408 6pack setup

Do you know what the heads flow. Just as an example my edelbrock alloys only flowed around 238cfm stock at around 500 lift and stalled above that. Your cam only has 520 lift on the inlet and once you take away the lash it's only just over 500 thou.

If yours flow around this figure and are stock with no porting they won't have a very large area and could well be a cork in your combo. I use the rough formula of 2hp per cfm maximum so it might only make 480hp with a huge cam,comp and ideal induction. Your cam isn't the biggest around especially in a stroker so 440hp flywheel may be what it's making or even less.

I have learnt my lesson with big cube motors and heads that don't flow enough / don't have enough port volume, anything I build from now on will have well ported heads on it over anything else. My heads are going to come off my 408 soon for a full port job and go back on for a back to back comparison to show what extra it can make with same cam and compression.