ATK 408 Short Block

[340inabbody]

Trying to understand options and discovered ATK’s 408 stroker short block. Looks to have decent internals Scat and such.

Anyone have any experience With these?

 

[JBurch]

Delt with ATK years ago on various projects, nice product, nice too work with.

 

[Frodee]

Running a Blue Print 408 in my car and I'm very happy with it.

 

[FlamesAreWicked]

I considered going the same route.. I think there’s two levels of short block..I think the difference is the rod choice. They’re 5.9 magnum based and I think those are balanced internally. I ended up finding a 340 though so I went that route instead. One of them was $2999 through summit… at least earlier this year it was.

 

[340inabbody]

I considered going the same route.. I think there’s two levels of short block..I think the difference is the rod choice. They’re 5.9 magnum based and I think those are balanced internally. I ended up finding a 340 though so I went that route instead. One of them was $2999 through summit… at least earlier this year it was.

Yes. I am also considering a Blueprint.

 

[Frodee]

Yes. I am also considering a Blueprint.

I'm very happy with mine bought a turn key from them back in 2019 and never a problem after 15,000 miles. Long 1,200 mile runs is no problem.

 

[crazydog]

I considered going the same route.. I think there’s two levels of short block..I think the difference is the rod choice. They’re 5.9 magnum based and I think those are balanced internally. I ended up finding a 340 though so I went that route instead. One of them was $2999 through summit… at least earlier this year it was.

Nope, according to the website the difference is the more expensive short block has a forged crankshaft and forged pistons.

Chrysler Short Block

 

[Ricks70Duster340]

Yes. I am also considering a Blueprint.

The 408 stroker from blueprint is cheaper thru summit with free shipping. Faster turnaround too.

 

[BrianT]

The 408 stroker from blueprint is cheaper thru summit with free shipping. Faster turnaround too.

AND you can use a 10% off coupon when they're available. My buddy saved a bunch that way.

 

[340inabbody]

AND you can use a 10% off coupon when they're available. My buddy saved a bunch that way.

10%?

 

[BrianT]

Summit gives away 10% off coupons at various car events. Those discount codes are often shared on forums such as FABO.

 

[340inabbody]

Summit gives away 10% off coupons at various car events. Those discount codes are often shared on forums such as FABO.

Thats like $1000 of a 10k crate motor. I wonder if they were good for crate motors from ATK or Blueprint? Ill keep an eye out as I wrench on my 340 and 318.

 

[BrianT]

Yes. Two years ago my buddy bought a BluePrint 350 Chevy engine that way. It's 10% off anything except sale items.

 

[mopowers]

You could open a Summit speed card too. They often have 10 or 15% off promotions on purchases where you use their card. It may have a cap though.

 

[63Dart170]

Yes. I am also considering a Blueprint.

Here is the dyno sheet of the 408 that was recently delivered from Blueprint:

It came with a Blueprint air filter lid. I had to change that immediately. LOL

 

[340inabbody]

What do the heads have printed on them? I assume Edlebrock but can’t quite tell? Is it a modified head? Do you know who makes the lifters/rockers?

 

[middleagecrisis]

From the dyno sheet above it looks like power starts to drop off at 5500, perfect from a reliability standpoint!

 

[4eighteener]

Here is the dyno sheet of the 408 that was recently delivered from Blueprint:
View attachment 1716494053
View attachment 1716494054

It came with a Blueprint air filter lid. I had to change that immediately. LOL

Is that gooseneck a blueprint part or something you bought aftermarket?
That would be useful to me if anyone knows who makes it

 

[cpearce]

A while back a fellow in my town bought an ATK BB Chevy. I wasn't really impressed, power was not there. My distaste rose when I saw the cheap offshore rocker arms, I looked into it no further.