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They are still a little noisy compared to regular rockers. I'll be adjusting them next week and see if that makes any difference. You only really notice them with the hood open and it idling. The engine seems to like the combo, it has a ton of torque and revs well.

MediceMfg ...Valve Cover Spacers - Mopar Expensive but it will do the job! Top is for Magnum and bottom is for LA motor

CC one chamber in each X head, you'll then know the chamber size on them. After you replace the old heads clean a chamber and cc it. I bet they are within 2 cc's of each other. The ported heads will be a improvement!!!!

Here are some pic of the heads and the intake layout. Some pics of the intakes that are available for it> Notice the intake runners are very different..

No vacuum line on the pcv valve, is the port on the carb for it sealed?? Run the vacuum hose to the pcv and adjust the idle screw itt should straighten the idle out

About 125.00 plus shipping. Give them all the specs and you'll like the results.

I built my motor on that block, sent the can to Bullet racing cams and had it reground, I used magnum heads and new rods and pistons. That should have a block off plate where the fuel pump goes. The cam has a long snout for the concentric. I used factory lifters, Eatons I believe. It's a great...

There was a thread with this link earlier, pay attention to the o ring seal comments I lost one on my 318 dart years ago. It was a fram!

I'm watching this, mine does the same thing. I have a steady 18" of vacuum at idle. I figured I had a bad PCV, although it's new.

Epoxy a blank in it, Bolt a fender washer in, Tap and use a threaded plug. I would try to thread it and use a threaded plug.

I just thought I'd mention one more thing, the harmonic balancer should have the correct timing marks. My new one had 2 timing notches, I painted a white mark on the correct one to avoid confusion. It looks like they had marked for either timing chain cover.

Sorry, I couldn't help it...

66/67 273 closed chamber heads will work fine!!!!! They are the same casting on early 318's. Bolt them suckers up with the thinest head gasket you can find and enjoy your ride.

OK, box cleared

I really don't know, the machine shop picked them out. I got the guide plates from Edelbrock If I remember right. We used 7/16th studs for the rockers, the machinist thought it was a good idea. It's a mild roller cam but the open spring pressure is 320#s. I hope that helps. I used the regular...

Here are a couple of picsof my heads. I used push rod Guide plates which aren't on the mock up pics. It's been 2 years now with no problems. I don't really push the motor that hard, it runs nice. They are slightly noisy, I've heard it described " sewing machine sound".

One thing to try comes to mind, lock out the secondaries so it's only running on the primaries. See if that helps.

Does it idle ok? Intake leak???

Yeah, thats a little too hot. I spent a year in Vietnam and that kind of heat gets old quick. Went on R&R with a bunch of Aussies to Taipei, what a wild time. You guys know how to have a good time. Good luck with your build. Double check everything. My cam is a reground roller, seat pressure is...

Send me your credit card and I'll be right there!! It's getting cold here...LOL

When I installed my cam I used a degree wheel. It's a Bullet regrind on a 110 intake center line. It came in at 109 when I checked it, so I checked it 4 times. When I called them. Their answer was " good to go, it will make very little difference. This was a mild cam so lift wasn't a big...

The studs have a flange on the bottom. They are sandwiched between that flange and the head. You place the guide plate on the rocker tower, then screw in the studs thru the guide plate into the tower. Some alignment is necessary to center the roller on the valve stem.

Yes on my setup, but you can get those rockers in the magnum stem size too. I had mine drilled for 7/16th studs. The valve springs are 120 on the seat and 320 open. The machinist thought it was a good idea. I'm ironing out the bugs now but I'm impressed with the power and broad torque curve. One...

I used Chevy roller rockers, I'm trying to load a pic.

I had to, good luck finding a set that will fit. The oil baffles are the problem, I had to beat them into submission.

The 340 exhaust manifolds do fit but I had to double gasket them to get them to seal. The magnums are more expensive in that you either have to order them with the la intake pattern or get a Eddie intake. Yoe also need to get the correct pushrods, lifters and I had the studs replaced with...

I put a set of magnums on my LA360 and really like them. You need to get new pushrods and lifters, they oil through the rockers through them. The push rods will need to be measured to get the preload correct. The chambers are smaller, mine came in at 68cc's.

I'd be very tempted to pull a head off and see what it has for pistons and check the cam lift at the lifter.

If it was a balance problem it would not go away when you let off the gas, are you sure it isn't a bad misfire or plug wires switched??