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  #46 (permalink)  
Old 11-14-2013, 06:00 PM
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Well to give an update I cleaned the block and did most of the prep work tonight. Honed, enlarged and smoothed the oil returns, ported the rear main cap oil passage, and cleaned all the gasket surfaces. I'll need to clean it again prior to paint and assembly but I hope to have the short block together this weekend. I'll also be calling mike jones about a cam regrind. I'm looking for something like the voodoo 270hr but maybe a little milder, only looking for about .525" lift with 1.6 rockers, Going for low maintenance, we'll see what mike has to say.

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  #47 (permalink)  
Old 11-14-2013, 07:46 PM
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The ZO-6 427 has an intake duration around 210 and it makes peak power at 6300 rpm.The heads flow huge numbers so that is where the breathing comes from.
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  #48 (permalink)  
Old 11-15-2013, 07:05 AM
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I attached a couple pictures, the cam tunnel was the hardest area to get clean (honestly the only area that took any real effort), probably because its the hardest to get to.

I bought 5 cans of oven cleaner from the dollar store, have used 2 and 1/2 so far and this **** is AMAZING. This block was uglier than sin with 1/4" of backed on grime in some areas and a couple soakings of oven cleaner over a day followed by a quick washing with Purple Power diluted with hot water and some plastic scrub brushes and 95% of the block is spotless, which is good enough for me to do the basic block prep work and then go back for further cleaning.

I've talked about Purple Power being good before (which i used a diluted mixture to clean the caps, lifters, small pieces, and all the bolts and its still amazing) but the dollar store oven cleaner is just as awesome. For an investment of less than $10 I'll have this block clean- a shop can charge $100+

Lastly, I included a picture of the ported cap, I also did the oil returns in the block (no pic) but this cap mod takes all of 2 minutes with a grinder and a stone and really aids flow. Some grind away a lot more and really push the cap to the max going all the way to the edge of the gasket but the only real restriction is the extra casting right in front of the oil passage through the cap, I'm sure if you hold a cap in front of you you'll see what I'm talking about. When doing the block I found one return passage was blocked by some extra casting material, be sure to pay attention to the rear drain backs when prepping your own block. I'll be running a HV pump with a ported inlet and am trying to decide on what spring to use. This oiling system will be overkill and cost me a little power but since it came in with a spun rod (very common mode of failure for this engine type) I'm taking no risks.

I'll try to take some pictures of this project as it goes along, as people have asked for photos in the past and I never thought to take any.


Most of you probably don't care for allthis rambling, but for those that do there it is.
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  #49 (permalink)  
Old 11-15-2013, 09:01 AM
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Quote:
Originally Posted by F-BIRD'88 View Post
If you don't get the engine compression ratio correct on this 302 CID build its going to be lame.
flat top pistons and Lt1 heads milled .030" with a .026" gasket, don't know piston to deck clearance yet.

It'll be around 10:1, maybe a hair over. Regardless of what it is it won't be changing so it's nothing I'm going to get worked up about. It'll probably run just fine on 87 octane.

Being down a few hp isn't anything I'm about to worry about on such a cheap build.
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  #50 (permalink)  
Old 11-15-2013, 10:05 AM
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Talked to Mike- out of my price range, talked to Scott at Delta Cams, and they will be doing the cam for me. the LT1 forums seem to be popular with Delta regrinds so hopefully it all works out well.
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  #51 (permalink)  
Old 11-18-2013, 08:05 AM
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A shot of the rotating assembly going in, nothing fancy: L99 crank and rods, ARP bolts, speedpro hyper pistons, sealed power rings.

A shot of the chamber side of the heads before they go to the machine shop, just did a basic clean up, again nothing fancy.
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  #52 (permalink)  
Old 11-18-2013, 10:15 AM
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Quote:
Originally Posted by F-BIRD'88 View Post
I trust you are going to get them planed now that they have been destroyed with Zip disks.
I'm having them milled as much as the shop can, I'm seeing .050" is possible.


FWIW though I have never have a single gasket failure on a surface I'm used a disc on- everything from heads to exhaust to thermostat housings, etc. I'm not saying its the "correct" way, as it isn't, BUT so far I haven't had a problem. I also always use a self applied coating of some sort too though- never install a gasket dry.
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Old 11-18-2013, 06:36 PM
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AP72 is the L99 crank,"cast"?
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  #54 (permalink)  
Old 11-18-2013, 06:42 PM
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Yes. And pm rods.
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Old 11-18-2013, 07:35 PM
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Quote:
Originally Posted by ap72 View Post
Talked to Mike- out of my price range, talked to Scott at Delta Cams, and they will be doing the cam for me. the LT1 forums seem to be popular with Delta regrinds so hopefully it all works out well.
You generally get what you pay for. I use Mike Jones exclusively, I like the 1 on 1 service. I find his prices very competitive.
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  #56 (permalink)  
Old 11-18-2013, 07:54 PM
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I agree he's good, but delta will work just fine for this application, I don't need it to be perfect, just need it to work.
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Old 11-19-2013, 05:31 AM
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Quote:
Originally Posted by ap72 View Post
I agree he's good, but delta will work just fine for this application, I don't need it to be perfect, just need it to work.
delta is very popular with the 60* engine crowd we have been using there off the shelf 260 and 272 grands + having them grind us custom cams for a very long time .

I also have them grind all my custom turbo grinds for my customers.never had a compliant and never had one go flat on break in, i always get a set of lifters from them with the cam


delta is also very popular with the honda,vw and mitsu guys as well
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  #58 (permalink)  
Old 11-19-2013, 05:39 AM
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To have a regrind harden would be a good idea and that doesn't normally cast that much more.
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  #59 (permalink)  
Old 11-19-2013, 06:47 AM
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The lt1 cans are apparently very durable cores, better than the lower end aftermarket stuff, shouldn't have any problems taking what I want to throw at it. If you come across any lt1 cores for cheap I'd pick them up if you want a roller cam sbc. Cheaper and better than a low end aftermarket core. No fuel pump lobe though.
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  #60 (permalink)  
Old 11-26-2013, 06:51 PM
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Cam regrind and shipping to my door from delta ended up being $109 bucks. Half what mike wanted. Mike may be better and worth the extra cost to some but I'm happily surprised with how cheap delta ended up being.
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