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 Safe horsepower for cast pistons?
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380 Posts

Posted - 01 Mar 2015 :  01:44:41 AM  Show Profile  Reply with Quote
So I picked up a set of cast early silvolite 455 pistons hung on factory rods. They are new and came with a set of speed pro moly rings. The rods were resized but have the factory rod bolts. I called a local shop and they said they could put in the arp bolts and resize again. I picked em up for super cheap and was thinking of using them in a more or less stock build. 71' 988 block, 4.21 stroke, .005 deck, I was thinking of 6x-8 with a more or less stock specs, 068 type cam, modded 750 quad as per ruggles book, and stock '72 intake. dual 2 1/2 exhaust. Factory logs. I was hoping to shoot for around 350-375 hp with emphasis on torque. Car is 4000#, will never be raced, 3:08 single spinner. will never rev more than 5200. I guess id also ask for a good Cam suggestion to fit this profile. Thanks for any input or suggestions. Also will only be run on 92 premium.

Bill Boyle
Horse Feathers (Charter Member)

5091 Posts

Posted - 01 Mar 2015 :  08:07:19 AM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
To my knowledge there is no definitive hp level or threshold. However, there is a hp level were the owner or builder believes, it's safer to go with forged pistons.

For the hp level you reference, cast pistons should not be worrisome. . Just my opinion though, another person may believe differently.


"Dedicated to keeping the classic Pontiac engine alive."

400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.
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Tribal Scout

13 Posts

Posted - 02 Mar 2015 :  8:33:21 PM  Show Profile  Reply with Quote
Personally, I wouldn't trust a cast piston at any power level over 350hp, period.

"Liberty not only means the individual has both the opportunity and burden of choice; it also means that he must fear the consequences of his actions. Liberty and responsibility are inseparable."
F.A. Hayek
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