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104471 Posts in 12233 Topics by 4716 Members
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31  Camaro Research Group Discussion / Maintenance / Re: 1969 Z/28 DZ 302 overbore to .040? Piston Source? on: July 21, 2013, 04:41:28 PM
Chick - Yea, there are a lot more lately than there ever were before - for sure..
I would like to try and get some at some point myself as my .030"s are pretty loose in the MO although when I last had it in the car they seemed still to work pretty well.
A 1/16 / 1/16/ 1/8 ring pack can't take too much rocking before they start leaking some I would imagine though..
I would also imagine anyone who doesn't want the full load that some of these full pop up pistons provide could also probably request the tops be cut some to lower the compression down to a somewhat more manageable factor like a shade over 10:1 if they asked J&E prior to ordering..
32  Camaro Research Group Discussion / Maintenance / Re: 1969 Z/28 DZ 302 overbore to .040? Piston Source? on: July 20, 2013, 11:42:18 PM
Try:

http://www.jepistons.com/Catalogs/SRP/Chevy_SB/302-327_dome.aspx

Randy
33  Camaro Research Group Discussion / Restoration / Re: Huggar Orange touch up paint on: July 14, 2013, 11:54:01 PM
Just take the car to any paint supplier that has a scanner and get it scanned in an appropriate spot where it would have received a similar amount of wear or abrasion and/or fading from the sun and get them to run up a small test sample from scratch or if the scanned code can be matched to a know color code in a sample book - if good at their job they can usually advise you from there.
Most sharp guys in body shop supply paint stores can usually give a pretty good estimate of how close they can match up any existing paint on a vehicle due to its condition and type and also from that they usually can give you some idea of how much any sample you will have made up will darken when it dries.. 
34  Camaro Research Group Discussion / Maintenance / Re: Loud Knock on: April 22, 2013, 09:36:16 PM
Just wanted to add that on the possibility that it has something to do with the attaching hardware (bolts and captured nuts) being broken or loose - I had this problem with my Z 2/8 and couldn't tighten up the bolts as the clips had broken allowing the nuts to work themselves loose up inside the pockets.
I sourced some bolts with a larger diameter and formed (I call them captured) nuts from a local GM dealer which were not just regular nuts spot welded to a clip, but actually press formed. They were quite expensive - what GM bit isn't? - but the larger diameter bolts still fit through the holes in the spring eye brackets and the formed nuts still squeezed into the holes in the body pocket with a bit of tweaking to result in a truly stronger than OEM deal..
Once finally together, although an expert judge may catch the subtle difference, this arrangement is a much stronger deal than the original size hardware and better than any aftermarket clip that just has regular nuts tacked on, certainly..

Randy
35  Camaro Research Group Discussion / Maintenance / Re: Loud Knock on: April 13, 2013, 05:03:43 PM
Does the front spring mount appear to be secured properly into the floor cavity with the 3 bolts and captured nuts?
Seems to me I heard someone else complaining about a similar noise and they found that either the formed nuts or their retainer clips had broken and things got flopping around when a big enough bump was hit or at a particular angle on one side but not at all when the other hit a similar bump..
You can't really see if all is well if the car is raised on a ramp lift where the load is pushing the front spring eyes up into the pocket - since it loads the entire spring, pocket, and attaching hardware to sometimes make it appear to be intact and normal.
Only way then is to give the bolts themselves a turn to see if they are in fact tight - and obviously if on a post style lift any looseness should be more readily apparent at least visually..
Other possibilities - spring eye bushing itself // spring mount/bushing, or u bolt problems // shock mount problem // or exhaust hanger on that side if dual exhaust..  

Good luck - curious to know what you eventually find..   Randy  
36  Camaro Research Group Discussion / Maintenance / Re: 302 DZ Valve adjustment on: April 08, 2013, 08:01:10 PM
Probably the Comp rockers are a lot closer to the 1.5 ratio than the OEM ones. They are cast and not stamped so I would imagine they are almost as good as a machined true roller rocker in fact.
They should work good at the .030" settings that John recommends in his procedure for a rocker with an accurate ratio, and I would imagine that with .026" clearances they might not hurt the cam or lifters unless you got into a coil bind situation (if your springs weren't ideal).
But almost certainly with a setting that is too tight you could end up with valves open too early and still open too late and/or possibly not have them close completely or long enough to trap all of the compression you need for a good flame front and efficient burn over the top of the piston. all of that could lead to a lot of lost compression and maybe even reversion causing a poor running engine..
Or maybe I'm just 'all full of it' - Ha!
I'll leave a lot of the higher theory to John, and like you, hope that he sees your question and chooses to respond to initial your question.
37  Camaro Research Group Discussion / General Discussion / Re: TO: CRG members What year Camaro(s) do each of us own? on: April 07, 2013, 08:57:27 AM
No problem Chick - I wasn't intending to come across as being picky - just wondering if you in fact had found another car/owner with the exact same block stamping as ours..
Cheers - would love to see some updates of your amazingly detailed project - are you getting close to completion?

Randy
38  Camaro Research Group Discussion / General Discussion / Re: TO: CRG members What year Camaro(s) do each of us own? on: April 06, 2013, 08:29:42 PM
Here is a list at team camaro of 68Z's ownership. I started a thread a couple years ago and know some have been sold off, etc. but was a sizeable list of 68 Z/28's. And of course quite a few team camaro members are CRG members. I know of one CRG member who has a 01C 68Z as his engine was built the same day as ours, 12/21/67
Here is the thread: http://www.camaros.net/forums/showthread.php?t=182224&page=13

10C Dale68Z orangeZZ/Blk std LOS07779 Dana Demo Cowl P. ODT POP BOS
11D RPOL72 Ivory/Blk Vinyl/Gold std. int
11E Jerry@CHP White Survivor#351124
12B 2X4 Butternut Yellow-black vinyl/Blk std RS LOS17444 radio delete
12D Hot Rod Todd Blk/Blk deluxe RS Cowl P. NOM
12D Cook_DW MatadorRed/Blk deluxe LOS Cowl P. no tach/console
01B 68camaroz28 Butternut Yellow/Blk std. int. Cowl P. ODT BOS
02C copojo White/Blk std D80 RadioDel Nor#383394 Cowl P. GM Canada Docs
02D sixd8rs Tripoli Turqoise/Turqoise int. NOM #388484
02D realzed born w/Seafrost Green/blk std ODT 61K miles GM Canada Docs
02E paulbruce@sympatico.ca Rallyee Grn/Blk std LOS 302 emblems
02E bowties427 LemansBlue/Blk Std. LOS#332229 Z/28 emblems
02E X66 714 Corvette Bronze/Blk houndtooth LOS#332262 Z/28 emblems
03A SEK Z28 Matador Red/Blk std. In family since 1970
03A Jerry@CHP Matador Red #392050
03C zeds68 Butternut Yellow/Blk std. M22 8N398XXX
03C 302V8 British Green Std 8N399xxx
03D norcal 302 Lemans Blue/Med. Blue Deluxe int. LOS built
04A ggtsvnv Lemans Blue/Blue std. Crawford Chev.,Slayton TX Orig tran/rear
04A Jerry@CHP Dave Strickler's Ol Reliable #411100
04A pjbizjak Ralley Green/ blk std. #413105 storage over 30 yrs.
04B 68RSZEE28 Matador Red/749 RS w/head rests
04C zeds68 British Green/Blk std M22 8N418XXX
04C enio45 Corvette Bronze/Blk std. Build sheet and POP
04D Paul68RS/Z28 British Grn/Wht vinyl/Deluxe Parch. Cowl/headers
04D never2manycamaro's British Green/Blk std #422699 POP
04D 68z28sd British Green/Blk std. #426203
04D ZAPPER68 Lemans Blue w/wht vinyl/Parchement N4265xx POP #'s match
05A rodent4 British Green/Blk std. int.
05B fastfreddy OO Bronze/Blk std. #429642
05B sooperdave Grotto Blue/Blk std. #N431070 POP Black stripe
05C ZZMike British Green/Blk std. N4368XX M20 ODT POP Cross-ram
05D royal67rs Matador Red 8L341406
05D 68zproject ZZ British Green/Blk std. POP
06C fuelnut Lemans Blue/Deluxe Black (orig) N4549xx Orig blk/trans/rear
06C rocket74 Lemans Blue/Blue N456800 BX4:88 POP/Canadian Doc RadioDel
07A buzz_mn_58 seafrost green/712 standard int. vin N4630XX
07A Dayton68Z28 Matador Red, cowl plenum #463934
07B bbd564 Lemans Blu/Blk H-tooth Console/Gauges Orig except 1 repaint
07B yankeechaser Lemans Blue/Blk Houndstooth w/headrests Nor#467951
07C Sonet Ermine White/Red std. 2 owner 38K miles POP
07C Shupee Lemans Blue/Blu std. NOM #4754
07C TerryC British Green/BlkH-tooth N468XXX Heavily optioned post #160

"I know of one CRG member who has a 01C 68Z as his engine was built the same day as ours, 12/21/67"
Quote
..

I think you mean 02D Chick - if not then there are 3 of us..
Regards - Randy
39  Camaro Research Group Discussion / Maintenance / Re: 302 valve setting with roller rockers on: March 09, 2013, 01:00:44 PM
Many early cams were single pattern deals and the aftermarketers came out with longer ratio rockers that would to a small degree allow users to add lift and to a small degree more duration to alter the cam characteristics by using them.
They are usually an easy and cost effective 'crutch' to make a cam seem bigger depending on whether you needed more intake flow due to manifold or combustion chamber restrictions or more exhaust timing to assist in getting rid of burnt gasses through poor exhaust setups and are a lot easier to install than changing out the cam itself.. 
40  Camaro Research Group Discussion / Maintenance / Re: 302 valve setting with roller rockers on: February 04, 2013, 10:44:21 PM
I believe the reason the 90 degree JohnZ/CRG method only works well when OEM stamped rockers are used and not the cast roller, stamped roller tip (comp-type) or machined roller types, is because the tight lash settings as suggested in this method take into account the traditional inaccuracy of most OEM stamped versions - in that they never prove to be even close to the claimed 1.5 ratio - thus the advised tighter cold lash tolerances are used to somewhat make up for this 'lazy' ratio inaccuracy..
Aftermarket and roller type versions are produced to ratios much closer to what is advertised and therefore the cold lash settings as suggested with CRG method would end up with the valvetrain being much too tight when everything warmed up..
I'm sure JohnZ could probably suggest what he considers would be a more appropriate lash for rockers with a real 1.5 ratio, and if I had to guess I would bet it would be close to the .030" the cam was designed and named for..
Randy
41  Camaro Research Group Discussion / Mild Modifications / Re: Speedometer gearing... on: January 25, 2013, 01:45:35 PM
As an aside to this whole deal - I asked Carson (the Vette owner) how he ended up with a Beaumont 327 and transmission in his car prior to swapping in the ZZ3 engine that is in there now, and his response was "it was an original fuel injection car and I just couldn't get it running right back in the '60's so I swapped drivetrains with a guy who had a '65 Beaumont with a 327 275/4 speed...
Thus the reason for the 3851325 case number that John nailed and that now is in the car.
Ouch! Considering just the cost of a '57 fuelie unit these days - let alone what it would do for the value of his car now, that's gotta hurt - eh?
Just shows how little stock was put on OEM drivetrains and numbers matching pieces 'back in the day'..
42  Camaro Research Group Discussion / Mild Modifications / Re: Speedometer gearing... on: January 25, 2013, 12:01:23 PM
Sorry to be so late responding as to the outcome of this experiment..

Thanks Joe for the heads up on the 'O' ring - he did finally manage to order a 22 tooth gear from GM as John suggested and got it changed over and Matt as you also suspected, John was indeed correct with the 22 tooth gear fixing the problem perfectly..

Beautiful car with a very good running engine - now with an accurate speedo - what else could anyone ask for?

Thanks again to you all for the assistance - Randy & Carson (the '57 owner)!!
43  Camaro Research Group Discussion / General Discussion / Re: Interesting Color Combo on: January 08, 2013, 08:27:43 PM
Danny - The way I read your comment - you were just admitting your own inability with tags and making fun of yourself in doing so - which I figured was all in good humour and OK, since I feel the same about my own ability to decipher fakes from real ones as well!
Randy
44  Camaro Research Group Discussion / General Discussion / Re: BLOCK CAST DATE VS PAD STAMP DATE on: January 05, 2013, 10:06:36 PM
that should read 'designated' and not 'designed a'..
45  Camaro Research Group Discussion / General Discussion / Re: BLOCK CAST DATE VS PAD STAMP DATE on: January 05, 2013, 10:03:52 PM
Yep - the plants were on "rock & roll" back then.  We were pouring 2500 tons per day at Tonawanda MCP.
That certainly was a lot of metal moving - Can you relate just how the metallurgy changed and/or was tracked during much of the casting in a sense of the quality control of the molten batches when so much is being poured and so quickly?
I've heard where '010' and other notations cast behind the timing chain and bellhousing areas referred to the metallurgy content of pour batches in that more Nickel and maybe Tin were introduced into the composition when pouring certain batches of blocks.
Is this in fact true and if so why and how were any additional alloy amounts introduced and/or monitored?
Also, what if true is the reason to pour such blocks verses any others ie: was there a reason for such blending to be done or needed?
Having worked in and around smelters and assay labs in the nickel industry here in Canada for years, I find such things interesting and my own 302 has some of these casting notations on the block and I always wondered if it was really true that it designed  for  'performance blocks' needing maybe more strength over 'regular' ones..
Thanks - Randy
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