ATK 365 LS2 vs Shafiroff 415 LS3
#1
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Pretty sure I roached a lifter bore so I’m looking at compete short blocks. I really want to stay standard stroke(in fact I would like to destroke if anything) so that’s why I’m looking at the ATK. But the Shafiroff just offers so much more for not that much more money; better block, better crank, better pistons - is ATK just that much better of an engine builder?
I’ve read lots of reviews that Shafiroff is a great SBC and BBC builder and is kinda new to the LS game - but I really can’t see that as any kind of actual argument. Thoughts?
I’ve read lots of reviews that Shafiroff is a great SBC and BBC builder and is kinda new to the LS game - but I really can’t see that as any kind of actual argument. Thoughts?
#2
TECH Senior Member
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I took a quick look at the ATK 365 LS2 & Shafiroff 415 LS3 and they appear to be about $1,500 difference in price.
Given that roughly the same amount of machine work and labor is required to build either engine, the difference in cost would mainly be in the rotating assembly ie stroker crank, new rod & stroker pistons.
I think you'll be getting what you pay for with either engine.
$1,500 for 50 additional cubes and an extra 50 to 75 hp & torque depending on the other parts in the combo seems reasonable, so if staying NA I'd get the 415 Shafiroff assuming everything thing else checks out.
Given that roughly the same amount of machine work and labor is required to build either engine, the difference in cost would mainly be in the rotating assembly ie stroker crank, new rod & stroker pistons.
I think you'll be getting what you pay for with either engine.
$1,500 for 50 additional cubes and an extra 50 to 75 hp & torque depending on the other parts in the combo seems reasonable, so if staying NA I'd get the 415 Shafiroff assuming everything thing else checks out.
#4
On The Tree
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Really depends what your budget is what your are using the engine for. Racing or just hot rodding it.
#5
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Pretty sure I roached a lifter bore so I’m looking at compete short blocks. I really want to stay standard stroke(in fact I would like to destroke if anything) so that’s why I’m looking at the ATK. But the Shafiroff just offers so much more for not that much more money; better block, better crank, better pistons - is ATK just that much better of an engine builder?
I’ve read lots of reviews that Shafiroff is a great SBC and BBC builder and is kinda new to the LS game - but I really can’t see that as any kind of actual argument. Thoughts?
I’ve read lots of reviews that Shafiroff is a great SBC and BBC builder and is kinda new to the LS game - but I really can’t see that as any kind of actual argument. Thoughts?
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Sacrilege (08-25-2020)
#7
TECH Fanatic
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I have built both and I prefer the LS2 blocks. The liners are thicker and they do not have near the amount of core shift. I won't build an LS3 block, at least not for me personally. Almost everyone I have seen has the liners visibly off center. You guys just wait, Dart blocks and resleeved Oem blocks are going to be the future. The attrition rate is incredible with these.
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low2001gmc (08-26-2020)
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#8
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I have built both and I prefer the LS2 blocks. The liners are thicker and they do not have near the amount of core shift. I won't build an LS3 block, at least not for me personally. Almost everyone I have seen has the liners visibly off center. You guys just wait, Dart blocks and resleeved Oem blocks are going to be the future. The attrition rate is incredible with these.
People choose the LS3 over the LS2 most of the time because of the larger bore size 4.000" vs 4.065".