L88/l71???

[George W.]

Pulled out a box I had forgotten about---rotating assembly.
Crank is a 7115
Cam packaged with solid lifters--Pink paint on one end?
Photos below of rods/pistons/push rods

Are these GM pieces, or ???
Thanks,
G.
8 each of these


No markings on top of pistons

The number below is 25---photo not good.



7/16" rod bolts ?


"Dimple" and green paint





"Keepers" for wrist pins---I have another set of "dimple rods with 3/8" bolts that have "full floating" (no keepers) wrist pins---What is/are the different application (s)?

[Clem Z.]

Re: L88/l71???

Pulled out a box I had forgotten about---rotating assembly.
Crank is a 7115
Cam packaged with solid lifters--Pink paint on one end?
Photos below of rods/pistons/push rods

Are these GM pieces, or ???
Thanks,
G.
8 each of these


No markings on top of pistons

The number below is 25---photo not good.



7/16" rod bolts ?


"Dimple" and green paint





"Keepers" for wrist pins---I have another set of "dimple rods with 3/8" bolts that have "full floating" (no keepers) wrist pins---What is/are the different application (s)?

7115 3.76 stroke 427 chevy, piston with spirolocks are full floating wrist pins. measure and post the height of the domes on the pistons to see what CR. if you can move the rod and the wrist pin is does not move those are full floating. what is the width of the compression rings ??? full floating GM rods have a plating around and in the pin hole.

[George W.]

Re: L88/l71???

Thanks for the reply Clem.

I'll dis-assemble one of the rods/pistons today to check for plating and will measure dome and compression rings.

Any comments on the piston/rod combo that do not have the spirolocks?

Any comments on the push rods?

Anything to look for to identify the cam shaft?

Hard to tell in the photos, but the upper end of each rod is somewhat dis-colored, like they were heated. Any thoughts?

Also in the box were guide plates, rockers/locks, main cap and head bolts, oil filter adapter, oil pressure "plug" (large) that goes into the left side of the block, oil pan and timing cover bolts. Anything "special" to look for on these items?

This appears to be a complete long block package (minus the block and heads). I do not remember how this came into my possession; might have been with a car/parts purchase years ago?

Thanks again,
G.

[Clem Z.]

Re: L88/l71???

Thanks for the reply Clem.

I'll dis-assemble one of the rods/pistons today to check for plating and will measure dome and compression rings.

Any comments on the piston/rod combo that do not have the spirolocks?

Any comments on the push rods?

Anything to look for to identify the cam shaft?

Hard to tell in the photos, but the upper end of each rod is somewhat dis-colored, like they were heated. Any thoughts?

Also in the box were guide plates, rockers/locks, main cap and head bolts, oil filter adapter, oil pressure "plug" (large) that goes into the left side of the block, oil pan and timing cover bolts. Anything "special" to look for on these items?

This appears to be a complete long block package (minus the block and heads). I do not remember how this came into my possession; might have been with a car/parts purchase years ago?

Thanks again,
G.

push rods came in 3/8" diameter and 7/16" diameter,L-88 and they look like GM to me. BB cams were usually stamped on the back end of the rear journal. the rods without the spirolocks would have to be heated and be a blueish color to be assembled. the free floating rods the plating silver gray in color should be down the rod at the top and be seen without disassembly

[Joe L.]

Re: L88/l71???

Pulled out a box I had forgotten about---rotating assembly.
Crank is a 7115
Cam packaged with solid lifters--Pink paint on one end?
Photos below of rods/pistons/push rods

Are these GM pieces, or ???
Thanks,
G.
8 each of these


No markings on top of pistons

The number below is 25---photo not good.



7/16" rod bolts ?


"Dimple" and green paint





"Keepers" for wrist pins---I have another set of "dimple rods with 3/8" bolts that have "full floating" (no keepers) wrist pins---What is/are the different application (s)?

George------



'7115' crank was used for 1969 L-88/ZL-1. Also, sold over-the-counter for MANY years (but no more).

Pushrods pictured could be GM #3879654 and 3879656 which were used on 1967-68 L-88 or they could be other GM part numbers. They look like welded ball, 3/8" pushrods.

I'm almost sure the rods are GM #3969804. These are the 1969 L-88/ZL-1 rods which use boron steel, 7/16" rod bolts. These are full floating pin type rods which require piston pin retainers (e.g. Spirolok). As far as I know, these are the only full floating pin rods that GM ever offered for big blocks. These rods can be converted to pressed pin by bushing them.

As far as the pistons go, they are generally configured like L-88 pistons. Look to see if there are any forging numbers on the UNDERSIDE.

If the cam is GM, there should be cast-in numbers between 2 of the lobes AND/OR a stamped in number on one of the ends

[George W.]

Re: L88/l71???

Okay,
Underside of pistons have GM TRW and 3906648
These are full floating rod/wrist pin configurations---The rod slides on the stationary wrist pin which is held in place with the spriolocks (sp?).
Some of the rod/rod caps appear to be indexed (8 and 8---or 2 and 2)
Numbers on the end of the cam are J37 and what appears to be 8911
Castings (?) between lobes on the main shaft consist of CWC, D2, maybe K66, and a few others.
I have some photos to post, but my photobucket is running slow.

[George W.]

Re: L88/l71???

Hi Joe,
Thanks for your reply.
I just posted more info before I saw your post.
I have photos of the cam castings/stampings, the piston numbers (3906648), but my photobucket is "stuck" in the upload function?

The other set of pistons are aftermarket (.030 over), but appear to be on GM dimple rods with the 3/8" bolts and non sprioloc wrist pins (these are not full floating, as the wrist pin moves side to side in the piston bore. These look like 11:1:0 domes.

Hopefully my description of the cam stampings/castings is helpful---waiting on those photos.
G.

[George W.]

Re: L88/l71???









Top compression ring measurement


Second compression ring measurement





Misc. cam markings

[Clem Z.]

Re: L88/l71???

i can not read your mics or the ruler in the pictures BUT if the rings are .062 and the dome heigth is close to 7/16" those are L-88 pistons. the cam markings on the end of the bearing journal i have never seen before.

[Joe L.]

Re: L88/l71???

Top compression ring measurement


Second compression ring measurement





Misc. cam markings

George-----


I cannot ID the cam. However, I do think it's a later SERVICE GM cam, manufactured after they went to generic cores.

I think the pistons are likely 1968 L-88, but I cannot be certain. I don't have any reference to that forging number.

[George W.]

Re: L88/l71???

Thanks to all for the information,
G.