[L78toLT1]

Originally Posted by KingLT1

Depends on boost level. 5-6psi will allow whatever E is at your pump(Normally E75 on average). 7-8psi will need mixed down to E50-E60. 9-10psi E40-E50. Boost changes with temperature. so either lower boost by moving up to a larger pulley in the cooler months or reduce E content. I normally just reduce E content because you don't need as much octane with cooler denser air and anything above E40 is plenty of octane for most builds anyway.

King, what are your thoughts on the balance of E head room provided by a 32% or larger fuel lobe vs the additional fuel demand resulting from the larger cam, assuming a similar level of boost? Obviously, the cam specs will also need to be considered. For talking purposes, assume a .635/.635, 228/218 bumpstick.