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  #1  
Old Apr 30th, 08, 02:27 PM
70RS/SS396 70RS/SS396 is offline
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Default 427 L88 specs?

Hello

Does someone has the complete build (parts) specs for the 427 L88 engine. And the difference between the 67-68 L-88 and the 2nd design 69 L-88?

Thanks Kristoffer
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  #2  
Old Apr 30th, 08, 03:35 PM
pdq67 pdq67 is offline
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Default Re: 427 L88 specs?

Spec'd the same except for compression and heads!

Early L-88 is 12.5 to 1 CR'd w/ a poorer head design than the later engine has that's at 12 to 1 CR., if I remember right. I think GM figured everybody would automatically work the heads over right off the bat so they limped along until later.

Cam should be the same as pretty-much everything else.

Just a good set of 4-tube, long headers opened by themselves will up an L-88's power to like 540hp EASY w/ a good tune!

pdq67
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  #3  
Old Apr 30th, 08, 04:39 PM
roadblocks roadblocks is offline

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Default Re: 427 L88 specs?

The '69 L88 also had the 7/16 in rod bolts. The open chambered heads offered in the '69 model year were vastly superior to the closed chambered configuration. Some of the early '69 L88 cars are reported to have been closed chambered design.
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  #4  
Old May 1st, 08, 12:10 AM
70RS/SS396 70RS/SS396 is offline
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Default Re: 427 L88 specs?

Okey, but what I can understand there was 2 different camshafts?
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  #5  
Old May 1st, 08, 04:01 PM
pdq67 pdq67 is offline
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Default Re: 427 L88 specs?

No, not stock, over the counter, yes.

They made these stock solid lifter cams.

375 and 425hp/396, 402 and 427; 242/242, 114/108, .520" gross lift.

L-88, 264/270, 112/108, .560"/.580" gross lift;

LS-7(?)/ZL-1, 262/273, 110/?, .560"/.600" gross lift; and

CanAm cam at .600"/.600" gross lift.

I haven't saved complete BB solid lifter cam spec's so you will need to dig them up somewhere.

pdq67

PS., I think the LS-6 use's the 242/.520" cam??
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  #6  
Old May 1st, 08, 07:30 PM
oger oger is offline
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Default Re: 427 L88 specs?

The 67-68 closed chamber motors used the 535 cam as far as I know. The 67 was suppost to have a reverse rotation cam for the gear drive but I only saw them as over the counter items. The 69 open chamber motors used the 180 cam. The 535 sort of works and has a real nasty idle for a street car the 180 isn't good for anything in my experience. 68 motors got the good 7/16s rods only the 67s had the 3/8s full foating design that really wasn't up to the task.
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  #7  
Old May 1st, 08, 11:07 PM
70RS/SS396 70RS/SS396 is offline
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Default Re: 427 L88 specs?

Okey, but the .540" / .560 camshaft ? I thoungt that was the cam for the 68-69 L88?

And the ZL1 camshaft? I dont think they used this in the open chamber L88?
From GM Parts Direct:

3959180 Mechanical Flat Tappet
This mechanical flat tappet is a ZL-1 and LS-7 mechanical lifter competition cam, good in 427-454. (Use spring P/N 3916164.) The duration at lash point in degrees (intake/exhaust) is 327/333; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 580/620. Valve lash is .024/.026 and lobe centerline is 110 degrees.
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  #8  
Old May 2nd, 08, 03:37 AM
pdq67 pdq67 is offline
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Default Re: 427 L88 specs?

I think you need to subtract lash and you are down to the .540"/.560" lift you mention.

pdq67
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  #9  
Old May 2nd, 08, 12:37 PM
70RS/SS396 70RS/SS396 is offline
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Default Re: 427 L88 specs?

But look here under TIMING - Lift ?

http://www.corvetteactioncenter.com/...l88engine.html
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  #10  
Old May 2nd, 08, 06:31 PM
oger oger is offline
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Default Re: 427 L88 specs?

I bought a crate 68 L-88 it had the 535 cam in it. The 69 is an open chamber motor and used the 180 cam.
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  #11  
Old May 2nd, 08, 07:51 PM
sbcBill sbcBill is offline
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Default Re: 427 L88 specs?

The 69 L-88 I bought new in 1970 had the 7/16" rod bolts and open chamber CI heads, I do not remember what cam the engine had out of the crate. I hope this helps. In a 66 Chevelle the car would really run hard and fast. The first time I drove it I exited the car shaking, WOW! I wish I had it today.

Bill
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  #12  
Old May 2nd, 08, 11:58 PM
70RS/SS396 70RS/SS396 is offline
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Default Re: 427 L88 specs?

Okey, it seems to be some different camshafts. They maybe took what they had??? But the .540 / .560 camshaft doesent exist to buy now what I can see?
.....My camaro once had a -69 2 nd design L88 in it, and it shound be really fun to build or buy one and reinstall....but its not cheap, and i just bought a 540
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  #13  
Old May 3rd, 08, 07:45 AM
OAKLYSS OAKLYSS is offline
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Default Re: 427 L88 specs?

Quote:
Originally Posted by 70RS/SS396 View Post
Okey, it seems to be some different camshafts. They maybe took what they had??? But the .540 / .560 camshaft doesent exist to buy now what I can see?
.....My camaro once had a -69 2 nd design L88 in it, and it shound be really fun to build or buy one and reinstall....but its not cheap, and i just bought a 540
L88s never used the 9180 cam, that was ZL-1 and LS-7, and over the counter only. The 9180 cam is a great cam used in the right set up. The idle of these and the L-88 cams is nasty! You can go to the Chevy dealer and order part #12364058 for the GMPP cam made by Crane for GM. It is the blueprinted replacement for the 67 L-88 cam 3925535 .560/.580 264/269 @.050". 1968 and 1969 L-88 used cam #3928909 (8911) same specs. Should be tame in a 540.
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  #14  
Old May 3rd, 08, 09:21 AM
70RS/SS396 70RS/SS396 is offline
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Default Re: 427 L88 specs?

Thanks. But Im not going to use something in the 540. The 540 is complete. But it should be fun to build an exakt replica of the L88.

There is no replasement camshaft for the .540 / .560 camshaft?

But if you build a exakt replica of an L88,and use the .560 / .580 camshaft, and use the 12:1 comp pistons....can it be driven on 98 octane? Does the camshaft has enough "overlap" for 12:1 and 98 octane?
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  #15  
Old May 3rd, 08, 12:03 PM
OAKLYSS OAKLYSS is offline
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Default Re: 427 L88 specs?

Quote:
Originally Posted by 70RS/SS396 View Post
Thanks. But Im not going to use something in the 540. The 540 is complete. But it should be fun to build an exakt replica of the L88.

There is no replasement camshaft for the .540 / .560 camshaft?

But if you build a exakt replica of an L88,and use the .560 / .580 camshaft, and use the 12:1 comp pistons....can it be driven on 98 octane? Does the camshaft has enough "overlap" for 12:1 and 98 octane?
Yes, I have a ZL-1 built to stock specs. It is all the same as the 69 L-88 except the cam and the aluminun block. It runs on 91 octane no problem due to the late closing intake valve event. You may find a L-88 cam on ebay, but an NOS ZL-1 cam will cost you $1000+ if you can find one (they are not availible at Chevy). Here is what you need for a 69 L-88: 512 block, 074 aluminum heads, 7115 crank, 3969804 rods, 3959105 pistons (3947886 ID), you can use Speed Pro 2308 pistons but they are not availible in standard size, only .030" and up. 3933198 manifold, Holley 4296 #3955205 carb, 1111927 TI distributor, 210 TI coil. (add an adjustable vac can). The following are availible new from your GMPP parts dealer:
3969870 oil pump (remove Corvette pick up and install 3955281 tube), 7/16 push rods 3942416, 3942415, rockers 3959182, damper 3879623 and misc small parts. Aftermarket makes a 40731 fuel pump repro. I have an NOS replacment for the ZL-1 cam if you are interested. These motors are race motors that can be driven on the street and are very powerfull!
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69 SS350 ZL-2 4 speed, original paint, unrestored -SOLD
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