Technical > Matt Shaff's Engine Shop

offset grind crankshaft

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Roger:
Have you contacted these folks in Ohio? They specialize in early Olds speed parts and might be able to help you out.

https://rossracingengines.oursafeserver.com/c/11/oldsmobile-rocket-engines-early-catalog/

speedbump:
hey guys thanks for all your advice. it's been very helpful. everyone voiced there opion for both issues stroking or over boring. I will need to figure out in my mind which way to go. the cost is a part of my discion but trying to find forged alum. pistons and reconditioning my stock rods and bush them for floater there really isn't that much of a difference. i still need to find adj. rocker arms. which no one has except to custom make them. so the whole build is going to be costly either way i decide to go. If the mtr. was going into a street rod or hot rod. it would be a no brainer. but i do plan on racing this car and the chassis is already cert, to 7.50.  so i guess it back to the work shop to figure out the pros and cons of each way.  again thank you all for all your help and support. i will let you all know what i decided.  every one keep the nostalgia sport going. memories are hard to lose and we need to just keep on playing. Thanks again Mike

Van:
Mike  The easy way is to have the rocker shafts ground down and then Hard Chrome back to std. Best to use the 57=58 shafts and stands as they have the extra end stands {if my memory is working}, run the stock rockers and Smith Bros. Adjustable pushrods. I have ran the stock cam core and had it reground into a race grind = solid flat tappet. 

 Almost forgot  before grinding the crank, groove the mains so the rods oil 360

George:

--- Quote from: Van on September 23, 2016, 09:27:11 AM ---
--- Quote from: George on September 23, 2016, 08:38:29 AM ---The Olds engine with a 4.125 bore and 3.95 stroke is 422 CID. A gain of 28 CI. over the stock 3.688 stroke. Is that worth several thousand dollars? I would look at getting the engine to breath better before spending $$$$ on a stroker crankshaft. Again just my 2 cents.

--- End quote ---

  My 2 cents says, He can buy a off the shelf forged 400 SBC piston & a BBC  aftermarket rod & re bush the pin end to SBC size and off set stroke the crank. At .060 over bore & stroking I think 440 is more what can be had.  The stock rebuilder pistons are not cheap and the stock rod is no good for HP use. My local crank shop offsets cranks for me at $250 max, I had him offset a few Cast 460 Ford cranks last year. The Olds crank is Forged, and like I've already said this was the norm back when the Olds was raced. To try and have any success with the Olds using stock rods and rebuilder pistons is not going to work. This is not a SBC  The racing world already has to many of them


I'm really a Ford guy and my racing partner a Mopar man. We bought a FED with a SBC. It's a very affordable platform. Just 2 cents more.

--- End quote ---

jeff/21:
Here is some info that might be use full https://drive.google.com/file/d/0B3JGHlPHcRp1OEozVVduMm9rVWc/view?pli=1

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