ddj19852003

what motor is easier to build 355 lt1 or 383 stroker and which is cheaper to build. and also what parts are needed to build either motor. please respond i want more power.

Got-LT1

355 is going to be cheaper. You don't need a new crankshaft. To build a 355 just bore out your current block. A 383 needs a new crank and maybe rods (not much a a stroker expert.... yet ) I would say the 355 is easier to build. Bsides I have been told of several 355s "running circles around 383s and 396s" to quote a friend.

jonaddis84

383 will require a 3.75" stroke crankshaft compared to the 3.5" stock crank. It will also require either 5.7 or 6" rods, 90% of the displacement increase is in the stroke, not the bore. You will also need to bore it .030 over and obviously get matching pistons. You will need to get the block clearanced if you go with 6" rods and then all the other machining and assembly costs. As for 355s running circles around 383s, the only time that wil happen is if the 383 is NA and the 355 is blown or juiced, its simple, more displacement always equals more power NA, no matter what, as long as you build it right and support it with other mods.

ddj19852003

jonaddis84 said mods to go with it. im curious mods like what? right now i got a cold air kit, throttle body,hypertech, flowmasters and nitto 555 drag radials. but i want more power what do i get ? and also no one answered how much it cost to make a 355.

Got-LT1

"My buddy has a '96 Z with a 355, GTP stage 2 heads, and GTP-6 cam. He's went 11.4 without any power adder! It still has the stock crank and 2 bolt main block,"

From someone I know, trust me he knows what he is talking about.

In THEROY a 383 will make more power than a 355, but theroy is not the real world is it? Look up some 1/4 times on 383s and 355s, they are often very close (definatly not enough of a difference to justify the cost). I was once a hardcore stroker guy, but I have seen the light. (Thanks Frank)

96z

A 355 would cost as much as .030 over pistons, rings and boreing would. And then balancing, assembly, etc.

BlueCamaroZ28

Most of the power comes from the top part of the engine. Head work, cam, throttle body and headers makes most of the power for a 355. Adding a 383 to that, will increase the torque and also HP, but mostly torque.

My 355, see my mods list in my sign, makes 400FWHP.

Considering 15% drive losses, that's 340HP at the wheels.

94formulabz

wow, how much did you spend on that?

revtime

the 355 I built in Desktop Dyno made 500 horse and 509 torque I think.
Not real world Horsepower but if the engine even comes close to making that kind of power I don,t see any reason to spend the extra money on a stroker.

BlueCamaroZ28

Nice page you have. Surprised that you reached those Hp numbers without head porting and valve job.

Cost of parts only was around $5000.

Edit: Did not count the price of headers, exhaust system, PCM programming, Accel ignition, driveshaft, torque arm, rear gear and coolers. So, must be close to $6000 or slightly higher but took time to build the list.

383Z4ME

The stroker motor has awesome torque. It is a great motor for the street. Cost of the crankshaft and new rods is not the only extra cost. Clearancing, new oil pan system, rear end gears. Nearly everyone told me do a heads and cam and not a stroker. I built up the bottom to add nitrous next year but if I had to do it again I probably would not go that route.

Ai

Lookin for power in all the wrong places .

If you're trying to make power, the bottom end isnt where it's at until you get more extreme or are limited by rules on induction/valvetrain options .

jonaddis84

I realize that the top end is where the power is at. But his original question was whether a 355 or 383 would make more power, he didnt ask whether a 355 with awesome heads and a cam would make more than a stock topend 383. to ask this question you have to assume you mean have 280+cfm flowing heads, matching cam, headers, exhaust, and all that other stuff on both motors. and in that case i dont see any way a 355 would make more power than the 383 assuming you had tuning for both and they were done right. if you want to know what is more cost effective to make more powerful, than just stick with a 350 and get sweet heads, a mild/extreme cam, longtubes, and a bunch of suspension and the 355 will kill the 383 since for the same cost you wouldnt be able to do anything else to the 383. get what im saying?

357LT1

I agree! The power is on the top end! I see you have a 357LT1 too, what are you #'s on the dyno and at the track if you don't mind?

Ramiro

Z28SORR

Got-LT1

You seem confused. You were once a hardcore stroker guy but you're not an expert. But you know, because Frank told you, that you can make more power with a 355. In theory (not theroy), Frank's a genesis but theory is not real world is it?

"It is far wiser to remain silent and have others think you a fool, then to speak and remove all doubt"