Maybe the nastiest 350 Pontiac?...for now
 

Just dynoed my 350P 2.0 build and cant wait to get it in the Ventura!

584.5hp/523tq on 93 octane

BUILD SPECS

,030 custom Autotec pistons
Eagle 6.625" H beam rods
Eagle 3.75" stroke cast crank
10.7 comp. Cranks 175lb

Custom solid roller cam
244/[email protected]"
.676/.670 lift
112LSA

KRE D-port heads bought bare as cast
Custom chamber and port work to maximize potential with the small 3.905 bores
2.055/1.625 valve also for best 3.905 bore power

Victor intake manifold with tapered spacer
(Fully ported Street Dominator produced a bit stronger curve below 5000 rpm but lower peak numbers...576hp/521tq)
950HP Holley carb
1 3/4 headers

Started this build with a goal of 575hp/525tq on pump gas and a 10 sec Ventura (NA) in street trim. 2 boxes checked! Cmon spring!

Real real nice job!
That high level of torque is very much due to all that valve lift and the attendant amount of air mass it allows to pass through the intake tract and the average high level of port velocity that is made!

Air flow and velocity go hand in hand in at least a 50/50 ratio!

A whole bunch of folks on here would love to have there .060” over 428 making that much power!
Once again that’s a sweet motor !

Thank you! My dyno guy said it looked more like a torque line than a torque curve. LOL By my crude measuring methods the port is right around 295ft/sec. 301cfm@199cc

Great job! Nice build!

Excellent job, truly an impressive effort.

Maybe the price of boat anchors will be climbing now....LOL :D

wish they made an off the shelf heads like this. I bet there would be more 350P out there if they did.

"KRE D-port heads bought bare as cast
Custom chamber and port work to maximize potential with the small 3.905 bores"

I agree 100% I think the 350P should not be so overlooked. My first stab at one made 380hp/425tq with mildly ported iron heads and a flat tappet cam. The nice flat curve made for a 12.40 street driven Ventura. Making some head & cam upgrades and that one is going in my son's Ventura

Congrats on the build/achievement! Where's your local track for testing? I know here in NJ, Atco is usually the first to open in mid March for T&T if weather cooperates...best of luck with whichever track you test at!

Question: how much would you estimate you've got in this build?

Very nice build.

Can you post the dyno sheet for the fully ported street Dominator? Depending on gearing and convertor it is possible that that setup might run faster in the 1/4 mile.

Stan

Impressive! You may have started something here.

Impressive. I can't wait to see the in car results. Let us know

Mason Dixon will most likely will be its first outing. Finishing up the roll bar and doing some suspension upgrades before we drop it in.

6500ish in parts..plus machine work on the short block....build has taken 2 yrs so that figure would be higher now. Couldnt even guess how much time I have in the port work, cam design etc

I sure hope so. The little 350P has been pretty much kicked to the curb.

Will do. Hoping to be at Mason sometime in March

Very true

Which part of the whole Intake tract where you using for the minimum port area in your port speed calculations?

That was what I came up with for average port speed using formulas from PipeMax and SRH site. Min cross section was 2.26 at the pr pinch. I am sure the port speed was much higher there.

Nicely done. So much for the canard that you can’t make horsepower with less than a 4.000 cylinder bore.

Thank you!

Here are the best pulls for a ported T2, the ported HSD, and a reworked Pro Products crosswind. Really think the PP intake will be the best street intake? Wishing I had spent more time with the PP but we had 5 intakes and 4 carbs along to test. Knew it was gonna be a long day and honestly was chasing numbers. Sigh. My wife wants to take it back with some customized spacers and see if the smaller intakes can be made better. 24 pulls now....I think its time to put it in the car and tune there!

73 Ventura. 3450lbs. Th350. 3.90 gears and 28" tire

Thank you. All depends on what the chamber is designed for I believe. Above .400 lift the flow on these heads get really unstable on a 4.155 fixture but is smooth as can be on a notched 3.91 fixture.

Recently had a set of KRE CNC chamber heads here and it was completely opposite....lost 15cfm by. 500 and kept getting worse from there. Same with the E heads I originally started the build with.

Was the T2 ported for a 4500 carb?
Any pics of it?

Not actually ported to a 4500 but with some grinding to open up an adapter I think it may really like one? It liked a 2" spacer with the 4150

I'm doing a 350P now, great to see your post. Can I ask a few questions? As-cast the KRE chambers are 65 cc, what size did you end up with after working the heads? Did you find you needed the block eyebrows with the small valves?

You topped the big blowhards 350 in power, well done.

The heads as cast as delivered were actually 70cc. After my mods they were 77cc. I had them milled .100"(yes you read that correctly) and they landed at 62cc.

I did not need the notches for clearance....those valves would free drop down the bores... barely, but they did clear. But when I added the notches to the bore fixture it made a HUGE difference in airflow

Thank you!
When I built my 1.0 version it made 385hp/425tq with 8.8comp, flat tappet cam and mildly ported iron heads I was pretty proud. Posted it on a FB group and he basically told me it was a joke and NO ONE would ever beat his "King 350". Challenge accepted!😎

Where I differ from him is I hope someone now realizes these little guys have potential and instead of scrapping one builds one better than this one. Pretty sure I could have topped 600 with this one but Mama told me it needed perfect street manners. Little cam made for a helluva torque curve though

Very nice!

Seems the 3- Intakes are within measurement error. But my real point is to wonder which Intake promotes the best acceleration under load in the 1/4 mile.

Luckily they sure will be easy to check at the track!

Who'da thunk?:eek:

Congrats and thanks for sharing your results.

Kris.

Very nice engine! Who needs a 421 etc. to make power?

After watching Engine Masters within the last week on Motor Trend they had a NA 350 chevy that they dynoed, and you exceeded their numbers. When you're able to exceed the engine that has had more development time, and money thrown at it in the last 65 years, you have really done something well....:thumbup:

Nothing I like better than to see a chevy beaten by a Pontiac on an equal playing field. As long as your car hooks, your gonna break some hearts.....LOL

How does a 350 block compare in strength to a 400 block? Does anyone know ?

Great numbers! Nice to see this ...

Great job!

Since this is the street forum, I hope you are better at traction control than I. First gear on mine (only 430 HP) is worthless on the street when driving in anger ;)

Jon.

While we are handing out over due applause for killer Pontiac 350 motors let’s go back to 1974 and Burt Straus and his Sunbird that I saw run a 8.85 in the 1/4 mile early that Summer.
It was well worth my two flat tires that I had to deal with to get to Englishtown and see that take place!

Nice work! Thanks for sharing.

Steve,
I saw Burt at Englishtown also (not sure what year). While he had to run factor iron heads, most of the ports (intake and exhaust) were nowhere the factory location That is what could seen just looking at the engine. Have no idea what one might have seen looking at the head from the combustion chamber side.

Stan

For years, Tom S. and I have been discussing WHY so many Pontiac guys dismiss the 350P. Tom has advocated for a stock stroke, stock rod length build using either the KRE or E-heads. This build SHOULD open eyes AND minds to the potential of the 350P when properly planned, engineered and built.

POS Racing, I’m going to assume you utilized an LS piston blank and ring pack with your pistons?

Stan, I never got the chance to track him down in the pit’s to see the car.
As I recall a thunder storm rolled in and I headed home.
Is he still with us, does anyone know or has he passed?

Love to see a nice 350P story...

Awesome! I have been wanting to do a similar build for a while.

Tell you what, these days I would not have chucked that std bore 69 350 block. Even they are now worth something.
Nice job OP.
Who is the big blowhard ? Flopper ?

Congratulations! Your hard work really shows on those dyno sheets. Maintaining the torque line, (your words), is extra impressive. The hardest part from here will be convincing people it's a 350!

Outstanding build! Thanks for posting. Great information.

Since i have a 350 block sitting on an engine stand wondering if it will be built or wind up in a scrap yard, i found this topic interesting.

a ballpark calculation puts the VE of this engine over 120%.

The best way to look at the power level that the 354 cid motor that started this string is producing is that it’s making 1.47 ft lbs per CID.