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Old 01-24-2008, 08:30 AM
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489 stroker

Hey i'm building a 72 chevelle 454 which i'm making into a 489 my question is if i should let the machine shop do this or try it myself.Has anyone done there own clearancing on the block due to stroking it.Like how much if any material to remove.thanks

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Old 01-24-2008, 08:58 AM
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Quote:
Originally Posted by flash96
Hey i'm building a 72 chevelle 454 which i'm making into a 489 my question is if i should let the machine shop do this or try it myself.Has anyone done there own clearancing on the block due to stroking it.Like how much if any material to remove.thanks
I don't think therer is much, if any, clearancing to be done. The last one I was involved in required no clearancing with Eagle H-Beam rods.

tom
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Old 01-24-2008, 09:14 AM
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Yeah, for some reason on a 454 there is a little more clearance inside the block so you shouldn't have to due much clearancing, however I did this with a 1970 427 tall deck and I had to hog the heck out of it with Eagle H Beam rods, I will include some photos so that you see what I mean, I had to clearance the inside of the oil pan rails as well as the bottom of the cylinders, I had never done it before but it was pretty easy and the only thing I would recommend is tape off all the oil gallery holes and crank oiling holes before you do any clearancing, even after the machine shop hot tanked and went through everything there were still enough microscopic metal shavings to wreck my bearings.

And as long as you are grinding on the block you might as well smooth out the lifter valley and take off all the casting flash on the inside of the motor to help the oil return to the pan faster.

Also if you purchase new rods you should get some with ARP's short cap bolts this will help reduce the interference with the side of the block.
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Old 01-24-2008, 09:35 AM
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Good info DV23.

I think this particular build is a very cost-effective and sensible way to get extra cubes from a BBC without sacrificing durability yet still obtaining very good power numbers.

tom
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Old 01-24-2008, 10:12 AM
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I Agree 100% it almost doesn't make sense to rebuild to stock CI's especially if you are upgrading the rotating assembly anyways. For pretty much the same price you can have a 489, 496, or 505 (pistons for the 505 might cost a little more at +.100 diameter)

However the price of the extra fuel and the additional sets of tires you go through might hurt the pocket book a little!!!!
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Old 01-26-2008, 07:58 AM
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489 stroker

Thanks for all the feedback.I'm using Eagle forged I beam rods don't know if there is a difference between H and I beam rods as far as material to remove?
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