When we built Mopar Billy's little 408 in his race car, it was 11:1, solid FT cam, and Airwolf heads. That made just over 600HP on our dyno. Runs well into the 10's with a NOS cam to boot.

I don't think I'd ever put a hydraulic roller in anything I was going to run hard. At least a flat solid or a solid roller. My 408 was 10.8-1 with ported Edelbrocks and a 260/264 flat solid. It ran 6.57 @ 104 and change in a 3260# Dart on pump 93.

I'm not sure which notion I would abandon first............the " shelf cam " , or " Hydraulic roller ".
Probably in that order.
It is so easy to have a cam spec'ed for your combination these days and several cam companies are very good at it.
I really like Bullet...........they have done a solid roller and hyd. flat tappet for me and I am happy with both.
Two totally different motors , but they listened to my ideas and added theirs.
They aren't just selling parts , and they have the experience to recommend what will work.
I have no experience with Hyd. rollers , but for serious performance it would not be my first choice.

Yes, Dan Smith aka Qwkmopardan on here has no problem building a 420 inch small blocks using solid flat tappet cams and with iron heads that run around 10.0's in several cars for himself and others.

I know that he like to run Racer Brown cams in the engines he builds.

He built the 451 that's in our 69 Dart GTS (383 auto car).

He mostly just races for the $$$ in Pro and Super Pro but several years ago he won the Byron Wheel stand Competition..

Here is an interesting build. LS7 Chevy, 440 inches, cam is hyd roller with 244/257 duration and it makes 700 hp at 7000 rpm. I think the difference is the heads. The LS7 heads are better than any Mopar head except maybe something exotic like a W8. I'm still surprised that this LS7 was able to make 700 hp at 7000 rpm with only 244/257 duration. I guess we have to assume that the article is correct but I think it would require at least 10 degrees more duration to pull to 7000 rpm if not more.

https://www.hotrod.com/articles/tested-442-cubic-inch-ls7-dry-sump-stroker-700-hp-pump-gas/

looks like they used these heads.
https://americanheritageperformance...ahp-cnc-br7-archangel-ls7-cylinder-heads

out of curiosity for my own project I was wondering what the E/I flow balance was. 250/418 is roughly 60%...i guess i won't stress about it an exh port that doesn't flow amazing...

I am not at all surprised by this, it's not hamstrung by an almost 60 year old design. Most Pro Stock engines are running around 275 @ 0.050", even back when they weren't RPM limited.

You could probably do something similar with a Gen III Hemi

The technology in that head/engine is light years ahead of anything for a small block Mopar.

You should read about the motor my engine builder won a competition with. Stock stroke, 11.66 compression 360. Made 773. Then 737 with mufflers on a 90 degree day at the competition to win it.
Yep, heads matter.

https://www.enginebuildermag.com/2018/11/eotw-376-cid-mopar-engine/

High 10s is really easy and doesn’t take 600. I would aim for 550. I had a simple combo that ran 11.00@122. I drove it daily and it wasn’t a race car. Here was my combo. It was all steel nothing done to lighten it. Power steering and power brakes. I never optimized it. Only made a few passes.
408 stroker
10.7 compression
Indybrock heads
Victor intake
750hp Holley 1 5:8 tti headers and full exhaust
Comp xe 286 street solid roller 248@050 .577 lift
1.5 rockers
Tci street fighter converter. Super tight 2600 stall
4.10 gear and 28” slick
Same combo ran 11.24@118.78 with mild ported edelbrock rpm.

I would not recommend a hydro cam for what you want, but I can throw you a bone on a solid FT cam....My 408 uses an off the shelf Hughes solid flat tappet (HUG STL6468AS), 264/268 @0.05. This along with ported Edelbrocks, Victor intake, 13:1 compression, and dinky 750 e85 carb, 727 trans with 8" converter, 4.10 gears..... runs 10.1x @ about 131mph in my 3250# Barracuda (probably close to 600hp, but I never dynoed it). It will go a little faster when I get the kinks worked out on my bigger e85 carb, probably 10.0x (hopefully this spring).

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dam u guys got some bad a%$#$%% small blocks

Fly fish...... 904>727. Simple mopar math . Great sounding combo until we got to that dump truck trans

lol

Yes those are a lot easier

I run a 227/243 115.5 cam in those. With supporting mods, 580 rwhp.

I had a conversation with a guy yesterday who has been playing around with a 416 on his engine dyno.
Ootb TF heads, Comp XR286R cam, Victor intake, the bigger TTi headers.

605hp so far.

Do you know the compression?

I don’t think I asked, but I’m pretty sure they’re running it on pump gas.

They were baselining the motor with the std Victor intake and a shop carb, and are swapping to an Edelbrock EFI system.
I believe it’s going on a street car.

I can see that happening. 700 hp with a smaller cam from the LS7 is a bit eye opening.