My 1968 Coupe trans-am tribute project - Page 14 - Vintage Mustang Forums
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post #196 of 319 (permalink) Old 04-04-2013, 04:40 PM Thread Starter
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The grill is just a stock '67 grill
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post #197 of 319 (permalink) Old 04-04-2013, 04:53 PM
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Thanks! Thats what I was thinking.

-Brett
1968 fastback 351w
1986 Iroc-Z
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post #198 of 319 (permalink) Old 04-05-2013, 01:58 AM
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Just spent the last 40 minutes reading this thread--very nice. The 69 GT350 (on the previous page) was raced originally by a good friend, he saw it last year for the first time in 30 years. Great job on your beautiful car.

1965 Tiger
1966 GT350
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post #199 of 319 (permalink) Old 04-05-2013, 05:49 AM Thread Starter
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Thanks!
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post #200 of 319 (permalink) Old 04-05-2013, 03:34 PM
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Back around page 5 of this thread it was mentioned that some of the old
Kar Kraft TA Blue Prints are avaiable,thought I'd pass a link along to the shop that has them.
Haynes High Performance
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post #201 of 319 (permalink) Old 04-06-2013, 12:37 PM
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I have been catching up on this thread. We also have a 68 coupe. You have done quite a job! We would like to ask some questions:

1. Up to the point where the engine failed what do you think you had in it in both hours and $$?

2. Have you determined a root cause of the engine failure?

3. What were your piston to wall clearances?

4. What were your main and rod bearing clearances?

5. What was crank endplay?

6. What was the ring gaps?

7. Did you have good oil pressure?

8. Was '13' used on a real trans am Mustang?

9. Is the car street legal (exhaust, etc)?

Thanks
Paul

Last edited by Paul1958; 04-06-2013 at 12:41 PM.
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post #202 of 319 (permalink) Old 04-06-2013, 01:02 PM Thread Starter
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I have been catching up on this thread. We also have a 68 coupe. You have done quite a job! We would like to ask some questions:

1. Up to the point where the engine failed what do you think you had in it in both hours and $$? No real clue on hours, but it took just over a year where a lot of the time was just one or two evenings a week and a full day on the weekend. Not counting the cost of the car to the point I started the track build, I have about $13k before I stopped tracking costs... not sure where I really ended up, but keep in mind NOTHING was outsourced other than machining the block and balancing the rotating assy.

2. Have you determined a root cause of the engine failure? Fairly certain a combo of lean tune and hyper kb pistons

3. What were your piston to wall clearances? my machinist said it was good, no clue otherwise

4. What were your main and rod bearing clearances? I didn't write this stuff down, but I seem to remember close to .003 crank and .002 rods

5. What was crank endplay? I don't recall, but it was within what my machinist said to check for

6. What was the ring gaps? set slightly looser than the kb specs called for

7. Did you have good oil pressure? Yes

8. Was '13' used on a real trans am Mustang? No, it was 22 like the first picture in the thread, had diff stripes originally too

9. Is the car street legal (exhaust, etc)? probably not technically without bumpers, all lights work and it's not much louder than any other muscle car.... but haven't been pulled over in it yet!

Thanks
Paul
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post #203 of 319 (permalink) Old 04-06-2013, 08:42 PM
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I wouldnt be so sure that a little leaning out caused all your problem. Take some advise from someone (me) that has learned the hard way: when you get your new engine done ask ALOT of questions from the machine shop. Get all the specs/clearances that were set up in writing. Dont take anything for granted. If not sure have it checked. I hope you have better luck with the new engine.

You car looks great!

Paul

ps
My good friend Jim Lovell says you may want to reconsider your car's number...
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post #204 of 319 (permalink) Old 04-06-2013, 09:40 PM Thread Starter
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The machinist is a pretty good friend, that doesn't make him the best builder, but I trust him.

I have my reasons for thinking it was a lean condition, but I'll never be able to prove what happened. It's part of why I'm running a different carb this time as well.

Thanks for the compliment!

Tell Mr. Lovell that me being born on the 13th trumps (for me) the bad luck he had up there! I bet he has some good stories to share!
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post #205 of 319 (permalink) Old 04-07-2013, 09:25 AM
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The machinist is a pretty good friend, that doesn't make him the best builder, but I trust him.
Доверяй, но проверяй (Trust but verify)
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post #206 of 319 (permalink) Old 04-09-2013, 12:12 AM
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jmn444,
I was just going thru this entire thread again and I saw where you talked about adding the hood pins. Do you have any pictures of what you had to do to the underside of the hood to install those pins?

Thanks
Paul
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post #207 of 319 (permalink) Old 04-09-2013, 09:10 AM Thread Starter
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I don't think I do, but I can take some next time I'm out in the garage. If I remember correctly, I just made the bottom holes slightly bigger and used a die grinder to make them into more of an oval front to back so that they would clear the pins completely. Nothing to fancy.
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post #208 of 319 (permalink) Old 04-09-2013, 12:10 PM
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Quote:
Originally Posted by jmn444 View Post
I don't think I do, but I can take some next time I'm out in the garage. If I remember correctly, I just made the bottom holes slightly bigger and used a die grinder to make them into more of an oval front to back so that they would clear the pins completely. Nothing to fancy.
Ok thanks for the info. If you can post some pics when you get a chance (no rush) that would be great. Thank.

Paul
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post #209 of 319 (permalink) Old 09-19-2013, 11:31 AM Thread Starter
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UPDATE:

The new engine is running beautifully... WAY better all around than the 1st build did.

Gonna get some dyno numbers in a couple weeks, but regardless of the number it simply FEELS better and has a smooth transition across the rpms and spins up to 6k nicely. I think I can get 6500 out of it, but giving it a little more time before pushing it that high.

I still had to mess with the jets a lot on the new carb, I'm down 9 jet sizes from how Prosystems shipped it, so not super impressed at the custom calibration, but it DOES run very well at this point.

Also ended up pulling off my cold air / ram air setup as it needed more air... Which tells me that I'm likely right that I'm making more power
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post #210 of 319 (permalink) Old 09-19-2013, 01:03 PM
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Glad to hear its back up and running. Did you go back with the 351, or did you add some cubes?


67 street and track beater project.
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