I have 426 HEMI ENVY. I created this post to let you know .....that you also have it too. (been drinking Wild Turkey )
Actually the 392 does very well with boost...the problem is the higher compression 10.3 vs 10.9...using MM drop in pistons resolve that....but I have also seen many boosted 6.1s blow.....and the 6.4 is a better base for the 426 stroker due to only needing to change the stroke...the 6.1 requires bore and stroke changes.......but dont get me wrong...I really like the 6.1 having built two......oh, did I mention I currently have an Arrington 6.4 based 426 in my 2013 SRT??..I think the 6.1 can just take more of a beating based upon construction and boost stories I've heard. It's one of the reasons I got the used 2010 over a new '13. The other reason being 15k in savings that went straight to mods. The 6.4 is a killer stock engine though.
Not sure if this is what you meant in your post but the B block engine and the RB blocks (i.e. hemi and 440) are not the same. Aso, not sure the Gen 3 HEMIs of today should be classified as a "small block". Dimensions alone make them as large as many vintage big blocks. I've actually wondered myself at which point the modern engines get classified as small block or big block or if that is really a differentiation of the past. The modern modular v8s e.g. Coyotee 5.0 and trinity 5.8 are very large in physical dimensions, displacement aside.While it is indeed physically possible to bore'n'stroke (though, it's mostly stroke on these engines, right?) the small-block Hemi to 426, I always wonder if it is an "effective" way to enhance that engine. I'm all for building an engine with the most bore and stroke that is reasonable for the physical package, but maybe 426 is "too much" stroke as far as rpm and stresses? 426 is a number of historical significance, but for an engine block that is far removed from today's Hemi. A classic 426 was built on a 440 big block, correct?...a much larger and taller engine in physical size. You would never expect that a 340 block should/could be punched out to 426, right?
So while I can see pushing the modern Hemi engine block to 392, the notion of pushing it to 426 just seems like chasing a number that has no bearing on small block engines, in the first place. Though I guess if GM is daring enough to pull 427 out of a small-block with the LS7, maybe it can't be that out of line for the modern Hemi?
I also wonder if the aftermarket 5.7 Hemi wouldn't be better off being built and tuned for higher rpm, altogether (rather than sheer displacement increases with bore and stroke)? Maybe 2 possible options...a 5.7 L Hemi built for screaming rpm (7000 rpm?) or a modest bump to 6.0 L with 6600 rpm redline? The tuning of the cam would shift the torque peak to 4800-5000 rpm?...a high-winder profile for sure, but no 2 things are more acquainted with each other than rpm and pk hp, right?
You can just stroke a 6.1 to 426 but you are getting into the same issues as a 6.1 based 440...the long stroke kills engine life....most builders do a square bore with the 6.1 (4.08 X 4.08) to arrive at 426.7 cubic inches.....my 6.4 based 426 has a 4.095 bore (same as 6.4) X 4.08 stroke...this gives me 429.8 cubic inches w/o making the cylinder walls thinner......you will find that most 6.1 based 426 strokers are actually 410 to 419 cubic inches to make them durable...Ask Andy what his 6.1 stroker is in cubic inches and he will tell you 419 (he does bigger)....No need to bore at all to turn the 6.1 into a 426. All stroke. The only reason why my 6.1 build is not changing to a 426 is that the smaller displacement reacts better to higher boost that my F1-A can put out. If you dont believe me, talk to Andy at Performancewerks.
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Well that is certainly news to me. I had thought the Gen 3 Hemi was based out of a 340 sized block and the Gen 2 was a gargantuan big block by comparison. That would really surprise me if they are nearly the same in physical size.Not sure if this is what you meant in your post but the B block engine and the RB blocks (i.e. hemi and 440) are not the same. Aso, not sure the Gen 3 HEMIs of today should be classified as a "small block". Dimensions alone make them as large as many vintage big blocks. I've actually wondered myself at which point the modern engines get classified as small block or big block or if that is really a differentiation of the past. The modern modular v8s e.g. Coyotee 5.0 and trinity 5.8 are very large in physical dimensions, displacement aside.