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Old 04-17-2010, 03:38 PM   #1
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Default LT1 350 vs 383

I own a 1993 z28 that is running verry nice, I also bought a complete LT1 same year from a z28 that was involved in a accident, I bought the motor so I could build a 383 for the street, Here is the question Does it make that much difference in street power building a 383 vs 350? I do know that a 383 does come at a higher price, What is your eperience with this type of build?
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Old 04-17-2010, 04:45 PM   #2
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Instead of spending all that money on a 383 rotating assembly I would spend the money on a good set of heads and cam. You can build a strong 355 that can spin pretty high and make a good bit of power.
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Old 04-18-2010, 01:52 AM   #3
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after building a 383 if i had to do it again I'd go 355 its just easier and less headaches and you can get very close to the same power out of it
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Old 04-18-2010, 01:21 PM   #4
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Default 383 Better

I feel that if you have an automatic, you can do wonders with the 383. The manual car might be better suited for a high revving 350. . . but I would still choose 383 over 350 any day of the week.

My 383 feels much more powerful than my former 350. Winding things at a higher RPM could spell trouble for your entire drivetrain and bottom end, including the pump in your automatic transmission, torque converter, your ignition system (Opti sucks after 6500rpm), and other items spinning on your car.

The fastest Lt1s tend to be a 383, or 396 with over 500hp and torque at the crank. To get that kinda of power from a 350 requires a barely streetable cam and other goodies. Look at the AI website. . . the world's fastest NA LT1.....is a 383.

For the 383, I think the increased power comes from not only the longer stroke, but the fact that a 383 breathes deeper. Therefore a 383 with a healthy cam and heads, will walk all over a high revving 350. I've seen it time and time again. I think a compromise woudl be an LT1 377. I've seen a guy get 525 RWHP and 480 torque pds from one with a smallish cam!

If you go 383, use the right components and you"ll NEVER go with a 350 when you have the opportunity.

Anyone else wanna chime in..
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Old 04-18-2010, 03:18 PM   #5
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Thanks guys it seems like you guys have had your chance to try both buildups and this is the kind of discussion I wanted to hear.

SPANKER, CAMAROZ28383,
Did you have your blocks machined for a 4 bolt main or kept it a two bolt? What rod lentgh did you go with?
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Old 04-18-2010, 11:16 PM   #6
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My vette block came with four bolt mains from the factory...:-). There are an awful lot of 383s out there running two bolt mains with no problem . . . as long as there are no power adders.

I went with 6 inch rods made by Compstar. ARP 2000 bolts made for the rod. I also went with a Compstar crank.....but crank was damaged after a bad experience with my machinst. Now I have a Scat 9000.

One added feature of these rods is they clear the block easier in a stroker because of their slim but strong design.

I went with the SRP Forged Pistons part no.: 138103. They have a 16cc dish allowing a 11 to 1 compression with a 54cc head.

I was told that the 6 inch rods allow for more dwell time at TDC and this actually adds a little power at the upper rpm range (6200+). I will redline this engine at 6400 because I now have a scat 9000.....
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Future mods. New lightweight crank with full balance. Higher stall and custom cam. Ported TrickFlows, 30lb injectors
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Old 04-18-2010, 11:28 PM   #7
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IMO a 383 is better if you have the cash for all the supporting mods like good flowing heads ect.It also depends on what your looking for and your budget,383's are known for torque.The old saying goes "theres no replacement for displacement".
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Old 04-19-2010, 12:15 AM   #8
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I kept my block 2 bolt I've seen many two bolt motor with tons of power so I figured I'd be fine, I added a arp stud kit to be safe. I went with a 6" H beam rod
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93Z basically a car in a box...well three boxes ... one box down
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Old 04-19-2010, 09:53 AM   #9
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All other things being equal......the 383 will make slightly more HP but a lot more torque; especially below 3K RPMs. This is a big reason why auto tranny cars 'like' the stroker motors so much.

Go with the 6" rod if your budget permits.

Also, 2-bolt mains are fine for the 383.

Good luck whichever direction you go with.

KW
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Old 04-19-2010, 09:12 PM   #10
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Thanks for the latest information this will help me make a better choice in my buildup
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