869hp on pump gas

461ci. sbf
https://www.youtube.com/watch?v=oJRMLfrlPvg#t=405

98 Octane "pump gas" with 12.5:1 compression. Really cool.

Nice build. I've never seen 98 octane fuel at any stations around here.

Ive never seen any 98 pump around here ether.

We used to have Sunoco 101 at several stations around town. Gone now, 93 with 10% ethanol....best you can get at a pump

All the VP fuel we sell comes out of a pump. Pump gas for the win!

It is a pretty cool build though.

We have 97 and 98 premium around here no ethanol in premium and several places sell 110 Sunoco or Turbo Blue at the pump. Mid grade is 89-91 with ethanol.

In Australia, the stated octane rating is the RON number not (RON + MON)/2 like you guys in the US. Dandy Engines in in Melbourne, Australia.

StephenW wrote:In Australia, the stated octane rating is the RON number not (RON + MON)/2 like you guys in the US. Dandy Engines in in Melbourne, Australia.

This, it is a Down Under thing. I have not seen any coments on the Chi heads and intake. Pretty impressive, those 3V's.

98 RON gas would be 93 or 94 in North America.
From Wikipedia:

Research Octane Number (RON)

The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.
Motor Octane Number (MON)

There is another type of octane rating, called Motor Octane Number (MON), which is a better measure of how the fuel behaves when under load, as it is determined at 900 rpm engine speed, instead of the 600 rpm for RON.[1] MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON, however there is no direct link between RON and MON. Normally, fuel specifications require both a minimum RON and a minimum MON.[citation needed]
Anti-Knock Index (AKI)

In most countries, including Australia and all of those in Europe[citation needed], the "headline" octane rating shown on the pump is the RON, but in Canada, the United States, Brazil, and some other countries, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).
Difference between RON and AKI

Because of the 8 to 10 point difference noted above, the octane rating shown in Canada and the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel. This difference is known as the fuel's sensitivity,[4] and is not typically published for those countries that use the Anti-Knock Index labelling system.

So would this 12.5/1 compression engine be OK on our american 93 octane fuel, or would the antiknock sensitivety difference cause a problem? Seems like it would be too high.

Depends on the cam, static build is a starting point, but if the thing has a long duration cam in it, cylinder pressure at lower RPM is going to be relatively low. Much of the high performance stuff from Ford and Chevy is in that neighborhood. And does fine on 91 octain US pump gas.