whats the highest compression ratio i can run on the street with pump gas ,in a 455 with stage one aluminum heads?:grin: thanks guys...
Hey stage2, I ran 10.1 with no problem... but with aluminum heads you maybe able to get away with more like 10.5
hey killrbuick thanks for the info , by the way do you race your car at the west hampton track i was there this summer with my 70 skylark 455 stock motor with the juice, 200 hundred shot 3:42 gears turbo 400 ran a 12 flat at 115mph and its still runs lol .....boy was that fun thanks.:bglasses:
machine shop Hi guys, I'm on Long Island also. Can anyone make any recommendations as far as a machine shop is conerned. Thanks. Allen
machine shop hey staged2, I ran my car at west hampton in 99 i ran 11.78 112 in my regal 455 10.1 pump gas.no NOS... Allioop My machine guy is very good but you will wait a long time for it but worth the wait..the name is warner engineering...631-269-5064 TALK TO BILLY Tell him Eric with the 455 regal sent ya :TU:
In general, aluminum heads will buy you one more full point of compression. In case your unsure why this is, it's because aluminum transfers heat faster than iron. The automakers keep pushing compression higher as they learn how to better control detonation and NOx emission. A big part of this is the common use of aluminum heads.
Alot of things can make or break your compression, camshaft size, combustion camber efficency and aluminum cylinder heads. The more overlap on your cam the more compression you will beed off at lower RPM. Dead air space in your combustion chamber can also play in effect. (Especially quench and chamber efficeincy) A lot of people say 10:1, but I feel 11:1 will still be very safe, especially with aluminum heads. My 455 I am building has 11.5 to 1 and I an going to run pump gas on it. My old chevy engine I had was iron headed and 11:1, I ran 40 degrees timing (locked out) and always ran super unleaded, with no detination. Blair :stmad: :stmad: :stmad:
