1974 440 (230HP)

[moparterry]

I have a 1974 440 in my Charger, it is the 230 hp version. What do I have to do to make it the 250 hp version?
I also have a set of 1971 HP exhaust manifolds(would this help).

                                 Terry

[hemihead]

Get a set of Flat Top Pistons .

[moparterry]

It already has flat tops. So now what cam and carb jets and what else make the extra 20 horse?

[firefighter3931]

It already has flat tops. So now what cam and carb jets and what else make the extra 20 horse?

Are these stock flattop pistons ? How far below the deck surface are they ?

The stock pistons for a 74 440 are very low compression....in the 7.8:1 range. It's difficult to make good power with such low static compression.

HemiHead was suggesting that you swap out the pistons for an aftermarket flattop like the speedpro 2355 6-pack replacement pistons to bump the compression up.


Ron

[NMike]

that low compression is perfect for boost. but the cast pistons won't like ir for long