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I was wondering if the side walls of my cylinders would support something like .030 of .040 over pistons. If anyone knows about this of has done it what is the horsepower and torque gain an a mod like this one, and how much did it cost you.
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I'm hoping some other folks will chime in, but from my way of thinking, you probably cannot take the cylinder walls out too far on these 4.0L's. Regardless, there usually isn't much of a gain in hp/trq from just boring out the cylinders. Opening up the heads would better IMO...
__________________ 1985 SSP Mustang - California Highway Patrol Unit #E408395
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I agree with Bill.
The bigger bore alone won't give you much HP gains.
You'd have to put a stroker kit in it, if anything like that is available for the 4.0.
Since the power is in the head flow, it's where the attention should be spent first...
I was resarching this awhile back and read somewhere that you cant bore out much because of close cooling jackets and doing so would weaken the walls in some places.
But boring out a little, and making a stroker at the same time, would be interesting.
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Mike - 2005 V6 Automatic, 300+ RWHP; 12.79 1/4
Vortech supercharger (SOLD); 180*T-stat; PLX Wideband O2, VEI digital gauges, SOS pillar pod; JBA 9MM wires; Mac LT headers, high flow cats; 8.8 w/3.73s, LPW girdle, alum driveshaft, 3000rpm TC; Steeda UCA, panhard bar, brace; CHE lca's & reloc brackets; Steeda Sport springs, Tokico DSpecs. .. "Sally" is getting "balls" ...forged V8 swap in progress
I was resarching this awhile back and read somewhere that you cant bore out much because of close cooling jackets and doing so would weaken the walls in some places.
boring out an engine is used to get rid of cylinder wall wear - not to make power or anything like that...my 440 bored .030 makes it approx 446 cubic inches. you can make power by stroking a motor or increasing the amount of air going in and coming out of the engine....that's basically it, other than using nitrous.
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71 intense blue plymouth satellite 440
05 mineral grey ford mustang 4.0
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Boring out a v6
.. "Sally" is getting "balls" ...forged V8 swap in progress 
