Original Engine Components
Thread Starter
Instructor
Joined: Sep 2017
Posts: 134
Likes: 6
From: Noblesville Indiana
Thank you everyone for your input! A few things, this car would not be getting judged,and I'm not concerned with "numbers matching." I can see pros and cons from both sides here. I don't own anything modern performance, so here's my big question, the performance SBC and BBC engines back in the day all had such unique sounds, would a modern 427 sound the same (assuming it's cammed the same way etc etc) as one that was built back then? I'm sorry if this sounds ignorant or is a stupid question...but you guys are the experts!
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,180
Likes: 9,310
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
With a roller cam the lope would be different due to the ramps and LSA.
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
Keep the block, throw away everything else, build motor with modern components crank, rods, pistons, heads.
how much hp.? depends how much you spend on components.
minimum investment in parts for quality components around 5k depending on hp.
how much hp.? depends how much you spend on components.
minimum investment in parts for quality components around 5k depending on hp.
Had a 1976 L-82, 4-sp
Joined: Mar 2011
Posts: 5,338
Likes: 1,213
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Auto engineers spend a lot of time perfecting exhaust sound these days. Are they driven by old school exhaust sounds? Of course they are! So build old school and have the sound everybody wants these days out of a modern performance car.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I'll add that finding pistons for a 427 is difficult too- for some reason all the piston guys have 83 varieties for a 454 and -0- for a 427.. They'll custom make them, but bring your checkbook.
$2k will get you a balanced 496 rotating assembly- crank rods,pistons, bearings and rings. And from the outside, nobody can tell.
$2k will get you a balanced 496 rotating assembly- crank rods,pistons, bearings and rings. And from the outside, nobody can tell.
Melting Slicks
Joined: May 2009
Posts: 3,079
Likes: 314
2024 C3 of the Year Finalist - Unmodified
so here's my big question, the performance SBC and BBC engines back in the day all had such unique sounds, would a modern 427 sound the same (assuming it's cammed the same way etc etc) as one that was built back then? I'm sorry if this sounds ignorant or is a stupid question...but you guys are the experts!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Firm believer that compression motors work; get the cam profile right it will sound "right" especially at higher rpm
Add a solid lifter cam its pure music....gets that diesel like sound in the interior. not enough compression and a lumpy cam just sounds..lazy
Talk to a local builder you trust, sit down and plan. I wouldnt go out of your way to sink money into 50+ yr old parts.
Add a solid lifter cam its pure music....gets that diesel like sound in the interior. not enough compression and a lumpy cam just sounds..lazy
Talk to a local builder you trust, sit down and plan. I wouldnt go out of your way to sink money into 50+ yr old parts.
Burning Brakes
Joined: Oct 2012
Posts: 1,152
Likes: 252
Mazda has been running 13:1 static with their SkyActive engines for a few years now. Accomplished through direct injection, piston shape and cam profile. I read the next generation due out next year is going 16:1 CR. In their application the high CR doesn't produce any more power than a contemporary 10:1 CR engine, but it does improve fuel economy substantially.
Last edited by Dynra Rockets; Jul 28, 2018 at 09:33 AM.
Administrator
Joined: Jul 2000
Posts: 53,980
Likes: 6,207
From: About 1100 miles from where I call home.
Hey everybody,
As some of you know, I'm in the middle of a 75 restore, so this isn't anything that will be happening soon, but I am curious.
My dream car is a 69 black/red L88. Unfortunately, they're few and far between and will be even more so when I have the means to get one.
So I've been thinking, there are plenty of original 427 69s...if I had one of those, could I put the components used in the L88 into say an L36, L68, or L71 block and essentially "clone" the L88 engine?
If so, where can I find the data on the components they used? And is there somewhere I can buy them individually?
Any suggestions or help would be greatly appreciated!
Riley
As some of you know, I'm in the middle of a 75 restore, so this isn't anything that will be happening soon, but I am curious.
My dream car is a 69 black/red L88. Unfortunately, they're few and far between and will be even more so when I have the means to get one.
So I've been thinking, there are plenty of original 427 69s...if I had one of those, could I put the components used in the L88 into say an L36, L68, or L71 block and essentially "clone" the L88 engine?
If so, where can I find the data on the components they used? And is there somewhere I can buy them individually?
Any suggestions or help would be greatly appreciated!
Riley
Administrator
Joined: Jul 2000
Posts: 53,980
Likes: 6,207
From: About 1100 miles from where I call home.
Team Owner
Joined: Jan 2008
Posts: 30,894
Likes: 1,189
From: chicago
Hey everybody,
As some of you know, I'm in the middle of a 75 restore, so this isn't anything that will be happening soon, but I am curious.
My dream car is a 69 black/red L88. Unfortunately, they're few and far between and will be even more so when I have the means to get one.
So I've been thinking, there are plenty of original 427 69s...if I had one of those, could I put the components used in the L88 into say an L36, L68, or L71 block and essentially "clone" the L88 engine?
If so, where can I find the data on the components they used? And is there somewhere I can buy them individually?
Any suggestions or help would be greatly appreciated!
Riley
As some of you know, I'm in the middle of a 75 restore, so this isn't anything that will be happening soon, but I am curious.
My dream car is a 69 black/red L88. Unfortunately, they're few and far between and will be even more so when I have the means to get one.
So I've been thinking, there are plenty of original 427 69s...if I had one of those, could I put the components used in the L88 into say an L36, L68, or L71 block and essentially "clone" the L88 engine?
If so, where can I find the data on the components they used? And is there somewhere I can buy them individually?
Any suggestions or help would be greatly appreciated!
Riley