400 HiPo pistons to stock specs engine

[Chryco Psycho]

Possibly it has been discontinued , it wasn`t last time when I last did this

[Challenger340]

Possibly it has been discontinued , it wasn`t last time when I last did this

Agreed, probably discontinued. Too bad, would have been interesting Option.
I was VERY hopeful, and even pulled out my old Speed Pro Performance catalog from 1989, to no avail.

So it seems, the only 440 Piston available from speed pro, that would fit in a low deck 400 block, is a CAST Rebuilder style Flat-top, no Valve reliefs, cheapo Piston @ 1.912" comp. Distance. Which also limits camshaft selection.
DARN IT !

I still think, for the money, the KB 240, is a viable option, on a non-Nitrous or Boost, pump gas, street application.
Especially when compared to "custom" Forged Pistons pricewise, as seems, is the only other option, so far.

Anybody ?

Anybody know of any others that might work, without going to "custom" Forged slugs ?

[Chryco Psycho]

Ok so I could not check to be sure the piston was still in production  on Christmas eve 

[Challenger340]

Ok so I could check to be sure the piston was still in production  on Christmas eve 

HUH ?

I appreciate you're even TRYING to come up with a part number Chryco, even from "memory" ?, on X-mas eve. Thank you !

I was just hopeful, because I have a "resto" type 400 magnum out of a 73 charger to Machine soon, and was interested also, in any options "other" than KB's, which seem to be about the only decent thing out there, except going "custom forged".

the low compression Speed Pro 440 piston is actually short enough to fit a 400 block & yeild good compression , I have done this before

It just peaked my interest, apologies if in any way, I've offended.
I also used have used "Speed Pro" type 440 Pistons many years ago in a 400 build.
The L2266F forged.
But I had to mill the flat-top down, AND, address Pin-boss issues to the counterweight, AND, cut Valve reliefs.
By the time I was done, it was NOT cost effective. But in "those days", there was nothing else as an option.

So it just 'peaked" my curiosity, if there was something I'm missing out there, as a better option, even on X-mas eve, to the KB's.

Thanks for the imput, even if it didn't work out. I certainly meant no offense to you.

[Nacho-RT74]

some math formula to calculate HPs based on compression, with cubic inches etc before get the parts bought and joined ? I have seen relation between RPMs, speed and HPs...

with an aproximatelly calculation will be enough since I know cam selection is also some to take on count. My friend is thinking on a Mopar Performance one for street/strip use
http://store.summitracing.com/partdetail.asp?part=DCC%2D4529318&N=700+400172+4294887637+4294887624+115&autoview=sku

even We have a later 70s stock cam shaft just in case he decide to install from a 400 donor

[Challenger340]

some math formula to calculate HPs based on compression, with cubic inches etc before get the parts bought and joined ? I have seen relation between RPMs, speed and HPs...

with an aproximatelly calculation will be enough since I know cam selection is also some to take on count. My friend is thinking on a Mopar Performance one for street/strip use
http://store.summitracing.com/partdetail.asp?part=DCC%2D4529318&N=700+400172+4294887637+4294887624+115&autoview=sku

even We have a later 70s stock cam shaft just in case he decide to install from a 400 donor

Nacho;
The link took me to a 272 duration @ .050 Hydraulic cam ? is that right ?
You'd best wait for Firefighter3931 to chime in here, on that selection. Get his opinion first, BEFORE you buy.

[Nacho-RT74]

yes... that's the one, Mopar performance Cam street/strip use

I don't know nothing about that so that's why I'm asking for opinions.

anyway, Hom much HPs we can expect with everything stock, metallic gasket and just the pistons... some mathematic formula with values I have ? ( volume, compresion ) at least aproximatelly

He is some crazy... he really needs BADDLY new springs an is thinking on engine performance... damn... what would you make with POWER if you can't handly it... whatever he ( we are ... I'm trying to get it controlled ) is trying to get 350-400 HPs rate on a street engine with extra power to some street race. DAMN HE IS FORGETING ALSO THE IGNITION SYSTEM... whatever, life will teach him.

[Challenger340]

In that link, is that a misprint ?

THAT CAM, has 272 degrees duration @ .050", with a lobe seperation angle of 104 degrees ! HOLY Cylinder scavenging batman ! Thats a ton of overlap ! A real "cheater" cam it appears. I'm thinking it'll be a real "pooper" down low rpm's, even with the tight lsa ?  Depends how much compression you have.

Anyways, THAT CAM will need new, NOT STOCK springs to accomodate the .533 lift, at the very least. As for the HP increase, too many variables to answer, for me anyway.
H.P. is a product of rpm, and, well, is the stock engine gonna "hang in there" at that rpm ? Even with the new Valve springs ?

I hope Firefighter3931 chimes in here, he'll have a valid opinion for you. All I can do is look, and scratch my bald melon ! LOL !