What octane can I run with an all iron 10:25 350?

[Qdub24]

I can buy race gas from the store and the track where I'm at. The nearest "high quality E85" pump is about 45 minutes away.

 

[pontiacgp]

before all these mods are suggested I'm waiting to see if he gets the engine and what it's like once installed in his car.

 

[zdeckich]

I can buy race gas from the store and the track where I'm at. The nearest "high quality E85" pump is about 45 minutes away.

Cool. Want a cookie or something? Or you just like to argue on every post I make? E85 a gallon is still 1/5 (at least) the price a gallon than race fuel. And "high quality" E85 is 2min from me. Closet racetrack is an hour from me so whats your point? Im simply saying E85 is a great option for the OP. He might have a e85 station very close to his house.

 

[Qdub24]

There's no argument, just two different methodologies. I lived in TX for the better part of the last 8 years. I know that E85 pumps are way more plentiful there. I'm from GA though, finding an E85 pump is like finding a needle in a haystack there.

 

[pontiacgp]

I've plugged in the specs of the motor (piston dish cc, head gasket bore and thickness, stroke, bore size, cam specs, etc) and it put out a static compression ratio of 9.7:1. If that's correct, I think 93 will be good enough, maybe even 91. I guess I really won't know until I try. Once I put the motor in, get a gallon of 91 and a gallon of 93 and see what runs better I suppose.

are those specs of a new sp engine or the actual specs of the engine you're going to get

 

[UNGN]

In Iowa, E85 might be easy to find, but it will destroy his iron/rubber fuel system.

Leaded Race gas. You usually just need a little (like as much as can of Octane booster)

My 30 year old T-type tank was rust free inside even with years of ethanol, the reason: For years I used a little Leaded 116 - 118 gas with every tank.

 

[MrSony]

are those specs of a new sp engine or the actual specs of the engine you're going to get

Those are the factory specs of a 1970 350-4 SP code motor. I plugged in the specs to the motor into a compression calculator, and got 9.7:1 static, and a bit more than 8 dynamic.

 

[olds307 and 403]

Did Buick use factory shim head gaskets?

 

[Wageslave]

In Iowa, E85 might be easy to find, but it will destroy his iron/rubber fuel system.

Leaded Race gas. You usually just need a little (like as much as can of Octane booster)

My 30 year old T-type tank was rust free inside even with years of ethanol, the reason: For years I used a little Leaded 116 - 118 gas with every tank.

There is actually E30 available around here, good octane boost and won't melt down your rubber parts in the carb. Might have to rejet a few sizes though.

 

[MrSony]

Did Buick use factory shim head gaskets?

afaik stock headgaskets for the SP engine in 1970 were steel and .020 thick. I'm gonna use the blue felpros that are about .040 thick.