NorthernC5

Longtime reader - first time poster...

Doing up a long block to replace my tired LS1. I will be using a LS3 block. Since I need to buy crank rods pistons - I figured doing a 4.00 stroke (same price - free cubes). Been told not to - stay stock 3.622 stroke with supercharger...

Was also thinking LSA heads because the are the factory supercharger heads. But now also thinking the GM LS3 ported heads #88958758. Do not want to go to AFR or TFS.. it is beyond my budget right now.

And compression.. was thinking 10:1 or should I run dished pistons and get down to 9:1?

This is just a street car.. might drag it once in awhile but need good street manners.

Looking to hear from anybody that has been down this road and has any input..

Thanks - pretty damn excited to get this project started

DEFYANT

I would definitely go with the 4" crankshaft. Have the crankshaft double keyed as well.

With the pistons, I would shoot for 10:1 compression.

For the heads, the LSA castings would be my choice. Have them ported and throw in some good springs.

LS1nut346

That's strange that you heard that. There are plenty of strokers running S/C's. A 402 is a stroked LS2.

NorthernC5

Yeah not sure why... have heard running out on top quicker and too on the bottom end. With the LS3 block it would be 416ci. Its a Vortech - so I was thinking the cubes would help bottom end while supercharger would increase top end?

Was also told it would be hard to hookup with a street car.. smaller cubes would do better?

conan

iTrader: (5)

No problems here, 4" stroke - LS1 - 383ci. If your buying a crank any ways I would go 4" for sure.

What blower are you going to run ?

The Alchemist

iTrader: (19)

I'm having built an LS3 416 as well by Thompson Motorsports (link in my sig) and plan to run a Procharger on it. For me, it's a street car, so I wanted max torque under the curve, so the 4.000" stroke does that. If I were a drag racer, I might go with the shorter stroke and try to spin the motor to 7500rpm. But I looked at my data logs, and looked at how I drove my car, and I rarely shift over 4k, so having more torque down low appealed to me.

Give Kyle a shout, and he can get you squared away.

Blown06

iTrader: (32)

Why is it that in one thread where a guy is looking for advice on crank stroke for a blower deal and everybody says go 4".....

...then in another thread where a guy is basically asking the same question and people are telling him stock stroke?

Damn turbo guys! lol




For the record, my opinion is that you'll enjoy the 4" stroke with a blower.

Bob@BruteSpeed

iTrader: (16)

I agree. Bob

NorthernC5

The stock stroke thinking was clarified to me better...

Stock stroke will allow car to hookup due to less torque down low... will make close to same hp just by revving up 500rpm or so higher...

Stroker will just blow the tires loose and then supercharger comes on making things worse..

If I was not supercharging I would be all about max cubes..

Still I like the sound of 416ci rather than 377ci.. haha I dont know - still up in the air - not sure what I am going to do yet.

It is the standard V3 head from A&A.

thompson

iTrader: (4)

NorthernC5, I have had stock stroke and stroker blower motors and sold a huge number of boosted builds with tons of customer feed back. I can tell you from experience that blower cars respond better to the long stroke. When you put the blower on you are setting your self up for a loss of low end torque to gain top end. You can combat this with stroke and compression. You need octane for the compression to be possible but just need a crankshaft for the stroke to work. If you are building from scratch on a blower motor go stroker for sure. If we can help in any way please feel free to give us a call.
The Alchemist, Your build is coming along great. I know you are excited to get it going, Thank you for the opportunity to work with you and we look forward to more blower results to add to our data.

NorthernC5

I feel that for all out power the stroker & cubes is the way to go.

But this is a street car - will be running street tires - not drag dot tires. Mostly for messing around town.. 0-60 runs, 0-100 runs. So if the 416 torque completely blows away the tires - I am done/beat when messing around with another vette, F-body etc because I do not have a 1/4 mile to run them down.

Maybe a 416 would not blow away the tires and would be able to get hooked up? I have never driven one...

Anybody out there with 410+ ci and a supercharger on street tires? Can you hook it up?

Thanks for all the replies so far - believe me - I want to do the cubes.. they are basically free at this point...

SilverSS

iTrader: (30)

You won't hook a stock stroke down low either if you cam it for low end. I put an ultra-torque truck towing cam just to increase low end in my F1A 370 and it is a tire fryer right off idle. If you want the stroke and cubes I would go for it. It will be a lot more fun. You can work on your suspension to get the power down better.

Detoxx03

iTrader: (14)

Depends on the blower. If you're staying with the small Si-trim keep the stock stroke. That blower doesn't move enough air and will run out of steam even sooner on a 416 than it would on a 346. I would upgrade to a Ti-trim me go 416, LSA heads, and compression between 10:0-10:2 range.

Blown06

iTrader: (32)

lol, but you think you won't have traction issues with a blower?

Sounds to me like you just need to build a decent N/A deal, save yourself the trouble and money and have fun.

NorthernC5

It did hook decent with nitto 55r tires and stock ls1 with the a&a kit.

I am probably over thinking the whole thing... Lol

The Alchemist

iTrader: (19)

The beauty with having more torque, is you can go with a taller tire, or a lower gear, and still have plenty of power to pull the car out of lower rpms.

Plus, you'll quickly learn how to regulate wheel spin with amount of throttle. I'd rather have too much torque, than not enough.

MertezWS6

iTrader: (8)

^^^ Agreed, just be done with it and go all out. Your gonna want more power some day after this build anyway, it always seems to happen. You can always control the throttle and keep your tires from spinning. As for heads, I have a set of ported Scoggin Dickey LS3 heads with springs and valve for $1300. I myself have a LS3 418 and plan on slapping a F1-A on.

frenchsquared

Corvette forum is telling me to not go 4" stroke because I road course.
I'm in the exact same spot as the OP.

I emailed Texas speed and I am asking them.

No one seems to know if I can road course a 4".
Strange cause I think a stock 427 is the same stroke.

Blown06

iTrader: (32)

Thats the stupidest thing I've ever heard.

Detoxx03

iTrader: (14)

If you're are reading the corvette forum stick to the forced induction section only.