Rij1

I'm wondering if anyone would know by a guess of what the horsepower would be on a bored out lt1 350 to a 383 with all stock components besides the pistons and what a 383 stroker would be with all stock components besides the rotating assembly would be.

LT11996

Whaaaa? You can't bore a 350 to a 383. And you can't achieve 383 cubic inches without boring the block .030 over WITH a 383 rotating assembly as far as I know

Shangrila

383 will add about 5-7hp to your build, the biggest change is in the torque curve, it moves it up so you have better launches at the drag strip.

bowtiedad_z28

The first one you mentioned is not a 383 but a 355.

97WS6SCharged

Heads and cam are where you make power in an engine. The difference in the bottom ends would be negligible.

Rij1

I didn't think a 350 could be bored to a 383 and have any cylinder walls left. How about the average HP of a 383 and a stroked 383?

97WS6SCharged

I doubt you're going to find anyone who has built a small block with a 4.185" bore and a 3.48" stroke crank to tell you the difference. Not saying it can't be done but most people aren't going to shell out the cash for an aftermarket block to use such a small crank.

Displacement isn't as important as what's on top of the motor (for 98% of us). The biggest, baddest engine in the world isn't going to be very impressive if the heads and cam aren't up to snuff. On the flip side if you throw a great (great does not mean huge or expensive) heads/cam setup on even a modest sized engine it will still run pretty well.

Injuneer

What HP level are you looking for? You can make 500HP at the flywheel with a stock 350 bottom end and a set of very well ported LT1 heads, a matching cam, and other upgrades like CAI, LT headers, larger injectors, larger throttle body and a good tune.

A 383 can make the same HP with a cam that will probably be a bit more street friendly than the cam required to make that HP level with a 350.

KW Baraka

As mentioned.....going from a 350ci to a bored AND stroked 383 will only net you a handful of HP if the heads and cam are stock.

Also, as mentioned, horse-power is made more-so with the heads and cam than with displacement; and more compression is a VERY important element when going with a bigger (more agressive) cam.

NOTE: more stroke and higher compression should increase torque pretty significantly .

350ci = 3.48" stroke and 4.000" bore.

383ci = 3.75" stroke and 4.030" bore.

To go with a 383ci, at the very least, you'll need 4.030" pistons and a 3.75" crank. You could keep the stock rods (I wouldn't) if your pistons are spec'ed for 5.7" rods. But I'd get pistons spec'ed for the 6" rods that I'd be using .

KW

97WS6SCharged

There are also a few companies which offer a crank with a 3.8" stroke to achieve 383 cid with a stock 4.00" bore. GM's crate 383s use them.

KW Baraka

Yes.

Requires different pistons from stock.

KW

97WS6SCharged

Anytime you change the stroke of the crank you're going to need a different piston.