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Old 07-12-2011, 10:10 AM
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Blueprinting Lifter Bores - BBC

I hear a lot of bad things about BBC lifter bores being poorly aligned.

I also hear about indexing them by bushing, oversizing, etc. This is not cheap, nor can every shop perform the service.

I am sure this is part of the reason BBC's have such a bad reputation for eating cams.

My question is: how can I measure them to find out if they are out of alignment; i.e. why machine them if I don't need to?

I have all manner of precision hand tools at my disposal, so that's not the problem...just the methodology.

The only way I can think of is to install a solid roller lifter, and measure it with a dial gauge to see if it peaks out at the advertised degrees (after making sure the cam lift is correct, of course). If the lifter bore isn't square to the cam centerline, the peak should be either before or after advertised, depending on whether the bore is pointed "over" or "under" the centerline.

However, this won't tell me if the bore is true in the other direction; i.e. parallel to the block face. If it's not, I think a roller lifter would edge load badly. I'm a bit stumped on how to measure this.

Guys, I know it's probably more cost and time effective to just cut the thing and be done with it, but this is a hobby, and I like thinking about the engine's geometry and solutions to the design issues. Any suggestions would be appreciated.

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Old 07-12-2011, 12:23 PM
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I had a 402 BB & it broke a camshaft while eating up a few lifter bores. I got all 16 bored & bronze sleeved like the NASCAR engines for $325. Can't beat it and it's like a line bore. Won't (or shouldn't) be an issue after that. Good luck with whatever u decide.

Hughj
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