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Originally Posted by screamingchief
I did'nt think this thread had anything to do with 700+ hp block choices,more like those intermediate choices between what is suitable to use for a stock 250-300 HP build,what is suitable for the intermediate 350-600 HP builds and NOT those said 650-700 and up HP builds.
You know,to help keep folks that are new to (or unfamiliar with) pontiacs from sticking they're nice new stroker crank bottom ends in a weak "late" block and having it nuke itself even though it's only making 450-500 HP... 
If those here cant see the obvious weakness in the design of the #500557 block castings,then I dont know what to say,just give up engine building and leave it to those who know what to look for. 
I just felt this would be a good reference for STOCK block comparison,a databank one can tap so they can see what the differences are between various castings. |
Ditto.
Would be easy to take this to the anal level. LOL. Basically there is a really weak casted block late 75 and newer, (reminds me of the 403 Olds units, LOL). Then a decent cast blocks between 71/early 75 and then 3 good cast other blocks 67/74 to choose from for higher hp builds.
But most any of the blocks from 71 thru early 75 will handel 80% of the customers builds.
Making 350 or 360hp with the 75 and later units isn't an issue with the right parts and prep.