Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here.

          
 
 
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Old 04-10-2023, 02:30 PM
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ID67goat ID67goat is offline
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Join Date: Nov 2007
Posts: 417
Default At what point to go aftermarket block?

I want to start working on a turbo build and am wondering if I should move forward with my stock block build or start looking for an aftermarket block.

I currently have the following parts that I have been collecting over the years ready to go to the machine shop: 69 400 block, ProGram splayed caps, 4" stroke RPM forged crank, Eagle 6.625 H-beam rods, lifter bore brace, and off the shelf dished Icon forged Pistons.

Was planning to just run this with some 6X heads for around 8:1 CR with an S475 or similar turbo to have a fun street/strip (67 GTO)...maybe max 700-750hp.

I just keep wondering....is it worth it to go through all the expense, etc. of installing the splayed caps, lifter bore brace etc? Or should I just sell all these parts and start over with an aftermarket block?

 


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