602 crate engine, replace piston?

Eliminator SS

Veteran Member
Lifetime Gold Member
Nov 14, 2002
2,945
South East, Nebraska
Should I replace this piston or run it? OR replace all pistons with forged ones?
20200721_212411.jpg
20200721_212401.jpg
 

biker

Veteran Member
Gold Member
Dec 7, 2014
4,687
Canada
What the heck you do to it? Did u lose a head gasket? What's your induction? Naturally aspirated? Any nitrous? I know you said crate motor, but have you changed the cam? Compression? RPM range?
 

Eliminator SS

Veteran Member
Lifetime Gold Member
Nov 14, 2002
2,945
South East, Nebraska
It's an ex imca 602 crate engine
Finished its last race in the top 5 even with that hole in the valve. I'm guessing something from the carburetor came loose and went through the engine.
I'm installing a 480 lift cam that was suggested by a few different Vortec guys and will be keeping the compression as close to 9.5-10 :1 as possible even if I replace the pistons. It's going to go into my 79 Z28. Just a nice little hot 350.
 

1980RS

Veteran Member
Jun 17, 2006
5,980
MN
If you are going forged, make sure you have the right piston to wall clearance. Cast pistons will be tighter and forged may scuff without the proper clearance.
 

dcozzi

Veteran Member
May 1, 2002
4,442
Phoenix, AZ
Looks like whatever went into the cylinder went right out the exhaust along with that piece of valve. The piston and cylinder wall look good from what I can see in the pic. I would fix the head/valve and run it.
 

G72Zed

Veteran Member
Sep 8, 2015
3,745
Canada
If you run the same pistons, just make sure you did not pinch the top ring on that piston from that piece getting hammered by the piston.




Inked20200721_212411_LI.jpg
 

Eliminator SS

Veteran Member
Lifetime Gold Member
Nov 14, 2002
2,945
South East, Nebraska
The plan I've decided on is to pull all of the pistons, give the cylinders a quick hone, clean and inspect the pistons, and reinstall with the original pistons and rings if they aren't damaged.
 

G72Zed

Veteran Member
Sep 8, 2015
3,745
Canada
Good plan, at least you will know if that piston took a hit, better safe than sorry, and your 1/2 way there anyway. Hope everything works out for you.
 




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