70o hp out of standard port Victors? No way. I am no expert with those heads but have used them. I built a 471 11.4 comp, 269 @ .050" .752" single pattern and mufflers we made 717 hp and 652 ft/lbs on our SF-902. Down in Ohio @ the EMC '09 with way too much timing and through 13' of 3.5" mufflers and pipe we made 695 hp in the warmups. The article on this engine just came out, here's the link. 471 700hp build

I remember reading that article. Looked like you guys spent a bunch of time sorting out some different parts. Did you try any other intakes besides that Weiand? I've run the Weiand tunnel rams before and they are usually down on power when compared to an M1 tunnel ram. But of course, the M1 tunnel rams are hard to find becauase MP stopped making them.

Yes Andy we tried numerous things and parts and within the EMC rules it was tough to break the 700HP barrier with the Victor heads-of course if I were to do it all over again I'm sure I could surpass 700HP quicker and easier. To answer your question though yes I tried an Edelbrock Victor 383 first and that is still on the engine right now. It makes 656 hp @ 6600 rpm and 612 tq @ 4200 rpm with that manifold. Yes I know that the Weiand tunnels are inferior but in my naivety chose to build a low deck and the only tunnel I could find for a b block was the Weiand. What really burns me up is I asked if I could adapt a tunnel for a 440 (knowing there are many superior choices) and the rules committee deemed that illegal as you could NOT use a manifold for a different engine family. Then along comes Mr.Kaase with a tunnel for a 351 (with 1.250" spacer) on a 400m block and nobody raises an eyebrow. He wasn't the only one with this scenario going on either. I should've just done my own thing without asking, it's not like I would've won anyways. But yes you are right the Weiand tunnels are very limited cross section wise especially when mated to a head such as the Victor. The Victors should just come in oneport option only and that is Max Wedge-there is too much CS change from port flange to SS in standard port form. J.Rob

Was the Mopar M1 low deck tunnel ram not allowed because it is no longer in production? I don't recall the EMC rules exactly. I've compared the M1 tunnel rams to the Weiand and have always picked up power at the top end. The Weiand design uses small CSA and long runners which work pretty well on some motors, but I wouldn't think it would work very well at 700 hp. You probably could used an Indy tunnel ram too. You might have needed to neck the runners down though to mate with the Victor heads.

Andy, I loved this post. One of the most read posts in a while. I love the info on this.. Thanks for continuing your info.. Merry Christmas

Just looked up and saw my post from over 3 years ago ...man does time fly!

Well as it turns out I built the motor I was talking about in that thread, how cool is that when wishes find a way of coming true?

Several years ago Steve Dulcich's Engine Masters entry came in 3rd place with the Chapman Stage VI 470" motor, it made 752 or so on the Westech dyno....reported to be 'Happy') I think had the rules allowed for intake modifications I think he could have easily won first place in the 2500-6500RPM contest by using a Max wedge ported Indy 2D.

I modeled much of my 517 low deck off of Steve's EM effort (which was in many ways also very similar to our own Moparts effort), and combined that with numerous machining and tuning elements I've learned over 30+ years of messing with these beasts. I figured if I could get around 90% of Steve's peak HP with more torque by using the exact same CNC heads on a 10% larger cube shortblock, I'd have everything I ever wanted in a Big block.... Wall to wall torque at any RPM or throttle position, razor sharp response and Hemi like top end power from 380 cfm max wedge heads.

My philosophy for street motors is almost always to build the bottom end for torque and put the best available heads on it and them select the smallest cam that will get you to the target power zone. This way you have the most useable overall powerband below the peak which is where you are actually using it 95% of the time. Plus, if I wanted to push it I've got some potential untapped power in reserve.

That said I'm pretty sure my combo is a single plane intake and a similar grind solid roller away from going comfortably over 700, but to me it's not worth giving up maybe 40+ lb feet all throughout the mid range to gain maybe (at most) another 25-30 above 5500. Opinions vary but to me a 4500 stall/5200 flash vert is a waste on the street with a 500 inch motor because you side step too much grunt and it misses the point of what a stroker is really all about.

There may be big blocks out there that may pull a few more HP than mine, but I doubt there's many that are as thrilling to drive when you factor real world roll-on, any gear, any terrain type driving into consideration. I've thought about dropping this motor or a clone of it into something like a Cobra replica just because it's such a blast to drive. It's more like a Viper motor with CNC'ed W5 race heads than it is a drag motor....and that's just fine with me.