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Thread: .30 Bore Question??

  1. #1
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    .30 Bore Question??

    i have a 81' 350 4 bolt main that i plan on taking and getting bored. I have hoping to get one bored under .30 but i dont think i can on this engine. I heard that boring an engine 30 or over cause problems like overheating and others. i figured those who had an a engine bored 30 over could gve their info. I have a corvette rad. and a electric fan.
    thanks
    Scot
    87' S10 Blazer 2wd 2d, 3/4 drop 18' Lexani Synegy's Shaved Roofrack Shaved Spare Tire Rack Shaved Emblems m3 Mirrors w/ LED Turn Signals FBI Smootie Rollpan w/ droptag, Smoothie Tailgate, 5% Tint SideWinder Alarm Alpine Deck Kenwood Amp Kicker 4x6's 2 15' Treo's. Under Construction Garage: 78' 350 4 bolt main Comletely Balanced, 9.5:1 Comp. hyperutectic rods, 480 288 Cam, Performer RPM Intake, Holley 675, 700r tranny w/ Brute shell, Z-Pac 3-4 clutch w/ B&M Megashifter

  2. #2
    Registered User Catching Second's Avatar
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    Boring the cylinders out puts makes the cylinder walls thinner which reduces the ammount of space for heat to disipate (sp) and also puts the combustion process just a little bit closer to the water jackets. Boring to .030 over, I don't think you will tell much of any difference between .030 and standard bore. Now if you go .060 over I think you may see some difference.

    That's how I've understood it at least.
    "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

  3. #3
    BLF #1 BITCHES! slow 89's Avatar
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    your fine.. dont worry about it.. you mainly have to worry about it on 400 blocks because they have siameese (sp) cylinders and the have cooling issues.. you can bore a 350 .60 over with NO problems.. i have one rite now and i have absolutely no issues so your more then fine with 30 over..


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  4. #4
    LQ4 m8w6r77's Avatar
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    my 350 is bored 60 over and it heats up alittle. about to 210 but i think that need a new radiator. which today it really didn't heat up at all. it got to about 165. thats b/c it is winter now.

  5. #5
    Slow Ride
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    it's actually .030" over. that's only .015" per side.

  6. #6
    Registered User oldcarguy85's Avatar
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    ya you definetely won;t have any problems. .030 over is nothing. only problem like slow 89 said is when u hvae a 400 with siamesed cylinders and u bore it to .060 over. but even then its not too big of an issue
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  7. #7
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    hell yeah, thanks.all i have to do now is get my ass over to the engine shop.
    87' S10 Blazer 2wd 2d, 3/4 drop 18' Lexani Synegy's Shaved Roofrack Shaved Spare Tire Rack Shaved Emblems m3 Mirrors w/ LED Turn Signals FBI Smootie Rollpan w/ droptag, Smoothie Tailgate, 5% Tint SideWinder Alarm Alpine Deck Kenwood Amp Kicker 4x6's 2 15' Treo's. Under Construction Garage: 78' 350 4 bolt main Comletely Balanced, 9.5:1 Comp. hyperutectic rods, 480 288 Cam, Performer RPM Intake, Holley 675, 700r tranny w/ Brute shell, Z-Pac 3-4 clutch w/ B&M Megashifter

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