383 stroke?

[fast83z28]

Engines apart for new rings....while its apart i want to see if its a 350 or a 383.....i was wondering whats the stroke on a 383?
thx

[Drakar]

3.75"

[89vert]

Engines apart for new rings....while its apart i want to see if its a 350 or a 383.....i was wondering whats the stroke on a 383?
thx

Is it a stock motor?

[79 Z28]

3.75"
rightee o

[fast83z28]

No the motor isnt stock. And it is a 350 not 383 :( the heads r small chambered 1.94's ::)ported, polished and planed.the block has been zero decked. Comp cams 180h and roller rockers, edelbrocker performer rpm intake manifold, edelbrock 600 carb, accel super coil and 8.8 mm plug wires.......turns out the pistons r stock not high compression ::)but since one is broken in the ring groove it will be cheaper and easier to fix ;D.....needs new cam bearings, and just rings...probally going to put new bearings throughout the whole motor.

[BRADA]

a 383 usually uses 400 crank with 5.7 rods (some times a 5.565 rod with different pistons to reduce piston speed)... also most strokes will need 2.02 valves because the induction and exhaust velocity is about 20% greater. I've never seen a stroker (with high power numbers) that didn't have big valve head. Remember... take away the fuel and spark and a motor is just a big air pump...the smoother and less restrictive the intake and exhaust, the more efficient the pump :) :)

[79 Z28]

a 383 usually uses 400 crank with 5.7 rods (some times a 5.565 rod with different pistons to reduce piston speed)... also most strokes will need 2.02 valves because the induction and exhaust velocity is about 20% greater. I've never seen a stroker (with high power numbers) that didn't have big valve head. Remember... take away the fuel and spark and a motor is just a big air pump...the smoother and less restrictive the intake and exhaust, the more efficient the pump :) :)
yup, true true. but dont forget the 6" rod 3.75" stroke 383's, thats where its at ;D

[BRADA]

You're right, that's true..I built a 383 using a 400 crank for a 86 camaro, and a 383 using a 3.75 crank and 6" rods and the latter faster had rev climb than the prior. Interesting thing that both motors built roughly the same power.

[79 Z28]

You're right, that's true..I built a 383 using a 400 crank for a 86 camaro, and a 383 using a 3.75 crank and 6" rods and the latter faster had rev climb than the prior. Interesting thing that both motors built roughly the same power.
ya its not so much the power you gain but the balance and control the engine has, its easier on the rotating assembly and causes less side loading when a longer rod is used. not to mention compression stability at TDC cuz the piston velocity is slower. etc etc its all the little things that add up to count :)

[BRADA]

Good stuff ...I just aquired an 87 Z28 5spd TPI .., I want to build a motor for it ...Should I stay in the 350 range or go to a 383 (will the tranny be able to take it)??? From what I understand the T5 is not all that strong.

[Mr. TroPiCal]

you guys both stroke it :P

[79 Z28]

Good stuff ...I just aquired an 87 Z28 5spd TPI .., I want to build a motor for it ...Should I stay in the 350 range or go to a 383 (will the tranny be able to take it)??? From what I understand the T5 is not all that strong.
ya t5 is questionable, definately need to keep street tires and keep off the power shifting.

personally im a 350 nut. great balanced motor, 28 cid isnt that much, especially when its only gained on the stroke. a 350 with a 6" rod on a 3.48" stroke has an awesome rod/stroke ratio. uber balanced, less power loss through rotating masses and centrifugal forces. less block machining, its way easier on the rotating assembly as far as stress goes.

basically if you want alot of low end torque for the street, and have a strong bottom end your building, 383 is fine, with a bit of extra cost. keep in mind your gonna have to have a good breathing top end. balance/cost/powerband/hardware are the main things to consider, for cost and reliability id go 355 and just set your combo up for that, it will go just as fast, cuz it will make the same hp and maybe 20 lbft less whoopeee ;D

[IROC-Z]

buy my LS1 6spd :)