I am putting togethor a 355 and im going to run around 10-12 psi boost aftercooled, and 100-150 nos. What compression pistons do I need and which pistons to go with? I have 6inch rods. This is a stock headed car with a cc306, and full exaust. Thanks for the help.

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1995 MYSTIC Z28
M6
T-TOPS
CHROME Y2K VETTE WHEELS
VORTECH S-TRIM
AFTERCOOLER
CC306 CAM
1.6 RR'S
HOOKER LT'S
MUFFLEX 4"
CHASSIS ENGINEERING 8 PT.
HARWOOD 2.5" COWL HOOD
NITTO 275-40-17 DR'S

 

You are going to have a problem with your setup. To run 10-12psi + N2O on pump gas you want a CR <9:1. The biggest dish I have seen is -21cc which will give ~9.75:1 with stock CC volume. I would get a set of -21cc pistons and pray a lot! Alternatively, only run the N2O with race gas.

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

Rich, I remember seeing a -31 cc dish somewhere. If it wasn't 31, it was low 30's.

 

Jesse: thanks for the info. If that's the case, I say "go for it"with the caution that some pistons with alarge dish have weak crowns.

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

keep the quench (piston-head clearance @TDC) tight, polish the chambers and piston crowns, maybe even get a ceramic coating on the crowns. That'll help avoid detonation. (also polishing the chambers will increase cc a bit)
Lastly, having a cam with a later intake valve closing point will reduce cylinder pressures.

 

Thanks for the help guys. What pistons would you recommend and where to get them? A website? THanks

------------------
1995 MYSTIC Z28
M6
T-TOPS
CHROME Y2K VETTE WHEELS
VORTECH S-TRIM
AFTERCOOLER
CC306 CAM
1.6 RR'S
HOOKER LT'S
MUFFLEX 4"
CHASSIS ENGINEERING 8 PT.
HARWOOD 2.5" COWL HOOD
NITTO 275-40-17 DR'S

 

http://www.jepistons.com/automotive.asp

Rich Krause

------------------
'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

Anyone do a search for -31cc dish pistons? I know its been discussed before on this site. Maybe they were custom.

 

http://www.jepistons.com/pdf/2002-je4-13.pdf

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

21cc dish on 355 lt1 is about 9.1 to 1.21cc dish on 383 lt1 is about 9.7 to 1

 

Why are you using a 306 for that setup?