Author Topic: boss values and difference between 1969 and 1970 model  (Read 3736 times)

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Offline TXBoss302

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Re: boss values and difference between 1969 and 1970 model
« Reply #15 on: September 20, 2011, 04:26:35 pm »
Any difference in crank shaft strength between 69 and 70 cranks ? I always heard the 70 cranks were stronger. :-\

Another question: which car would be quicker in the 1/4 mile ? 69 or 70 say that both cars are stove stock that where geared with 3:91s and close ratio trannys ?

69 cranks were cross-drilled while 70's were not... if I remember correct. 70 may be a touch quicker with better low end response due to the smaller intake valves... don't know if there was a significant weight difference.
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Offline BOSS-STANG

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Re: boss values and difference between 1969 and 1970 model
« Reply #16 on: September 20, 2011, 05:44:08 pm »
So does cross drilling the crank make it weaker ?

Offline EricDickerson

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Re: boss values and difference between 1969 and 1970 model
« Reply #17 on: September 20, 2011, 06:44:52 pm »
i found a 69 to restore. i dont like the look of the 70. if i had not a found a 69 i wood have not have one. my dad had a 69 b2. i had a 69 fastback. only mustangs i like are 65-66 fastback,69 fastback. would not own any other years. i do like the front of a 68 shelby. hope answers your question. foto of my dads b2. my b2 is in tear down mode.

Geez, you make it sound like the 70 is like a 71-73 style. Most of the time, I have point out the differences to people on the 69 compared to the 70.  :P
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Offline supershifter2

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Re: boss values and difference between 1969 and 1970 model
« Reply #18 on: September 20, 2011, 07:21:23 pm »
i like the 4 headlights, grill, tail lights of the 69.
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Offline JRGBOSS

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Re: boss values and difference between 1969 and 1970 model
« Reply #19 on: September 20, 2011, 07:29:32 pm »
If you have ever seen the dashboard of a 1968 Mustang you have to ask yourself what happened in 1969 and 1970. Looks like major cost cutting.
« Last Edit: September 20, 2011, 11:05:21 pm by JRGBOSS »
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Offline supershifter2

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Re: boss values and difference between 1969 and 1970 model
« Reply #20 on: September 20, 2011, 07:44:18 pm »
i never have liked anything about a 67-68 mustang except the front grill of the 68 shelby.
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Offline RadBOSS

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Re: boss values and difference between 1969 and 1970 model
« Reply #21 on: September 20, 2011, 08:09:14 pm »
So does cross drilling the crank make it weaker ?

I doubt the cross drilling makes the crank weaker (the change in section modulus for bending or torsion is not very significant).  It obviously alters the stress distribution some what by removing some of the material in the middle of the section (mainly the rod throw),  but the difference stress's and strength afforded by no hole are very little compared to the outside of the section,  so its a mute point.  

I suspect it was dropped either for cost (extra machining operations) and/or the advantage of being crossed drilled (a more continuous oil flow) was of little consequence.  Either crank was made of the same material.
« Last Edit: September 20, 2011, 08:17:33 pm by RadBOSS »


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Offline AK 69Boss

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Re: boss values and difference between 1969 and 1970 model
« Reply #22 on: September 20, 2011, 08:44:44 pm »
I guess I am partial to the 69 since I saw one when I was a kid around 1976 and could not afford the $1,000 the guy wanted for the body since he pulled the engine for a drag car.  So 3 years ago when I finally could afford one I ended up with a 69 but I would have bought a 70 if I could have found one for the money.

Offline BOSSNCOBRA

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Re: boss values and difference between 1969 and 1970 model
« Reply #23 on: September 20, 2011, 08:59:19 pm »
I don't know if there was any difference in performance between the two years but The 69 crank should be lighter being crossdrilled with hollow throws so, I would think with less recipicating weight the 69 would wind up quicker. I'm with supershifter2 on the 4 headlight look of the 69's. I also like the shakers on the 70's.
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Offline EricDickerson

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Re: boss values and difference between 1969 and 1970 model
« Reply #24 on: September 20, 2011, 10:08:35 pm »
I don't know if there was any difference in performance between the two years but The 69 crank should be lighter being crossdrilled with hollow throws so, I would think with less recipicating weight the 69 would wind up quicker. I'm with supershifter2 on the 4 headlight look of the 69's. I also like the shakers on the 70's.

The 70's are definately quicker, and particulary the Gold Metallic 70's. This is just an un-biased opinion of mine.  ;D
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Offline Team Sho-Air

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Re: boss values and difference between 1969 and 1970 model
« Reply #25 on: September 20, 2011, 10:37:46 pm »
Love them both, lucky enough to own both...................69's in general sell for about 20% more on average. If you want something real rare....................purchase a 1970 Boss 302 Cougar Eliminator production around 450 or a 1969 Boss 302 Cougar Eliminator production around 165......................... I think these cars are on the up and i will be selling my "Fully restored Numbers / Date Code correct 1970 Pastel Blue Boss 302 Cougar Eliminator (fully restored by expert builder Kenny at Mascar Auto) either privately prior to Barrett Jackson Scottsdale or at the auction. The car will be ready to be viewed in the next 30 days, its Pastel Blue with vary rare Blue int.
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Offline Boss302Fan

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Re: boss values and difference between 1969 and 1970 model
« Reply #26 on: September 21, 2011, 07:22:10 am »
Not sure if I agree on a 20% hike for a 69... I think it comes down to the individual B2, and today I believe it really does not matter if it is a 69 or 70. Not every B2 is of the same originality or quality...

A restored car is great but once it is driven the value goes down.

Going forward, I believe the more authentic and original a car is, the higher the value...

Offline BOSS-STANG

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Re: boss values and difference between 1969 and 1970 model
« Reply #27 on: September 21, 2011, 11:32:36 am »
Quote
EricDickerson wrote:
 The 70's are definately quicker, and particulary the Gold Metallic 70's. This is just an un-biased opinion of mine.

Your full of prune juice. 70 Grabber Green B2s are way faster than those peg leg sled 70 Gold Metallic B2s. :D :D :D


Offline JRGBOSS

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Re: boss values and difference between 1969 and 1970 model
« Reply #28 on: September 21, 2011, 11:41:12 am »
Regardless of color it has been scientifically proven that shaker B2s are able to obtain greater velocities than non-shaker B2s. ::)
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Offline TXBoss302

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Re: boss values and difference between 1969 and 1970 model
« Reply #29 on: September 21, 2011, 12:00:39 pm »
69's are faster... cause the four headlights helps them see better.
69 Yellow Boss 302... Back to not done.... Now back to almost done. Again.