Author Topic: Not sure where this should be posted  (Read 4828 times)

jim28607

  • Member
  • ***
  • Posts: 143
    • View Profile
69 RS/SS BB 4 spd
68  RS/SS Convertable BB 4spd

Tx-Z 302

  • Member
  • ***
  • Posts: 219
    • View Profile
Re: Not sure where this should be posted
« Reply #1 on: November 18, 2018, 01:47:41 PM »
Send that Xmas gift right on over to texas. Lol
Chris W

jim28607

  • Member
  • ***
  • Posts: 143
    • View Profile
Re: Not sure where this should be posted
« Reply #2 on: November 18, 2018, 02:06:44 PM »
Send that Xmas gift right on over to texas. Lol
I am secretly trying to figure out how I can get
Approval from the minister of finance and law!! 🤣🤣
69 RS/SS BB 4 spd
68  RS/SS Convertable BB 4spd

bcmiller

  • CRG Member
  • *****
  • Posts: 4027
    • View Profile
Re: Not sure where this should be posted
« Reply #3 on: November 18, 2018, 04:36:06 PM »
“No damage history or repairs performed”.

Yet it appears to have been decked.
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

jim28607

  • Member
  • ***
  • Posts: 143
    • View Profile
Re: Not sure where this should be posted
« Reply #4 on: November 18, 2018, 04:56:35 PM »
“No damage history or repairs performed”.

Yet it appears to have been decked.
I noticed that too, any idea what does that stamp means?
69 RS/SS BB 4 spd
68  RS/SS Convertable BB 4spd

william

  • CRG Member
  • *****
  • Posts: 3130
    • View Profile
Re: Not sure where this should be posted
« Reply #5 on: November 18, 2018, 05:53:14 PM »
I have examined more than a few of these. You have no idea what has been done to resurrect ZL1 blocks after an engine failure. Ugly welds on the outside of a block are common; I looked at one that had a rod go through the lifter gallery. Yes it was repaired.

I know of two ZL1 Camaros that were raced from new; both engines were decked as part of a race engine build-up. I'm not convinced this one was decked.

If the engine is as described and checks out, the asking price is not out of line.
Learning more and more about less and less...

69Z28-RS

  • Hero Member
  • *****
  • Posts: 5778
  • owner since 4-Apr-1976
    • View Profile
Re: Not sure where this should be posted
« Reply #6 on: November 18, 2018, 08:36:47 PM »
I agree with William...  If I was a big block fan, I'd have to add this one to my garage... and then find something to put it in!  If I were going to be a 'big block' fan, it would have to be an all aluminum one... :)
09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bcmiller

  • CRG Member
  • *****
  • Posts: 4027
    • View Profile
Re: Not sure where this should be posted
« Reply #7 on: November 18, 2018, 08:41:03 PM »
Here is a pic of the deck.

FWIW, maybe 6-8 years ago I had a chance to buy a similar engine, but not assembled, for about $8K.  It had an assembly number, but no partial VIN and was not decked.  I don't think it was ever installed in a car.  JM advised me to pass.
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

X33RS

  • Hero Member
  • *****
  • Posts: 1092
    • View Profile
Re: Not sure where this should be posted
« Reply #8 on: November 19, 2018, 02:53:41 PM »

I know of two ZL1 Camaros that were raced from new; both engines were decked as part of a race engine build-up.

This.^^   It was not uncommon, then or now, to deck a block during a rebuild or blueprint.  Not because of damage, but because the deck heights on almost nearly every engine...well.....sucked, to put it lightly.

Almost every engine build we do here requires decking if the customer is worried about having a tight quench and even deck height and compression ratios across the cylinders.  I can't tell you how many virgin blocks I've seen that are uneven (taper) from one end to the other, as much as .011"  and this can't be corrected without decking.  Even my brand new Gen 6 502 crate engine has an uneven deck height, and the pistons are .020" in the hole to boot.  Not a good scenario when looking to make HP.

If you find a good machinist willing, they can be decked without disturbing the stamps.  Another option, as long as the block is even front to back, rather than decking, I prefer to do custom piston pin heights to get the piston at or very near "zero" deck for better quench and mixture motion.

It's all pretty common practice these days to "square things up" during a proper rebuild.

z28z11

  • Hero Member
  • *****
  • Posts: 1853
    • View Profile
Re: Not sure where this should be posted
« Reply #9 on: November 26, 2018, 01:20:26 AM »
In my opinion. broaching the deck surface instead of face milling probably has quite a bit to do with the inconsistency of the deck as far as flatness and surface finish are concerned. I've sold to and serviced several engine manufacturers in the area (GM, Nissan, Hyundai) - modern aluminum engine block machining generally (but not always) utilizes large diameters face mills, up to 400 mm, using mostly PCD inserts with wipers - flatness and surface finish are held to very tight tolerances. Most blocks have cast iron liners, so the mill has a bimetallic surface to contend with (some are cast in place, others are frozen and "dropped" in; they require decking to finish). All of the processes add up to why modern engines can last so much longer with decent maintenance than our good ole small and big blocks used to (metallurgy has advanced a lot to boot).

All that said, it makes you wonder where we would be by now if we had the engine and fuel management technologies prior to the horrendous '74 and later emissions dogs. But i'll still stick to my 302's, 350 and 396 equipped cars, any day.

Regards,
Steve 
1968 Z28 M21/U17 BRG/W 1967 Chevy ll Nova SS 
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06  1949 3100 5wd 235/6

RichSS2006

  • Member
  • ***
  • Posts: 47
    • View Profile
Re: Not sure where this should be posted
« Reply #10 on: December 10, 2018, 03:50:05 PM »
https://www.facebook.com/marketplace/item/295208124426858/
They also have these XT wheels. Take a look at all of the pictures. Perhaps this is where the ZL1 engine camefrom.https://www.facebook.com/marketplace/item/353770148535157
69 X22 L78 M21 10-10
69 Z11 L48 M20 50A

crossboss

  • Hero Member
  • *****
  • Posts: 779
  • ^ New engine project
    • View Profile
Re: Not sure where this should be posted
« Reply #11 on: December 11, 2018, 12:38:46 AM »
Send that Xmas gift right on over to texas. Lol



+1, I agree…right over to Cypress, TX!   lol
Just another T/A fanatic. Current lifelong projects:
1968 Olds 442 W-30
1969 Mustang Fastback w a Can-Am 494 (Boss 429)