Air can follow a 7° curve/angle. Or a straight wall with a 14° angle.

Beyond that, it boils off and chokes off the flow to a narrow area.

049 heads have big potential. They have an easy NA 550hp in them, but that depends on where you make your peak RPM.

Oval ports with blowers would work really well. As long as you get close to the requires Cross Sectional Area of the ports etc. The CSA needs to be tuned to the task and the port/valve etc. Often making CSA a little smaller CSA is what is required to get the port air velocity up.

MR 525 intakes can get away with a bit of the cornering with dry, unfueled air. If the int man ports are enlarged at the elbows, it slows down the air to make the turn, but it also losses energy, making the pumping losses higher. They'll work for you on a 454, but the length of port will play a factor. Once they get too long, a larger port diameter will not help. The air velocity will tank.

Porting to gaskets is a paradigm. Gasket makers know zero about the best port size for your engine. There's just bigger and smaller ones. Nothing wrong with a 40 thou gap in the int to head port transition. If anything, it it would help as a liquid fuel atomization zone.

The intake to head transition just wants to have no steps protruding on the head side. Smaller int man ports into larger heads are not as much of an issue.

Porting to a gasket can make the port larger and needlessly bulge it out...slowing airflow, losing velocity.

To properly port match, place the intake on the heads with the gaskets you're using. Put a camera down the intake port and see how it lines up. For that matter, just because you port match to the gasket, doesn't mean that the ports will line up vertically when installed. All depends on gasket thckness.

Did I miss where you stated HP goals? I've just seen 5800-6000 rpm.

049 heads need to be properly ported before you increase the int valve size, or it will choke off hard at low lift. The air draw is very soft. It's like drawing the air in with a slinky spring, vs a valve spring. The following air just doesn't have the same velocity and energy.

Int valve throat (no more than 90% dia of int valve) should be the smallest CSA of the intake track.

A 2.06" int valve has an area of 3.33"sq. 90% is 3.00" CSA.

The curtain of the int valve lift at 0.500", is about 3.25" Sq CSA. So if you're running low lift cams that don't exceed 0.500" lift., the valve curtain area is the smallest CSA.

I meant intake port matching.

My current combo, the intake is Holley oval single plane EFI. 1000cfm TB.

Thanks Smitty, now they are all gone in one night. lol
I just drew them up in 5" & 6" air filter sizes and printed a couple rubber ones up.
What filter have you been using with these throttle bodies?

still shows one left if you wanted to buy it for a template to copy

yes, I have several as Ive seen a 35+ hp gain using them on a 102/ 105 mm tb and still have 2 new proflow rect ports and modded TBs for my upcoming personal twin 548 project on my own boat. I AM going to buy one of the holley tunnel ram, front tb intakes though for my dyno test on intakes, its still my be a little big even for my 548 though, Smitty

Smitty,

Might you be willing/able to send me one to measure up?

Thanks. Brad.

I posted this years ago. Pump gas marine 502cid top rpm 5800rpm.

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Swap Shop:

500 efi intakes/fuel rails/ throttle bodies

I will when i get a minute, been dynoing those 2 whippled gen 7 8.1 this week I was telling you about, putting engine 2 on dyno today, ill try to see what scanner shows for timing under boost for you too but its probably conservative (whipple tunes). Thinking of building something from aluminum or do you 3d print on top of machining ?