I am rebuilding my motor and running nos, its a street daily driver, but I will be hosing it with a 125 shot. I do not want forged because they are not as ideal for street. My question is are Speed pro's hypertectics any good? Or is keith black the man? Summitt uses speed pro pistons, but I can substitute KB for a helluva lot more money?

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Bright red 87 GTA with 350 tuneport. Basic mods such as K&N filter, Flowmasters, Wells MAF, TPIS air foil, Accel 8.8mm plug wires with , Accel distributor cap and rotary buttons.Gutted cat. B&M Shift kit, 100HP shot Nitrous, soon to change over to carburator.

 

Why do you say forged is not good for the street? They should be awesome and they will handle the NOS, so you won't run into the chance of blowing up a piston.
My $.02, get forged, but if you are stuck on hypereutectic's, the KB Silvolites are awesome, as well as the Speed Pro.

Good luck!

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350 4 bolt main, Speed-O-Motive 383 stroker kit, re-sized rods ground for clearance,Hypereutectic pistons,9.8:1 compression,HPC Coated RPM intake, Speed Demon 750 cfm carb,World Products Sportsman II heads,2.02/1.60 valves, K-Motion springs, Comp Cam 1.6 roller rockers, Lunati adv.292/230@.050 with .512 lift,Crane pushrods,Proform HEI and MSD6A box,HPC coated 1 5/8 headers, 2.5" exhaust with 40 series mufflers,TH350 with B&M 3000 stall, Powertrax NoSlip Locker, 4.11 gears.

 

I have the hypereutectic summit kit and no problems at all. I haven't sprayed mine yet though.

 

I wanna know why forged isn't good on the streets...?

 

the old wives tale was that the piston to wall clearance on forged pistons would need to be so much that you would get piston slap (or is it splat ? ) on the cold starts in the morning.

Newer forgings can get by without this being a problem. But you will get some noise on anything (forged or a worn out cast piston) that has a piston to wall of about .004 or more

 

I don't know if this is true or not, but I was told that the eutechtic(I'm not gonna try the whole thing) pistons wont run well with nitrous or a blower. I have them in my car, and they work awesome, but i don't have NOS or a blower.

-=-Mike

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1989 RS.. Newly installed 350,bored out 30 over, Hypereutectic pistons, double roller cam, double roller timing chain, accel wires, blue streak cap and rotor, platinum plugs, chevy caprice 350 chip.

 

The mfrs. of that type of piston specifically recommend NOT using them with blowers or nitrous. I would suggest taking their advice.

There is nothign wrong with forged pistons on the street. I have built contless such motors with positive results. If you seriously intend to spray it, that is what I would suggest, which is also what the piston makers say.

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"So many Mustangs, so little time..."