Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: Decisions, need opinions


Uber-Guru

Status: Offline
Posts: 1849
Date:
Decisions, need opinions
Permalink  
 


As you may know the 454 in my Biscayne is hurt and I am looking for a replacement.  I found a very nice rebuilt 454, 9-1 compression, good oval port heads, Comp Cam etc, should be over 450 hp.  Now I have found a complete 427/425 HP L72 engine carb to pan.  It is a running engine, it is a factory replacement for a 66 Vette, was manufactured in 1970 at the Tonawanda plant.  This would be a correct engine for my car.  It would be less driveable with 11-1 compression, solid cam and rectangular port heads.

So my dilemma is, get the more drivable motor, or bring my car closer to an original L72 configuration.  The L72 Motor is actually less money.

What say you?



__________________

68 L72 Biscayne My Way- fixes, changes and upgrades - https://www.flickr.com/photos/9729183@N02/sets/72157650578618747/

http://twodoorpost.activeboard.com/t59692612/my-68-biscayne-as-i-received-it-and-recent-fixes-and-upgrade/



Super Star!

Status: Offline
Posts: 7908
Date:
Permalink  
 

Pat Dilling wrote:

As you may know the 454 in my Biscayne is hurt and I am looking for a replacement.  I found a very nice rebuilt 454, 9-1 compression, good oval port heads, Comp Cam etc, should be over 450 hp.  Now I have found a complete 427/425 HP L72 engine carb to pan.  It is a running engine, it is a factory replacement for a 66 Vette, was manufactured in 1970 at the Tonawanda plant.  This would be a correct engine for my car.  It would be less driveable with 11-1 compression, solid cam and rectangular port heads.

So my dilemma is, get the more drivable motor, or bring my car closer to an original L72 configuration.  The L72 Motor is actually less money.

What say you?


 The choice is obvious, especially if it is the least expensive of the 2.



__________________

It's easier to apologize than to ask for permission!

1965 Biscayne: 350, PG, 12-Bolt. PS, PB.

1970 Chevelle Malibu: 53 on 753.

Brian Daniel McClure: 1970-2015. R.I.P. Brother.



Uber-Guru

Status: Offline
Posts: 1849
Date:
Permalink  
 

I'm going for the 427, hopefully will get it today.

Pat

__________________

68 L72 Biscayne My Way- fixes, changes and upgrades - https://www.flickr.com/photos/9729183@N02/sets/72157650578618747/

http://twodoorpost.activeboard.com/t59692612/my-68-biscayne-as-i-received-it-and-recent-fixes-and-upgrade/



Super Star!

Status: Offline
Posts: 7908
Date:
Permalink  
 

NICE!

__________________

It's easier to apologize than to ask for permission!

1965 Biscayne: 350, PG, 12-Bolt. PS, PB.

1970 Chevelle Malibu: 53 on 753.

Brian Daniel McClure: 1970-2015. R.I.P. Brother.



Uber-Guru

Status: Offline
Posts: 1319
Date:
Permalink  
 

Exactly what I would've done. High compression 427 baby.

__________________

Kevin

1964 Buick Special Deluxe SOLD

 1973 Chevelle SS L48 350

M20 4 -speed

all numbers-matching



Uber-Guru

Status: Offline
Posts: 1849
Date:
Permalink  
 

20150814_121602.jpg



Attachments
__________________

68 L72 Biscayne My Way- fixes, changes and upgrades - https://www.flickr.com/photos/9729183@N02/sets/72157650578618747/

http://twodoorpost.activeboard.com/t59692612/my-68-biscayne-as-i-received-it-and-recent-fixes-and-upgrade/



Uber-Guru

Status: Offline
Posts: 1033
Date:
Permalink  
 

Good choice pat now if I could just make a suggestion on those valve covers? Get some originals

__________________

1962 Dodge Dart max wedge,1963 Ford 300 496 ,1964 Chevrolet c10,1965 Pontiac Catalina,1966 L72 Biscayne,1969 Buick Special 



Senior Member

Status: Offline
Posts: 439
Date:
Permalink  
 

Nice engine,does this mean you will be staying with the solid cam?



__________________


2 Door Post Power User!

Status: Offline
Posts: 14024
Date:
Permalink  
 

Well done Pat.....you just improved your Biscayne in my book

Dan

__________________

**SITE MODERATOR**

1969 Chevelle 300 Deluxe Post Sedan Frost Green

1970 Buick Skylark Post Sedan Gulfstream Blue

Owner of the 1969 SS396 300 Deluxe Post Sedan Registry

http://m.youtube.com/watch?v=PM3DE8qI2NY

https://m.youtube.com/watch?v=Yn4xEmGypUw



Super Star!

Status: Offline
Posts: 7908
Date:
Permalink  
 

I notice many bolts missing in various areas (water pump, exhaust manifolds, valve covers...). Is this a known good running motor, were you able to hear it running?

Just looking out for ya.

__________________

It's easier to apologize than to ask for permission!

1965 Biscayne: 350, PG, 12-Bolt. PS, PB.

1970 Chevelle Malibu: 53 on 753.

Brian Daniel McClure: 1970-2015. R.I.P. Brother.



Veteran Member

Status: Offline
Posts: 35
Date:
Permalink  
 

L72 all the way !

  

 



__________________

 

 

 



Senior Member

Status: Offline
Posts: 204
Date:
Permalink  
 

Pat you made the right decision. If you can buy a real deal running L72 for less money than a mild rebuilt 454 that is a smoking deal.

Chad



__________________


Uber-Guru

Status: Offline
Posts: 1849
Date:
Permalink  
 

All right all right all right, the L72 just got home. Here's the story. It was in a 1966 Corvette Roadster. The owner thought it was an original motor, numbers matching. Turns out it is a CE code motor, that is, a warranty replacement. It was built at the Tonawanda plant in 1970. The heads on it are date coded 1968. It has the correct "snow flake" intake manifold. The owner decided he wanted a car he could drive anywhere, anytime, but still wanted a 427. So he had a shop install a brand new, new edition 427 crate motor and the shop took this motor as partial payment for their work. That's why it has that HEI distributor, it is a brand new, never been used, GM billet HEI that came in the crate motor. He did not use it because he wanted to retain the tach drive distributor. At some point not too long ago, he had replaced the original carburetor with a newer 3310 to get the electric choke. I am going to try and find out what happened to the original carb. This motor has numerous things I won't be using, certainly the valve covers, I have a set of chrome drippers, they are repops I think, but very nice. I won't be using those Corvette cast iron exhaust manifolds, and I don't think that 6 quart Corvette pan will fit in my car. So those are all things that should get a good price on EBay. It was a running driving motor until about 7 months ago when they did the swap. The bolts are missing because the manifold were off the motor and we had the valve covers off to look at the heads. We ran a compression test and it showed 200 pounds on six cylinders and 205 on the other two. That was with three revolutions. Because it had been sitting, he squirted some WD 40 in the spark plug hole just to fog the cylinder walls. As for the solid lifter cam, I was thinking about that sitting in traffic on the way home. I could swap in a similar spec hydraulic and set the original aside. Or, now that I know to use zinc in my oil I could just be very aware and not idle around too much. Now would be the time to make that choice while the motor is out. It has a short water pump, so I am going to be looking for all the pieces to make that work. I know I am not going to have a 100% correct car, but I am very excited to have a real L72 in it, even if it is a warranty motor. The heads at least are date correct.

So who wants to take a guess on what the value of a motor like this is, and what I paid for it?

DSCN0715.JPG

DSCN0716.JPG



Attachments
__________________

68 L72 Biscayne My Way- fixes, changes and upgrades - https://www.flickr.com/photos/9729183@N02/sets/72157650578618747/

http://twodoorpost.activeboard.com/t59692612/my-68-biscayne-as-i-received-it-and-recent-fixes-and-upgrade/



Uber-Guru

Status: Offline
Posts: 1553
Date:
Permalink  
 

Great find Pat!Your car is getting closer and closer to the one you had back in the 70's. Awesome!

__________________

68 Biscayne L/S 6.0 A4 MS MB

1966 Biscayne Day 2 Project

I don't suffer from Insanity, I Enjoy Every Second Of It



Super Star!

Status: Offline
Posts: 7908
Date:
Permalink  
 

I'll say 3500-4000.

__________________

It's easier to apologize than to ask for permission!

1965 Biscayne: 350, PG, 12-Bolt. PS, PB.

1970 Chevelle Malibu: 53 on 753.

Brian Daniel McClure: 1970-2015. R.I.P. Brother.



Uber-Guru

Status: Offline
Posts: 1849
Date:
Permalink  
 

Bisqik wrote:

Good choice pat now if I could just make a suggestion on those valve covers? Get some originals


 Better?

DSCN0720.JPG



Attachments
__________________

68 L72 Biscayne My Way- fixes, changes and upgrades - https://www.flickr.com/photos/9729183@N02/sets/72157650578618747/

http://twodoorpost.activeboard.com/t59692612/my-68-biscayne-as-i-received-it-and-recent-fixes-and-upgrade/



Senior Member

Status: Offline
Posts: 205
Date:
Permalink  
 

Nice score Pat....providing you run premium fuel and the timing is 'tweaked' your L72 will be a joy to drive.

I'm using Chevron Premium 94 in my Biscayne without any problems what so ever. I'm also using the original distributor/points etc. The 427's are a completely different engine than the 454's and like to rev with the shorter stroke.

Enjoy...

__________________


Uber-Guru

Status: Offline
Posts: 1849
Date:
Permalink  
 

Thanks for the encouragement Zapper, I wish we had 94 octane. I plan to install her as is and tweak the timing and advance curve. Maybe have to add some Torco, well see. I'll try it out for a couple months and if it is not tolerable I may do some work like the article in Super Chevy did. They lowered the compression to just under 10 and ended up with more power than the original.

Pat

__________________

68 L72 Biscayne My Way- fixes, changes and upgrades - https://www.flickr.com/photos/9729183@N02/sets/72157650578618747/

http://twodoorpost.activeboard.com/t59692612/my-68-biscayne-as-i-received-it-and-recent-fixes-and-upgrade/



Senior Member

Status: Offline
Posts: 205
Date:
Permalink  
 

I guess it's a little different for me because of the originality of my car.

The solid cam in the L72 sounds sweet especially around 5K...I run the valves as per GM's recommendation once a year (20/24 in/ex) and away we go.

The only engine that sounds better than an L72 @ 5K is a 302 zapper @ 7K.

Cal

__________________


Uber-Guru

Status: Offline
Posts: 2682
Date:
Permalink  
 

LS6 454 sounds pretty good at 5600 too.

__________________
1 2  >  Last»  | Page of 2  sorted by
 
Quick Reply

Please log in to post quick replies.

Support 2doorpost!
Select Amount:
.
.
.

.
.
.