What Did The Ported Promaxx 290 Heads Do On The Dyno

[@xozindustries7451]

I was watching Total Seal’s interview series with pro stock engine builders like John Kasse and Warren Johnson and they had interesting point, they said A to B Dyno testing can lie to you and make the car slower even with more horsepower because without optimizing every combination the car can be slower because it’s not using the power effectively, it’s the same thing you said about the ported heads and two intakes. Great information, I can’t wait for the 540 testing

[@jrdmotorsports9718]

That goes without saying when changing any power curve, and rpm the curve is in. When a chassis is setup for a given engine's power curve, anytime you steer from that, can HURT performance if the chassis is not corrected for the change. It is not just a power change, gearing, tire size, converter, etc.. all do the same thing. So I wouldn't say the dyno is lying with differences in power, as most do think it is because they get a false impression of having a faster car based on more power, until they run it and go slower because the the car isn't set up for it. It's not the added power that did it, so technically it wouldn't be the dynos fault, or the added power to a given combination. I see this all too often, and always advise on how to set the car up for the added power, or the car WILL go slower.

[@johnginnitti4598]

Thanks for the excellent content Eric, guys, the channel membership with the purchase of a book is a great deal. the realtime results from the dyno sessions are really cool, you'll love. buy a channel membership and lets help this guy out.

[@michaelparadisis4076]

Great test. Well done Eric and thank you for your efforts.

[@williamstel9330]

Eric, i do wonder like you, if you were to run the roller cam with the higher lift, if it could have hit 750 hp. And would wonder about the feasibility of running a cam like that on the street. Although a mid to high 600 lift may be more reasonable, in solid roller. I kinda remember that you had said about the hydraulic roller loosing lift.

[@robertwest3093]

When Chevrolet was designing the big block back in the early 1960's I always wondered what made them siamese the intake ports but evenly space the exhaust ports. Certainly they knew their design would have different runner lengths. I noticed that they corrected this on the last generation big block.

[@timothybayliss6680]

If you find a photo of an injected IR BBC that was used in CanAm racing in the 60s/70s they have two different length trumpets. The McLaren M8F shows this to a tea.

[@JAGMotorworks]

Are you running 630 lift on the heads that say max 600 or did you change something. Sorry if i missed it. Thanks

[@txripper1]

Curious what a LS6 head flows? Is there a way to calculate how much it would flow at 10psi boost? Thanks

[@cassandraclark8568]

Boost doesn't make the engine consume any more air, it just makes the charge more dense 🤦‍♂️

[@jrdmotorsports9718]

A head will flow the same amount as it does without boost. Boost doesn't kmow or care what a head flows.

[@ericsmcmahan]

Eric Weingartner, what do u normally shoot for on short side air velocities? Low to high?

[@richardsmith-qy6vl]

Impressive I'm sold on the Promax heads I want to see the new strub small block heads

[@stevensung7694]

I could help

[@warrenpemberton-ww9fq]

Keep up the good work I got a goal to go for thanks

[@moparjohan]

Fuel trail! It sure looked like exhaust reversion to me 🤔

[@WesAdams-HillsideAuto]

I didn’t catch it but what was the total timing with those heads? Thank you 🙏🏻

[@WeingartnerRacing]

36

[@WesAdams-HillsideAuto]

@@WeingartnerRacing thank you sir!!!

[@WesAdams-HillsideAuto]

@@WeingartnerRacinggreat info by the way! Thanks for sharing

[@trailerparkcryptoking5213]

What size engine was this?

[@WeingartnerRacing]

496

[@trailerparkcryptoking5213]

@@WeingartnerRacing that torque curve looks fat and flat! 👍

[@rickyfulks889]

Do u think the exhaust valve is oversized being a top fuel engine runs 1.94 exhaust??

[@jcnpresser]

Probably can’t open a bigger valve without breaking stuff on top fuel.

[@davidreed6070]

Putting a smaller ex valve in BBC heads makes more torque... So the Big boys say.

[@timothybayliss6680]

If you are going balls out you run a smaller ex valve just so you can fit a bigger intake. ProFiler spread port heads use a 2.45 intake and a 1.85 exhaust valve. Just putting a smaller valve in would not help

[@davidreed6070]

@@timothybayliss6680 and I agree, I think people over exhaust na engines, blown and nitrous engines are different because of the amount of ex . In my opinion.

[@theshed8802]

Darin Morgan was talking about pro stock motors where they are opening the exhaust valve when the piston is 1" down the bore so they have adequate time to blow the cylinder down before bdc, or else the pumping losses of blowing the exhaust out become excessive, and there is too much residual pressure still in the cylinder during overlap. The point is that different motors, with different fuels, in different applications require different set-ups. I was working on a 60L V16 diesel the other day. 4 valves per cylinder, all the same size. Lots of boost, rated power at 2300rpm. Different fuel, different application.

[@gmcnelly2468]

THANKS!

[@chevyrc3623]

That's a pretty cool and yeah that's awesome the bigger head won

[@impalaman68]

Eric As a customer of yours I would love to see what your ported Brodix Racerite ovals would do. Maybe next go around.

[@daveunbranded]

Where is 290 heads? I couldn't even find them

[@WeingartnerRacing]

Don’t know what you mean.