Fuel octane on hp 273charger engine 10.5:1 compression .

stroker402 said

I have complete bone stock internallly >>> 273 dartcharger with all the good stuff.. has the 10.5:1 compression ..
I checked the cylinder pressure with a compression tester .. engine hot with carb fully open . and numbers are between 180 -182 lbs/in. is that normal for this engine ? seems pretty high for a 10.5: engine doesn't it.
appears I would for sure need to run Premium 93 octane fuel. engine runs great !

Click to expand...

Sounds about right , my 340 has 10.5 and cyl pressure was 190 , it was a fresh build when I last tested it .I run 94 octane gas all the time , shop that built it recommended I use 94 . So far over 10,000 miles and no problems .
Stick with 93 , with that compression you need it , back in the day that car was using sunoco 104 or 106 , if you could find some fill her up , bump up the timing and see what the car can do .