What a Comp Cams Magnum 270 sounds like in a 440

[moparedtn]

Figured some of you would like to hear what this relatively mild cam sounds like in a 440. I posted these videos on my thread titled "Collapsed Lifter", but figured nobody would see the end result there.
This is the Comp Cams Magnum 270 cam. 270 advertised duration, 470 advertised lift:
Break-In (approx. 2000 rpm)
https://www.youtube.com/watch?v=3rM3lxoIFk0

Idle:
https://www.youtube.com/watch?v=KD_t5uN-YYE

Cam makes a little lope and a LOT of vacuum. Very mild and it took to tuning right away.
I think I'm going to be able to swap out the power valve back to the stock 6.5 and the main jets back to 72's now, in fact. Thoughts?

 

[a68postcar]

cool. I like it. any vacuum you can get is good. I probably wouldn't back up too far and possibly effect performance. runner, that's what I say, get it? pun pun pun.......

 

[moparedtn]

cool. I like it. any vacuum you can get is good. I probably wouldn't back up too far and possibly effect performance. runner, that's what I say, get it? pun pun pun.......

I hear ya.
Probably going to try to revert the Holley to stock configuration just because I've had luck in the past with them right out of the box on near-stock 440's. In any event, it will give me another reference point in tuning the thing.
Maybe somewhere between the two is where it will wind up?
Just glad to have the car to this point so I CAN play with tuning and such.

 

[69a100]

What made you decide to go with that vs. a split pattern cam?

 

[super-bee_ski]

Very cool!
Sounds great at idle.
Again very cool sound!
Nice choice with the CAM!

Also: Great Car!
Your fortunate the "owner of the car" is happy!
(Happy wife=happy life)

Thanks for posting this!

 

[Phil McGrath]

Who needs vacuum with a 4spd and manual brakes? Sound pretty tame but I've always liked the aggressive sound of the old grind .509 or .484

 

[moparedtn]

What made you decide to go with that vs. a split pattern cam?

A couple of board "regulars" had made some suggestions on cams and if Summit had the XE in stock,
I probably would have gone with something a little more aggressive & split pattern.
Summit thought they had this one on the shelf (turns out, they didn't and had to get it direct from
Comp Cams anyways).
This last weekend was my window of opportunity to get this done before I had to be back in hospital
again, so I wound up with this one after conferring with Comp Cams' tech line.
Easier to tune also was another point in its' favor.

- - - Updated - - -

Very cool!
Sounds great at idle.
Again very cool sound!
Nice choice with the CAM!

Also: Great Car!
Your fortunate the "owner of the car" is happy!
(Happy wife=happy life)

Thanks for posting this!

Thanks, Ski. Much appreciated, sir.
Got that right. Mama gotta be happy
That was her first time cranking the car up. She's the one that picked the car when we started this whole trip over 4 years ago and she's been through hell with me and all my health issues since then.

She's never fussed about all the parts fetching and trevails I've been through resurrecting the GTX, not to mention all the hell of my going through cancer 3 times and croaking on her a couple more times.
I'm one lucky boy.

- - - Updated - - -

Who needs vacuum with a 4spd and manual brakes? Sound pretty tame but I've always liked the aggressive sound of the old grind .509 or .484

I've mentioned several times in other threads that the previous owner had supposedly rebuilt the engine, including installing a 509 purpleshaft cam, a personal favorite of mine in decades past.
Well, the car would never behave right with that 509 and was hell to tune. Never could figure out why until I finally discovered a collapsed lifter recently. When I tore the top end down and pulled the cam, it had wiped two lobes and pretty much eaten two lifters up - with only a few hundred miles on it.

That pretty much precluded me from buying another Mopar cam right there.

 

[a68postcar]

Who needs vacuum with a 4spd and manual brakes? Sound pretty tame but I've always liked the aggressive sound of the old grind .509 or .484

I agree with this statement. the .509 was a great cam. but I had more driveability with the .484.

 

[moparedtn]

I agree with this statement. the .509 was a great cam. but I had more driveability with the .484.

...and if the .509 had actually lived in mine, I'd have happily kept it....but it didn't.

Not wanting to do this job twice, I probably erred on the side of caution and chose not to use another Mopar cam, much as it pained me to do so.

 

[Phil McGrath]

...and if the .509 had actually lived in mine, I'd have happily kept it....but it didn't.

Not wanting to do this job twice, I probably erred on the side of caution and chose not to use another Mopar cam, much as it pained me to do so.

Sorry too here your 509 didn't live a long life, mine lived for 15 years and was in the car when I sold it. I've heard that some of the Purple Shafts have had soft cores, todays oil doesn't help either.

 

[moparedtn]

Speaking of oil, I gotta get some pretty quick here soon. My head is dancing with specs on ZDDP or whatever it is and fears of putting off the shelf stuff in there and wrecking all my work. I'm even questioning leaving the windage tray in the pan...

 

[GearAddict]

Sounds good... I'm looking forward to hearing how your tuning efforts go as I am in the same boat (.509 cam, luckily not wiped) but looking for something a little less radical, better vacuum and easier to tune.

On a separate note... in vid 1, right at the end it looked like your #3 or #5 Cyl plug wire was arcing to the exhaust manifold? It was hard to make out, could have been something else, but you might want to take a look.

 

[moparedtn]

Sounds good... I'm looking forward to hearing how your tuning efforts go as I am in the same boat (.509 cam, luckily not wiped) but looking for something a little less radical, better vacuum and easier to tune.

On a separate note... in vid 1, right at the end it looked like your #3 or #5 Cyl plug wire was arcing to the exhaust manifold? It was hard to make out, could have been something else, but you might want to take a look.

Wow, it does doesn't it? The smoke was a drop of residual oil hitting the header, but I see that little blue flicker something or other too. Weird, because there's no cable near that part of the header.
Now I got another mystery to figure out.

This cam develops almost 15hg of vacuum. I was shocked at that.

EDIT: Went and checked on the car. That's a loose end of tape wrap on that old positive battery cable flapping in the breeze, looks like. That cable is getting replaced this weekend, in fact. The other blue thing you see in there is the top of the shock.

 

[GearAddict]

Wow, it does doesn't it? The smoke was a drop of residual oil hitting the header, but I see that little blue flicker something or other too. Weird, because there's no cable near that part of the header.
Now I got another mystery to figure out.

This cam develops almost 15hg of vacuum. I was shocked at that.

EDIT: Went and checked on the car. That's a loose end of tape wrap on that old positive battery cable flapping in the breeze, looks like. That cable is getting replaced this weekend, in fact. The other blue thing you see in there is the top of the shock.

Glad you figured it out... sorry for the false alarm.

 

[moparedtn]

Glad you figured it out... sorry for the false alarm.

:icon_thumleft:

 

[Officer Higgins]

Sorry too here your 509 didn't live a long life, mine lived for 15 years and was in the car when I sold it. I've heard that some of the Purple Shafts have had soft cores, todays oil doesn't help either.[/QUOTi recently spoke with a prominent mopar cam profile designer who has cams made by engle he said the mopar performance purple shafts are on a chevy lobe design.

 

[69 GTX]

Sounds & looks good! Love the buddy seat!

 

[Officer Higgins]

Mopars are just plain cool

 

[Brandy]

Thanks, now I have an idea what mine will sound like with .030 over, ported and polished heads and gasket matched intake, M1 single plane, 750 dual feed, and a Comp 306-4. 270/470. through 3 pipes and #40 flow masters.

 

[moparedtn]

Ummm....not sure why this thread got resurrected?
Y'all know this engine wound up going bye-bye, right?