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Originally Posted by 3kidsnotime
The SD catalog you quoted is not all that correct as well the only 6 block with a fuel pump boss is the over the counter replacement service block that is why the water passages are smaller and fuel pump boss added gm made a block to sevice all the engines with that one. The production gen 5 and 6 454 vortech engines in trucks from 1991 to today in the 8.1 have not had a fuel pump boss the only ones I have with them are service replacements. the aftermarket industry has made added deck surface to the heads with a small water passage to fit 4 5 6 blocks the new gen alum heads from gm performance are just Edelbrocks with gmperformace on them. Good question who is the largest purchaser of engines from GM I might post that its a good question
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The 99 burb 454 I have in the garage has the smaller coolant holes, no fuel pump boss.
The largest customer of GM engines is likely Mercury Marine.