The Great Intake Debate: Dual Vs. Single Plane Intake Manifolds - Engine Power S8, E13

We test multiple configurations of our V8 to see what makes the biggest difference on the engine dyno.

Part 1: How To Achieve Power Gains Without Taking Apart Your Engine

Part 2: Testing 4 Common Engine Building Myths: Which Ones Are True?

Follow POWERNATION Everywhere:

PARTS USED IN THIS EPISODE:

Holley: Holley Sniper EFI XFLOW

Sea Foam: SeaFoam High Mileage Motor Treatment

Summit Racing: Engine Upgrades: Exhaust, Induction, Carburetors, Ignition, Valvetrain

Matco Tools: MATCO Tools are the Official Tool Supplier to Engine Power

The Industrial Depot: Tools, Hardware, Shop Supplies

[dennisdunton]

Back in the 1960's the reason we used zero preload was to prevent lifter "pump up" in case of valve float, NOT because we thought it made more power.

[FordRanchero]

Do a set of camshafts with the same lifts but different duration and different LSAs. We all know what they all do but to see a video of them all, that would be neat

[DJ--]

Really like these types of videos, swapping parts for testing and comparison. Super informative, love the content guys

[lordofthewoods]

One of the craziest things I've seen: My first car (bought in '76) was a '69 Torino GT, with a fairly worn-out stock 302 2-barrel and 3-speed manual. It would stop pulling at about 5200 rpm, which I attributed to valve float.

I was buying up parts to build a serious 289, and had a single four-barrel tunnel ram on hand. I also came across a Holley 465 cfm four-barrel (I think the smallest they made, w/vacuum secondaries, of course) that an acquaintance was selling. So I thought: "Why not?" I was running the 302 HARD, since I was planning on replacing it anyway.

So I popped the tunnel ram and Holley onto the otherwise-stock 302. Started EASILY pulling past 6000 rpm, and was otherwise a MAJOR improvement in power from launch on up. Only thing I can think is that it worked so well because the carb was SO SMALL! : )

[yarrdayarrdayarrda]

15:57 People who work with EFI will have a chuckle at how the crankcase vents in the exhaust stream directly ahead of the oxygen sensor that the Sniper unit is using to read and calculate fuel flows for the unit. Added air "fools" it into thinking the engine is lean and therefor enrichens the mixture.

[jakewashere.]

Thank you finally someone actually understands how to set lash on a hydraulic lifter whenever I explain this to people they look at me like I’m stupid

[kenswitzer]

Great video guy's. I have always turned 1/4 turn after zero lash with really good results. People kept telling me go 1/2 turn but understanding hydraulics and design of the lifter it only made sense to me to lightly preload since the lifter was designed to do it's job efficiently.

[aaroncooper]

I love seeing what these parts do with a stock cam and compression to get a base line on small changes. Because sometimes people dont want or dont have the money to get to deep but want there car to be as efficient as it can be. Nice test!

[baukevanderkooi]

This video came just in time, I am working on a Chevy with a 305 and wasn't that sure about some timing things, so this saved me.
You guys are heroes!
Greets from Holland.

[Andy]

before you do a cam, i want to see a 1.6 ratio rocker arm swap on just the exhaust valves and then a full all round 1.6 swap. because no one ever tests the stock cams and changing the lift via the rocker. i want to know what everything else really adds compared to a cam swap, cause we all know that a cam ads power

[elmerfudpucker]

Remember folks, it's not the engine they're comparing, it's the intakes and fuel deliveries. A worn out 305 is good, as long as it's the same worn out 305 with every test.

[camerondavis]

I really want to see what throwing a fresh timing chain on it would do

[amoruzz]

Good job.
Everyone should own a Dyno!

[timothydeyoung]

Good idea working on a base engine to show the increase with the dif. manifolds

[RKP]

Can’t believe that old worn out 305 picked up power with a 950cfm carb. I figured that would of been to big for that old stock motor.

[adampatterson]

You can basically get any SBC engine to make 1 horsepower per cubic inch and run over 100, 000 miles and that includes the 3 V6 variants. So how is the little 305 junk??? The challenge here are you smart enough to make a small engine put out good power and stay together. The money we spend on our junk does not play into it. If you want to talk horsepower per dollar you just go buy a complete engine ready to run, but what fun is in that???

[cmdr_scotty]

on my '87 CRX after i rebuilt the engine, I'd put about 3/4 a bottle of seafoam into the gas tank, and the last 1/4 in the oil. ran that several times, doing a full bottle every 3rd gas tank and a 1/4 after every oil change.

took a while but it vastly cleaned up all the gunk that was left behind in the rockers and oil passages in the crank/rods and cleaned up the valves really good

[PumpkinDefender]

I’d love to see a cam kit, a thinner head gasket to bump up CR, and different types of headers next.

[denzilmckenzie]

I’d love to see a power run with just new valve springs

[Mike-xtot]

Circle track guys may consider "zero lash" by taking out lash altogether and adding washers inside lifter to greatly reduce hydraulic space. Making it act more like a solid lifter. Alot of measuring is done inside lifter bore and the whole job is alot of time taking measurements.
It does increase power by a few.