#1 Junior Member
Join Date: Nov 2005
Location: columbus,ohio
Posts: 20
Car: 1987 iroc z28
Engine: 355 vortec HSR
Transmission: T-5
Axle/Gears: 3.45
pistons?
Is there any way to tell what kind of pistons are in my 355 shortblock? I bought the engine awhile ago and the seller dident know anything about it. But everything looks real fresh, i would like to know before i consider nitrous
#2 Senior Member
Join Date: Mar 2007
Location: Central Illinois
Posts: 343
Car: 89' Pontiac Firebird
Engine: L03 carb Ported #87s new shortblock
Transmission: 700r4
Axle/Gears: 2.73 open
Re: pistons?
is they're any part number on the top of the pistons?
#3 Junior Member
Join Date: Nov 2005
Location: columbus,ohio
Posts: 20
Car: 1987 iroc z28
Engine: 355 vortec HSR
Transmission: T-5
Axle/Gears: 3.45
Re: pistons?
theres no part number that i can see
#4 Member
Join Date: Nov 2006
Location: alberta,canada
Posts: 217
Car: 91 formula ws6
Engine: 1 peice roller scat 383 4 BOLT!!
Transmission: 5 speed
Axle/Gears: 3.42
Re: pistons?
maybe you can see a number on the inside of the pistons from the botom, if not pictures or removal of them are needed.
#5 Senior Member
Join Date: Mar 2007
Location: Central Illinois
Posts: 343
Car: 89' Pontiac Firebird
Engine: L03 carb Ported #87s new shortblock
Transmission: 700r4
Axle/Gears: 2.73 open
Re: pistons?
he doesn't have a receit for the machine work does he?
#6 Junior Member
Join Date: Nov 2005
Location: columbus,ohio
Posts: 20
Car: 1987 iroc z28
Engine: 355 vortec HSR
Transmission: T-5
Axle/Gears: 3.45
Re: pistons?
I found a number inside the skirt of the piston it reads H
Last edited by 355tpiz; 05-03-2007 at 08:53 PM .
Reason: error
#7 Junior Member
Join Date: Nov 2005
Location: columbus,ohio
Posts: 20
Car: 1987 iroc z28
Engine: 355 vortec HSR
Transmission: T-5
Axle/Gears: 3.45
Re: pistons?
#8 Moderator
Join Date: Jan 2000
Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 19,768
Car: 1984 Z28 Hardtop / 1988 IROC T-top
Engine: 383 Carb / 305 TPI
Transmission: 4L60 / T-5
Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt
Re: pistons?
They're budget hypereutectic rebuilder pistons. You could put a modest amount of spray on them if you were careful.
#9 Member
Join Date: Nov 2006
Location: alberta,canada
Posts: 217
Car: 91 formula ws6
Engine: 1 peice roller scat 383 4 BOLT!!
Transmission: 5 speed
Axle/Gears: 3.42
Re: pistons?
id say 100 shot max, and dont do it to often . they aint no forged pistons!
#10 Junior Member
Join Date: Nov 2005
Location: columbus,ohio
Posts: 20
Car: 1987 iroc z28
Engine: 355 vortec HSR
Transmission: T-5
Axle/Gears: 3.45
Re: pistons?
So id probably be better off to not run nitrous.
#11 Supreme Member
Join Date: Jun 2003
Posts: 1,420
Re: pistons?
they arent that bad.... you can run a 150 shot on them fairly safely. well, as long as you keep it tuned right.
#12 Senior Member
Join Date: May 2006
Location: Maui, Hawaii
Posts: 1,852
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
Re: pistons?
150 max.. make sure it has nice ring gaps and the tune is spot on.. too rich or too lean will destroy those pistons..
__________________
1984 Trans Am
385sbc(RIP)/t-5/4.30-9"
1.69-7.44-11.65 @ 116
next up-->383 with mild upgrades
ThirdGen
1992 Camaro
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