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107543 Posts in 12507 Topics by 4812 Members
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31  Camaro Research Group Discussion / Maintenance / Re: Front Brake Hoses.. on: August 06, 2013, 10:20:03 PM
Getting to the point in the next night or two where I intend to bleed the brakes to try and tighten up the pedal and I thought I might as well try and flush the whole system with new fluid while I'm at it..
Couple of ??'s here prior to starting it:

What type of fluid would have been used in a '68 system from new..  DOT3 or 4? And if the answer to that is DOT3 is there any advantage or detriment to upgrading to DOT4 at this point?
How much fluid should it take to get most if not all of the present fluid replaced by bleeding each cylinder or caliper at a time until the old stuff is finally purged out?
Can DOT4 be used as the replacement fluid if DOT3 was normally the choice for a '68 system - and will it co-exist with any remnants of DOT3 that might still remain (I thought I read somewhere a couple of years back the DOT4 is backwardly or downwardly compatible - but DOT3 not forward or upwardly so) but not sure why..?
I don't have a vacuum bleeder and probably won't get one for the rare number of times hopefully this job will be necessary - but will just getting my 'helper' to pump and hold the pedal while I crack each subsequent bleeder screw, make for a very long drawn-out deal until most if not all of the old stuff is purged out?
And finally - I would assume that purging would be done in the same fashion IE: furthest wheel way from the master first, flowed by the second-most one, etc. etc.. 
Thanks - Randy
32  Camaro Research Group Discussion / Maintenance / Re: Front Brake Hoses.. on: July 30, 2013, 10:37:03 PM
Thanks Ed - my first though (if nothing obvious poked out at me) was to try and bleed them - although in the nearly 15-20 years since I took the calipers apart and cleaned up the bores some and put new 'O' rings and seals everywhere, this is the first instance of problems they would have ever provided - IF they are in fact the problem.
I was always expecting at some point to have to have SS sleeves pressed in - but the rebuild back 'when worked so well I have actually never really given it a second thought until I just now realized how long it has actually been..
Thanks again..
33  Camaro Research Group Discussion / Maintenance / Front Brake Hoses.. on: July 30, 2013, 08:44:38 PM
Can anyone recommend part numbers I could use to try and order some replacement front brake hoses for my '68 Z2/8?
Most Wagner-type listings I have referenced don't pull up appropriate part numbers for vehicles that old.
My pedal suddenly got very soft when I was getting home from storage back in early May.. (I'm almost ashamed to admit that it hasn't moved since) and the level in the master seems reasonable when I checked it in passing, last week - and I'm wondering if I have a hose or two getting soft as they were new back in the mid '90's and may be the problem now..
The front calipers aren't leaking at all and although I haven't pulled the back wheels off to check there is no leakage anywhere that I can see on the inside of them or the drums, so I'm thinking it most likely a hose expanding and giving me that soft feel.
I'm open to any other suggestions - since I plan on trying to figure this out next week, so I can try and get at least some usage out of the car before I have to put it back into Winter storage again..
Thanks - Randy

34  Camaro Research Group Discussion / Originality / Re: Chambered Pipe Vs. Regular Muffler Bracket hole for 1969 Z28? on: July 22, 2013, 07:14:39 PM
If you have an AIM for '69 models I believe it probably give the road clearance specs near the front of it (I know the '68 version I have does)besides showing the measurement reference points as well..
35  Camaro Research Group Discussion / Maintenance / Re: 1969 Z/28 DZ 302 overbore to .040? Piston Source? on: July 22, 2013, 07:10:07 PM
You may wish to check out the CHP site to see if it states what Jerry uses for his 302 rebuilds or racing engines - or better yet fire him off a call or email and see if he sells any particular ones himself - besides asking him of course, for particular preferences he has and why..
36  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..
37  Camaro Research Group Discussion / Maintenance / Re: 1969 Z/28 DZ 302 overbore to .040? Piston Source? on: July 20, 2013, 11:42:18 PM

38  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.. 
39  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..

40  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  
41  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.
42  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?

43  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:

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 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"

I think you mean 02D Chick - if not then there are 3 of us..
Regards - Randy
44  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.. 
45  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..
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