Block decking: how necessary?

[MopaR&D]

Here's a thought... What about retarding my cam to reduce cylinder pressure? According to the dynamic CR calculator I'd reduce cranking pressure by about 8-10 psi by having my intake valve close 6 degrees later, is this difference even significant?

 

[moper]

I'm of the opinion that if you have to adjust it that far, you have the wrong cam. You can of course do that. But it will also affect (negatively IMO) the output in terms of horsepower and torque curves.

 

[MopaR&D]

I'm of the opinion that if you have to adjust it that far, you have the wrong cam. You can of course do that. But it will also affect (negatively IMO) the output in terms of horsepower and torque curves.

Well I'm not set on doing it, just wanted to find out what the effect would be and if it would give a little extra insurance by reducing the cranking compression a bit. I should just install the cam with the factory 4* advance then?

 

[lead69]

Well I'm not set on doing it, just wanted to find out what the effect would be and if it would give a little extra insurance by reducing the cranking compression a bit. I should just install the cam with the factory 4* advance then?

Mopers correct,if anything look at having the cam ground an a 112 lobe center by lunati,but again it s a crutch for the right stuff in the first place.The modern grinds do produce cylinder pressure by design so maybe try an older grind with a wider lobe separation for comparison.One thing I would do before deciding on the decking is do a mock up and see where everything is sitting and then decide if its acceptable.