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Old 06-27-2005, 08:30 PM
Mustangsaly's Avatar
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.60 over 383 SBC Questions

i found a 350 4 bolt main block #14010207 it's been rebuilt b4 and was punched .30 that time, guy said .10 might clean it up, butt i'm guessing i will end up going .60 over. i'm thinking running one of the 383 setups below. think a 60 over will be ok ? i really wasn't planing on forged pistons it's not a daily driver but prob will be abused. i'm wondering about over heating ect. i will end up with or plan on a ending up with a couple backup blocks. for other builds or 4 when this ones done, but don't want to spend good $ on a .60 over block that will not make good sense money wise. whats your thoughts on a .60 over 383 SBC ?

Displacement: 383 cu. in.
Carburetor: Holley 750 double pumper
Heads: GM #441 castings, 76cc chambers, 2.02/1.60 in. valves, pocket ported
Intake: Edelbrock Performer
Camshaft: Comp Cams 280? Magnum hydraulic, with 280/280? of duration, 230/230? of duration @ 0.050 in. lift, and 0.480/0.480 in. lift
Rockers: 1.5:1
Headers: 1 5/8 in. street
Pistons: TRW forged
Rods: 5.565 in.
Crank: cast
Comp. Ratio: 9.3:1

MAX HP: 382 @ 5300
MAX Torque: 400 @ 4500

Displacement: 383 cu. in.
Carburetor: Holley 750 double pumper
Heads: GM #441 castings, 76cc chambers, 2.02/1.60 in. valves, pocket ported
Intake: Edelbrock Victor Jr.
Camshaft: Comp Cams 280? Magnum hydraulic, with 280/280? of duration, 230/230? of duration @ 0.050 in. lift,and 0.480/0.480 in. lift
Rockers: 1.5:1
Headers: 1 5/8 in. street
Pistons: TRW forged
Rods: 5.565 in.
Crank: cast
Comp. Ratio: 9.3:1

MAX HP: 400 @ 5700
MAX Torque: 403 @ 4500 and 5000

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Old 06-27-2005, 08:40 PM
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I`m curious, does the block need bored .060? if not then why bore it this far? it isn`t going to give it anymore noticeable power. Why bore a block to it`s max when it can go smaller and be reused?
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Old 06-27-2005, 09:18 PM
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Quote:
Originally Posted by DoubleVision
I`m curious, does the block need bored .060? if not then why bore it this far? it isn`t going to give it anymore noticeable power. Why bore a block to it`s max when it can go smaller and be reused?
no it only needs to be bored .030 to make it a 383
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Old 06-27-2005, 09:32 PM
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the block is 30 over now, was rebuilt sometime since new, but to rebuild again he said maybe .10 will clean it up, .10 on top of the .30 = .40 but im bidding as if it will need .60 over. i will bore the min i can, it's 30mi from me.
easy pick up. http://cgi.ebay.com/ebaymotors/ws/eB...tem=7983281141





Mustangsaly
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Old 06-27-2005, 09:41 PM
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every block is different. At those power levels you're really not at any risk of plowing through the walls due to high HP, but if your core is off or if there's not enough material left, .060 will ruin the block and you'll have to start from sq one. Have it sonic checked, that's the only way I'd bother with it.

(BTW, I have a .060 388 that has a combo very similar to the one u listed above save about a point more compression and dart heads.... it runs fine.)

K
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Old 06-28-2005, 09:02 AM
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I agree only go to .040 over if that will do the job. This will leave you room for one possibly one more bore in the future. If you go to .060 over you are done. You will need to have it sonic checked to go .060 over. Some blocks will take it and some won't. Mine is .060 over and has no issues.

Royce
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Old 06-28-2005, 10:15 AM
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Cylinder wall thickness!

What ever you do, have the cylinder wall thickness measured by the machine shop before you bore!!! If you have not bought the block yet ask the guy to have it done before you buy it.

My 383 is at the min wall thickness in some areas (lower cylinder area thankfully!)
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Old 06-28-2005, 10:22 AM
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It sounds like the machinist might just be trying to save you (and him) some trouble down the road. There's always the chance that taking it to .040 will not clean up the problems that exist at .030, at which point he has to charge you more (or more likely eat the cost) to bore it out to 060.

Just like others have said, have it sonic checked.

also, Checy_Guy, a 383 is achieved through stroke adjustment, not by bore adjustment

good luck

tbw
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Old 06-28-2005, 12:18 PM
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thanks everyone, i was planning on .40 if that cleans it up. butt was wondering if it needs .60 if it's do able, or worth it. and i was thinking about some longevity of the build and heating problems ect. this 1st motor will get abused i'm sure. if it has to go .60 over i don't mind, if .60 is still a
dependable, and if the price is right, also knowing after a .60 build it can't be built again. butt i guess b4 i know that answer, as to can it go .60 i will need it sonic checked huh ?.

i've never has a .60 over (that i know of 4 sure)


thanks

Mustangsaly
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