whats the max boost that a stock 350 engine could take?
 

Whats the max boost that a stock 350 engine could take with to4e .57 twin turbo?

that depends on the 'stock' motor...

Cam, compression, heads, age, ect...

GM Goodwrench 350ci / 260hp Engine
Specifications: 4 bolt main with 2 piece rear main seal
Cast iron crankshaft
LT1/LT4 powdered metal connecting rods
Cast pistons (dished)
Hydraulic flat tappet cam, (.383''/.401'') and a 112° lobe separation
Cast iron cylinder heads with 76cc chambers
8.5:1 compression ratio
Left hand dipstick
4 quart oil pan
8'' balancer
spark plug- Accel 111-574 with 14mm, .460'' reach, 5/8'' hex, tapered seat, projected tip

That's pretty abysmal. That low CR will tolerate a fair bit of boost, except for the cast pistons and tight ring gaps.
I'd stop at about 9psi or so.

Everyone I talked to recommended against boosting that engine. That included Summit and engine shops. To do it right with that engine, you'd want to change the pistons/rings and the tiny cam too. But, by the time you change everything, you could've had a better engine built from the start.

i just wanted to find out but i have made my block already forged crank forged pistons nitrous hp cam and blow thru 750 carb, h-beam rods and the whole engine is arp bolted and the to4e twin turbo setup intercooled with 3 inch exhaust all the way back

then why do you care what a " stock " 350 will handle?

cause i want to know it does not hurt to ask does it!

perhaps it's for future reference, it doesn't hurt to learn. better to ask than to bomb an engine. beside, 9 psi isn't bad at all if you're just looking to put a little kick in a daily driver, although I'd be a bit more conservative myself for an added durability factor

No I suppose it doesn;t . I figured you had a stock setup and wanted to know thats all.