1-inch lifters in an A460 block ?

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1-inch lifters in an A460 block ?

Post  JBR-3 on June 23rd 2017, 10:32 pm

I know that if you can install 1-inch OD bushings, that you can physically do it.

But then, any lifters out there, at 1-inch OD, which will work with the resulting oiling situation, i.e., no bushings ?

Or, can you bore the block to 1.125-inch for bushings and 1-in OD lifters ?

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Re: 1-inch lifters in an A460 block ?

Post  Doug Rahn on June 24th 2017, 9:33 am

First, I am by no means an expert on this and I am sure others like Lem, Phillip, Randy, etc. can answer this better than me. But just from my own observation with Ford's blueprint of the factory block, the inboard side of the lifter boss would be getting pretty thin bored to 1.125" and could be prone to failing with high lift cams and high spring pressures. Did Ford beef that area up with the A460 blocks, I don't know. Now, if it's an Eliminator Premier or Ultra block based on photos I have seen, it may be entirely feasible. Like I said, I'm not expert, maybe the Pros will chime in.

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Re: 1-inch lifters in an A460 block ?

Post  JBR-3 on June 25th 2017, 12:24 pm

Thanks, Doug.
If the picture is a factory block, and it is drawn to scale, then the thin inward portion
of the lifter bore wall appears to be about 3/16-in. Boring to 1.125 would leave it at about 1/16.
The sleeve would add back 1/16.

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Re: 1-inch lifters in an A460 block ?

Post  Doug Rahn on June 25th 2017, 1:00 pm

You're in the ballpark, it's closer to .200" in thickness. Blueprint shows a radius of .640" from the centerline of the lifter bore to the outside of the casting. of coarse each block is going to be a little different due to core shift during the manufacturing process.
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