318 six pack cam help

[440marv]

Looking for a new cam for my 318 . This motor was in the car when i got it
so i dont know everthing about what it has but i will tell you what i do know.
performer cam
360 j heads
six pack setup
273 adj rockers
hedders
727 auto
2400 rpm stall
3.55 gears
Also i did a compression test and it has 165 -170 psi
Any help would be great .

 

[340 8BBL]

there are a few factors to consider.is this going to be a daily driver?and idle quality is another.i tend to torture myself over this subject due to the amount of options to pick from.i ran a schnieder 284h in a very similar set up.284/224@50 480 lift 108 lsa.it had very lopey idle.throttle response was excellent.it pulled really hard from 2000 to 5800.mine was not a daily driver,and it was a single 4bbl.a 110 lsa might be better for street manners.i have several small block cams on the shelf if your interested.

 

[440marv]

It is not a daily driver just a weekend and summer toy.

 

[stroked 340]

six pack on a 318.. i think you'd be much better off with a small 4 barrell carb.talk about over carbing a motor..

 

[cannucky]

I run the comp xe-268-h on my 318 {only a 600cfm 4bbl} and it pulls nice and sounds real good but then it depends on what you like

 

[rumblefish360]

six pack on a 318.. i think you'd be much better off with a small 4 barrell carb.talk about over carbing a motor..

I don't agree with that statement. I knew 2 guys with that set up. While I'd rather a 4bbl. myself, the total cfm of the 6pak carb set up is a 2bbl. rating of way to much but converted to a 4bbl. it's a big 4bbl. I forget what the conversion worked out to be. IIRC (I'm laffin at that so you know) it worked out to be like a 780 cfm's.

Looking for a new cam for my 318 . This motor was in the car when i got it
so i dont know everthing about what it has but i will tell you what i do know.
performer cam
360 j heads
six pack setup
273 adj rockers
hedders
727 auto
2400 rpm stall
3.55 gears
Also i did a compression test and it has 165 -170 psi
Any help would be great .

I would certainly use the 273 rockers with a mech. cam of about 230 on the intake durtaion @ .050.

Hummm, try a XS282S. It's a 2000 - 6000 rpm cam. I think it'll fit right in there well.

 

[stroked 340]

I don't agree with that statement. I knew 2 guys with that set up. While I'd rather a 4bbl. myself, the total cfm of the 6pak carb set up is a 2bbl. rating of way to much but converted to a 4bbl. it's a big 4bbl. I forget what the conversion worked out to be. IIRC (I'm laffin at that so you know) it worked out to be like a 780 cfm's.



I would certainly use the 273 rockers with a mech. cam of about 230 on the intake durtaion @ .050.

Hummm, try a XS282S. It's a 2000 - 6000 rpm cam. I think it'll fit right in there well.

When all 6 barrells open your talking what 1100 cfm's..way to much for a little 318...sure it'll run ,but run properly??..a 4-barrell properly tuned will out run it any day...

 

[440marv]

It's only 22ci smaller than the 340 why would it be over carbed ?

 

[340 8BBL]

i have to agree with rumble on the six pack.i run 2 4bbls on my 340 and it works fine,granted they are small.

 

[dodge freak]

six pack on a 318.. i think you'd be much better off with a small 4 barrell carb.talk about over carbing a motor..

I did better yet, put 2 4bbl Carters on a 318 :-D

Wish I did it this spring when I first got the intake.

You figure a .030 over 318 is about 323 CI only 22 CI less than a 340 and 4 CI less than a 327 Chevy. Plus in the late 60's racers would de-stroke a 340 to 305 CI so it pass the rules limiting displacement and could rev to 8000 rpms no problems. Some ran 8 Webers back then.

 

[rumblefish360]

When all 6 barrells open your talking what 1100 cfm's..way to much for a little 318...sure it'll run ,but run properly??..a 4-barrell properly tuned will out run it any day...

Remember the difference between how 2 and 4 bbl. carbs are rated.

 

[dodge freak]

When all 6 barrells open your talking what 1100 cfm's..way to much for a little 318...sure it'll run ,but run properly??..a 4-barrell properly tuned will out run it any day...

Yeah that is it..when all 6 barrells are open all the way...expect if tune right they may not be until 6000+ rpms.

A 6 pack wows the chicks better too 8) and can get a bit better mpg...as for flat out...it depends on the tune...6 pack is harder to tune but done right it be closer than you think. And if the motor was built right for 7500 rpms might even make a bit MORE power at 7000+ rpms.

But most run them for show...even if they run 3-4 car lengths slower in the Q mile (which the most it should be slower)

 

[1967DartGT]

Why is it that after 440marv asked about cam advice, everyone decided to argue about his carb choice or engine choice?

If you want to go with hydraulic lifters, I agree with cannucky that the Comp Cams XE-268-H sounds like a good cam for your combo, it should have plenty of torque and be very streetable. It is rated for 1600-5800 rpm with a 2000 stall converter in a 318. You might be able to go up to a XE-274-H with your 2400 stall converter if you want something a little more agressive sounding. Comp rates this from 1800-6000 rpm and recommends a 2200+ stall.

If you want to go with mechanical lifters, Comp lists the 270S for 1800-5800 rpm with a stock converter or the XS-268-S for 2000-6000 rpm with a 2500 converter. Both of these solid lifter cams are shown for use in a 340 or 360 so the 270S might be the better choice for a 318.

 

[rumblefish360]

Why is it that after 440marv asked about cam advice, everyone decided to argue about his carb choice or engine choice?

Ahhh, I won't say I'm arguin with anybody, just giving a "IMO" and stoked340 has a point of view. No biggie from my eyes. Also, no issue with cube size. More is merrier, but sometimes, it's just not in the cards.

I think good points about the 6pak's use have been mentioned and the advice of a 4bbl. being better has merit, but then again, 440marv has it on top and that's what's staying there until he decides different. It's doable with work, just like any other carb. Opinions can fly, but Marv just needs to tune it in to his car and engine combo.

 

[440marv]

What do you think of the lunati voodoo cams ? I friend of a friend has a new
60403lk kit a can get for $100.

 

[dodge freak]

Good cams, the biggest I would run with your gear and converter. I go for it if that $100 includes lifters.

Edit..oh yeah LK kit, duh

 

[rumblefish360]

I'd jump all over that Lunati.

 

[1967DartGT]

That Lunati sounds similar to the Comp XE268H and I'd snap it up. Very good price. But remember that you will need new pushrods if you go with a hydraulic cam with your mechanical rockers (but you might already have them if you have a performer cam in it now).

 

[440marv]

Thanks for all the input I am going to pick up the voodoo cam tonight.