Re: L-72, final assembly
 

Hey;
Same story with my 'correct' TRW, 11:1, LT1 pistons [img]/ubbthreads/images/icons/mad.gif[/img]
Won't do that again, next time only JE's.

Re: L-72, final assembly
 

I know someone who would like to have those 990 heads [img]/ubbthreads/images/icons/smirk.gif[/img] I believe they were LS7 crate motor heads which were located in "The Postmans"1971 Corvette. The production 1971 LS6 Corvette heads were aluminum.

Re: L-72, final assembly
 

Shor, you'll still be darn lucky if your compression is close to 11:1. Has anything been done to your heads? My chambers were like 113+cc, where they are supposed to be 107(?)cc...that also makes a BIG difference in compression. Also, what head gasket will you be running? Stock they came with steel shims, which were in the .020" neighborhood, where most of your gaskets are in the .038"-.042" range. Again, this makes a difference. And, your engine builder is right about the deck height...but I'd bet my "left leg" that it's larger than that if it's truly a virgin block. Also, BE SURE and go with a GM cam! I also learned that the hard way, even after Pete told me over and over.

All of this little stuff adds up, and EATS power. Live and learn I guess. [img]/ubbthreads/images/icons/tongue.gif[/img]

Re: L-72, final assembly
 

Rob,
Doesn't Comp Cams make the blue printed cams and lifters for GM?

Re: L-72, final assembly
 

Thanks Rob. On my notes I have written 108cc and next to it is written 10.321 ??
The cc's must refer to my heads. The stock 840 heads, from what I understand, have been off the car since 71 and have been resting in various places over the years. Including the trunk for about 10 years. The 10.321 must be some sort of compression number. Since it has a third digit after the decimal it must have came from some sort of exact formula. I will know more tommorrow. We went with the Comp cam stock l72 valvetrain kit. Nick said that the Gm kit is made buy Comp anyway? The assembled engine is now in my garage waiting for it's trip to Latrobe. Stefano was right about the spare heads, they are the ls7 iron.

Re: L-72, final assembly
 

If the heads are virgin, I would seriously doubt they are 108cc...which I believe is what the AMA spec is on them. That's what you want them to be, but from the factory they left plenty of room.

As for who makes the GM cams, I was thinking it was Crane, but you 2 said Comp, so it very well could be. All I know is that our next one will come from the GMPP book. Pete, any idea who grinds GM's cams?

Re: L-72, final assembly
 

Oh, here is a really good online calculator: compression calculator

Re: L-72, final assembly
 

Rob you were right. It is Crane. I don't know why I was thinking comp. Fummy thing, stefano was thinking comp also. The part # on the box is 969961 if anyone needs one.

Re: L-72, final assembly
 

(fummy)
I must be getting tired

Re: L-72, final assembly
 

It's only 11pm, itz bin u long weak, Benjamin won't sleap,
gotta go towrork, cnt stop typing, the big brown dog jumped over the lazy fox
zzzzzzzzzzzzzzzzzzzzz [img]/ubbthreads/images/icons/smirk.gif[/img]