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 Blocks / Cranks/ Rods and Pistons
 Safe horsepower for cast pistons?
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Merrik66
Cochise

USA
370 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)

USA
4793 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.

Bill

"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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HurryinHoosier62
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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