However, here are some general places you can look:
* GM Dealerships: Check with your local GM dealership. They may have the bolts in stock or can order them for you.
* Online Retailers: Websites like Amazon, eBay, and RockAuto often sell automotive parts, including crate seal bolts.
* Specialty Automotive Stores: Stores like AutoZone, Advance Auto Parts, and O'Reilly Auto Parts may carry these bolts.
* Performance Parts Suppliers: Companies specializing in performance parts for GM vehicles may have the bolts you need.
* Local Machine Shops: A local machine shop might be able to help you find the right bolts.
Important Notes:
* Specify the Exact Bolt: Be sure to provide the specific bolt size, length, and thread pitch when you are searching. You can often find this information on the original bolts or in a parts catalog.
* Verify Compatibility: Double-check that the bolts you purchase are compatible with your specific GM 604 crate engine.
* Consider Quality: Choose high-quality bolts from a reputable source to ensure they meet the requirements for proper sealing.
Remember, I am an AI and cannot provide specific purchasing advice. Always consult with a trusted mechanic or automotive professional for the best guidance.