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How Much HP / Boost Can a stock 420a lower end handle?

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DKSTREET1990

Probationary Member
7
4
Feb 9, 2021
Arvada, Colorado
I have a fullly built head and am now considering building the lower end of the motor. money has become tight and was wondering how much boost and hp stock pistons and rods could handle.

thanks
 
a low mileage engine will handle 8-9 psi for a little while as long as its tuned properly.
but
if your head is fully built, you might not wanna run boost on the stock bottom end. If you break a piston or rod, you could end up trashing it.
 
Thank you, I agree and I have the mega squirt 2 for tuning. Just don’t want to destroy it
 
Thank you for helping me out and I have decided to go ahead and build the Lower end before installing motor again
 
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