Yep, pretty normal, generally speaking. Performance engines tend to have more blow by so they survive at high power. Just the nature of the game until someone comes out with something better than rings to seal the pistons.

 

Are we talking a pretty much stock bottom end or something built for boost? Just curious...

 

its a forged 408 built for high boost. well i think its a good idea to do a leak down test anyway to be sure and hopefully for just peace of mind.

 

Leakdown tests are good, but they are more useful if you do them over time, especially when the engine is brand new so you get a baseline for your engine using your tools.

 

you say built for hight boost, do you have 1/2" head studs? do you have I beam rods? and what are the ring gaps?


one definition for high boost may not be same as another persons

 

good point.
so unless the motor is built with 1/2" studs and i-beam rods its not a high boost motor ? thats about as ignorant as it comes ... i placed an order with my engine builder and told him exactly what the motor was intended for . i told him i was planning on 25 psi at over 1000hp was my goal so he recommended certain things like upgraded rings, ARP everything and a couple other things. he was quite confident the motor would be fine up to 1300+ hp so i would consider that to be a high boost motor. is it an extreme all out build made for a drag truck thats making 2000hp , nope. but i would say at 25psi its made for high boost.

 

ignorant is not knowing what happens with cylinder pressures of a 4" stroke



if that motor did make a TRUE 1300 rwhp without pushing a drop of coolant or busting the rods id buy it off you


ask blown06 how his motor handled that amount of boost? he has spent a assload just to make his 4 bolt motor keep from pushing coolant

stock stroke is a whole different animal for cylinder pressure

 

ignorance and not knowing because of lack of experience are two different things. ignorance is saying that unless you have 1/2" studs and I-beams you dont have a motor built for high boost . ill go turn down my boost then since it cant be done according to you since my motor is built for LOW boost because i settled for standard ARP studs and forged H beam rods.

 

not reason to turn this into a pissing match, your motor wasnt built for big power...Also dont have the parts to support that kind of power either

big power isnt cheap, 1000rwhp isnt big power in 2015 when stock motors handle that

what limitations of parts comes into play....a proper 408 with a turbo or turbos capable of 25 psi will make north of that 1000 mark. That is when you find the limitations for 4 bolt stuff with standard head studs or block prep

even at that power level with a 6bolt setup if the tuner isnt aware of things motors will fail


all this comes from experience and you just took it the wrong way

 

I figured you more of a Richard than a George...