383 stroker or supercharge

[v8m3]

hi guys looking for more power for the hsv 500+bhp looking at pros and cons for each and can any one map a xer 281 cam with big valve heads on a 383 stroker.

any info appreciated

wayne

[stevieturbo]

I'm sure Richard ( Ringram, ) Linden, or Wortec could sort out a re-map for you.

As for stroker or blower....of course both makes more sense

Get the stroker engine sorted, then if you arent happy, add a low boost blower on top of the high compression engine.

[ringram]

Did you consider a 402? Or are you going to stroke your own block?
sdpc and others will do you a 402 or 408 for around $4000US. bore is only 0.02 larger so ls1 heads work fine.
Then you can sell your old motor off to offset the cost too.

[v8m3]

i have a brand new spare engine so the stroker can be built first but but want to know if any one can map this
wayne

[monkfish1]

V8M3, You have mail!

[slinky]

383 stroker.. you know it makes sense

slinky
587racing.com

[BO55 VXR]

Plank question... Someone tell me what a "stroker" is, I've heard it a lot, but never found out what it is

[mackie1]

It's where you modify the engine (crank, rods and possibly pistons) to alter the stroke of the engine and as a result increasing the swept volume (capacity).

[slinky]

BO55 VXR said:

Plank question... Someone tell me what a "stroker" is, I've heard it a lot, but never found out what it is

To "stroke" an engine is to extend it's stroke..

We have a 350 block in the dragster running with the stroke from a 400 which gives us a "383 Stroker"..

hth,

slinky

[stevieturbo]

As others mention, its the "other" way of increasing capacity.

In this instance, instead of opting for a larger bore size, which isnt an easy option with an LS1/LS6 block, they opt for a longer stroke crank to increase capacity. This will require matching pistons too.
Although strictly speaking, the 383 will have a +0.005" hone.
382 would be using a standard bore size, which is what I did.

But usually comes as a kit, crank rods and pistons. Rods shouldnt strictly speaking be necessary, but GM used a stupid 0.944" gudgeon pin, that virtually no aftermarket company uses for their pistons.
They all revert back to the SBC 0.927 pin, which means once you are using rods that size, there are hundreds of piston variations to choose from, for sensible prices.

Edited by stevieturbo on Friday 25th August 00:22

[BO55 VXR]

I am now suitable enlighted... Thanks

[barking]

Chris, pleased you're out there to ask these questions for us

[V8 EOL]

Am I right in thinking that if an engine is upgraded to have a longer stroke you gain proportionally more torque than power and if it is upgraded with a larger bore you gain proportionally more power than torque?

[ringram]

There has been extended discussions on this topic and there are many variables. Basically they give the same power.
There are things like less friction from more stroke, but better breathing with a larger bore due to less valve shrouding etc. Somewhere around Square is good and long rods to reduce side loading. Plus less piston velocity and engine stress from less stroke etc, etc ad infinitum.
LS1 is 3.62 x 3.98 from memory. 383 Stroker takes it to 4 x 3.98, 402 is LS2 Block with 4 x 4.
I think you want the largest you can get of each within reason.
Some guys run 394(?) LS1's with a 4.1 stroke, but I think they are pushing the limits normally by their own admission.

[stevieturbo]

Stock bore size is 3.898"

[ringram]

Nicely spotted Sir, yes.