L-88 question

[61 chevy]

hello all..new member here... i have a few questions. building a 1969 L-88 engine. Have correct 3963512 code block, looking at a set of pistons with #3947886 cast in the underside. are these correct? also are the connecting rods in this motor supposed to be full floating? anyone have a rod casting number? thanks for the great site and any info you would give me.

 

[JOE BYRNE]

Welcome

I don't have the answers you are looking for but I just wanted to welcome you to the CAC!! You will get all of the answers you are looking for and more.

 

[redvett]

hello all..new member here... i have a few questions. building a 1969 L-88 engine. Have correct 3963512 code block, looking at a set of pistons with #3947886 cast in the underside. are these correct? also are the connecting rods in this motor supposed to be full floating? anyone have a rod casting number? thanks for the great site and any info you would give me.

I have 3969804 P/N for the 427 HD rod and they were full floating. Piston P/N was 3959105 for std & 3959107 for .030

 

[61 chevy]

thanks guys...

Redvett...i'm assuming those are part numbers...they are not the same as casting numbers are they?

 

[redvett]

No these P/N are out of an old GM parts book. Casting numbers are different.

 

[61 chevy]

thanks again redvett......i was able to find a spec sheet for a zl-1 which listed that piston part #3959105 using casting # 3947886. so thats great news for me now i just need to find the casting number for the rods.. and i thought this may be easy

 

[JohnZ]

There was a post on the NCRS board two or three days ago by Joe Lucia that detailed the complete history of BB rods, especially the heavy-duty ones.

 

[redvett]

thanks again redvett......i was able to find a spec sheet for a zl-1 which listed that piston part #3959105 using casting # 3947886. so thats great news for me now i just need to find the casting number for the rods.. and i thought this may be easy

If your building a clone or even a real L-88 car i would go with a better rod. The stock rod broke at Lemans. No one will ever see the inside of your engine and the duribility would be much better even the pistons can be replaced with clones.

 

[early shark]

61Chevy,

I purchased a NOS set of L-88, ZL-1 rods, part # 3969804. I will look and see if there is any casting #'s forged on them (I didn't think there was) and get back to you.

 

[61 chevy]

early shark...there should be a 4 digit number on the side of the balance pad on the small end of the rod..i believe this would be the casting number. thanks, you guys are very helpfull.

 

[early shark]

okay, I'll look. Will this be raised embossed numbers or stamped numbers?