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Thread: 350 rebuild

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  1. #1
    357mag is offline Registered User Visit my Photo Gallery
    Join Date
    Sep 2011

    350 rebuild


    Im rebuilding the engine out of my truck, i was going to bore it 40 over, new cam, lifters, pushrods, valve springs, and machine work. im having trouble figuring out my compression ratio and deck height, compression height, and quench. I want it to be a low buck build for a 4x4 truck not a race engine. I need help choosing pistons and what size dishes and CH on them. ive crunched so many numbers i thought i was back in high school math class but still im just as confused. any help is greatly appreciated

  2. #2
    cffisher's Avatar
    cffisher is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2006
    Car Year, Make, Model: 57 chevy 2 dr wagon

    A low buck build?? What made you decide on .040 over?? if there is nothing wrong with it the way it is???Figure you'll put at least 1K into it. and probably more
    Lovin' what I do and doing what I love
    Some guys can fix broken NO ONE can fix STUPID
    Christian in training

  3. #3
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Apr 2005
    bay city

    the machine shop can work out the deck just tell them what you want for deck O? or 005 in the hole or 010??you just need the piston your using and you can work out the piston CH or look the piston up lets say if a speed pro it will be listed in speed pro piston book and many others list there ch of there pistons if you have there book or just work the Ch out be finding the piston center line of pin to top of the deck of piston thats the Ch. all makers of piston will not have the same ch .when you have this you add it to the length of your rod stock is 5.700 and then if stock 350 crank 3.480 then 1/2 of that 1.740 then the piston CH lets say is 1.550 add all up crank 1.740 .rod5.700 piston 1.550 your at 8.990 deck for O deck then if you want the piston to be in the hole add what you want 005=8.995 or 010=9.000 deck .to work out the CR of the engine you need to know the size of the cc of head chamber .head gasket fire ring and how thick the gasket is or cc.then were is the piston is in the block O deck ? or what . then the cc of the valve cuts in the piston . the bore size then stroke. then run the numbers there is many on line calculators. many pistons books will get you close .but i allways run the numbers and cc the heads and pistons so i know it what i want if not i mill heads or use a head gasket with less cc or both
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip

  4. #4
    1gary is offline Banned Visit my Photo Gallery
    Join Date
    Feb 2010
    Car Year, Make, Model: 1985 high top Astro van

    Here is one of those on line formula sites Pat spoke of.

    Wallace Racing - Automotive Calculators
    Good Bye

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