417 vs 427 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

1709 · 09-12-2014, 08:55 PM

I have a zl1 Camaro with a lsa motor and want to know if there is much HP difference between a stroked 417 and a 427.

SuperchargedStealth · 09-12-2014, 09:15 PM

One of the reasons that you see 416-418 is because the stock aluminum block is still used allowing it to be pushed more. When you go to a 427 on a STOCK aluminum block, the cylinder walls become too thin for high boost. If you go with a 427, either use a LSX block which is aluminum, or get a properly built aluminum block that has been resleeved. Both block that you mentioned can easily make big power, but unless it's built and tuned right, it may not last. I chose to do a 427 because to me it just sounds better and rolls off the tongue more easily. Knowing about a GM LS7, and the power goal I had in mind, I chose to use the LSX block.

1709 · 09-12-2014, 09:37 PM

I know you can not take a lsa block to a 427 I would use a ls7 block. what I want to know is there much power difference between the 417 and the 427.

SuperchargedStealth · 09-12-2014, 09:47 PM

Simply put no. It comes down to the power adders. Both can hold the same power and you can make the 6.2 into a 427. They are bored out to that size regardless if it's a LS3 or LSA.

Unreal · 09-12-2014, 10:29 PM

You wouldn't want to really boost a ls7 block either.

Power difference would be minimal at best. Not worth it.

2sscamaro11 · 09-12-2014, 10:40 PM

I think the lsx block is cast iron and weighs about 100lbs more than an aluminum block.

SuperchargedStealth · 09-12-2014, 11:06 PM

Quote:

Originally Posted by 2sscamaro11

I think the lsx block is cast iron and weighs about 100lbs more than an aluminum block.

That is correct. As strong as it can be it traps in a lot more heat.

sprayedv · 09-13-2014, 03:52 PM

434 LSX baby.

z06-tt · 09-15-2014, 09:50 AM

Quote:

Originally Posted by SuperchargedStealth

One of the reasons that you see 416-418 is because the stock aluminum block is still used allowing it to be pushed more. When you go to a 427 on a STOCK aluminum block, the cylinder walls become too thin for high boost. If you go with a 427, either use a LSX block which is aluminum, or get a properly built aluminum block that has been resleeved. Both block that you mentioned can easily make big power, but unless it's built and tuned right, it may not last. I chose to do a 427 because to me it just sounds better and rolls off the tongue more easily. Knowing about a GM LS7, and the power goal I had in mind, I chose to use the LSX block.

you can get a 427 out of a 6.2 block.... you just stroke it more. SDPC has been selling motors this way for years now... no need to bore it any more. ( now i dont recommend this for boost... but can be done with a 6.2 block )

Quote:

Originally Posted by sprayedv

434 LSX baby.

^^ over kill in a boost car... their is a reason some of the big players have even dropped below a 427... its not needed.

only thing a 427+ is good for is spooling up a T4 twin turbo setup. beyond that any size motor with the right setup will still make the same power.

id take a 4.125 bore with a stock 3.622 stroke..... and let the turbos do the work.

Unreal · 09-15-2014, 11:18 AM

Agreed, if he had turbos. I guess it depends on the power adder. If you are running a stock zl1 blower, I would stay stock cubes.

Big bore short stroke is an awesome combo.

BullF-16 · 09-15-2014, 11:52 AM

Quote:

Originally Posted by Unreal

Agreed, if he had turbos. I guess it depends on the power adder. If you are running a stock zl1 blower, I would stay stock cubes.

Big bore short stroke is an awesome combo.

Yes, he has two badass Comp oiless turbos and spray on top of that. Should easily be over 1400whp when all is said and done.

jessrayo · 09-15-2014, 09:54 PM

There is no replacement for displacement. It gives you more torque and more room for air and fuel. You can make more power with more displacement.

In reality you have to get pretty bat guano crazy with forced induction to be able to take advantage of all of those cubic inches. Unless you are talking the 4 liter Kenne Bell and Whipple blowers, you can run all of the top mount blowers flat out at max rpm on a 376 and get pretty close to the same air into a 376 as 434. Now if you go with the really big centry's or big turbos you can make more power with more displacement. Turbos like more displacement, it helps them spool faster and you have more power before they come into boost.

If you are talking specifically about the stock ZL1 motor I would not bore it to 427. 417 is as big as you should go on the stock block. If you are starting with a new, ERL, RHS, LSX... I would go 427.

z06-tt · 09-16-2014, 10:38 AM

Quote:

Originally Posted by jessrayo

There is no replacement for displacement. It gives you more torque and more room for air and fuel. You can make more power with more displacement.

In reality you have to get pretty bat guano crazy with forced induction to be able to take advantage of all of those cubic inches. Unless you are talking the 4 liter Kenne Bell and Whipple blowers, you can run all of the top mount blowers flat out at max rpm on a 376 and get pretty close to the same air into a 376 as 434. Now if you go with the really big centry's or big turbos you can make more power with more displacement. Turbos like more displacement, it helps them spool faster and you have more power before they come into boost. it also big cube help choke off a turbo quicker.. Every turbo bolt on kit on the market right now would work with a 434... but would work better with a 416. ( or smaller in as in the t3 turbo kit market. )

If you are talking specifically about the stock ZL1 motor I would not bore it to 427. 417 is as big as you should go on the stock block. If you are starting with a new, ERL, RHS, LSX... I would go 427.

this is true but when you can only fit SO big of turbos...

then the big motor is really just a waste..

sprayedv · 09-16-2014, 11:14 AM

Well my 434 just made 903whp at 10.5psi lol. I'd say <3 434s.

09-12-2014, 08:55 PM	#1
1709 9.56@144.09 Drives: 2013 zl1 black Join Date: Mar 2013 Location: dawson creek Posts: 272	417 vs 427 I have a zl1 Camaro with a lsa motor and want to know if there is much HP difference between a stroked 417 and a 427.

09-12-2014, 09:15 PM	#2
SuperchargedStealth Drives: '11 Camaro Supercharged Convertible Join Date: May 2014 Location: NJ Posts: 481	One of the reasons that you see 416-418 is because the stock aluminum block is still used allowing it to be pushed more. When you go to a 427 on a STOCK aluminum block, the cylinder walls become too thin for high boost. If you go with a 427, either use a LSX block which is aluminum, or get a properly built aluminum block that has been resleeved. Both block that you mentioned can easily make big power, but unless it's built and tuned right, it may not last. I chose to do a 427 because to me it just sounds better and rolls off the tongue more easily. Knowing about a GM LS7, and the power goal I had in mind, I chose to use the LSX block. __________________ 2011 Triple Black SS convertible, LSX 427, PRC 260cc heads, Callies Ultra Billet Rods, Wiseco -20 cc piston, Callies Dragon Slayer crank, Strange Dana 60 rear w/3.73 gear ratio and driveshaft, Pfadt coilovers, Pfadt sway bars, Pfadt trailing arms, Pfadt tie rods, Pfadt subframe bushings, Vortech YSi with wastegate and twin BOV, Haltech ECU, Mantic 9000 Twin Clutch, ALKY control meth system with dual nozzle, Squash twin fuel pumps, ACS T3 ports, VIS Terminator Hood, Seibon ZL style lip.

09-12-2014, 09:47 PM	#4
SuperchargedStealth Drives: '11 Camaro Supercharged Convertible Join Date: May 2014 Location: NJ Posts: 481	Simply put no. It comes down to the power adders. Both can hold the same power and you can make the 6.2 into a 427. They are bored out to that size regardless if it's a LS3 or LSA. __________________ 2011 Triple Black SS convertible, LSX 427, PRC 260cc heads, Callies Ultra Billet Rods, Wiseco -20 cc piston, Callies Dragon Slayer crank, Strange Dana 60 rear w/3.73 gear ratio and driveshaft, Pfadt coilovers, Pfadt sway bars, Pfadt trailing arms, Pfadt tie rods, Pfadt subframe bushings, Vortech YSi with wastegate and twin BOV, Haltech ECU, Mantic 9000 Twin Clutch, ALKY control meth system with dual nozzle, Squash twin fuel pumps, ACS T3 ports, VIS Terminator Hood, Seibon ZL style lip.

09-12-2014, 10:29 PM	#5
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	You wouldn't want to really boost a ls7 block either. Power difference would be minimal at best. Not worth it. __________________ Nick Corvette Z06 -1200ish rwhp

09-13-2014, 03:52 PM	#8
sprayedv Drives: 2012 CTS-V, 2010 Camaro SS Join Date: Sep 2013 Location: Infront of you Posts: 281	434 LSX baby. __________________ 2012 CTS-V: Cosmetic Chute.

09-12-2014, 09:37 PM	#3
1709 9.56@144.09 Drives: 2013 zl1 black Join Date: Mar 2013 Location: dawson creek Posts: 272	I know you can not take a lsa block to a 427 I would use a ls7 block. what I want to know is there much power difference between the 417 and the 427.

09-12-2014, 10:40 PM	#6
2sscamaro11 Drives: 2011 ss camaro Join Date: Jan 2013 Location: hamburg pa Posts: 261	I think the lsx block is cast iron and weighs about 100lbs more than an aluminum block.

09-15-2014, 11:18 AM	#10
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Agreed, if he had turbos. I guess it depends on the power adder. If you are running a stock zl1 blower, I would stay stock cubes. Big bore short stroke is an awesome combo. __________________ Nick Corvette Z06 -1200ish rwhp

09-15-2014, 09:54 PM	#12
jessrayo Speed Freak Drives: 2013 ZL1 Camaro, 2016 Camaro SS Join Date: Jun 2013 Location: Ardmore, OK Posts: 2,637 View My Garage	There is no replacement for displacement. It gives you more torque and more room for air and fuel. You can make more power with more displacement. In reality you have to get pretty bat guano crazy with forced induction to be able to take advantage of all of those cubic inches. Unless you are talking the 4 liter Kenne Bell and Whipple blowers, you can run all of the top mount blowers flat out at max rpm on a 376 and get pretty close to the same air into a 376 as 434. Now if you go with the really big centry's or big turbos you can make more power with more displacement. Turbos like more displacement, it helps them spool faster and you have more power before they come into boost. If you are talking specifically about the stock ZL1 motor I would not bore it to 427. 417 is as big as you should go on the stock block. If you are starting with a new, ERL, RHS, LSX... I would go 427. __________________ 2016 SS -AGP twin Borg Warner 7163 EFR's, LT4 mechanical pump, LT4 injectors, Walbro 255 low side, Castrol SRF. 734whp/759 tq 2013 ZL1 -ADM - 427 LSX 6 bolt, O-ringed block built by LME. Twin PT6466 turbos. RPM custom manual trans, RPS Quad carbon clutch, 9" Hendrix rear diff & axles. ADM/squash fuel system, Ron Davis radiator, Spal fans, AGP air to air, turbo plumbing. LPE oil cooler, rear bushing upgrade, roll bar...etc. rwhp 1400+... 212.5mph, best Texas mile to date.

09-16-2014, 11:14 AM	#14
sprayedv Drives: 2012 CTS-V, 2010 Camaro SS Join Date: Sep 2013 Location: Infront of you Posts: 281	Well my 434 just made 903whp at 10.5psi lol. I'd say <3 434s. __________________ 2012 CTS-V: Cosmetic Chute.