Howdy,

I was asked to share my 511 low deck build that will live in our "68 Dart GTS. The engine was built within the following parameters:

-Must fit under stock hood with n20 plate and 4" filter

-Can run on pump 91 in a pinch (I am a Sunoco 110 guy)

-Stock appearing long block i.e. aside from headers, intake and carb it resembles an original 383 magnum

-250hp nitrous friendly

-target hp/tq 625/625, 6500 max engine speed (shift 6200ish, cross stripe 6100ish)

The car is 3550 lb on the starting line with driver etc. I am moving up to a 28x11.50 ET Bias DOT and also have a set of 28x9st (stiff wall) to try.

Howdy , I see no dyno sheet

The parts list:

400 block, aluminum caps/studs
4.250x2.625x2.200 PEP crank
RPM rods, 6.535/2.200/.990 with ARP 2000s
4.375 bore w/ 12.5cc reverse dome pistons, 1.32CH 1/16×1/16×3/16 hellfire rings

440 source heads decked to get 80cc chambers
REV valves, new guides, two new seats amd a light bowl cleanup.
Comp 1.5 ratio steel rockers
Tensilemax retainers with CM locks
Isky 9915 springs at 1.930ish IH
3/8 push rods
Stock 68 383 valve covers

Bullet solid roller spec'd by Hardcore B
-.650 lift, 275/280 109 street roller


Holley SD intake with the floor dams removed

4150 1000cfm Thumper carb

1-7/8×3" headers

That should be a very fun street car !!!!!

Dyno sheet:

An in progress shot

Very nice build and results! Similar build to the 505” in my ‘73 charger.
Any port work done to those stealths? Were they cnc stealths or standard? Those Comp Magnum rockers have been serving me very very well for 3 years now with track time and lots of street miles.

Good luck at the races…..should run real hard.

The heads were not ported. There has been speculation that a bigger intake and backing up the cam a few deg would net substantial gains.

Thank you for the feedback kn the rockers. I thought they were an exceptional value.

Still rocking the all aluminum crash box:

Nice, how much compression?

11:1 CR

I usually run a 50/50 mix of pump 91 and 110 on the street. 112 or 116 on the kit depending on the jets.

Ty!

Nice! I was surprised how low in RPM the power peaked but, it's a small head and intake ...AND header. Impressive to me for sure. I think this is an interesting comparison between the 512" AndyF posted with bigger heads and intake but smaller cam.

That's super inconspicuous, I dig it! Really impressive power from unported Stealths!

Looks fun!

Anyone else notice the "L2" AFR bank is consistently leaner than the "L1"?

275/280@.050?

274/283@.050 to be exact sir.

There was an exhaust leak developing on the last two pulls.

For the morning crew

IMO, That is a lot of duration for only 11.0 CR

Impressive build for sure, especially when you factor in the unported stealths, which are the current cork in the system.

The Holley SD never disapoints, best low profile manifold for the BBM ever made.

I would think that cam has too much duration also, but it seems like a great match for the rest of the combo.

Iplease keep the following in mind - ts a small tire stick car that races om limited or no prep. Not a bracket car that hooks a 14x32 in the car wash lol. I'm more into all out racing cmpetition than the stop light to stop light fonzi car show thing too. 1/8th or 1/4 mile from a dig.

The plan is a bigger intake/glass hood and some CNC work on the heads. I don't want the engine making 500 ft lb of tq at 2500 because it makes the car undrivable on the street. Those of us that have big hp cars woth a limited tire and a stick know what I am getting at here.

As it sits we will make 800+ on nitrous.

To all of the " i would have done it different " cfolks...what would you do and why? Keep in mind that this is a small tire, limited prep street strip car with a stick.