|
Re: How much can you deck a 440
[Re: BPBP440]
#1801836
04/12/15 06:37 PM
04/12/15 06:37 PM
|
Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
MoparBilly
master
|
master
Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
|
If it's a street cruiser, why worry about a chamfer at the top of the bore??
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
|
|
|
Re: How much can you deck a 440
[Re: Twostick]
#1801960
04/12/15 09:36 PM
04/12/15 09:36 PM
|
Joined: Nov 2012
Posts: 264
Farmington Hills, MI
BPBP440
OP
enthusiast
|
OP
enthusiast
Joined: Nov 2012
Posts: 264
Farmington Hills, MI
|
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 Thanks
|
|
|
Re: How much can you deck a 440
[Re: Stanton]
#1801976
04/12/15 09:47 PM
04/12/15 09:47 PM
|
Joined: Nov 2012
Posts: 264
Farmington Hills, MI
BPBP440
OP
enthusiast
|
OP
enthusiast
Joined: Nov 2012
Posts: 264
Farmington Hills, MI
|
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.
|
|
|
Re: How much can you deck a 440
[Re: BPBP440]
#1802112
04/13/15 12:13 AM
04/13/15 12:13 AM
|
Joined: Oct 2005
Posts: 8,887
Ontario, Canada
Stanton
Don't question me!
|
Don't question me!
Joined: Oct 2005
Posts: 8,887
Ontario, Canada
|
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. Well, its probably not perfectly perpendicular to the lifter bore in a big block but regardless, any amount of decking would not have any significant affect. You would have more of an impact by changing the rocker ratio !!
|
|
|
Re: How much can you deck a 440
[Re: BPBP440]
#1802704
04/13/15 09:42 PM
04/13/15 09:42 PM
|
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
Chris2581
master
|
master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
|
.006 to square up my 73 440 block
Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
|
|
|
Re: How much can you deck a 440
[Re: BPBP440]
#1802857
04/13/15 11:32 PM
04/13/15 11:32 PM
|
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
|
master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
|
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. As far as how far you can go before you have to cut the intake or the intake side of the manifold, ive gone as far as .040. Even with that you might have to drill out your intake bolt holes a little, and do some port match up adjustments.
73 Sport 440, 509 cam w/Eddys 3.91 and 28.1"/27.3 tire. Et. 60 ft. 1.435, 1/8th. 6.61 @ 101.80 mph. 1/4. 10.472 / 127.78 mph. 2950# race/with me,and pump gas.
|
|
|
Re: How much can you deck a 440
[Re: BPBP440]
#1802960
04/14/15 12:46 AM
04/14/15 12:46 AM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
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 
|
|
|
Re: How much can you deck a 440
[Re: MR_P_BODY]
#1802974
04/14/15 01:12 AM
04/14/15 01:12 AM
|
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
|
master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
|
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.
73 Sport 440, 509 cam w/Eddys 3.91 and 28.1"/27.3 tire. Et. 60 ft. 1.435, 1/8th. 6.61 @ 101.80 mph. 1/4. 10.472 / 127.78 mph. 2950# race/with me,and pump gas.
|
|
|
Re: How much can you deck a 440
[Re: quickd100]
#1803935
04/15/15 02:32 AM
04/15/15 02:32 AM
|
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
|
Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
|
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 Curious to see how that ends up sealing/working. How much did it all run (for the EXTRA machining, read: not the decking, but the extra 1/8" ov decking, extra milling etc.)? Enough to warrant not going with custom pistons (in someone else's case lets say).
|
|
|
|
|
