383s are the new hotness in vtec motors

 

I think your biggest issue could be the stock heads on the stroker. The LT4 hot cam is a little small for the stroker, but I think the heads are more of an issue.

As far as it not pulling, this could be the current state of tune or any of number of things.

You need to run it at the track or get a dyno session to see where you stand.

For example, I'm about to do a CC503 install in my 96 Z. However, in doing my recent reference runs at the track.......I have lost 0.5 tenths in the 1/8 and am down on my trap speed by almost 4 mph. Before I do my install, I'm going to try to find where the speed went....sometimes, this is not easy.

So far I have changed the fuel filter(never been changed), spark plugs(were missing little disks(AC Delco's) and were 0.010 off on the gap), two of the passenger exhaust manifold bolts were loose(gasket was showing some blowby), the MAF sensor wires were completely coated with gunk and black(cleaned with MAF cleaner), and I'm changing over to a Random Tech y-pipe with hi-flow cats(just in case my stock cats are starting to clog).

My car now has 100,000 miles on it. So the above needed to be done.....but I also compression tested all the cylinders....lowest 190, highest 210. It's stuff like this that has to be done to try and nail down problems.

I'll get to test it in a couple of weeks. So I hope to have some good results.

So, it's stuff like the above that has to be done to find problems......but as I mentioned....I think your present combo may be giving you some issues.....

 

Asking questions about when a stroker kicks in doesnt lead me to belive he will be doing any head swaps anytime soon.

 

Maybe true, but I was new at this stuff one time too....as we all were at one time.

 

Saw that one coming a mile away when I read the subject.
The camshaft is what usually alters characteristics of any given motor and can change the way they pull at a given RPM or "kick in". Cubes nada.

 

Your stock heads are killing your powerband. LT1 heads are not the best flowing heads in the world. 383s need more air than 350s. Also why do you have a lt4 hot cam in your engine? That cam was designed FOR LT1/LT4 350 engines. That cam IMO is an old dated grind. Call up mr. LE and order a le2 or le3 package.

In your sig it says you have a dyno tune. Post up your results. Ex. dyno sheet, a/f, etc.

 

Ouch. Tough room. Obvioiusly this poor kid didn't know what he was asking for with a harmless question. Anyway...


Compared to the same heads/cam on a 350ci your 383 will produce peak hp/tq about 500 rpms lower. That means that from idle all the way up (until you max flow the heads or overrev the cam) you should have more tq (and by definition, more hp) than the 350. It won't be exactly 9% more, probably more than that before peak tq and a bit less after... but it should be close.

More displacement will eat up the cam and bring it down to reasonable rpms, which is why most people (myself included) probably consider your cam way too small for a stroker.

The other issue of course is the head volume/flow. With stock heads you're already limited... flow=hp. Your max hp will be limited by the max flow of the heads. A stroker will max that flow rate sooner than a 350 will, but you'll still end up at nearly the same max hp.

To really see hp gains you'll need more flow from your heads (get a fairly heavy port) and a more agressive cam to match. The same can be said of a 350, but the 383 will make the same combination more palatable... lower hp and tq peaks, lower redline (less parts breakage, less expensive parts, etc...), and a more tolerable idle lope and vaccume. If you want to make a fair amount of hp, strokers will typically have better street manners than the same topend on a smaller displacement.

Obviously you can run boost or juice to make big hp and keep a 350 and moderate cam/heads to preserve street manners as well... just depends on your goals.

 

Well when i had my dyno tune there was a misfire. So i bought a MSD and havent taken it back to the dyno shop. My goals are just to be pushing at around 350-370rwhp. If i take my heads to a machine shop to get them cleaned and all that bull, would i see any power gains? Also, if i just want a cam only engine, what is the best cam i can get between 300-400 dollars. OH YEAH, i ran the car last week in sacramento and it ran 12.9 on slicks. Thanks for the people who gave me POSITIVE feedback. Really appreciated!

 

More then any other mod at your point.. Your heads are one of the biggest things holding you back, along with the hotcam..

Get ahold of Brett or AI and tell them your complete setup, what you are looking for out of it, and they will spec you out a cam just for what your looking for..

 

^ Whos bret or AI? Do they have a website?

 

bret I believe is known as SStrokerAce on here, and AI = Advanced Inductions (Google it)

 

From what I've read here, the biggest cam to go with stock heads is the CC503(for a daily driver). Some people have went with the CC306, but from what I've read...the CC306 is a top end cam.

For me, I picked the CC503 for my stock heads.....hopefully I can rip off close to 12.0 with the right supporting mods.

Your situation may need a little more research since you have a 383.

 

In another thread, you are asking if it is normal for the engine to stall if you don't give it extra throttle to keep the RPM's up. You have an issue beside the bad heads/cam/stroker combo. You need to sort out why its stalling, and whether that is related to the weak performance at 20 MPH. If the engine isn't running correctly, its not going to pull like it should, no matter what heads and cam you use.

 

this thread wins.

 

i have a 383 and went with compcams "292" very similar to the 306 but a better midrange....course i also had my heads done......only cost me 480..wooohooo