CheeseNR7

iTrader: (1)

I am building an iron head / iron block 496. I want to run it on 93 octane. How much compression is everyone running???
thanks

slow95z

iTrader: (33)

don't go much over 10.5 comp. and you'll be fine.

JUICED96Z

iTrader: (2)

I had 10.5 in my aluminum headed 468 BBC and with a pump gas timining in it it still like the race gas a little more. keep it in the 10 range and don't go crazy with the timing.

My last car liked the Sunoco 94 the best and it was a stock internal LT1 with a 92 octane tune.

WickEdSix98

iTrader: (4)

No more than 10.0:1

Daredevil_TA

iTrader: (6)

why can't you run higher compression in BBCs like you can in SBC's?

slow95z

iTrader: (33)

they are much more sensitive to detonation from the extra fuel needed to run the larger displacement.

Fast93Z

iTrader: (1)

c'mon go all out, my friend roger has a 14.5:1 compression on a 250 shot in his third gen

DarkJuggalo

iTrader: (6)

my buddy in his 468 runs a 12.5:1 on pump gas with some extra additives. it pings a lil on the street but if he goes with 91 or better with a bottle of additives it runs perfect

slow95z

iTrader: (33)

those octane boosters are terrible for carbs and injectors though. they leave residue that turns into a sticky wad like tar. tried that for a while too.

CheeseNR7

iTrader: (1)

thanks for the input i was trying to decide between 10.0 and 10.5 i know the iron head holds more heat and will detonate easier. I will proably keep it to 10.0 on 93 octane i dont like the octane boosters and i dont want to run race gas this car is going to be street/stip not a full race car

JUICED96Z

iTrader: (2)

Ill be up in that range with a 300 shot but will jet it down most of the time so I don't hwave to worry about it.


Street car also.