ok I know in GEN IIengines they can be bored out to make a 396.....( 60 over I think)

I was wondering if and Gen I 350 block can be bored out to a 396 also

Thanks

Kat

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90 RS 305 TBI A4
Dumb ***/**** poor/orginating memeber of the infamous NE Crew
Time to see, believe this in me,This pain that i feel deep inside

 

Boring a Gen II .060 over will not give you 396c.i., it will give about 360 c.i.

The Gen II block has the same dimensions and bore spacing as a Gen I.

To get 396 c.i., you have to stroke it 3.875" with .030" over bore.

 

Thanks Glenn!!!

I'm thinking about what engine I wanna build next year for the RS..

So many people have done the 383 I just wanna do something different.

Thanks again

Kat

 

Why not a 406?

The larger bore of the 400 offers even greater power potential due the "unshrouding" of the valves.

 

Mosty casue I haven seen a 400 block arround these hills for a while now.. Then again i really haven been looking lately either..

Also too I have a 350 bare block outta a 89 GTA that I got for free from a friend of mine that I can use too.

Kat

 

Well, if you have a good 350 block (make sure you have it checked out though), then stroking will make sense.

However, I suspect the crank you will need to stroke it to 396 may be quite expensive (just for 13 more inces). Also, I am not sure if you will need a special cam with a smaller base circle for so the lobes will clear the rotating assembly.

I haven't investigated the 396 option too much, but those are things you should check out.

 

the almost square bore to stroke ratio of a 396 smallblock make it a very undesireable motor for anything except a truck. Look at the 400 cube ford made out of a 351. It absolutely sucks for hp output.

Even the LT1 based 396s don't have great output numbers. You rarely see anyover 400. I will admit that I saw a impalla ss with a 396 on a dynojet that made 380 rwhp. But it had EVERYTHING except NOS.

[This message has been edited by jcb999 (edited November 01, 2000).]

 

Steve Spohn runs a 396 SB, 10s on the motor, on the bottle it'll go really fast.
...ed

 

The 396 SBC utilizes an “off-set” ground crank. 4.030” bore and 3.875” stroke. Another method is to bore the block .060” over and use a stroker 3.80” crank. The later is undesirable because of the excessive over bore adversely affecting the cylinder wall thickness. The longer stroke will also affect the rod/stroke ratio creating undesirable cylinder wall thrust. Therefor, the offset ground crank and .030” over bore is the most common method used to build the 396.

The 396 is a torque monster that can be built to levels over 600 # torque and 500 hp. Unfortunately, they are an expensive proposition. The rotating assembly should be of forged steel, which is costly to begin with; and to have the crank off set ground, is an extra expense on top of that. These builds also like to “breath”. A good flowing set of heads and large cam is a must.

A 383 can be built to comparable power levels at a much lower cost.

If you want to do something “different”, you might want to consider a big block. They aren’t very common anymore. You can build a 454 or 468 for about the same amount that you would have in the 396 stroker. There’s nothing more impressive than seeing a big block crammed into a tight engine compartment.

Mike

 

My previous post was a might bit harsh.

I agree that they can be made to perform. Mr. Hoover is a very good example http://phil.tobin.net/Hoover/top.html

But, I think better output could be obtained with a more ideal bore to stroke ratio. If there is no reason that requires someone to start with an LT1 block, I would find a 400.

The 3.875 stroke makes an already marginal rod ratio even worse and going to a 6 inch rod will only complicate the ring configuration and placement.

I am sure 600 ft/lbs of torque is easily obtainable with a 400. And durability would probably be less of an issue because you arn't going to be spinning the whee out of the motor. I think mr. Spohn quotes a 8500 rpm redline which is pretty hard on valve springs and rings.



[This message has been edited by jcb999 (edited November 01, 2000).]

 

Thanks for the idea's guys.

As of right now i am still trying to explore all the options that I have before I go dump some $$ on a engine..

JCB ya didnt come across harsh man =)

Heres the bottom line.. I wanna build a semi streetable engine(more on the streetable side) that I can drive everyday and get like a 12.5 in the 1/4..

So this is what I was thinking at first
383, AFR 190's, 10:1 comp, ZZ9 cam, Mini Ram, Accell DFI controler, SLP 1 7/8's hedders SLP dual cat y pipe into a 3in Borla, pro built stage 3 tranny with a vigilante 3000 stall converter, 3.42 gears and a Aurburn posi

I'm hoping that combo would put me into low 13's if not 12's..

Then the other nite I was reading in GMHTP their project Thunderchicken has a MTI 396 in it that ran a 11.9 so that is what gave me the idea for the 396 using all the stuff that I listed above.


thanks again guys!!!!

Kat

 

Your combo seems fairly well thought out and should get you into the 12s. The ZZ9 cam is not terribly wild and even more tame with a 383. So you won't need that high of a stall converter if you choose the ZZ9 cam.

That combo could take a slightly larger cam with a 383 and still not require a 3,000 rpm stall converter. The LT-4 Hot Cam Kit would provide more performance than ZZ9 cam, and would should definitely get you deep into the 12s. And that would be a very streetable engine and still not really needing a 3,000 rpms stall.

Check out www.compcams.com for some alternative grinds.

 

Definiately go with a 400! I am building a 400 sbc with a stroker kit from speed-o-motive. for about$750 i got a steel forged 3.875 stoke crank, 5.7 rods , hypereutic pistons with lowered ringlands, bearings, and plasma file-fit rings. I thought that it was a heck of a deal. I haven't got it put together yet, so i don't know what it'll do though!

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1986 camaro with 92z28 gound effects, aero wing, 4 3/4 Unlimited products cowl, 3.90 auburn gear rear-end with Steve Spohn adj LCA's,Panhard bar. 406 stroked to to 429 motor in the works to replace 2.8. just my 2 cents

 

I didn't have any luck with my 400 so I bought the ZZ4 engine a ways back . I am trying to build my own 350 ( plenty of spunk for such a light car) "from scratch" so to speek . ALL 4340 forged parts , treated block (froze -thawed-froze-thawed-froze,like that). I have planned not to use a turbo , silly gass , or supercharge this time around. BECAUSE I am shooting for a 11:1 or higher compression ratio ,also my pistons are going to be flat topped "ring dome "