[oldbogie]

Originally Posted by zildjian4life218

k thx. the block is 3 5/16".. so about 1/4 to 3/8.

Carefully check the center to center bolt distance, the ZZ3 and ZZ4 blocks use a different thrust plate, actually two different plates, closest to your 3-5/16ths measure is part number 10168501 which is 3.294 on centers which is mighty close to 3-19/64ths, which is bracketed in your range of 3-1/4th to 3-3/8ths.

For the sake of knowing the other is the ZZZ, ZZ1, and ZZ2 thrust plate which is 10088128 at 3.62 inch.

I have no idea as to why all these different sizes.

Bogie

[zildjian4life218]

Originally Posted by oldbogie

Carefully check the center to center bolt distance, the ZZ3 and ZZ4 blocks use a different thrust plate, actually two different plates, closest to your 3-5/16ths measure is part number 10168501 which is 3.294 on centers which is mighty close to 3-19/64ths, which is bracketed in your range of 3-1/4th to 3-3/8ths.

For the sake of knowing the other is the ZZZ, ZZ1, and ZZ2 thrust plate which is 10088128 at 3.62 inch.

I have no idea as to why all these different sizes.

Bogie

awesome thanks. I ordered the 3.294" thrust plate this morning. I think summit got an improperly labeled bag because the 3.620" thrust plate I have measured up at 3". Ill see when this other thrust plate comes in and see what happens. Thanks for all the help so far everyone

[Hotrod 80]

Originally Posted by zildjian4life218

This should work right? http://www.summitracing.com/parts/SUM-G6601/

Every other timing chain for a factory roller cam seemed to be closer to $80-100 im confused as to if this is the only one I could really find.

This chain will work in the Vortec block and clear the retainer plate . The top oil galley plug boss must be clearenced . I clearenced mine with a 4" andgle grinder and a 120 grit flap wheel .

[Hotrod 80]

LT1 and V6 used the smaller cam retainer .

[zildjian4life218]

I got the 3.294" thrust plate and over the weekend i bolted it up to check the fit and it bolted up fine. Im just waiting on the cam now from summit. The invoice said it should be shipping out today because they had to order it but we will see. I got 1/4-20 x 3/4" bolts from the local hardware store and they are actually a little too long for my application. Ill have to get 1/2" long bolts sometime this week.

[ap72]

Let me know how that cam works out for you. I've been looking at that one for a while to replace my prc108 cam. Let me know about power, mileage, idle vac, etc. It looks to be a good hot street cam.

[cobalt327]

I lost track of what p/n cam and the lift of the cam you are thinking about using. I don't think it was ever said what the specs were for the lift before there are problems, so I looked it up in another post I made on this.

Regarding the problems associated w/higher lift cams and the stock dog bone lifter retainers and lifters, from HERE:

According to Crane's Director of Valvetrain Research and Development, Mark Campbell, valve lifts of more than 0.530 inch at the valve with a 1.5:1 rocker can allow the lifter to fall deep enough into the lifter bore (because of the lobe's small base circle) that the steel retainer can lose its grip on the lifter body. This allows the lifter to spin in the bore and destroy the camshaft. In checking a few cam catalogs, it is possible to order a hydraulic roller camshaft with enough lobe lift (in excess of 0.354 inch) to create this situation, so just be careful. This is why Crane created a long-travel hydraulic roller lifter that will allow you to run a high-lift hydraulic roller cam with the stock lifter configuration. These eliminate the problem but are also much more expensive than OE replacement lifters. Another solution would be to run a 1.6:1 rocker ratio with a reduced lobe lift cam to accomplish more valve lift.

Valve train points to CHECK.

Adjust valves.

[zildjian4life218]

Originally Posted by cobalt327

I lost track of what p/n cam and the lift of the cam you are thinking about using. I don't think it was ever said what the specs were for the lift before there are problems, so I looked it up in another post I made on this.

Regarding the problems associated w/higher lift cams and the stock dog bone lifter retainers and lifters, from HERE:
Valve train points to CHECK.

Adjust valves.

howards - 180325-08... even with the cam NOT having a reduced base circle will I have this issue? and thanks for the links. I will read through them.

[zildjian4life218]

Originally Posted by ap72

Let me know how that cam works out for you. I've been looking at that one for a while to replace my prc108 cam. Let me know about power, mileage, idle vac, etc. It looks to be a good hot street cam.

will do! no problem hopefully everything goes well with it.

[zildjian4life218]

Well got the cam put in these past couple days with the exceptionally beautiful weather. Started right up first time and sounds awesome idle is smoother than I expected for 108*LSA.

hopefully in the next couple weeks ill go through and check over everything and get it put on the road so I can get the rings sat. I only have maybe 10-15 miles since I put new cast rings in it and they are a lot better than when I first drove it but its still smoking pretty bad.

Hopefully in 33 days when the track opens I will be able to post some time slips and maybe some videos. Right now I haven't really been able to figure out exactly what the car likes for timing and such but initial is about 22* and total is at about 33-34 and I get about 13" of vacuum in gear idling around 1000 rpm and in park I get 16-18" of vacuum at about 1200rpm.... when I turn down the idle to say 900-950 in park I get about 14" and in gear about 10-11" of vacuum... I still have a lot of playing around with it to get it to idle the way I want and running good. But thanks again to everyone who chimed in on the build and was able to point me in the right direction!

[zildjian4life218]

Well I finally got some time today to give howards a call for valve springs and they told me that cam requires 135lb on the seat and 350-360lb open. Can anyone throw out any suggestions? I wanted to try out comp beehive springs but I don't see any within that range.

They only springs I see on summit have an installed height of 1.800". I believe SBC are set up or 1.700" so does that mean I need to run a +.100" valve or do they make valve locks that will offset the retainer by .100". I have seen .050" but not .100".

Thanks for all the help.

[ap72]

They have .050" locks and the retainer can affect the installed height. You can also cut the seat or get new longer valves. Stock installed height can vary, and is affected by the vj. The only way to know is to check it.

[zildjian4life218]

Originally Posted by ap72

They have .050" locks and the retainer can affect the installed height. You can also cut the seat or get new longer valves. Stock installed height can vary, and is affected by the vj. The only way to know is to check it.

I didn't think you were supposed to cut the spring seat. I will probably end up just running some longer valves... but I guess it depends on what valve springs I can find.

[zildjian4life218]

Will any of these work?
http://www.summitracing.com/parts/CC...n/?prefilter=1
http://www.summitracing.com/parts/CC...n/?prefilter=1
http://www.summitracing.com/parts/HR...n/?prefilter=1
How close do I have to be to the 135 open and 350-360 seat numbers?
My only problem with the last one is that the installed height is 1.880" But maybe with +.100" and a .050 lock and a new valve job I can make it work

[ap72]

The howards 98213 springs should work for you. Competition products sells them. Install at 1.750" and you should be fine.