How much can you deck a 440

IMHO as long as the top ring is below the chamfer, it's a non issue.

IIRC it took .007 to square and zero my 493.

Kevin

I decked a 413 truck block .146 last fall.Dave

Decking has no affect on pushrod angle. The decks are always cut square to each other and 90* to the bore.

Okay, good to know. I did not know if the push rod to rocker arm contact point was absolutely perpendicular to the lifter bore. In some engines they are not, due to optimal valve location/angle and resulting valve train geometries. Too much decking can compromise the geometry to an unacceptable point.

Perhaps. Still curious about the answers to the question for my own knowledge base, but some more background. Pretty much any flat top piston to bump me into the 9:1 area will have a top of piston above the bottom of the chamfer. Does anyone see this as an issue? Seems like a nice little pre-detonation "chamber". Thanks.

The late 70's RV block I am working with has a .106 deep chamfer at the top of the bore.

Three part question:
How much can you deck a 440 block?

How much before you need to cut the intake manifold?

How much before it negatively affects pushrod angle (street cruiser engine)?

Thanks!

For every .010 you cut off the head surface you take
.0095 off the intake surface.. how well do your ports line up
now



Mike for the BB, the correct known ratio is for every .010 you remove .0123 from the intakes surface, or the heads intake surface.

But, that doesn't have to be followed as gospel. As you continue to shave the head or the deck say .010, the intake/ports will keep scooting up in relationship to the heads. That can be a good thing, if you raise the port roof on your heads during porting.

A .040 deak/head shave is the max that ive gotten away with without having to touch the intake side.

The block I decked .146 was a 413 truck block that was bored to 4.25 and fitted with 11.5-1 max-wedge pistons. With a set of 516 heads on it the compression worked out to 8.44-1. To get to the blueprint spec of -.015 deck height I had to deck it .146, I also milled the intake .180. Final compression worked out to 11.88-1. The motor is all bolted up to the dyno but haven't had time to fire it up yet.Dave

I do hit the China walls too though, so there isn't a funky step for the valley tray.

That is something most shops fail to do.

I have a 383 that is cut about .030 and the heads had about .050 off them, I had to take about .075 off the the china walls to get the valley pan to fit right .