Coast High Performance is a good place to look. The KB forged pistons are supposed to be good quality but you might want to call them because I was gonna build a P-51 headed deal and the pistons even though stock stroke used a 6.8 inch rod which is an oddball with the Ford 2.5 inch rod journal but to my surprise there are a couple companies that do make them. I believe it was Scat and Eagle that make them. There is always custom rods but the prices are very high for them.
WHAT RODS AND PISTONS?
looking for a set of forged lightweight .040 over and h-beam rods (stock stroke)
anyone knoe where there are good deals?
are keith black forged pistons any good?
looking at building a decent 460 with a 200 shot of nitrous.
street/strip car pump gas c/r
anyone knoe where there are good deals?
are keith black forged pistons any good?
looking at building a decent 460 with a 200 shot of nitrous.
street/strip car pump gas c/r
1 - 18 of 18 Posts
Have your stock 460 crankshaft "offset" ground to a 2.200" rod journal and 4.050" stroke.
use a 6.700" I beam SCAT rod.
.040" oversize pistons is your major snafu as most companies make only .030" and .080" oversizes. Using the KB forged piston number KB856.040, with that stroke and that rod will get you where you want to be.
EDIT: It'll be a mild stroker at 493 cubic inches with 10.9/1 compression ratio and re-balancing will be necessary; (as with any NON-production assembly).
use a 6.700" I beam SCAT rod.
.040" oversize pistons is your major snafu as most companies make only .030" and .080" oversizes. Using the KB forged piston number KB856.040, with that stroke and that rod will get you where you want to be.
EDIT: It'll be a mild stroker at 493 cubic inches with 10.9/1 compression ratio and re-balancing will be necessary; (as with any NON-production assembly).
Wait, wait, wait... now I'm no expert, but I always hear about offset grinding to get 0.3" out of the stroke... but wouldn't it add 0.3" to the throw, not the stroke? Think about it... the center line is 0.3" further from the main center line than it was, adding 0.3" to the throw, or 0.6" to the stroke.... So wouldn't you essentially be able to get about a 4.45" stroke from a 460 crank, and all the way up to a 4.9" stroke from an A514 crank? (In other words a 4.75" stroke because I hear that's the biggest you can go.) So with under $400 for the crank and however much the offset grinding will cost you could have a 4.75" crank for 567 cubes without boring the engine at all... Maybe I'm wrong here, but that would be pretty cool. Not to mention, get yourself some 6.8" rods then get pistons designed for a BBC with 6.7" rods (BBCs have a 10.2" tall deck height, BBFs have 10.3", the 6.7 pistons with 6.8 rods fill the gap), then you'd have your whole rotating assembly from mostly shelf parts.. sounds like a good deal to me.Have your stock 460 crankshaft "offset" ground to a 2.200" rod journal and 4.050" stroke.
use a 6.700" I beam SCAT rod.
journal centerline IS the number you go by, but it moves half the amount.Wait, wait, wait... now I'm no expert, but I always hear about offset grinding to get 0.3" out of the stroke... but wouldn't it add 0.3" to the throw, not the stroke? Think about it... the center line is 0.3" further from the main center line than it was, adding 0.3" to the throw, or 0.6" to the stroke.... So wouldn't you essentially be able to get about a 4.45" stroke from a 460 crank, and all the way up to a 4.9" stroke from an A514 crank? (In other words a 4.75" stroke because I hear that's the biggest you can go.) So with under $400 for the crank and however much the offset grinding will cost you could have a 4.75" crank for 567 cubes without boring the engine at all... Maybe I'm wrong here, but that would be pretty cool. Not to mention, get yourself some 6.8" rods then get pistons designed for a BBC with 6.7" rods (BBCs have a 10.2" tall deck height, BBFs have 10.3", the 6.7 pistons with 6.8 rods fill the gap), then you'd have your whole rotating assembly from mostly shelf parts.. sounds like a good deal to me.
I/E .15+.15
I don't understand, why couldn't you move it .3"? If the Ford journal is 2.5" and the Chevy 2.2" then you have a .3" difference, in other words you can grind it up to .3" from the crank center line and get .3+.3... I must be missing something here...journal centerline IS the number you go by, but it moves half the amount.
I/E .15+.15
yes.I don't understand, why couldn't you move it .3"? If the Ford journal is 2.5" and the Chevy 2.2" then you have a .3" difference, in other words you can grind it up to .3" from the crank center line and get .3+.3... I must be missing something here...
you are grinding .3 from one (side) the actual centerline moves half that distance.
eg)
half of 10 is 5
if you subtract 3 from 10, the answer is 7
half of that is now 3.5, (which is 1.5 less than 5)
the centerline moves half the amount of the total amount removed.
thats the best example i could think of off the top of my head.
These drawings might explain it a little easier
http://home.earthlink.net/~highflowdynamics/highflowdynamicstechnicalpages/id3.html
http://home.earthlink.net/~highflowdynamics/highflowdynamicstechnicalpages/id3.html
Oh, now I get it. Thanks a lot.
Production big block Chevy's have a 9.8 deck. The aftermarket stuff has 10.2 (only the "tall deck" 427 truck motor has 10.2 from the factory).
All the big truck commercial chebby engines are tall deck including the 366/427/454...Production big block Chevy's have a 9.8 deck. The aftermarket stuff has 10.2 (only the "tall deck" 427 truck motor has 10.2 from the factory).
Steve
If you willing to go .060 over Probe has a few nice pistons for a 460. The icon pistons are decent too, but personal preference is Probe. SCAT is best bet for an H-beam 460 rod as far as china stuff goes...looking for a set of forged lightweight .040 over and h-beam rods (stock stroke)
anyone knoe where there are good deals?
are keith black forged pistons any good?
looking at building a decent 460 with a 200 shot of nitrous.
street/strip car pump gas c/r
Steve
No 454's use the tall deck height, they are all passenger car based engines.
At long last, KB has released the standard stroke pistons with the common 1.040" pin location the IC635 (flat top) and the IC636 (15cc step dish). They may be uised with an OEM spec crankshaft and con rods.The KB forged pistons are supposed to be good quality but ... the pistons even though stock stroke used a 6.8 inch rod which is an oddball with the Ford 2.5 inch rod journal...
Paul
I have a 460 bored 30 over and a eagle stroker crank in it 4300.. 2200 with Chevy 454 6.7rods and 4.3 stroke what pistons do I need I'm clue less only thing I could find is dodge 440 big block pistons it's bore is same and it has 2.2big end jurnals with 0.990 pins
I have a 460 bored 30 over and a eagle stroker crank in it 4300.. 2200 with Chevy 454 6.7rods and 4.3 stroke what pistons do I need I'm clue less only thing I could find is dodge 440 big block pistons it's bore is same and it has 2.2big end jurnals with 0.990 pins
Are you certain it is a 4.3" stroker crank?
The 6.7" rods are typically used with the 4.5" stroke crank.
Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
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Parkland Auto Machine
Ya it says right on it 4.300 2.200 460 I ordered a slandered crank and this is what I got so I was just going to roll with it lol
Ya it says right on it 4.300 2.200 460 I ordered a slandered crank and this is what I got so I was just going to roll with it lol
Purchase 6.8" rods and shelf pistons are everywhere.
Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
1 - 18 of 18 Posts
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