OK, OK, OK, finally got the cash for the 383 build.

I have a zz4 right now and I'm looking to stroking it.

350 bored .030 equipped for OEM roller cam

Crank: Either a Eagle or Scat cast crank. Undecided which is better.

Rods: 6' Eagle SIR rods

Pistons: Forged Probe pistons with reverse dome of 12.8

Cam: Voodoo roller: http://holley.com/60122.asp

Lifters: OEM

Heads: Trick Flow 195 with 61 cc's for a compression of 10.5 and a DCR of a little over 8.2.

Intake: Edelbrock RPM

Dizzy: GMPP

Carb: Holley 750 vac secondary and a Holleu 650 DP

All opinions are welcomed!!!!

Thanks!!!

What kind of shape is the ZZ4 in? I wouldn't tear it down , only if it needed it. If you want a stroker motor I would start from scratch because it sounds like you are not going to be using any of the ZZ4's internals other than the block it self. Your combination looks great though.

Dave

Dave

That's a good idea. It is in good shape. The zz4 heads are long gone. It has the Trick Flows on it now with a bigger cam.

The motor has around 10,000 miles on it.

I guess I could sell the short block.

Go with the scat crank and it might do ya good to PM wolfplace. :D

I have the retrofit version of that cam in my 383. Awesome throttle response, at half throttle I can tell it wants to scream but I haven't gotten to romp on it yet.

You'll probably need the 750 on that cuz the 650 is getting a little smallish for your combo.

I'm in the same boat. I've got about 15 to 20k on a rebuilt zz3. I just can't decide if I want to pull the forged crank out and replace it with a cast stroker replacement. Is it worth getting more power from the 383 configuration at the cost of weakening the bottom end? I may just use nitrous and rebuild/upgrade if it pukes.

I was under in the impression that these cast cranks today are as strong as these GM forged pieces.

Sounds like something you'd hear from the seller of a cast crank. lol

moonie

Your idea has meat, BUT some of these cast cranks are really good.

Use the SCAT crank, not the eagle, and use the 750 VS carb.. you get much better gas mileage and not suffer any power loss on the street.

i'd use flat top pistons and a dp if it were mine, but if it's not going to the track very often then i can why you'd want to use a vac sec carb. at the track it will make a difference, but probably not on the street. although if you are building a motor like that then i don't see gas milage being much of a factor and you might as well get the most you can out of it.

difference between a DP and VS properly set up is marginal on a mild street motor while difference at the pump ($$$$) will be major. I have done both on same motor and witnessed the difference.

i've ran both types of carbs several times on several different engines from 350's to 454's and the difference at the pump is marginal when you have gears and a convertor, but the difference at the track is usually a tenth or two.

Flat top pistons would give me around 11 to 1 compression maybe a little more since my heads are already 63 cc's. Reverse domes would allow me to use 10 to 1 to 10.5 to 1 compression.

I don't really race, MAYBE a few trips a year.

Just like to play on the street.

Aaron is economizing on parts in his selection (although decent parts for what he wants do). At $3.50+/gallon these days, he WILL see (as well as feel his pocket lightened) a difference with his vacuum secondaries at the pump in his street car.

I have both sets of carbs. I have a 650 and 750 DP I can use at the track. I have a 3310 and 670 Street Advenger for the street. The carb deal ain't that big to me right now. I can swap them out when I want to tinker with each.

My car is driven maybe one day a wee, usually on the weekend. I may attend a few cruise-ins a week. Probably around 20 to 30 miles a week.

I usually attend shows and car events. I DON'T race at all. Maybe as stated before a couple of test and tunes.

My biggest conern is are these parts good or not good. Mainly concerned with debating if the aftermarket cast crank is as good as a factory forged piece.

What I found is that some people say "You are losing a forged crank." Here is what I see. Yes, the crank is forged in the zz4, but is the aftermarket stoker cranks just as good? Also the zz4 has hyper pistons and PM rods. Why would GM use a forged crank with PM rods and hyper pistons? Matter of fact, some zz4's have cast cranks I believe.

Just seems like a confusing debate to me. GM forged cranks vs. aftermarket stroker cranks.