Just bought a zz427/480 gm perf. Engine - Chevelle Tech
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  #1  
Old Oct 25th, 11, 11:23 PM
Fishyo Fishyo is online now
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Default Just bought a zz427/480 gm perf. Engine

Greetings from Canada.

Had a few issues with the original L78 396 and decided to "park" it under the bench.

Pondered long and hard as to what I wanted to replace it with.
ZZ454, ZZ502, build a 468, buy a 468, buy a 496 etc.
Ended up going with the GM performance ZZ427.
This engine just looks like fun !!

I wanted something I could just drive the snot out of and not worry about hurting anything.
Then if sometime down the road I decide to get wild on it, I can easily make a 468 or 496 using a new (not 35 year old block) and have a factory roller set-up to boot.

And now for the GM propaganda:
There are few engines that conjure up images of greatness like the 427 Chevy big-block. New to the GM Performance Parts lineup, the ZZ427 big-block crate engine brings back all of the good things that you remember about the 427 with a few modern new upgrades. With an updated cast iron block, a 10.1:1 final compression ratio, and an aggressive hydraulic roller camshaft, the ZZ427 offers you outstanding performance while still living on low octane fuel.
The legendary 427\" big-block Chevy powered some of the most storied cars in the history of the high performance automobile.
This latest version holds true to that tradition, offering you a tough, 4-bolt main cast iron block with all a forged internal rotating assembly.
The top half of the engine is the same as the limited edition Anniversary 427 crate engine: oval-port heads that use 2.19\" intake and 1.88\" exhaust valves work with 1.7:1 aluminum roller rockers and a .510\" intake/.540\" exhaust camshaft.
The intake is a matching, high-flow oval-port aluminum piece that gets fed the air/fuel mix from a 870-cfm carburetor. An HEI distributor, aluminum water pump, spark plug wires, and a 14\" flexplate round out the package.
Internally balanced, the ZZ427 will spin to 6000 rpm before itís time for you to shift. The ZZ427 is an exciting trip back to one of the high points in the history of the Chevrolet big-block. With a conservative rating of 480 horsepower and loads of torque, itís still one of the best crate engines for just about any big-block application.

Matched to my KEISLER RS500 and all the giggles you can handle for under 9 grand.

Can't wait for spring !!
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  #2  
Old Oct 26th, 11, 12:17 AM
VinceS427bb VinceS427bb is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

should be great fun and cruising
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  #3  
Old Oct 26th, 11, 8:00 AM
GRN69CHV GRN69CHV is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

Did you install it yet? Kinda surprised GMPP advertises to spin it to 6000, typically, the factory big block hyd rollers were limited to lower rpm's. Be a pretty simple deal to swap in the ZZ502 cam while on the stand. Good luck with it, let us know how it runs once you get it all buttoned up.
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  #4  
Old Oct 26th, 11, 8:03 AM
dreis454 dreis454 is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

Post a video when its running....
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  #5  
Old Oct 26th, 11, 8:18 AM
Dan Orgill Dan Orgill is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

I'd be tempted to re-cam it as well....you may not want a 468 or 496 if you get that bad boy running really well.
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  #6  
Old Oct 26th, 11, 11:09 AM
badrad badrad is online now
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Default Re: Just bought a zz427/480 gm perf. Engine

You can get the ZZ502 cam for about $175 from Summit new, straight swap. I'd degree it though and probably get Crane lifters. They're not too pricey but better for high RPM.
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  #7  
Old Oct 26th, 11, 9:47 PM
Fishyo Fishyo is online now
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Default Re: Just bought a zz427/480 gm perf. Engine

Quote:
Originally Posted by dreis454 View Post
Post a video when its running....
Quote:
Originally Posted by Dan Orgill View Post
I'd be tempted to re-cam it as well....you may not want a 468 or 496 if you get that bad boy running really well.
Quote:
Originally Posted by badrad View Post
You can get the ZZ502 cam for about $175 from Summit new, straight swap. I'd degree it though and probably get Crane lifters. They're not too pricey but better for high RPM.
I will post a video (probably on the dyno).

I wont be recamming it.
Why would I want to crack open a brand new engine to change out the guts and void a warranty (however poor that warranty may be) ??
This is a street car and the reason I went with this engine is the HP/torque curve on this thing. This package looks like a blast to drive and ideally suited for a stick. Check out the torque curves...the ZZ502 cam wont spin like this thing will and stops making power at 5200. This thing pulls hard to 5800 before the curve starts to even think about going south.
This package just seems to be better suited for a street/weekend cruiser car (with a stick).
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IF YOU DIDN'T BUILD IT YOURSELF...
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68 Chevelle SS 396 (GMPP427) RS500 3.31
(YES IT'S FAST...NO, YOU CAN'T DRIVE IT)
TC# 4227
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  #8  
Old Oct 27th, 11, 5:37 AM
GRN69CHV GRN69CHV is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

Jim, I checked the GMPP catalog, description says it has the smaller 211/230, .510/.540 112LSA cam (same as the 454HO,502HO and ZZ454). Tech specs shows it having the larger 224/234, .527/.544, 110LSA cam from the ZZ502 motors. Tech specs also show it coming with the 770 carb rather than the 870. Which, be honest with you, I've ran both a 770 and an 870 prior, 770 was a better running carb. Can't explain why, it just was. Goodluck with it.
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  #9  
Old Oct 27th, 11, 6:36 AM
Keith Tedford Keith Tedford is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

If it runs like our old L72 engine did, then you will be happy. It could idle along in traffic, take Grandma to church, or melt the tires. The choice was yours. Not killer by today's standards, but will be lots of fun for the next 200K miles.....unlike a lot of killer engines out there. I wouldn't mind doing similar with our L78.
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  #10  
Old Oct 27th, 11, 9:24 AM
GRN69CHV GRN69CHV is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

Quote:
Originally Posted by Keith Tedford View Post
If it runs like our old L72 engine did, then you will be happy. It could idle along in traffic, take Grandma to church, or melt the tires. The choice was yours. Not killer by today's standards, but will be lots of fun for the next 200K miles.....unlike a lot of killer engines out there. I wouldn't mind doing similar with our L78.
My favorite street motor was the even lower performance 427, 427/390. Friend of mine had a '69 Vette, 427/390, 4 speed, 3.36 gears. Bone stock. Was a treat to either drive or just ride in. Silky smooth from idle to redline which was about the same 5800 as the new ZZ427. I know GM likes to compare the ZZ427 to the 427/425, but it's probably closer to that 427/390 but with 90 more useable docile hp.
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  #11  
Old Oct 27th, 11, 10:17 AM
69-CHVL 69-CHVL is online now
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Vinny Vince
 
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Default Re: Just bought a zz427/480 gm perf. Engine

Quote:
Originally Posted by GRN69CHV View Post
Jim, I checked the GMPP catalog, description says it has the smaller 211/230, .510/.540 112LSA cam (same as the 454HO,502HO and ZZ454). Tech specs shows it having the larger 224/234, .527/.544, 110LSA cam from the ZZ502 motors. Tech specs also show it coming with the 770 carb rather than the 870. Which, be honest with you, I've ran both a 770 and an 870 prior, 770 was a better running carb. Can't explain why, it just was. Goodluck with it.
This is a prime example of why you cant trust anything GM publishes - all conflicting info, all the time.
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  #12  
Old Oct 27th, 11, 10:52 AM
cooperhw cooperhw is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

Nice. I think you are gonna love it for a long time. Sure you could change/swap/add/delete/move/adjust, etc. the heck out of it and make more power, but I think just bolting it in is exactly what I would do to it too.
I am putting (completely different, I know) a new crate LS2 6.0 liter motor in my 67 Chevelle street car. Everybody say swap the cam, do new heads, add headers, etc. But I am bolting the thing in just like the General sent it out. Stock as a rock this thing is supposed to make 400 HP and lots of torque and we re-programmed the computer (had to remove the vehicle anti-theft anyways) so it's supposed to make around 430HP while having mild manners, not getting hot in traffic, and getting around 16 to 20 MPG.
Anyhow, I remember a 427 I built a couple cars back and it spun like crazy and I loved it. I think you will love yours.
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  #13  
Old Feb 18th, 12, 12:49 PM
Fishyo Fishyo is online now
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Default Re: Just bought a zz427/480 gm perf. Engine

Update.

I have about 90 miles on this engine now and LOVE IT !!!

Very crispy power and tachs up really quickly. Pulls hard throughout the entire RPM range (to 5500 anyways, haven't gone past there yet).

I haven't really beat on it yet as we are still in the break in stages but OH BABY !! 3/4 throttle in 2nd breaks the tires loose.
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IF YOU DIDN'T BUILD IT YOURSELF...
YOU DON'T REALLY OWN IT
68 Chevelle SS 396 (GMPP427) RS500 3.31
(YES IT'S FAST...NO, YOU CAN'T DRIVE IT)
TC# 4227
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  #14  
Old Feb 18th, 12, 12:57 PM
Mike Mike is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

You have any inspection issues as Keith has brought up?
http://www.chevelles.com/forums/showthread.php?t=375897
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Old Feb 18th, 12, 1:35 PM
modchevelle modchevelle is offline
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Default Re: Just bought a zz427/480 gm perf. Engine

No ad's Steve.
When you post a $$ figure ,it's an ad.

Last edited by Mike; Feb 18th, 12 at 1:42 PM. Reason: removed ad
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