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Discussion Starter #1
Let me start by saying I am new to the forum and mostly new to small block Fords. Hoping I can get some help here with a couple problems I cannot figure out. I have an RX7 with a 302 roller motor that had major problems. Really low compression on 2 cylinders and water out the exhaust. Rather than rebuild, I found a .030 over, 302 balanced short block with 9:1 pistons. I got such a great price I brought it home. I have pulled the old motor and had the GT40 heads that were on it done. Now as I am putting this thing together I have couple problems. The guy that I bought it from says it came from an ’85 Lincoln, but the serial number on the block says it is an 80. I have no reason not to believe him, since he was selling a lot of stuff his father left when he moved to Florida. He has no idea how or if the crank was balanced.
The assembly numbers say it was assembled in ’83. So, it has a one piece rear main seal which ,makes it at least an ’81? The real issue is balance, I understand that anything after ’81 is 50 oz. I want to reuse the balancer and flex plate from the roller motor. The new shortblock has a non roller cam and lifters and the block does not have the tapped holes for the roller cam spiderweb. Another piece of the confusion is that the new shortblock has a single roller timing chain. I am swapping the serpentine system I have from the roller over to the new shortblock which meant I have to use the timing cover and water pump from the roller motor. This necessitated cutting down the cup shaped deal on the end of the cam in the short block.
It is also not clear to me if the GT40 heads will work with the non roller cam and lifters that are in the new shortblock. I am stuck right now primarily because of the balance issue, and the head question Any help with either one would be greatly appreciated. To net this all out, I am confused as heck right now. The shortblock serial number is E0AE , with a D30 under that and a 6 under the D30. The assembly code is 3J28.
Help!

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The real issue is balance, I understand that anything after ’81 is 50 oz. I want to reuse the balancer and flex plate from the roller motor.
Welcome to the forums. Based on your other info, it is a 50 oz/in balance engine, and your old damper and flex plate will work fine. To absolutely confirm this (in-case someone built a Frankenstein engine), pull the oil pan and look on the crankshaft for a casting number, such as 2MAE or E1AE-AA, etc. We can verify the balance and the proper seal from that.
It is also not clear to me if the GT40 heads will work with the non roller cam and lifters that are in the new shortblock.
Yes, they will. You will have to use the pushrods from the old engine or ones of equivalent length. This is due to the difference in length of flat-tappet and roller lifters. The head doesn't care otherwise.
The assembly code is 3J28.
This should be the best clue, but that is assuming an engine that has never been worked-on. The date is indicating November 28, 1983, and would therefore have been for the 1984 model year. Ford does not include the letters "I" an "O" in their alphabet, as they get confused with numbers easiest.

Also, the "cup thing" you cut down is the fuel pump eccentric for an engine that was carbureted. The old engine was originally fuel injected and did not have one. If replacing the timing set, be sure to use the correct one for the 'new' carb engine, as it's different thickness than the EFI version. FYI, the one-piece main seal began in December of 1982 for most 302/5.0L engines. HTH

David
 

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Ok had a bunch typed but PSIG beat me to it.
 

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Discussion Starter #5
You guys are wonderful! All my frustration this week just went away. I will definitely be back. I also have an '03 Cobra vert with several mods. Now up to 15K miles. My daughter drives an '04 Mustang vert with a V6. This is the first site where I have gotten good answers the first day. You cannot believe how much I appreciate your help.
 

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Discussion Starter #6
PSIG I sent you a PM
 

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Discussion Starter #7
Well, I got very delayed with some personal issues, so I just got the motor running last week. Bad news, the fp eccentric I cut down still cut a hole in my timing cover when the cam bolt backed off. Quite a mess, too bad it ran so well. Anyway, I have torn it down, and everything seems to be OK except for timing cover, water pump and it ate the cam. lifters,cam bearings. Crank,pistons,rods,block,etc all look good. I am making my parts list now and should have it back together in a couple weeks. Really happy with how it ran for 30 seconds. :)
 

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Hmmm.... Why does it sound like you forgot to put in the cam retaining plate?? Are you positive it was just the bolt backing out?
 

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Discussion Starter #9
Yes, the plate was there. I really am not sure how the bolt backed out. Only thing that makes sense is that I either forgot to tighten the bolt, or somehow the eccentric got caught on the cover. There was a nice circle from that, and the bolt crashed through the center of that circle. I was really careful on the cutting and measurement and even checked it twice by turning it over by hand. So I am left with maybe I didn't tighten. Assembly this time will be more exacting.
 

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Its common practice to clean the cam and retainer bolts/bolt holes and use a little blue Locktite (242) on the threads to prevent such an occurrence.
 
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