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383 block for TPI....

Old 12-02-2018, 02:45 PM
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383 block for TPI....

So I see these 383 blocks (clearanced), etc... Says 1996 to 2000 Gen 1 (non LT1 Blocks)
Can these be used for my TPI ?
I see one is 4.004, 4.030, 4.040, 4.060, etc...

https://www.summitracing.com/search?...20bare%20block

Thanks,
Rafael
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Old 12-02-2018, 02:58 PM
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Re: 383 block for TPI....

Why not? Sounds like a Vortec block. So might need different starter bolts? Might not have all the timing cover bolt holes, no mechanical fuel pump provisions, 1pc rms... Otherwise its still pretty much an oldschool chevy.
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Old 12-02-2018, 05:30 PM
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Re: 383 block for TPI....

So, Vortec block...
A "vortec" block isn't really special, unless I had Vortec heads / intake, I can use NON Vortec stuff, right?

Different starter bolts, so should be able to use the starter I have...

I can get a new proper timing belt cover for it and be ok???

It does have mechanical fuel pump provisions... I assume there is a block off plate, since I'm sticking with TPI.
Will the "provision" hurt / block anything I need?

Yes, it is a 1pc rear main seal...

Thanks,

Rafael
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Old 12-02-2018, 06:02 PM
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Re: 383 block for TPI....

Pretty much. The question is why Summit lists them as 96-2000. The only reasons I can think of are above and not at all an issue. Probably ought to call Summit to find out why they list such a narrow year range.
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Old 12-03-2018, 09:53 AM
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Re: 383 block for TPI....

You're better off with a 350 IMO. The 383's have a long stroke - they don't rev and they scuff pistons. Many people I've talked to say they don't last like the 350 does. Also the benefits are mostly low end torque, which really isn't that useful on the TPI setup that is already heavy on torque. Most people are trying to shed torque and gain HP. The 383 will gain very little in peak HP compared to a 355, etc. Less than 10 HP typically.

GD
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Old 12-03-2018, 12:18 PM
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Re: 383 block for TPI....

Thats old school

today a long 6Ē rod 383 and proper piston design will live longer than you would ever need.

power potential is there, cubes make power if you can feed them. More head more cam can be used to make more power

not so much in tpi however. Rpm is generally limited by intake length
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Old 12-03-2018, 12:50 PM
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Re: 383 block for TPI....

I'm not sure about these "cheap" stroker kits though. I'm sure you are right (as you usually are) about quality parts, but OP is talking about a summit branded block here. What kind of stroker kit do you have to buy that has proper rods and pistons for longevity?

In theory, at some point the 355 will pass up the 383 at higher RPM due to friction losses. That's why they make crazy torque at low RPM (more than is really street-able with a TPI setup), but fall off at high RPM. Piston speeds are high with that much stroke and so losses due to friction grow at a higher rate than with a shorter stroke.

GD
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Old 12-03-2018, 01:01 PM
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Re: 383 block for TPI....

I wouldnt worry about the block being summit but would rather see you find a local machine shop to do the machining, with your pistons and rods to verify best fitment and assembly.

I would talk to summit on the machining but its probably done ok and can be fine finished at a local shop, such as final hone job

i dont recommend rotating kits as much as just buying components individually. But most decent shelf 6” rods are good and shelf pistons are good stuff. I would go forged pistons. Thats just me. If all the clearances are set right and ring seal is good from good hone and break in you shouldnt experience any issues.
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Old 12-03-2018, 01:55 PM
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Re: 383 block for TPI....

When I have looked into it, it just seemed overly expensive for what you would get out of it. Other than bragging rights, you have to buy all new internals, when it's fairly easy to get 400 HP and 400 Torque out of an L31 350 with stock crank, rods, and pistons. Seems like a lot of cost for not all that much of a gain. If I had to choose between 383 or roller cam, I would go with the roller cam.

GD
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Old 12-03-2018, 02:51 PM
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Re: 383 block for TPI....

These should be roller blocks too
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Old 12-03-2018, 04:18 PM
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Re: 383 block for TPI....

My machinist was able to finish drilling block for fuel pump rod. gotta look at the block some take the plastic Vortec timing covers - others dont and accept conventional SBC timing covers
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Old 12-03-2018, 04:56 PM
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Re: 383 block for TPI....

Originally Posted by zman1969 View Post
My machinist was able to finish drilling block for fuel pump rod. gotta look at the block some take the plastic Vortec timing covers - others dont and accept conventional SBC timing covers
They are interchangeable - at least they were on mine. I swapped the plastic vortec covers for standard SBC timing and oil pan, etc. Mine is a 98 block.

GD
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Old 12-04-2018, 07:22 AM
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Re: 383 block for TPI....

Originally Posted by GeneralDisorder View Post
When I have looked into it, it just seemed overly expensive for what you would get out of it. Other than bragging rights, you have to buy all new internals, when it's fairly easy to get 400 HP and 400 Torque out of an L31 350 with stock crank, rods, and pistons. Seems like a lot of cost for not all that much of a gain. If I had to choose between 383 or roller cam, I would go with the roller cam.

GD
Can you explain whats required to get that much HP out of an L31 please? Although I am only after 350ish
I am debating an L31 or the 350 HO for replacing my 350 motor running a TPI System.
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Old 12-04-2018, 07:42 AM
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Re: 383 block for TPI....

Good dual plane intake and a 224 .550 108-109 lsa cam will get around 375-400 flywheel easy
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Old 12-04-2018, 10:52 AM
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Re: 383 block for TPI....

I just recently built a 383 with a 2000 Vortec 350 engine (GMC 3500). when you bring the engine to the machine shop they usually clearance everything you will need as far as that goes. For the rotating assembly, its got an Eagle setup (Ill look up part #'s later for you). slightly better than stock summit heads with ls6 valve springs with a comp cams 503 cam.

As for the mechanical fuel pump, GM just filled in the casting for it so its pretty much just 2 extra thread holes in the side of the block. If you wanna see some bits and clips of the engine, punch "Ratherbeboating10" into the youtube search>
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Old 12-05-2018, 05:12 PM
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Re: 383 block for TPI....

It's a GM block sold by Summit (and Jegs too)...

Well, options this route keep getting more expensive...

Off to the next topic
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Old 12-18-2018, 03:55 PM
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Re: 383 block for TPI....

I have a 305, so I'm not starting with a 350...

There has been mention of a 6" rod, I thought the stroker used a 5.7" rod and the 400 crank to make up the 383?

Rafael
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Old 12-18-2018, 04:14 PM
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Re: 383 block for TPI....

Rod length doesn't alter the stroke.
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Old 12-18-2018, 04:24 PM
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Re: 383 block for TPI....

I have a stroker kit for 305 to 334, I'm pretty sure it has the 5.7" rods... I would just need to get the right 350/383 stroker pistons to get the compression I want...
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Old 12-18-2018, 07:29 PM
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Re: 383 block for TPI....

The 1996-2000 blocks are 880 blocks. Still a 350 block. They are slightly different. Mechanical fuel pump blocked off, Maybe a 4 bolt main and the starter bolt holes might be different. You can bolt on any Small Block Chevy Gen1 Heads.

I turned my 880 block to a 388ci with 6in rods. And I rev the engine to 6500rpms because I have a Miniram.





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Old 12-18-2018, 07:42 PM
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Re: 383 block for TPI....

Nice

So benefit / drawbacks of 6" vs 5.7" Rod?

Thanks,

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Old 12-18-2018, 08:34 PM
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Re: 383 block for TPI....

Originally Posted by luvofjah View Post
Nice

So benefit / drawbacks of 6" vs 5.7" Rod?

Thanks,

Raf
6in rods less friction on the cylinder walls. It pushes the pistons more straight up the cylinder walls.
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Old 12-19-2018, 12:59 AM
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Re: 383 block for TPI....

Originally Posted by VincentZ28 View Post

6in rods less friction on the cylinder walls. It pushes the pistons more straight up the cylinder walls.
Disadvantage - it also puts the oil control rings through the wristpin bore. An additional support ring is needed to bridge the gap.
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Old 12-19-2018, 07:20 AM
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Re: 383 block for TPI....

Originally Posted by NoEmissions84TA View Post
Disadvantage - it also puts the oil control rings through the wristpin bore. An additional support ring is needed to bridge the gap.
True! But if itís done right, you wonít be burning or using oil. Iíve gone 6000 miles without using oil.
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Old 12-19-2018, 07:32 AM
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Re: 383 block for TPI....

Originally Posted by NoEmissions84TA View Post
Disadvantage - it also puts the oil control rings through the wristpin bore. An additional support ring is needed to bridge the gap.
eh some might not call that a disadvantage. It works fine that way. Additional parts and assembly for this but still works fine

my boosted motor had oil ring supports and was fine in all areas that matter imo. Blowby was normal, oil consumption was non existent. 5000 miles or so. Now over the course of 30,000 miles i cant say lol. But who puts that many miles on a performance motor
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