440 12:1 compression 93 octane ??

[44070dart]

looking at ...440 engine 509 cam 12 to 1 compression ..street engine 93 octane or not:edgy: if race gas / octane boost I'll pass on it

 

[69HEMICORONETR/TCONV]

Way too much Compression for Pump Fuel, even if it is 93 Octane, You would have to run Race Fuel or drop the compression ratio.:yes:

 

[44070dart]

yeah .. kind of thought that .. too bad .. thanks

 

[68GTX4SPEED]

Where is the compressionlimit at 93 octane steelhead VS aluminumhead.

 

[69HEMICORONETR/TCONV]

Safely around 9 on a cast head, about 10 on an aluminum head.


and that's considering today's crummy fuel quality.

 

[68GTX4SPEED]

Thanks

 

[44070dart]

9:1 safe compression 93 octane premium gas $3 plus a gallon ... versus 93 octane $.35 a gallon and 10 plus : 1 in my fathers 59 dodge 4 door family car in 1967...ran like a monster weighted 2 tons . guess I'm getting old sound like MY father longing for the old days ...when it rained and the dodge wouldn't start he wished he had his 38' Old's back

 

[dbowperson]

I run 10:1 with stock steel heads with no problem. You can add about 1 point with aluminum heads. 10 is about max for steel heads, though.

 

[dodge41969]

That's waay too much compression for the street/pump gas!
and that .509 isn't a very good cam, that grind has got to be at least 40 years old!, you'd need 12:1 compression with that cam to make it work!
theres soo many better choices out there in cams.

 

[696pack]

I run 10:1 with stock steel heads with no problem. You can add about 1 point with aluminum heads. 10 is about max for steel heads, though.

That is about right IF you have a good quench motor.

 

[george68hemirr]

11.5...pump gas...aluminum block and aluminum heads