

Formula350

iTrader: (3)

I'm not quite following how having your heads ported, will result in LESS CR. Unless you are, for some reason (boost?) having the compression chamber milled out a bit o_0 If you want a bit more CR, get your block 0-decked and heads shaved a bit, along with the Impala head gasket.

383lt1impala

iTrader: (33)

ok i see now those pistons will work for me i just thought my head ccs were bigger..