Whats it all mean???

[ironman_gq]

looks pretty similar but mine has a exh open of BBC 42 not 44. dont know how much difference this makes but the PN is the same.

[ironman_gq]

Do engle cams come as a kit or are lifters seperate. If seperate what lifters would be best? performance for the money wise.

[82Waggy]

Is that the Clevite CAM 1980_CJ7 used in his 401 build
that hosed the pistons because the builder incorrectly installed
the cam gear on the oil passage instead of the keyway ?
The intake closing angle is early and increases dynamic CR ?

At .006 tappet lift and 105 degrees intake lobe centerline:

Engle35018 Intake closes @ 49deg ABDC,

Clevite #1 Intake closes @ 61deg ABDC.

I think 1980_CJ7 was using clevite #2, which has an even later intake closing point.

Yes, the earlier the intake closing point, the higher the dynamic cr.

Be sure to match up intake lobe centerlines when comparing valve timing.

PS: BTW there is still plenty of flow through the valves at low rpm at less than .050 lift to lower dynamic CR. When considering bottom end performance (torque) I always look at the .006 figure, and use the .050 figure to get a feel for high rpm performance. The less duration at .006 with the most duration at .050 gets you closer to the best of both worlds (Called "Hydraulic Intensity" by Harvey Crane). The abilty to lower this difference is one of the great advantages of the AMC engine with its' large diameter lifters. Unfortunately, many flat tappet cams are just Cheby grinds in AMC clothing.

[82Waggy]

I also want to remind everybody, before I get flammed to death , that when I open my big mouth with a cam recommendation it is based upon what the originator of the question says he has and what he wants to do with it. In this case I think the Engle 35018 will smoke that Clevite all around, but that is not to say that it is necessarily the best choice for every situation.

[1980_Cj7]

Yep, we used the number 2 cam on that Clevite chart, part no. 229-1972. I think we're gonna stick with it and see what it will do when it is timed right. We got the Roll Master timing set this time, so we'll have plenty of adjustability. Gonna put a degree wheel on it this time and make sure it's right.

I sent all our specs to Keith Black, and one of their experts ran the numbers and said we should be OK with pump gas, but would most likely need to run 93 octane. (We're using their KB 354 pistons this time around, for anybody who hasn't been following the saga from hell, ha, ha.)

[AMX69PHATTY]

So like jeepsr4ever said, not making power until 3000 rpm right ?
A little "much" for his 304 motor on the low end ?

[1980_Cj7]

So like jeepsr4ever said, not making power until 3000 rpm right ?

Hard to say. Ours wasn't running long enuff for us to get the bugs worked out and get the carb tuned in and everything set up right. We were having a devil of a time with the ignition timing too as you can imagine what with the screwed up way the cam was installed.

Seemed to be OK on low end though. Tried power braking once and it would drive thru the rear brakes and pick the front end up and slide the front tires...even with the 1 ton brakes and hydroboost.

[82Waggy]

So like jeepsr4ever said, not making power until 3000 rpm right ?
A little "much" for his 304 motor on the low end ?

Well, I would expect the clevite to peak later in the rpm range with a lower overall torque figure. The originator of this thread said he did not feel like it started to pull until 1500 rpm. A cam with a wider LSA may not exhibit much of an actual peak as they tend to make a relatively flat torque curve and hang on longer in the rpm range.

donwags 401 showed only a 28ftlb variation from 2000-4400rpm on the dyno sheet using 256SAE intake duration and a 110 LSA (9:1cr). The curve with a 112LSA would likely be flatter still.

[dwg86]

I had reed cams grind me a cam for my 401. They have been around awhile and have experience with amc cams. I saw an oil article in a hotrod mag where they ground the cam for the build. Anyhow when I talked with them about lift/dur for an amc cam, the guy I talked to said that amc engine like a split lift/duration cam more lika a ford cam. He also stated that the lift on amc cams are higher as compared to a chevy cam. Also with the lifter dia. being big you can get get a little more aggressive with valve opening and closing. My cam specs where int/exh 228/232 dur @.050 lift 512/518 110 deg centerline with 3 degrees advance ground into the cam. www.reedcams.com . Just wanted to give another cam option/supplier. They will grind whatever you want.

[dwg86]

sorry for the typo OLD article