1994Z28Lt1

iTrader: (1)

http://www.summitracing.com/parts/ml...make/chevrolet

Right now I got my motor out getting freshened up with the stock crank, my heads are at AI getting their 200cc top end package

My motor is at the machine shop getting checked out and due to 150,000 hard miles she is getting punched .030 over and am in need of a piston and ring set with a set of 6 inch rods.

I was specifically looking at the the compression height at 1.25" from my calculations after the block gets straightened up this will leave these pistons in the hole about .020 -.025" and with a .026" head gasket will give me a quench of about .046 to .051" which is safe but is it too safe? This setup would give me about 11.5-11.6:1 compression as well.

Anybody have any advice, opinions? In the interest of time i'd like to get these ordered asap, any and all advice welcome!

96lt1m6

iTrader: (31)

Great piston

RamAir95TA

iTrader: (2)

I would try to pull your quench down tighter to .035"-.040". Better flame travel and turbulence resulting in more horsepower. Keep in mind with a tighter quench the accuracy of the tune will be much more important because richer mixtures burn slower while lean mixtures burn much faster.

Tune, tune, tune, and you'll appreciate the results.

TravisMcGill2000

iTrader: (2)

Those are good pistons. Like ram air said close your quench up. Look at the cp bullet pistons. I believe there lighter and little cheaper.

1994Z28Lt1

iTrader: (1)

So for the street driven lt1 guys. With these pistons, and AI's 54 cc chambers and .026 head gaskets would it be wise to tell the machinist to leave the pistons in the hole about .015" giving me a quench of ~.41" and a compression ratio of about 11.74:1? would this be too tight? sometimes in my area its hard to get gas better than 91?

or would it be better to go with their 56cc chamber, have the pistons .010 in the hole, for a quench of .036" and a compression ratio at 11.6:1? Would this quench be cutting things a little close for a street driven, m6 car that will see more than 6500 on occasion?

bufmatmuslepants

iTrader: (3)

How hard is it to get 92 or 93? Hard enough that you'd HAVE to use 91 alot?

quik95lt1

iTrader: (7)

go for it nothing wrong with them

Low N Slow

iTrader: (4)

Those are pistons AI recommended to me. Mine are .012 in the hole with .026 gaskets, you should have no problem running 91 octane if your tuner knows what he is doing.