C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

engine rebuild

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Old May 29, 2007 | 10:11 PM
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I plan on rebuilding my 89 l98 over winter if not sooner.. what is a good ebuild to do i plan on adding a cam but not sure if i want a 383 stroker or just a 355?? what is the pros and cons? and who is running what this s hust a street car i dont race but i like horsepower so any help would be nice..
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Old May 29, 2007 | 11:48 PM
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I'm surprised no one has chimed in yet. Biggest factor is budget. building a stroker doesn't cost much more but it does cost more. The extra torque will provide good SOTP performance gains. I wish I would have stroked my engine when I did my re-build, but I was on too tight of a budget.
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Old May 30, 2007 | 12:47 AM
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I am interested in replies also. I see too many threads titled PROBLEM WITH MY 383...

It just seems that the 383 stroked has some problems with longivity. It perhaps is the builder doing things they are not qualified or the owner not maintaining.

The last engine I built was a 350 .40 over and it lasted over 20 years, including 2 years of a teenage son. It had a mild off road cam with everything balanced. My current 85 has stock cam and pistons and the mods below. I really think that a good 355 with a 211 cam to pass smog would last longer than most 383's and put out some HP and torque.

Jump in guys and give us your experience.
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Old May 30, 2007 | 12:48 AM
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Drive a 383 and youll never go back to a 350 again.
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Old May 30, 2007 | 12:54 AM
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Originally Posted by cuisinartvette
Drive a 383 and youll never go back to a 350 again.
Kinda reminds me of that old saying. "Once you go black you can't turn back." My GF uses that on me all of the time
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Old May 30, 2007 | 05:44 PM
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Originally Posted by John A. Marker
I am interested in replies also. I see too many threads titled PROBLEM WITH MY 383...

It just seems that the 383 stroked has some problems with longivity. It perhaps is the builder doing things they are not qualified or the owner not maintaining.

The last engine I built was a 350 .40 over and it lasted over 20 years, including 2 years of a teenage son. It had a mild off road cam with everything balanced. My current 85 has stock cam and pistons and the mods below. I really think that a good 355 with a 211 cam to pass smog would last longer than most 383's and put out some HP and torque.

Jump in guys and give us your experience.
Of course there can be problems with any build and the reasons for them are seemingly endless. But a good 383 build, especially a mild street version should be every bit as reliable and long lived as an unstroked 350. The main thing is to do your homework ahead of time, make sure you pick parts compatible with your goals and needs and simply pay attention to the details when putting it together. And check everything, no matter how much faith you have in your machinist. For a mild build, you might want to stay with the stock length rods. I like the 6" rods for many reasons and have them in mine. But the 5.7 rod will allow a piston pin location that is probably more favorable to maximum oil control over the very long term. Once again it's just a matter of the ultimate goal and what priorities matter to you. Everything is a compromise in one way or another. Give a little here, get a little there. Read and learn and I'll bet that it'll soon become clear to you exactly what's best for your goals weighed against your pocketbook, vetteman.
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Old May 30, 2007 | 06:09 PM
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Originally Posted by vetteman8924
I plan on rebuilding my 89 l98 over winter if not sooner.. what is a good ebuild to do i plan on adding a cam but not sure if i want a 383 stroker or just a 355?? what is the pros and cons? and who is running what this s hust a street car i dont race but i like horsepower so any help would be nice..
The first question I would ask is , why are you rebuilding? If it is just worn and tired and you aren't going to race it, why build a stroker?
You can do a good 3 angle valve job and maybe some light head porting if you want. Your stock heads are pretty good. I would add a nice cam and full roller rockers. You will pick up some performance. It's also a good time to do headers if you want. Long tubes will work best, something like Hedman Elites.
With just the changes I mentioned you should pick up over 60 CHP. You will need a new chip if you do the cam.
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Old May 30, 2007 | 06:50 PM
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Originally Posted by BADDUCK
The first question I would ask is , why are you rebuilding? If it is just worn and tired and you aren't going to race it, why build a stroker?
Which begs the obvious question.... Why not?
Originally Posted by BADDUCK
With just the changes I mentioned you should pick up over 60 CHP. You will need a new chip if you do the cam.
Now though, any HP gains aside, let's compare the torque gains of this, compared to the same mods with a stroker bottom end. Or as I like to say, horsepower sounds impressive, but torque makes it impressive.
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Old May 30, 2007 | 06:54 PM
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Originally Posted by Corvette Kid
Which begs the obvious question.... Why not?

Now though, any HP gains aside, let's compare the torque gains of this, compared to the same mods with a stroker bottom end. Or as I like to say, horsepower sounds impressive, but torque makes it impressive.
Hey, if he wants to, go for it. Just putting foward the mild build, simple approach. Still plenty of torque and fewer headaches.
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Old May 30, 2007 | 07:05 PM
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Originally Posted by BADDUCK
Hey, if he wants to, go for it. Just putting foward the mild build, simple approach. Still plenty of torque and fewer headaches.
I understand, but with stock quality (cast) stroker kits starting in the $700 range, it really comes down to just a lot of bang for the buck. This includes crank, rods, pistons plus the rings and bearings. I found my parts, all of them forged, w/ a 3.80" 4340 crank, 6" featherweight H-beams and lightweight inverted-dome pistons for only $1700 and change. This included custom Clevite bearings for the radiused crank and Total Seal file-fit rings.
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Old May 30, 2007 | 10:17 PM
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i like the 383 idea but is there going to be alot of changes like injectors or can i run stock injectors? just some questions before i decide what im going to do
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Old May 30, 2007 | 10:29 PM
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To get the most out of it larger injectors and a custom prom would defently be in your future if you plan on staying injected. Along the same lines to get the most power out of it you'd most likely want to upgrade to something like a holley stealth ram or something along those lines.. for TONs of info on this swap check out www.thirdgen.org as many people over there have done the same thing.. just don't tellem its for a vette.
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Old May 30, 2007 | 11:05 PM
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horsepower sounds impressive, but torque makes it impressive.
Go for the stroker=big torque
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