427 shortblock?

JSH · 10-30-2023, 11:59 AM

It looks like my thrust bearing is giving up the ghost.

I've always said that if I pull the engine again, I'll do a 427. So I will.

My plan has been to use my current valve train and heads, but the thought occurred to me that I probably need to change the cam too. Although my current cam works well, it's designed for something other than my current build and certainly not for a 427.

Thoughts?

Nimair.ZL1 · 10-30-2023, 12:10 PM

Quote:

Originally Posted by JSH

It looks like my thrust bearing is giving up the ghost.

I've always said that if I pull the engine again, I'll do a 427. So I will.

My plan has been to use my current valve train and heads, but the thought occurred to me that I probably need to change the cam too. Although my current cam works well, it's designed for something other than my current build and certainly not for a 427.

Thoughts?

You'll want a bigger cam. It really depends on what your setup is and what it will look like (boost only, nitrous, e85 and meth, 93 etc.) The small details will matter. There's a shop called ultimate engine solutions here in Texas that makes the baddest 427 engines at a really good price. If you'd like you can PM me and I'll give you the machine shop owners number. Just tell him Nimair sent you and he will take care of you. This is the same shop that built Justin Whites engine and you know how that car moves

JSH · 10-30-2023, 03:33 PM

Quote:

Originally Posted by Nimair.ZL1

You'll want a bigger cam. It really depends on what your setup is and what it will look like (boost only, nitrous, e85 and meth, 93 etc.) The small details will matter. There's a shop called ultimate engine solutions here in Texas that makes the baddest 427 engines at a really good price. If you'd like you can PM me and I'll give you the machine shop owners number. Just tell him Nimair sent you and he will take care of you. This is the same shop that built Justin Whites engine and you know how that car moves

Sure, send me the name and number thanks

Nimair.ZL1 · 10-30-2023, 03:40 PM

Quote:

Originally Posted by JSH

Sure, send me the name and number thanks

I sent you the contact information in your messages

Smokin19 · 10-31-2023, 06:53 AM

I liked the LS7 I last had in my 15' Z/28. Was built by Vengeance but, my current built Z would eat it.

*radz28* · 10-31-2023, 07:19 AM

I, still, think it was the cam that's been holding you back... It's not surprising it was the thrust bearing. I've seen many shops say that they wouldn't push the OEM short block past where you were (no offense or anything, of course). Did you say your blower went to sheet, too? Do you know what happened there? I'm just curious.

I know more displacement will give you more power, but I've seen some serious builds, that were stupid fast, go with less displacement, and go for more revs', with all the valve train goodies. Super stiff pushrods, shaft rockers, solid roller, Ti/Iconel, etc. I'm certainly no expert, and I know you've had some stupid-fast cars, so I'm not saying anything you don't already know.

I'm sorry for the complications, but am rooting for you, and excited to see what you come out with.

JSH · 10-31-2023, 08:41 AM

Thanks for your input.

Quote:

Originally Posted by radz28

I, still, think it was the cam that's been holding you back --- Agreed, as of today, I'll do a new short block and cam.

It's not surprising it was the thrust bearing. Yea, I was warned.

Did you say your blower went to sheet, too? The blower is fine.

I know more displacement will give you more power, There's no replacement for displacement. In my case, more cid will allow me to spin the blower and engine slower and still make a little more power.

Katech_Mike · 10-31-2023, 08:46 AM

We have 416ci shortblocks in stock and can build 427ci shortblocks in roughly 4 weeks.

Let me know if you need anything!

JSH · 10-31-2023, 09:08 AM

Quote:

Originally Posted by Katech_Mike

We have 416ci shortblocks in stock and can build 427ci shortblocks in roughly 4 weeks.

Let me know if you need anything!

416 would work too. I'll email you

jlaudio11 · 10-31-2023, 09:20 AM

Can your chassis & suspension handle more torque? The bigger the bore, the less head gasket surface area to hold boost in. What are you goals with the engine or what are you hoping to gain? If you "just want a 427" that's cool too, just keep in mind both the positives and negatives that will come with it.

KingLT1 · 10-31-2023, 10:04 AM

Quote:

Originally Posted by jlaudio11

Can your chassis & suspension handle more torque? The bigger the bore, the less head gasket surface area to hold boost in. What are you goals with the engine or what are you hoping to gain? If you "just want a 427" that's cool too, just keep in mind both the positives and negatives that will come with it.

Right but we have to consider his elevation. a 427 would only need 15-16psi to make 1000 instead of the 22psi he was pushing. 427 @ 15-16psi with the right cam might actually be more useable than his SBE with the 2650 being way overspun and making 980wtq @ 2800 rpm. He was making 21-22psi @ over 7k DA. That would probably be 25+ at sea level. Hence why the thrust bearing let go.

Normally I wouldn't advise going bigger cubes but in this case it might be the way to go since he was maxing out the Eddie 2650 at his elevation. He really needs a bigger supercharger for that altitude or a bigger motor and less boost. Jm2c...

jlaudio11 · 10-31-2023, 10:18 AM

Quote:

Originally Posted by KingLT1

Right but we have to consider his elevation. a 427 would only need 15-16psi to make 1000 instead of the 22psi he was pushing. 427 @ 15-16psi with the right cam might actually be more useable than his SBE with the 2650 being way overspun and making 980wtq @ 2800 rpm. He was making 21-22psi @ over 7k DA. That would probably be 25+ at sea level. Hence why the thrust bearing let go.

Normally I wouldn't advise going bigger cubes but in this case it might be the way to go since he was maxing out the Eddie 2650 at his elevation. He really needs a bigger supercharger for that altitude or a bigger motor and less boost. Jm2c...

That is some very solid reasoning that I hadn't taken into account! Now ya got me thinking on the best way to go about something setup for that situation. Maybe a bump in compression to help make the most of what its got, hmm.

JSH · 10-31-2023, 10:33 AM

Quote:

Originally Posted by KingLT1

Right but we have to consider his elevation. a 427 would only need 15-16psi to make 1000 instead of the 22psi he was pushing. 427 @ 15-16psi with the right cam might actually be more useable than his SBE with the 2650 being way overspun and making 980wtq @ 2800 rpm. He was making 21-22psi @ over 7k DA. That would probably be 25+ at sea level. Hence why the thrust bearing let go.

Normally I wouldn't advise going bigger cubes but in this case it might be the way to go since he was maxing out the Eddie 2650 at his elevation. He really needs a bigger supercharger for that altitude or a bigger motor and less boost. Jm2c...

The additional cubic inches is the way to go up here as I found out with my Sonny's 740 engine which was much more consistent than the smaller engines I competed against and here it makes sense because as King says I can put a 3-in pulley back on the supercharger. Slow it down to say 17,000 RPMs, shift the motor at say 6500 RPMs and make the same or more power plus having the primary benefit of a built bottom end

JSH · 10-31-2023, 05:23 PM

Quote:

Originally Posted by KingLT1

Right but we have to consider his elevation... He really needs a bigger supercharger for that altitude or a bigger motor and less boost. Jm2c...

Do you think I've got enough injector and fuel pump for a 416 making 100-110% of current build, XDI 30+, Dsx LS 80#, HPFP delivery duration <93°

10-30-2023, 11:59 AM	#1
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 3,562	427 shortblock? It looks like my thrust bearing is giving up the ghost. I've always said that if I pull the engine again, I'll do a 427. So I will. My plan has been to use my current valve train and heads, but the thought occurred to me that I probably need to change the cam too. Although my current cam works well, it's designed for something other than my current build and certainly not for a 427. Thoughts? __________________ '20 ZL1 1LE A10, OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.

10-31-2023, 06:53 AM	#5
Smokin19 Drives: 19' ZL1 A10, w/pdr Join Date: Sep 2014 Location: S.W. ohio Posts: 1,555	I liked the LS7 I last had in my 15' Z/28. Was built by Vengeance but, my current built Z would eat it. __________________ BTR Stg II cam w/ 38% fuel lobe, ARH 2" headers into 3" w/cats, AWE Touring, Kong X port, Weapon X triple ht exchangers, NW 103, Rotofab big gulp, DSX lowside, TCM tune, BMR Lockout, Mustang dyno 720 rwhp, 634 rwtq on 93 pump.

10-31-2023, 07:19 AM	#6
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,201 View My Garage	I, still, think it was the cam that's been holding you back... It's not surprising it was the thrust bearing. I've seen many shops say that they wouldn't push the OEM short block past where you were (no offense or anything, of course). Did you say your blower went to sheet, too? Do you know what happened there? I'm just curious. I know more displacement will give you more power, but I've seen some serious builds, that were stupid fast, go with less displacement, and go for more revs', with all the valve train goodies. Super stiff pushrods, shaft rockers, solid roller, Ti/Iconel, etc. I'm certainly no expert, and I know you've had some stupid-fast cars, so I'm not saying anything you don't already know. I'm sorry for the complications, but am rooting for you, and excited to see what you come out with. __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

10-31-2023, 09:20 AM	#10
jlaudio11 Drives: Chevy Camaro Join Date: Sep 2022 Location: IN Posts: 193	Can your chassis & suspension handle more torque? The bigger the bore, the less head gasket surface area to hold boost in. What are you goals with the engine or what are you hoping to gain? If you "just want a 427" that's cool too, just keep in mind both the positives and negatives that will come with it. __________________ '20 Camaro LT1 Twin 67/62 turbo 401(L8t) Texas speed forged piston & rod, BTR stg1 turbo cam, holley ultra lo, port injection, circle d 3600 stall, hoosier bias ply quick time pro's on racestar recluse wheels 1.45 4.01 6.07@120.74 9.28@153.43 '94 Camaro Z28 6mt cc306 cam, 4:10's, longtubes with x pipe, getting an engine rebuild

10-31-2023, 08:46 AM	#8
Katech_Mike Drives: 2015 Camaro ZL1 Join Date: Oct 2020 Location: Clinton Twp, Michigan Posts: 249	We have 416ci shortblocks in stock and can build 427ci shortblocks in roughly 4 weeks. Let me know if you need anything!

User Name		Remember Me?
Password