fast01

iTrader: (16)

806 casting CNC'd with stock 2.00/1.55 valves and Crane 144832-16 dual springs and matching steel retainers. The rest of the specs are:

67cc chamber
213cc intake runner
78cc exhaust runner

Flow:

.100" 63 57
.200" 128 103
.300" 188 141
.400" 234 176
.500" 268 196
.550" 283 206
.600" 289 212

5.3LJimmy

iTrader: (10)

The flow numbers are decent, but if you are running stock LS6 heads it won't be worth swapping. I'd guess about 20 HP over a stock LS1 head give or take a few.

fast01

iTrader: (16)

Thanks for the input! These are now for sale in the classified section if anyone's interested.

https://ls1tech.com/forums/showthrea...117&highlight=