Forged pistons available in stock bore that'll fit OEM 1990 rods???

[turbodoug]

I cracked a piston. This was due to incorrect base timing, which caused detonation at only 11* timing advance. It didn't detonate for long, but the damage has been done (compression test cyl 1 = 76 PSI).

I have another stock block that's ready to drop in, but I'd like to throw a set of forged pistons in there while I'm at it. Does anyone make a forged piston that'll directly work with stock 1990 big rods and stock cylinder bore? If so, are the pistons sized properly with enough clearance for a stock bore cylinder? This block doesn't have time to go to the machine shop.

Any info would be greatly appreciated.

BTW- My setup is a complete 1990 6-bolt with ARP studs, HKS 264 cams, EVO 3 16G turbocharger, FMIC, full stand alone fuel & spark, ACT 2600 clutch, aluminum flywheel. These parts are the reason I'm looking for forged pistons. Expecting to run ~20 PSI daily. Anyone ever tried a similar setup on a stock bottom end? Think it'll hold?

 

[99gst_racer]

I would really recommend having that other block bored .020 over.... Did you at least have a machinest check the cylinder wall roundness?

I believe JE offers some 8.5:1 forged pistons for an 85mm bore and a 21mm wrist pin. I'll verify that in the morning when I get back into my office.

 

[90CherryTSI]

That's what I have. They're 8.3:1 and mount directly on the rods no problems. If you can't find them, call Wiseco. They shipped them directly to me.

 

[99gst_racer]

Yeah, I just checked. JE only offers them in +.020 and +.040. But as stated above, Wiseco offers them. It is a part number K559M85.

 

[bowerboy_1]

That's what I have. They're 8.3:1 and mount directly on the rods no problems. If you can't find them, call Wiseco. They shipped them directly to me.

did you drop the pistons in or did you get the block clearanced?