#1  
Old 01-05-2022, 07:01 PM
Formulabruce's Avatar
Formulabruce Formulabruce is offline
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Join Date: Nov 2004
Location: North East of AMES PERFORMANCE, in the "SHIRE"
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KB pistons you can BUY with 6-15CC dish.They are CAST, WITH Silicon. They put WAY less wear on your block.
and they LAST. They typically weigh less than Forged as well, which is good.
>>Although not as strong as forged pistons, hypereutectic pistons offer increased strength that raises piston reliability at a lower cost. Hypereutectic pistons also don't experience as much thermal expansion as forged units, which means they can be mated to their respective cylinder bores with tighter tolerances.They have more Silicon than Stock cast piston
which decreases cylinder wear.
DONT , DO NOT, have the engine built ( Again) and have it sit for years ( body shops are booked way up right now)
A replacement piston with 4 valve reliefs (6-7 cc) , or a small dish)and thicker than stock head gasket will be fine on pump gas

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Old 01-08-2022, 04:49 AM
Ramairnacho Ramairnacho is offline
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Join Date: Aug 2021
Location: Antioch Ca
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Default Yz 400

Quote:
Originally Posted by Formulabruce View Post
KB pistons you can BUY with 6-15CC dish.They are CAST, WITH Silicon. They put WAY less wear on your block.
and they LAST. They typically weigh less than Forged as well, which is good.
>>Although not as strong as forged pistons, hypereutectic pistons offer increased strength that raises piston reliability at a lower cost. Hypereutectic pistons also don't experience as much thermal expansion as forged units, which means they can be mated to their respective cylinder bores with tighter tolerances.They have more Silicon than Stock cast piston
which decreases cylinder wear.
DONT , DO NOT, have the engine built ( Again) and have it sit for years ( body shops are booked way up right now)
A replacement piston with 4 valve reliefs (6-7 cc) , or a small dish)and thicker than stock head gasket will be fine on pump gas
I thank all the input on this. Im.a few months out at least. I want to have all parts ready to go when I pull engine and inspect in my garage. I will be taking pics and asking more advice and do realize it may be a can of wor.ms, not sure how or if any monster damaged the inside of block. I'll probably remove intake and heads while it's on the stand. I just let my project sit too long.

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