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Hobbies & Interests
Gearheads
Are there any hard and fast visual clues to identify a big block from a small block at a glance?
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<blockquote data-quote="swampratt" data-source="post: 4287414" data-attributes="member: 15054"><p>^^^ yes valve covers are a dead giveaway and .0005 seconds to tell Big block chevy from Small block chevy.</p><p></p><p>Big block valve cover.</p><p>[ATTACH=full]489429[/ATTACH]</p><p></p><p>And here is a SBC cover.</p><p></p><p>[ATTACH=full]489430[/ATTACH]</p><p></p><p>Notice the Small block has minimal holes just 4.</p><p></p><p>On Oldsmobile I knew casting numbers on the blocks and heads to tell what chamber size etc etc.</p><p>Ka or J or C casting heads for example 400-425 or 455 notice they are letters and the smaller engines began with a number those small engines would be a 260-307-350 or 403.</p><p> Yes a 403.</p><p>Big bore and short stroke.</p></blockquote><p></p>
[QUOTE="swampratt, post: 4287414, member: 15054"] ^^^ yes valve covers are a dead giveaway and .0005 seconds to tell Big block chevy from Small block chevy. Big block valve cover. [ATTACH type="full" alt="1719356245112.png"]489429[/ATTACH] And here is a SBC cover. [ATTACH type="full" alt="1719356291469.png"]489430[/ATTACH] Notice the Small block has minimal holes just 4. On Oldsmobile I knew casting numbers on the blocks and heads to tell what chamber size etc etc. Ka or J or C casting heads for example 400-425 or 455 notice they are letters and the smaller engines began with a number those small engines would be a 260-307-350 or 403. Yes a 403. Big bore and short stroke. [/QUOTE]
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Are there any hard and fast visual clues to identify a big block from a small block at a glance?
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