510cid small block
TECH Enthusiast
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It's not that expensive.
454ci: cam in the low 240's, .630 lift, 12:1 cr
$2,800 LSX iron block, ARP studs with a 4.185 bore
$3,500 Forged crank (4.125), rods, pistons
$3,000 Complete hand ported LS7 heads that flow (~400@.650 lift...270+ exh)
$4,000 Sheet metal intake, 105mm TB
$1,000 Gaskets and misc stuff
$500 SD tune
If you want a BS3 computer go for it, but not necassary.
Close to, if not 700 RWHP (M6) right there. Add a direct port 300 shot for a 1,000 RWHP killer.
C6 Z06's are doing 620 RWHP with 240 sized cams with around .630 lift. BUT...with the cheezy "by comparison" LS7 intake. With 27 more cubes than the 427 Z06 engine, a cam matched to the sheet metal intake and 12:1 cr....700 RWHP on pump gas should be easy (M6).
454ci: cam in the low 240's, .630 lift, 12:1 cr
$2,800 LSX iron block, ARP studs with a 4.185 bore
$3,500 Forged crank (4.125), rods, pistons
$3,000 Complete hand ported LS7 heads that flow (~400@.650 lift...270+ exh)
$4,000 Sheet metal intake, 105mm TB
$1,000 Gaskets and misc stuff
$500 SD tune
If you want a BS3 computer go for it, but not necassary.
Close to, if not 700 RWHP (M6) right there. Add a direct port 300 shot for a 1,000 RWHP killer.
C6 Z06's are doing 620 RWHP with 240 sized cams with around .630 lift. BUT...with the cheezy "by comparison" LS7 intake. With 27 more cubes than the 427 Z06 engine, a cam matched to the sheet metal intake and 12:1 cr....700 RWHP on pump gas should be easy (M6).
It's not that expensive.
454ci: cam in the low 240's, .630 lift, 12:1 cr
$2,800 LSX iron block, ARP studs with a 4.185 bore
$3,500 Forged crank (4.125), rods, pistons
$3,000 Complete hand ported LS7 heads that flow (~400@.650 lift...270+ exh)
$4,000 Sheet metal intake, 105mm TB
$1,000 Gaskets and misc stuff
$500 SD tune
If you want a BS3 computer go for it, but not necassary.
Close to, if not 700 RWHP (M6) right there. Add a direct port 300 shot for a 1,000 RWHP killer.
C6 Z06's are doing 620 RWHP with 240 sized cams with around .630 lift. BUT...with the cheezy "by comparison" LS7 intake. With 27 more cubes than the 427 Z06 engine, a cam matched to the sheet metal intake and 12:1 cr....700 RWHP on pump gas should be easy (M6).
454ci: cam in the low 240's, .630 lift, 12:1 cr
$2,800 LSX iron block, ARP studs with a 4.185 bore
$3,500 Forged crank (4.125), rods, pistons
$3,000 Complete hand ported LS7 heads that flow (~400@.650 lift...270+ exh)
$4,000 Sheet metal intake, 105mm TB
$1,000 Gaskets and misc stuff
$500 SD tune
If you want a BS3 computer go for it, but not necassary.
Close to, if not 700 RWHP (M6) right there. Add a direct port 300 shot for a 1,000 RWHP killer.
C6 Z06's are doing 620 RWHP with 240 sized cams with around .630 lift. BUT...with the cheezy "by comparison" LS7 intake. With 27 more cubes than the 427 Z06 engine, a cam matched to the sheet metal intake and 12:1 cr....700 RWHP on pump gas should be easy (M6).
You werent paying attention..LOL
supporting a 4.5" stroke even on is going to leave next to nothing for a ringland,
My short block is $6234.. balanced, blue printed ready for your heads.
High Performance Pontiacs say...
What is needed is a block that can be safely bored to 4.250 without getting major cylinder wall deflection, and it must have a rigid, thick deck with extra head bolts to hold the cylinder pressures required to reach over 2,000 hp. The real dream is to be able to do this at an affordable price. GM Performance Parts has now stepped up to the plate with a big bat, but will it be a home run?
L92 heads would work fine for this, and I have heard of people using the LS7 or F.A.S.T. intake. The stroke on the other hand, I would be worried about. I would think if someone is promoting there product saying it can be built up to 510 CI, I would say it's possible.
What is needed is a block that can be safely bored to 4.250 without getting major cylinder wall deflection, and it must have a rigid, thick deck with extra head bolts to hold the cylinder pressures required to reach over 2,000 hp. The real dream is to be able to do this at an affordable price. GM Performance Parts has now stepped up to the plate with a big bat, but will it be a home run?
L92 heads would work fine for this, and I have heard of people using the LS7 or F.A.S.T. intake. The stroke on the other hand, I would be worried about. I would think if someone is promoting there product saying it can be built up to 510 CI, I would say it's possible.
TECH Enthusiast
Joined: Jan 2008
Posts: 625
Likes: 0
TECH Enthusiast
Joined: Jan 2008
Posts: 625
Likes: 0
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has anyone even broke the 700whp mark??????? much less 750??????
a 454 is a long way from a 500+ci
Just because the material might be sttong enough to hold the power the rest of the components might not, with increased cylinder pressure you need increased clamping force and strength. You will not have enough gasket between the cylinders to keep it together.
Have you ever priced out what it takes to make a NA motor or even a nitrous motor live at 1000hp? How often bearings, rings and pistons need to be replaced?
Do you know how far up the piston the pin will be pushed with a 4.125 stroke and how little of a ringland you will have? All you will have is a ticking timebomb that will grenade itself.
it's not as simple or cheap as you think, just ask anyone who has tried. if it was everyone would have a 8 second car.
a 454 is a long way from a 500+ci
Just because the material might be sttong enough to hold the power the rest of the components might not, with increased cylinder pressure you need increased clamping force and strength. You will not have enough gasket between the cylinders to keep it together.
Have you ever priced out what it takes to make a NA motor or even a nitrous motor live at 1000hp? How often bearings, rings and pistons need to be replaced?
Do you know how far up the piston the pin will be pushed with a 4.125 stroke and how little of a ringland you will have? All you will have is a ticking timebomb that will grenade itself.
it's not as simple or cheap as you think, just ask anyone who has tried. if it was everyone would have a 8 second car.
Guys, it is all relative. 720 hp on the Engine dyno with a 500" LS2 block with sleeves/deck plates from ERL.
250/255 @ .050" Hydraulic roller. Cleaned up LS7 heads AND LS7 Intake.
93 Octane too.
250/255 @ .050" Hydraulic roller. Cleaned up LS7 heads AND LS7 Intake.
93 Octane too.
It idles fairly well and was tuned on a GM factory ECU.
Definitely a lot of room to make this motor WAY more serious than where it is at.
With that long stroke, piston speed would seem to be worrisome but turning the motor up to 6500 rpm resulted with no issues at all. Even hitting it with the N20 showed no signs of problems. After numerous pulls I might add.
It is in the Black Z28 and has good road manners even though it has a 3 speed in the car. Definitely is a runner.
Definitely a lot of room to make this motor WAY more serious than where it is at.
With that long stroke, piston speed would seem to be worrisome but turning the motor up to 6500 rpm resulted with no issues at all. Even hitting it with the N20 showed no signs of problems. After numerous pulls I might add.
It is in the Black Z28 and has good road manners even though it has a 3 speed in the car. Definitely is a runner.
And again its not the bore it's the stroke
Last edited by 99blancoSS; Jun 26, 2008 at 01:14 AM.
I'll post some pictures of a 12:1 454 that detonated. chunks of piston missing, engine wasnt very old at all
Last edited by 99blancoSS; Jun 26, 2008 at 01:12 AM.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
The bore isn't what people are worried about. It's the CH of the piston and what rings you can get in there and how far down you can run them. You need some top and second ring land to run really big NOS reliably. You could run a 500 shot easy on Steve's blocks with the right crank rods and pistons all day long. The pistons are what will go first not the block.
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I'm only talking 4.125 stroke in a GM LSX iron block, thats not too long for a big shot.
Steves resleeved LS2 block with the longer 5.800" sleeves is good if he wants to go longer stroke to get closer to 500ci. Its also fine to spray a 250 shot with a 4.185 bore with the resleeved LS2.
Steves resleeved LS2 block with the longer 5.800" sleeves is good if he wants to go longer stroke to get closer to 500ci. Its also fine to spray a 250 shot with a 4.185 bore with the resleeved LS2.
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Another blah, blah, blah thread I guess.