69' amx - Page 3

Jeff Lee · 06-26-2010, 04:42 PM

Good point to Paul about the head bolts. The 1970+ blocks / heads were a 1/2" head bolt while the 1969- blocks / heads were a 7/16" head bolt. Putting the 1970 heads on the 1969 short block would have required reducer bushings in the heads or drill / tap to the block.

mike withers · 06-27-2010, 08:32 AM

Tom is right the 69ss/amx was for many years was the most factored. factory rating 340hp NHRA factor 420hp a 80hp increase the hemi's went from 425 to 500hp a 75hp increase. The 69 factory ss/amx now has 407hp rating.

Paul Ceasrine · 06-28-2010, 09:08 AM

Jeff,
Article in 1970 Car Craft, mentions that the over-all length of the
70' AMX (longer than the 69') with the newer nose, was the big issue with the NHRA, not the new head conversion (if performed). They were convinced (it doesn't mention names) that it would be protested, because of aerodynamics. As you know, the 70' AMX car was 1" lower (newer front-end suspension changes) and 2" longer (extended front-grille and hood) than the 69' AMX car.

Ozzie,
In 68' the AMX was available with other engines, not only the 390/315HP
engine.
The 343/280 HP and the 290/225HP were both available in the first year run AMX.
In 68', the AMX; NHRA class; (390/315HP; #3163 lbs.= E/Stock), (343/280HP; #3096 lbs. = G/Stock).
For some reason, a lighter weight was factored for the 290/225HP AMX (#2836 lbs. = J/Stock)
Not the currently listed #3096 lbs.
Also, the 68' Javelin SST 290/225HP was also classed in J/Stock.
I think the listed weight has since changed.

In 69', the 68'AMX 390/315HP ran in F/Stock, or SS/J (see; Ross Gilbert)
Paul

Paul Ceasrine · 06-28-2010, 04:15 PM

Ozzie,
I'm not sure, but I think the 69' AMX was lighter than the 68' AMX.
Not sure why? I thought they were the same and one?
I'll check, but if your correct, than in 69', the 69' AMX 390/315HP ran in E/Stock and the 68' AMX 390/315HP ran in F/Stock.
PC

The guidelines list the 69' AMX 390/315HP at #3048 lbs. (-115 lbs.) lighter than the 68' AMX 390/315HP, so it would be classed one class lower.
Though the 69' AMX 343/280HP and 290/225HP cars are listed with almost the exact weight. I'm lost!
The S/S car is also listed at #3048 lbs.
There has to be some error.. As for other classificatiions, I know for a fact that we ran against a 68' or 69' Javelin SST in 1969, in K/S (12.50-12.99 wt/hp)
Ran against him the whole summer.
The current weight/hp factors don't compute, but I'll figure it out.

Paul Ceasrine · 06-29-2010, 08:54 AM

Ozzie,
It must be an error in the AMX weight listing.
The 68' and 69' 390/315HP weighed in almost exactly.
In 68', the car would be classed in E/Stock, and in 69' the car would be classed in F/Stock, and/or SS/J.
As for the 290/225HP engine. One listing has the Javelin SST
with a weight of #2836, which equates to K/S (12.50-12.99 wt/hp) in 1969, like I said.
There are some refrences, that show the 290 (N-code) engine with a
235HP rating, in the AMX, but 225HP in the Javelin.
Not sure if there were any differences, maybe in the exhaust system?
In any event, the old listing shows the 68' AMX 290 engine with a
weight of #3046 lbs. If they factored it by 235HP, it would also be classed in K/S in 1969.
PC

06-26-2010, 04:42 PM	#21
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 2 Times in 2 Posts	Re: 69' amx Good point to Paul about the head bolts. The 1970+ blocks / heads were a 1/2" head bolt while the 1969- blocks / heads were a 7/16" head bolt. Putting the 1970 heads on the 1969 short block would have required reducer bushings in the heads or drill / tap to the block. __________________ Jeff Lee 7494 D/S '70 AMX

06-27-2010, 08:32 AM	#22
mike withers Junior Member Join Date: Dec 2007 Posts: 67 Likes: 4 Liked 3 Times in 1 Post	Re: 69' amx Tom is right the 69ss/amx was for many years was the most factored. factory rating 340hp NHRA factor 420hp a 80hp increase the hemi's went from 425 to 500hp a 75hp increase. The 69 factory ss/amx now has 407hp rating. __________________ Mike Withers 1195 SS

06-28-2010, 09:08 AM	#23
Paul Ceasrine VIP Member Join Date: Apr 2009 Posts: 2,546 Likes: 0 Liked 10 Times in 10 Posts	Re: 69' amx Jeff, Article in 1970 Car Craft, mentions that the over-all length of the 70' AMX (longer than the 69') with the newer nose, was the big issue with the NHRA, not the new head conversion (if performed). They were convinced (it doesn't mention names) that it would be protested, because of aerodynamics. As you know, the 70' AMX car was 1" lower (newer front-end suspension changes) and 2" longer (extended front-grille and hood) than the 69' AMX car. Ozzie, In 68' the AMX was available with other engines, not only the 390/315HP engine. The 343/280 HP and the 290/225HP were both available in the first year run AMX. In 68', the AMX; NHRA class; (390/315HP; #3163 lbs.= E/Stock), (343/280HP; #3096 lbs. = G/Stock). For some reason, a lighter weight was factored for the 290/225HP AMX (#2836 lbs. = J/Stock) Not the currently listed #3096 lbs. Also, the 68' Javelin SST 290/225HP was also classed in J/Stock. I think the listed weight has since changed. In 69', the 68'AMX 390/315HP ran in F/Stock, or SS/J (see; Ross Gilbert) Paul Last edited by Paul Ceasrine; 06-28-2010 at 03:44 PM.

06-28-2010, 04:15 PM	#24
Paul Ceasrine VIP Member Join Date: Apr 2009 Posts: 2,546 Likes: 0 Liked 10 Times in 10 Posts	Re: 69' amx Ozzie, I'm not sure, but I think the 69' AMX was lighter than the 68' AMX. Not sure why? I thought they were the same and one? I'll check, but if your correct, than in 69', the 69' AMX 390/315HP ran in E/Stock and the 68' AMX 390/315HP ran in F/Stock. PC The guidelines list the 69' AMX 390/315HP at #3048 lbs. (-115 lbs.) lighter than the 68' AMX 390/315HP, so it would be classed one class lower. Though the 69' AMX 343/280HP and 290/225HP cars are listed with almost the exact weight. I'm lost! The S/S car is also listed at #3048 lbs. There has to be some error.. As for other classificatiions, I know for a fact that we ran against a 68' or 69' Javelin SST in 1969, in K/S (12.50-12.99 wt/hp) Ran against him the whole summer. The current weight/hp factors don't compute, but I'll figure it out. Last edited by Paul Ceasrine; 06-28-2010 at 04:29 PM. Reason: add-on

06-29-2010, 08:54 AM	#25
Paul Ceasrine VIP Member Join Date: Apr 2009 Posts: 2,546 Likes: 0 Liked 10 Times in 10 Posts	Re: 69' amx Ozzie, It must be an error in the AMX weight listing. The 68' and 69' 390/315HP weighed in almost exactly. In 68', the car would be classed in E/Stock, and in 69' the car would be classed in F/Stock, and/or SS/J. As for the 290/225HP engine. One listing has the Javelin SST with a weight of #2836, which equates to K/S (12.50-12.99 wt/hp) in 1969, like I said. There are some refrences, that show the 290 (N-code) engine with a 235HP rating, in the AMX, but 225HP in the Javelin. Not sure if there were any differences, maybe in the exhaust system? In any event, the old listing shows the 68' AMX 290 engine with a weight of #3046 lbs. If they factored it by 235HP, it would also be classed in K/S in 1969. PC