hey guys as some of u kno my car recently craked the number 4 piston. and it scratched the c ylinder wall any idea what i should bore it. also how much if any horsepower difference will i notice from 10 over or 20 over or 30 over?

Thanks
Brian

 

there is a minimal gain from boring out the sleeves. i suggest honing to get out the scratches and leave it at that

 

dont want to bore out too much

 

well he did hone it but suppsedly the scratches were to deep

 

idk about new stuff but my dads 68 charger cracked a ring and all it needed was a .30 grind. honestly, there was alot more power in that 440 after the bore...4 more cyls tho

i agreee with blazin07

 

bore it enough to get the scratch out. You wont get much of a gain from boreing

 

You do not want to over bore this engine.

It will mess with the structural integrity.

 

the ecotec engines dont have very thick sleeves, the max id want to bore it is 0.010" over, anything past that and you should have the sleeves replaced.

 

If that much.

I would advise replacing the sleeve in that one cyl, much safer that way. There isn't a lot of material in these sleeves to begin with.

 

i agree with what everyone is saying if you cant get it out boring .010 u should replace the sleeve.

 

Heh, mine blew again last night. Cylinder 4 too.

 

^ that sucks dro, looks like darton will be getting a call....

 

god damn, again! I'm guessing this is the 2nd time it went?

 

Yep.

The 'rebuild' was fucked anyway, each cylinder had a different compression readout then the rest. Always sounded funny when fully warmed up. Wanted to stall at times when coming to a full stop. Instead of messing with warranty this time I'm gonna order diamonds, cometic head gasket and the arp studs. I can't get my header or hpt cable now either so I figure I'll head up to Paul if he doesn't mind and have him tune it the right way.