516ci bbc
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516ci bbc

  1. #1
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    Default 516ci bbc

    Hey guys i just got a short block from a guy in houston its a bored 502 it is now 4.530 with a 4 inch stroke crank and 6.135 rods i was wondering if this was a good combo do to the fact that it needs new rods and pistons now would be the time to change it up. Im not real sure how much more i can have this block bored

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    Senior Member Widetrack's Avatar
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    If you are having to change the rods and pistons I would just go to a stroke kit, crank and all! With that bore I think with a 4.25 stroke crank you would be around a 547 or so! You probley have two more bores you can go safely!


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    Thats what i was kinda thinking i dont want to bore the hell out of it like some people just in case something happens i can still fix it. he 4.25 stroke will fit in it without any grinding right.

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    Hell i dont know what im thinking i should just shit can all this and get me one of those ls badasses.

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    Senior Member MACHINEHEAD1's Avatar
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    4.56 is max bore for production block. Sonic check if its for a boat. May want to run some sort of temp control, (t-stat) to keep the bores true during opperation. And dont put a blower on it if you go 4.56. And the 4.25 stroke will drop right in with steel rods.

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    Senior Member Bubbletop409's Avatar
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    Unless that is a bowtie or aftermarket block I thought the max bore on a factory 502 was 4.5"? Anybody know for sure, cause I have a HP500EFI 502 that I would like to open up more than 4.5" when necessary.
    Larry

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    Senior Member widowmaker's Avatar
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    That's what I thought too. 502 is a 4.47 bore stock. Max recommended from what I've read is 4.500 bore. I'm in a very similar situation right now myself. 4.47 right now. Going to 4.5 bore with 4.25 stroke. I'm thinking it will be around 540 when I'm done
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    Default block

    Mine is a bowtie

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    Quote Originally Posted by matt wheeler View Post
    Mine is a bowtie
    Then let the boring begin. You'll gain more from unshrouding the valves, by moving the cylinder walls away from the valves, than you will from the extra few inches, but it's a win win. No replacement for displacement.
    Larry

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    I would need to double check, but I think GM was recommending .060" maximum over bore on the Gen 6 blocks. I know that's what they say on the Gen 6 454 blocks,, but one I looked at pretty carefully with the machinist at the shop seemed to have very thick walls.

    I did a 4.530" bore on a Gen 6 502 block with a Whipplecharger on it a couple of years ago, it's been an impressive engine, honest 120+ mph on gps in a Stoker. I have done a couple of others to 4.530" and 4.250" stroke(548 cubic inch), but neither has any time on them yet except on the dyno.

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    Default gen 6 502

    mine is 4.500 with a 4.25 stroke, and i was told it had very thick cylinders, that could have gone as far as 4.530 with no issues. just no need to go that far. 4.25 cleared no problem without any work, or pan mods.

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    Quote Originally Posted by nelson#109 View Post
    mine is 4.500 with a 4.25 stroke, and i was told it had very thick cylinders, that could have gone as far as 4.530 with no issues. just no need to go that far. 4.25 cleared no problem without any work, or pan mods.
    I fully agree that it's a good idea to only bore the minimum to clean up a block, so that you have a chance to bore the block in the future if necessary, not to mention maintaining adequate cylinder wall thickness.

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    Default Gen 5 overbore

    I was given a hurt Gen 5 block and had nothing to lose. I sonic checked it several times prior to boring. I took it out to 4.580 without any problems. The engine has run for 2 years. Went conservative on the compression - 9.5: 1, but spin it to 6,200 RPM's regularly without cyl wall failure to date. 502 block.
    Last edited by Big Papa Pumper; 12-16-2011 at 04:40 AM. Reason: more info

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    Default 502 bowtie

    I have been told by many that the bowtie is good for 4.600 but like you guys said its all about the wall thickness if you go much more i would think filling it to the bottom of the water ports with filler would help some but i think im just going to leave my bore alone and just stroke it just a little to get the ci out of it. Thanks guys

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