Dart stroker (what will I break next)

[Markusca]

I had some issues with my 302. After pulling it I discovered its already 50 over. I am considering a Dart 370 stroker. This was custom built for aggressive street but the buyer lost interest. I can get it for a super good deal considering what is in it.

But... 373 ft torque are 3200 rpm and 461 at 5300 rpm.

I have a stock 3 speed currently. I was considering an NV3500. 35" tires. I believe 4:11 gears.

What am I going to break?
Too much motor?

 

[Timmy390]

All depends on how you drive it. A warmed up 351W did this to my T-loc. I now run a True-Trc

Tim

 

[73azbronco]

What was camshaft in stroker designed for? Might consider changing that if it was designed to run high RPM vs torque. The numbers you show sort of tells me it was designed for high rpm hi HP vs low end. A low end camshaft holds torque band pretty level from 1000 rpm on up to about 5000 rpm.

 

[BUCKWILD]

nv3500 wont take that power very long. Nv4500 or a zf if you are staying manual or a c6 if auto. and as stated earlyer if you never put your foot in it the 3 speed will live for a while but upgrading the the trans should be on the list as wall as the t case if up plan on off road use. the 20 dosnt like that kind of power (trust me)

 

[Apogee]

Weigh your right foot...check density against lead (Pb)...evaluate lifespan of drivetrain with inverse relationship between weight of foot versus life of parts.

 

[Broncos n' VWs]

Weigh your right foot...check density against lead (Pb)...evaluate lifespan of drivetrain with inverse relationship between weight of foot versus life of parts.

Let's not forget the Tangent delta (Tension) of the particular tires on this rig measured at 0°C and also at 60°C.

 

[5001craig]

I'd built everything after the engine to be just as strong as the engine. Transmission, transfer case, shafts and rearend. But you probably knew that.

Kinda what I did. Details are in my build thread in my sig. I haven't broke anything and kind of like to romp on it.

 

[nvrstuk]

X2 on the "Tangent Delta" factor!! lol

You'll love the torque if you check the cam spec's first...

 

[pcf_mark]

You guys are more bad ass / deeper wallets than me so I learned to use a safety valve. In old Corvettes the ring gear is 8.2" so it can't take a lot of power if you put a real tire on it. We use parts store u-joints on the driveshaft with a grease fitting. The u-joint breaks before you break something more expensive.

Can you leave you stranded!

Three speed will go first. If you only abuse it in 2WD on the street the rear and axles should be fine to 400 HP. If you go off road everything is the weakest link.

 

[DirtDonk]

And with that engine I would not even consider 4.11 gears with an overdrive transmission.
I'd be using at least 4.88's, if not 5.13's.

I would certainly take advantage of the good deal, assuming the engine is still new. But I would also seriously consider replacing the cam with something more street/heavy-weight friendly. At least advance the crap out of the existing one, but a replacement would be even better.

Have fun!

Paul

 

[DirtDonk]

Oh, and you asked what you'd break next? Pretty much anything that happens to be in-between the engine and the tires.
Things like stock 28 spline axle shafts.
9" carrier.
Driveshaft u-joints
Transfer case (as BUCKWILD was saying) at least the output shaft.
Transmission. Anything in the stock 3-speed or the NV3550. The NV3550 can actually take some abuse, as some have found. But it's not bomb-proof.

If you go with a much lower differential gear ratio (at least the 4.88 mentioned) then the axle shafts become the focal point of the power as things upstream have to struggle less getting the torque to the ground.
If using 4wd though, even though you're spreading the load out to more tires, the pinion gear in the Dana axles becomes the weak link up front. As the ratios go higher numerically, the pinion gets smaller.

Paul