Most you can deck a block?
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I had my PI heads decked .026. I know your talking about the block. But in either case,.. it would put the valves that much closer to the pistons.
As far as the block goes,.. I would imagine alot of it depends on the piston height and which pistons you plan to use.
Hurst
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Originally Posted by Tiffiny
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I had my PI heads decked .026. I know your talking about the block. But in either case,.. it would put the valves that much closer to the pistons.
As far as the block goes,.. I would imagine alot of it depends on the piston height and which pistons you plan to use.
Hurst
As far as the block goes,.. I would imagine alot of it depends on the piston height and which pistons you plan to use.
Hurst
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The problem I have is at TDC the piston sits .120 in the hole and with flat tops I have an enemic 9.7:1 
So it looks like I'll need off set wrist pin$ Damn it. lol
-Mark
So it looks like I'll need off set wrist pin$ Damn it. lol-Mark
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You would gain maybe 10 - 15 hp NA with the compression bump,.. is that worth it? Or do you plan to spray the motor?
Hurst
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Originally Posted by Tiffiny
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-Mark
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I have not known any 4.6 pistons to sit that far in the hole, but if yours truly are, then your only real option to correct it is either a piston with a taller compression height, or a longer rod (or perhaps a crank with +.240 stroke 
. Offset wrist pins refer to a wrist bore that is off center of the piston centerline, to reduce rod angularity on the power stroke. They are not a solution to the problem you have. If you go decking a ton of material off the block, I think you will run into integrity issues, as well as cam timing issues. Unless you get adjustable cam gears, the more you take off the head and block, the more retarded your cam timing becomes. If you take off enough material, you may have timing cover fitment issues as well.
In my opinion, I would start paying attention at a total of .060 cut from both the head and block decks.
Brian
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. Offset wrist pins refer to a wrist bore that is off center of the piston centerline, to reduce rod angularity on the power stroke. They are not a solution to the problem you have. If you go decking a ton of material off the block, I think you will run into integrity issues, as well as cam timing issues. Unless you get adjustable cam gears, the more you take off the head and block, the more retarded your cam timing becomes. If you take off enough material, you may have timing cover fitment issues as well.In my opinion, I would start paying attention at a total of .060 cut from both the head and block decks.
Brian
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Last edited by EFI-Unlimited; Jan 13, 2009 at 04:32 AM.
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I have not known any 4.6 pistons to sit that far in the hole, but if yours truly are, then your only real option to correct it is either a piston with a taller compression height, or a longer rod (or perhaps a crank with +.240 stroke . Offset wrist pins refer to a wrist bore that is off center of the piston centerline, to reduce rod angularity on the power stroke. They are not a solution to the problem you have. If you go decking a ton of material off the block, I think you will run into integrity issues, as well as cam timing issues. Unless you get adjustable cam gears, the more you take off the head and block, the more retarded your cam timing becomes. If you take off enough material, you may have timing cover fitment issues as well.
In my opinion, I would start paying attention at a total of .060 cut from both the head and block decks.
Brian
EFI-Unlimited
. Offset wrist pins refer to a wrist bore that is off center of the piston centerline, to reduce rod angularity on the power stroke. They are not a solution to the problem you have. If you go decking a ton of material off the block, I think you will run into integrity issues, as well as cam timing issues. Unless you get adjustable cam gears, the more you take off the head and block, the more retarded your cam timing becomes. If you take off enough material, you may have timing cover fitment issues as well.In my opinion, I would start paying attention at a total of .060 cut from both the head and block decks.
Brian
EFI-Unlimited
I think he picked up a 5.4 motor and is putting the 4v heads on that.
Hurst
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Originally Posted by Tiffiny
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Oh, my mistake. Then they definitely are sitting low in the bore. Does no one make a flat top that will rise to the deck for the 5.4? I know you can get a 30cc dish that will. If not, maybe a custom rod or piston would be in order.
Brian
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Brian
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