1970442

I am rebuiiding a 455 was thinking of getting the probe srs flat top pistons,i have eldelbrock heads,my question is pump gas going to be a problem?

cutlassefi

You'll have 11.0:1+ with those pistons and that combo. If you have 93 then it might be doable with the right setup. But with 91 it would be a real stretch.

Jmo

dfire25

My set of used pistons for sale cheep.
https://classicoldsmobile.com/forums...r-pistons.html

1970442

91 i think is all thats here,what combination will give 10.5.1 ? that should be fine on 91 octane?Been looking at the keith black and weisco they are 15.00 cc dish what does that give for compression ratio?

cutlassefi

Right about 10-10.25:1.

Shradezz70S

I just did a 455 30 over and I used icon forged pistons with eldelbrock heads . 10.50 comp also went with an air gap intake can't wait to here it but probably won't happen this year

Gary M

If the Keith Black pistons you speak of are the hypereutectic, My builder told me the are fragile and if you get spark knock for any reason they can shatter. .. Mine were good but I had him remove them just to be safe. He said newer cars have them but the computer retards the ignition to prevent shattering. Good luck.

cutlassefi

He said "Icon Forged pistons" not hypereutectic.
And you might want to get another builder because he doesn't know squat when it comes to hypereutectic pistons. They don't like high rpm, and major power adders, that's all. NO piston likes detonation.

Gary M

1970442 was the post I was responding and he did not mention forged. I'm not looking to argue with any one, just share what I was told. To the OP ,good luck with your build,I'm out.

cutlassefi

I don't want to argue either. But then somewhere along the way, without asking, you assumed that Probe SRS pistons are hypereutectic. They're not, they're forged. Don't assume, ask.

Smitty275

I'm gonna say this is where that disagreement started.

cutlassefi

Gotcha, but Icons are Keith Black pistons as well. Tomato, tomoto I guess.