ok i got a small block 400ci 4 bolt main and i want to build a 434 stroker its a 4.0" stroke with 6" rods flat top pistons.

i have world sportmen II heads with 2.02 int and 1.60 exh and stock corvette sting ray 4bb intake

will this be a good street engine why or why not........

any feed back will help

 

That intake is a stupid idea for a motor like that. It's a total mismatch for the rest of the combo, above all for the cubic inches. It flows less than some stock 305 aluminum manifolds. Just because it "came off a Vette" doesn't somehow void the laws of physics. Get something that actually flows, such as a Performer RPM or a Dart manifold.

Other than that, it would be wonderful. Watch your compression ratio carefully.

 

Umm...have it bored, and build a 406, or a straight 400. Simply because you are going to run into $$$$ pits all over the place with a 434.

 

406 is the way to go! Tons of torque is available throughout the powerband with the right cam. I had a low budget (powerhouse parts) 406 in a second gen as a rookie and ran consistent 12.6 at the track. Pulled like a *****!

 

Heads are too small and so is the intake. Build a 406 and those heads would be adaquate.


Seth

 

whats in a 406 ci what size stroke, rods, and bore

and around how much hp and torque can it make

thanks....

 

A 406 is a standard production small block bored .030 over. It uses a 4.125 bore (4.155 bored .030 over) and a 3.75 stroke. You will want to run aftermarket rods, I would go with a 6" rod. I think stock they come with something pathetic like 5.625" rods.

As for horsepower and torque, the sky is the limit. I have a friend with a 406 with GM high port 18* heads, an enormous solid roller cam and 13.5:1 compression making 737 horsepower at 7200 rpm all motor with 1 carb. Runs 9.7 all motor in a 57 chevy. I also have a friend who has a 406 in a heavy pig of a 1/2 Ton 65 chevy with untouched trick flow heads and an average size hydraulic cam that turns high 12's on street tires.

The big difference between a 434 and a 406 would be where in the power band you make your horsepower. A larger displacement motor wont necessarily make more horsepower than a small displacement motor, but it will make it lower in the RPM range.

 

so the more cubic inch the less RPM you willl make ?

 

In similar engines yes.

Think of it this way:

A 406 with AFR 195's and camshaft with (240/244@.050, .550/.570) might make 500 horsepower at 6000 rpm.
A 434 with AFR 195's and the same camshaft would probably make around the same peak horsepower, but it would make it down at a lower rpm like 5500.

That said, the cam will seem more tame in the 434 than the 406, which means that you can run a larger camshaft in the 434 and see more power than a 406 with similar engine characteristics. But, if you took a 406 and a 434 side by side with similar cylinder heads, compression and camshaft, the only real differences would be what rpm peak horsepower is seen and peak torque.

 

ok i get it now

what is the difference in RPM range form the 406 and the 434

and is more RPM better for the street ?

 

In my opinion, the price to build a 434 over a 406 is too much for what the average street/strip enthusiast gets out of it. I say build a 406 and stay away from exotic mills like a 434 which would require custom pistons, a small base circle cam, custom length push rods as well as clearancing of the block.

 

More rpm is not necessarily better for the street, it all depends on where you want your peak power to come in. If you drive the car everyday and just want some low end grunt, or if you want the car to trap over 120 mph in the 1/4.

 

i want something for the 1/4 mile and for light to light

how would i buld a 406 for bottem end and not so much for top end

thanks

 

If you want a 406 with massive bottom end, throw a TPI unit on top of it... No traction to be had however...

 

I think that before you start blindly throwing together an engine you should go to the bookstore and get a couple books about engines, and building power, and methods to make power. Also, do some searches on here and on a search engine to learn more about engines. From the questions you are asking I don't think that you have the knowledge necessary to put together a good, strong running engine... yet. That is just my opinion though.

 

i know how to build an engine

i was just trying to determen what engine to build 406 or 434

 

I built my 406 this year and am very happy with it. Check out my thread
https://www.thirdgen.org/techbb2/sho...9&goto=newpost

 

If you want light to light stuff then I would try to push your torque curve as far up in the RPM range as possible. Low end torque = traction problems on the street, regardless of the tires you run.

 

Hey I just built a 406 for my 92 RS and put a carb on it. that motor is unbelieveable on the street or track. My motor is nice and streetable. 400+.030 over, eagle H-Beam 5.7, 10.5 comp, Dart Iron Eagle heads 2.02, RPM Airgap and a .498,.504 crower cam,750 holley jetted. It ran great, this motor is more then what I planned for. Makes power through the hole power band.

 

I thought you needed an aftermarket block completely in order to achieve 434ci?