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103593 Posts in 12177 Topics by 4697 Members
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3931  Camaro Research Group Discussion / Originality / Re: 69 deluxe door panel markings. on: February 01, 2006, 11:07:25 AM
Probably has nothing to do with X33, as that only denoted exterior trim items; more likely that it's an assembly sequence number.
3932  Camaro Research Group Discussion / Maintenance / Re: Rebuilt motor tuneup on: January 31, 2006, 10:48:17 AM
Doubt if the plugs have anything to do with it - I run AC R45S plugs in all my small-blocks for normal driving - 44's tend to foul somewhat in around-town driving, and 43's are WAY too cold for normal driving.
3933  Camaro Research Group Discussion / Maintenance / Re: Rebuilt motor tuneup on: January 30, 2006, 09:05:35 PM
If the two marks from your piston-stop exercise are both exactly the same distance from the "0" mark on the timing tab, your existing marks are OK. Advancing the cam 4* shouldn't have any significant effect on ignition timing - will just move the torque curve down a little.

I don't recall how the Unilite distributors manage centrifugal advance - haven't had one for many years. I run my '69Z with 8*-10* initial advance, 26* in the distributor, all in by 2800 (for total timing of 34*-36*), and a NAPA/Echlin #VC-1810 vacuum advance unit that adds 15*, and is fully deployed at 8" Hg. and connected to full manifold vacuum.
3934  Camaro Research Group Discussion / Maintenance / Re: What octane should I put in my '68 ?? on: January 30, 2006, 08:54:47 PM
If you see normal vacuum at idle with a gauge at the carb nipple, that's a manifold vacuum source; if you don't see vacuum there at idle but you do when you open the throttle, it's a "ported" vacuum source. If you can't find a manifold vacuum source on the carb, you can use the fitting on the intake behind the carb.

Q-Jets don't have a "venturi vacuum" system - that's only found on Holleys with vacuum secondaries. Venturi vacuum" is created by mass airflow past a pickup tube in the main venturi, and is unrelated to manifold vacuum.
3935  Camaro Research Group Discussion / General Discussion / Re: 2657 block on: January 30, 2006, 08:44:29 PM
Does anyone know for sure when the 3892657 block was produced?

Thanks

dab67

'64-'67; it was the last small-journal 327 block.
3936  Camaro Research Group Discussion / General Discussion / Re: 1968 Z-28 on: January 30, 2006, 08:40:25 PM
O.K. I finally got to check the block that is rumored to be from this car. Here are the #'s from the block, the cowl tag and the vin.

cowl: 06B H257
 ST 68-12437 LOS 42128 BODY
 TR 722 G-G PAINT

V.I.N. 124378L343505
ENGINE: V0423MO 18N425549

Could this be the original block??
 

No, that engine was originally installed in a '68 Norwood car, VIN #425549; your car was built at Van Nuys.
3937  Camaro Research Group Discussion / Maintenance / Re: Rebuilt motor tuneup on: January 29, 2006, 12:04:48 PM
I'm out of town this week in Florida, so I don't have my "30-30" crank angle-cam lift diagrams handy; I'd find true TDC, re-mark the balancer, then adjust the valves.
3938  Camaro Research Group Discussion / Originality / Re: 68 AM FM Stereo on: January 29, 2006, 12:00:43 PM
Here's that same setup in the Estes '68 Z/28 convertible...
3939  Camaro Research Group Discussion / Mild Modifications / Re: Possible Axle swap on: January 27, 2006, 10:35:46 PM
4.11's SUCK for anything but cruising around town - you'll see 3900 rpm at 70 mph on the highway. Furthermore, if you buy it and later decide to gear it down to 3.55 or 3.36, you'll have to shell out $400 for a new Series 3 Posi unit, PLUS the cost of the new gears (the 4.11 uses a Series 4 carrier).
3940  Camaro Research Group Discussion / Mild Modifications / Re: Aftermarket wheels for my '68 RS/SS w 4 piston calipers? on: January 27, 2006, 10:32:43 PM
Just call the manufacturer of the wheels you're interested in and ask them if they'll clear '67 Camaro calipers (with prepaid return shipping if they don't).
3941  Camaro Research Group Discussion / Maintenance / Re: Rebuilt motor tuneup on: January 27, 2006, 10:28:11 PM
If you have roller rockers with a true 1.5:1 ratio, change the recommendation in the Research Report for lashing the valves for your car to .030" cold (the .026" cold lash recommendation is only for use with stock stamped rockers, which are actually only 1.37:1 at initial contact). As noted above, get a piston stop tool and verify ACTUAL TDC vs. what your balancer and timing tab show, and re-mark the balancer with a new timing index line aligned with "0" if necessary. If I had a dollar for every mis-matched balancer and timing cover I've seen in the last 20 years, I could afford to buy at Barrett-Jackson.  Grin
3942  Camaro Research Group Discussion / Restoration / Re: Id a balancer & on: January 27, 2006, 10:20:01 PM
Second photo of the balancer didn't show up in the above post - here it is.
3943  Camaro Research Group Discussion / Restoration / Re: Id a balancer & on: January 27, 2006, 10:18:33 PM
Photo below of a correct original '69 DZ302 timing cover - the timing tab is welded to the cover. Photo also of a 302 8" balancer scribed to show both timing index marks - note that the timing index mark for '68 usage is directly in line with the crank keyway and a pulley bolt hole, and the '69 timing index line was moved counter-clockwise about ten degrees from the keyway positiion, which also generated a different timing cover and tab to match the relocation. Don't mix a '68 balancer and a '69 timing cover, or vice versa, or your timing tab marks will be out of whack.
3944  Camaro Research Group Discussion / Originality / Re: 186 question for John Z or whoever else knows:) on: January 27, 2006, 10:01:21 PM
The standard small-valve 186 heads DEFINITELY need the chamber wall adjacent to the intake valve cut to unshroud it when 2.02" valves are installed, just as the 461/462 heads require; if this isn't done, they'll flow less air with the 2.02's than they did with the 1.94's. I think the cutter used was on the order of 2.34" diameter, but I'm out of town this week and don't have access to my prints - any GOOD automotive machine shop will have the info, as most have done hundreds of heads this way. Photo below is of the 186 chamber with factory 2.02" valves - look closely at it and you can see the unshrouding cut adjacent to the intake valve.
3945  Camaro Research Group Discussion / General Discussion / Re: 1968 Z-28 on: January 27, 2006, 09:49:05 PM
The engine source, assembly date, and identifying suffix code is stamped on a machined pad on the front of the block immediately below the front of the passenger side cylinder head; the "MO" suffix will be the last two characters of the stamping, which will look like "V0306MO".
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