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You are watching: What is a chevy 350 bored 30 over


Hey males does anyone know exactly how much HP you acquire with a chevy 350 when its boring 30 over, 60 over and also so top top with every little thing stock except for the pistons the course? Anyone have a rough guess?Thanks
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Not much if any kind of at all. Strength doesn"t come native overboring a SBC. Save in mind that effectiveness (hp every ci) drops as an engine it s okay larger. You now have actually pistons that sweet more, a bigger circumference piston and also rings create an ext friction too. Someone also posted on here that a SBC350 would overheat if boring over +.080", so perhaps there are additionally heating issues that could impact power together bores flourish too.A warm rod in the true feeling of words will be 1 HP every cubic inch. So depending on your stock engine, if that made 350HP new, possibly it would certainly make 355HP in +.030" form, or 360HP if +.060", but I wouldn"t counting on that.
Like he said simply boring an engine go not rise the effectiveness of the engine. Likewise the much less horsepower the engine made before the end bore smaller sized the power gain is. Stroking a small block is the only efficient means for an ext ci and also ultimately an ext power.

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In theory.... 355/350 = 1.0143 i beg your pardon is around 1.4% an ext power assuming no various other limiting determinants (heads, exhaust, intake, ......)So, a share 250hp 350 would certainly make 253.5 hp with a +0.030 bore. Much better than shedding 3.5 hp however not a remarkable gain. And also if the bore is excellent poorly you might lose hp. Bigger boring is better, yet the strength is in the heads. Concentration on getting far better heads first.
Hey males does everyone know just how much HP you get with a chevy 350 when its bored 30 over, 60 over and also so top top with every little thing stock except for the pistons of course? Anyone have a rough guess?Thanks
Modern boring is a technique to reclaim the cylinder wall surface to serviceable dimensions and quality. Gone space the job of having enough material (wall thickness) the you can truly add enough displacement to feel the power difference. The went once thin wall surface castings started to appear in the 1960"s and 70"s. Today the trouble is a loss of power as soon as boring. Getting beyond .030 it"s possible that the remaining material is therefore thin that the cylinder distorts under combustion pressure and also piston side loads which then allows pressure come be shed as extreme blow-by acquisition torque and power with it. These days plenty of engines room not encourage to it is in bored beyond .015 inch.You have to check, some hefty duty van or power blocks have extra thicknesses in them and will tolerate boring beyond .030. But when contemplating .060 most any modern block needs to it is in sonic experiment for wall surface thickness prior to dialing the boring bar method out.Bogie