440 Spark plug happy medium

[J1MMY]

Hello folks, helping a buddy do some jobs on his new acquisition and looking for a baseline recommendation on spark plugs for a 440 - mild cam, alloy heads (so 3/4” long thread) 750 Holley, Edelbrock RPM intake. Came with Bosch plugs (?!) which are long past their best, perhaps in part due to PO only really running the engine for brief periods. No real brand loyalty tbh. Cheers

 

[mygasser]

not sure on the number you'll need but i always use ngk plugs.
neil.

 

[PRH]

Any clue on CR?

Likely you’ll want an NGK 5 or 6 heat range.

So, something like a BCPR5ES

 

[RustyRatRod]

I would "start" with whatever stock plug for the year model. That way, you'll have a base line. You can tune from there reading the plugs.

 

[PRH]

What year big block came with “alloy” heads?

 

[J1MMY]

What year big block came with “alloy” heads?

Any that are fitted with Edelbrock RPM heads

Thanks folks, in between posting and catching up with replies I’ve done a little digging, found Edelbrock’s recommendation and ordered them for now. Not a fan of Champion plugs but it’s not my engine - I second the NGK preference

 

[Bewy]

NGK 5s, as stated above.