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Click on image for the lowdown. 
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| | | Forums66 Topics128,167 Posts1,057,017 Members48,458 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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with Ads!  Again, thanks!
| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | 1958 was the first year all blocks were drilled for hydraulics.
If you have the engine code that is stamped next to the distributor, it would tell you if it is a hydraulic lifter engine.
If it had the tall lifters from the factory, which are only available in solids, the block will not be drilled.
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