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Author Topic:   engine bore
posted May 21, 2003 09:36 PM
started to build a extra engine and found a stock bore 350 chevy to use and sent the crank to be turned. there are no ring grooves in the cylinders and appear to be ok and they honed out very well. How important is it to bore out a block over stock??

posted May 21, 2003 11:10 PM
If the cyl. walls measure out ok you will be fine I always hate to buy a nice set of pistons standard bore because if you trash the block you may not find another one.If it measures out ok and your not buying a high dollar piston I would say go with it...Towman

posted May 22, 2003 08:21 PM
thats all i have ever ran are standard bores just re ring kit and cam and go. if you look around on ebay you can find pistons pretty cheap for um too i got hyperutectics this year with rings and bearings for 125 bucks. this year is the most i have ever spent on my motor and it's a whopping 400 bucks and i run up front every nite and it will last me all year long

posted May 23, 2003 10:19 PM
It must be nice to do that...Where we run rules state must be iron block and head...Oil pump in the pan..Good Luck now go rob a bank.....Towman

posted May 24, 2003 08:40 AM
ells if your on a budget and going to take it to somebody to have it looked at then it will cost about the same money to just have it bored 30 over and be done with it and pistons cost the same no matter the bore

posted May 25, 2003 01:26 AM
Definitely bore your block !! Mell00 hit the nail on the head with his post . I might add that if you can feel any variation in the cylinder wall at the top of the bore , then you have between .005"-.007" wear . If you try to run one like this , then you will never have a proper ring seal . You would have to gap your ring's about 1"-1.5" down the hole , where the bore is straight . Once the ring is gapped for the "on size" part of the bore , the ring end gap will multiply by 3.1415" as it comes to the top of the bore . In other word's , if you had .022" top ring end gap down the hole , your ring end gap would be .035" at the top of the hole if your block had .005" wear .

Just food for thought .


Hendren Racing Engines
Rutherfordton , NC

posted May 25, 2003 08:42 PM
my point is if you are unsure if the bores are straight then bore them it doesn't make sence to have it all messured out then have to have it bored anyway. reguardless of your budget it doesn't make sence to take something in and have to spend money twice when you can do it once and have no questions i don't know anybody that takes a stock block and messures it all out before they deside if it needs bored or not if they are unsure at all just do it.

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