Pure stock 340 Mopar

[mike coates]

Todd,
The cam specs come from the NHRA / IHRA engine specs. For the high compression 340's, the specs have the 330 ish duration. They don't match the "advertised" specs. I think Danny Waters Sr. may have the specs. Terry Bell used to have them, but I don't think he does anymore.
They have to be the old specs from before they removed the duration requirements, from like 20 years ago. I have them for the '70 340. I am not sure if they are the same for the earlier ones.
I have an ISKY stock grind that is around 348 @ .050. with .478 lift I think. It is the dwell nose type. The higher lift works because I run the stamped rockers and the ratio is off from the 1.5, so the actual lift at the valve is still a little short. It is supposed to be a good cam for a regular stocker, but I think it is too much for a pure stock. I run stock valve springs per the rules and I only get 6200 - 6300 rpm. If I were to get another, I would get one that works more to that rpm range.
Some time ago, I talked to the guy with the pure stock demon. I think he was only shifting @ 6000 and 4.56 gears and he was running around 12 flat. I don't know what his specs were. But as I said, I built my engine and I think he had someone build his. I know there are probably several items that could be improved on mine.

Mike

[GTX JOHN]

I WOULD GUESS only a few hundred between productionheaders of the two sizes.. I have run the Flowteck 1 5/8 from summit on 318 or 360 engine and they were not bad and only $119 at that time. Of course Mark's Perf. Welding are much faster than any mass
produced piece!

[Todd Boyer]

Originally Posted by GTX JOHN

I WOULD GUESS only a few hundred between productionheaders of the two sizes.. I have run the Flowteck 1 5/8 from summit on 318 or 360 engine and they were not bad and only $119 at that time. Of course Mark's Perf. Welding are much faster than any mass
produced piece!

John, did you run the Flowtechs in an A-body? I'm wondering how they fit?

[65signet]

Originally Posted by Todd Boyer

John, did you run the Flowtechs in an A-body? I'm wondering how they fit?

The flowtechs do not fit good at all, they hit the T bars and other places, i ran then on A body for about a year took them off and intalled Hooker super comps, the fit and performance is very good.

[Todd Boyer]

Originally Posted by 65signet

The flowtechs do not fit good at all, they hit the T bars and other places, i ran then on A body for about a year took them off and intalled Hooker super comps, the fit and performance is very good.

Thanks for that. You get what you pay for I guess. I used to run Hooker Super Comp 1 5/8 but sold them, they fit very well. What year of A-body did you run the Flowtechs on ?

[mike coates]

I have the 1 3/4" hooker supercomps on my dart swinger and they fit well. Better than the off brand 15/8 I used to run. I would think a 1 5/8 super comp would fit even better.
I really like to 2 piece design of the hooker. Makes it much easier to install.
Mie

[Myron Piatek]

The 1 5/8"-1 3/4" TTI step headers are the easiest headers I ever installed ina OEM chassis car.

[Todd Boyer]

Originally Posted by mike coates

I have the 1 3/4" hooker supercomps on my dart swinger and they fit well. Better than the off brand 15/8 I used to run. I would think a 1 5/8 super comp would fit even better.
I really like to 2 piece design of the hooker. Makes it much easier to install.
Mie

It was a set of 1 5/8 Hooker super comps that I just sold, they fit great. Did you pick up or lose anything with the switch from 1 5/8" to 1 3/4" Mike ?

[X-TECH MAN]

Originally Posted by mike coates

Todd,
The cam specs come from the NHRA / IHRA engine specs. For the high compression 340's, the specs have the 330 ish duration. They don't match the "advertised" specs. I think Danny Waters Sr. may have the specs. Terry Bell used to have them, but I don't think he does anymore.
They have to be the old specs from before they removed the duration requirements, from like 20 years ago. I have them for the '70 340. I am not sure if they are the same for the earlier ones.
I have an ISKY stock grind that is around 348 @ .050. with .478 lift I think. It is the dwell nose type. The higher lift works because I run the stamped rockers and the ratio is off from the 1.5, so the actual lift at the valve is still a little short. It is supposed to be a good cam for a regular stocker, but I think it is too much for a pure stock. I run stock valve springs per the rules and I only get 6200 - 6300 rpm. If I were to get another, I would get one that works more to that rpm range.
Some time ago, I talked to the guy with the pure stock demon. I think he was only shifting @ 6000 and 4.56 gears and he was running around 12 flat. I don't know what his specs were. But as I said, I built my engine and I think he had someone build his. I know there are probably several items that could be improved on mine.

Mike

I still have the Dodge specs up to around 1973. Dont forget that in Pure stock you are supposed to run the OEM type trans that came with the engine combo that you are claimming. No manual valve bodies either but I know of a few who are cheating and geting away with it using a 904 instead of the 727. Early 340's are suppposed to use a 727 Torqueflite and NOT the 904. No back cut on the valves either unless it was factory like the 455 SD Pontiacs and newer Vettes, etc. 99.9% of the current tech guys wont know the difference so if you have no morals go for it.

[mike coates]

Terry
I do run the 727, but have a manual valve body. When I was putting it together, there was a debate on this and I believe Dwayne said it was OK.
there was also a debate on the transmissions and at the time, it was worked out that if you ran a 904 (or any non original trans in other brands) you had to use the current HP rating, but if you ran the original (727, etc) you would get a 10 hp reduction for carbs (5 for FI cars).
Like I said earlier, I haven't raced for awhile so I don't know if anyone still uses this, but it was never made official and I still use the rated hp because of that. So I am at a disadvantage due to that....plus my valves are stock with no back cut...probably why I only run .1 to .2 under, among other things...
Mike