which pistons?
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Senior User
Joined: Aug 2010
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From: Port Washington, Wi
which pistons?
im putting together a 351w roller block, im going to be using gt-40 heads and im curious. i have a lightning 5.8 block but im not using it because i would rather use the roller, however the lightning block has the hypereutectic pistons. shud i use these pistons in my roller block? whichever set im gunna use will be getting new rings also. thanks
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From: Kentucky
I think that answer depends on whether or not the block you are putting them in is the same bore size. Most Lightning blocks are casting number F4TE, that means it is roller-ready. The casting number is down near the starter.
If the 'L block is F4TE you can swap in the rollers components rather easily.
If the 'L block is F4TE you can swap in the rollers components rather easily.
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im putting together a 351w roller block, im going to be using gt-40 heads and im curious. i have a lightning 5.8 block but im not using it because i would rather use the roller, however the lightning block has the hypereutectic pistons. shud i use these pistons in my roller block? whichever set im gunna use will be getting new rings also. thanks
In the attached (slightly blurry) pic you can see the adapter kit I used, got it from CompCams when I got the cam.
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Senior User
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From: Port Washington, Wi
How much of an advantage is there if I use the lightning pistons? The shape is different than standard ones so I'm thinking it wud change compression ratios a little. Any ideas?
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It depends on how you use them. Hyper-t pistons are designed to be made of aluminum but won't expand as much as plain aluminum pistons. Hpyer-t pistons allow people to use two different metals (aluminum and iron) in the same block and you don't need to worry nearly as much about the different rates of expansion between the differing metals. In an iron block, this can be advantageous if you are running a high performance motor.
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The hyper pistons are very good , the HO motors went to them in around 93 , they are lighter than forged , and better than cast , so if your not using any forced induction then the hypers are great , use the roller block if you can....
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From: Port Washington, Wi
My 93 lightning block is not roller realy so ill switch pistons over to the roller block. How much power can I gain from roller rockers? The engine will also have long tubes and I haven't picked what intake I want to use yet. Anyone know a regular 351 efi compression ratio? Thank you!
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
My 93 lightning block is not roller realy so ill switch pistons over to the roller block. How much power can I gain from roller rockers? The engine will also have long tubes and I haven't picked what intake I want to use yet. Anyone know a regular 351 efi compression ratio? Thank you!
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you will. And this is where rebuilding a motor is like a boat (boat = hole in the water that you throw money into). With taller valve covers you will (most likely) need a new intake to clear the taller valve covers.
In this picture you can see the taller valve covers (and the obviously aftermarket intake).
In this picture you can see the taller valve covers (and the obviously aftermarket intake).
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