I am building a stroker F/I 8.1L , how much is the block good for?

Thanks.

 

What big block are you starting with... Gen 1 or Gen 3? Factory or aftermarket?

 

Thanks for the fast reply,

It is Factory GEN 3 (VORTEC 8100)

 

I'd say that block is good for well over 1000hp

 

Thanks for the reply you made feel good,

has anybody done it?

 

Unlike the OEM SBC, that stock BB cylinder case is a stout piece, even with the factory 4-bolt iron caps. But as with any block, there is no HP limit per se. If you are building a huge hp blower motor (is that what you mean by F/I?) the issues are cylinder wall thickness and head gasket retention. Get any additional displacement from stroking the motor, keep the boring bar on the bench, as much as possible.

Use high quality head studs and avoid milling the heads to the extent possible. Milling will decrease the thickness of the head deck and decrease resistance to distortion. One advantage of aftermarket blocks are extra head stud bosses in the lifter valley, which provide extra clamping for the heads.

For a street/strip application, try some of the MLS gaskets. For a race application, use copper. MLS = Multi Layer Steel (Cometic, Mr. Gasket, others)

As with a SBC, block fill will stabilize the block. A partial fill is compatible with street use.

Unless you have an incredibly stout chassis and drivetrain and a huge blower, a factory 502 will probably take all you throw at it with some basic attention to proper preparation and assembly.

Rich

 

that motor is fairly new and only available in trucks and for boats and industrial use.

You might want to get in touch with these folks http://www.raylarengine.com/ or somebody that builds engines for offshore powerboats.

We've seen a few examples of the small block LT1 holding in excess of 1000hp and the big blocks are just plain bigger and stronger.

 

rskrause

The block is 30 over and the stroke is 4.5 and for now i am planning to use

Whipple supercharger w/intercooler 10 psi ,low CR pistons, supercharger

cam, aluminum cylinder heads, "CoolGap" intake manifold from Rayler and

the rest of the forged parts.

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AdioSS

Thats where i am going to get my parts.

Her in Saudi Arabia they bore the LT1 125 over and they use 400 SB

pistons along with 100 + shot of the mass distruction weapon, atleast

three or four engines has been done like this and non of them failed,

forgot to add that they port the heads,hot cam kit, and reved over 6K

RPM.

 

Did you pick up on Gen 3? I would assume with the relationship to the LS1 smallblock, that the big block version would have similar 6-bolt mains. Is that not the case?

 

damn, stroking a 8.1L. I hope that thing has some awesome heads.

 

.125 over on an LT1 block? Without a sleeve? You can't be serious.

 

Injuneer

here are some pic

http://groups.msn.com/aboadnan/mis.m...oto&PhotoID=22

it looks like the old big block

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http://groups.msn.com/aboadnan/mis.m...oto&PhotoID=18

Here it is like the LS1 but bigger

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Here with the coils

http://groups.msn.com/aboadnan/mis.m...oto&PhotoID=24

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Here is the EX side, doesn't look like the old big block

http://groups.msn.com/aboadnan/mis.m...oto&PhotoID=21

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this is the whole album

http://groups.msn.com/aboadnan/mis.msnw

======================

Lt1 and 125 over is true because there so many available and and cheap

and we have some crazy pepole to willing to try and they did, i am like you

i asked my freind more than once and saw the engine ( from outside).

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Boost It!

i am going to use these heads

http://www.raylarengine.com/head.htm

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Will try to keep you posted as i go along, i have my AWD dynojet and

hopefully if i get good HP # (god willing) i will tell you about it.

Thanks everbody

 

Which whipple are you gonna use?

 

look under superchargers and nitrous

http://www.tbyrnemotorsports.com/81truckcatalog.html

 

Thanks for the Gen 3 BB 101 lesson, but we're already familiar with that engine here.

I'd have to see it to believe it (from the "inside", not the outside). The fact that people are "crazy" doesn't allow the engine to magically have thicker cylinder walls, to allow that much overbore. There was a thread here in the past two months where someone INSISTED he could bore .125 over, we all told him it couldn't be done, and when his shop bored it, they ruined the block. I've also got sonic measurements of my LT1 block somewhere, and there is no way the block could have been taken to 4.125 and stood up to "100 + shot of the mass distruction weapon"

As far as the Whipple, Whipple sells both emissions compliant and non-compliant versions of the S/C for the 8.1L Gen 3 - both intercooled and non-intercooled versions. They have the HP and torque curves for the emissions-legal setup on their website.

http://www.whipplesuperchargers.com/products.asp

The kit on a stock 8.1 makes over 800 lb-ft of torque at 3,000rpm.