327 Cam and parts redo ????

bdcole_51 · Nov 3, 2005

Hey Guys I have A 68 with a 327 - 275 hp that has been built a little but the problem is I don't know what was done to the engine.Right now it has a pretty good sized cam in it but I don't know the brand or specs to it ,a weiand intake on it, headers ,a 350 turbo tranny with a manual valve body ,small converter ,an 8.5'' 342 posi gear in it, Edelbrock 600 carb,shift kit, I just put a new Mallory Unilite distributor,coil,and wires in it and the thing still has a slite miss in it.
I want to get your input on some things that I want to do to it to see if it makes it a lot stronger and more drivable,first I am changing the Intake and carb to an edelbrock performer RPM intake and a 650 dual line vacuum secondary Holley carb and I have a nice set of chevy 186 heads but they are 194's and while I have the heads and Intake off I would like to put in a good double roller timing chain,and I would like to get your thoughts on this paticular Lunati cam,its specs in the Jegs book are this, its a street master kit adv. duration 290/297degrees and a lift of 490,with an rpm range of 1500-6200 ,I also have power disc brakes on my car,does anyone have any thoughts to this cam and or combo please give me a little feed back Thanks Camaro BOB

Rogers Performance · Nov 4, 2005

Heads ,chain,intake and carb are fine but i would use a 600.What part # is the lunati cam.

pdq67 · Nov 4, 2005

Your motor will run great with no more than a good old CC 268HE or 270 Magnum, Crane/Cam Dynamics 272/272 Energizer, an Isky 270 Megha or a Crane 274h06 hy-cam! But imho, your motor will love a small 270 solid lifter cam like a 270 S Magnum OR the little old, stock Duntov, -097 cam!

AS long as you are right up around 10 to 1 CR!!!

AND imho again, a 290 cam need at least 10.5 and preferably 11 to 1 to run good in a 327 motor!

And a Holley 600 cfm, 1850 carb. on their 300-36 true high-rise intake along with a set of 1.625" four tube, long headers AND you are good to go!

pdq67

doverwht69 · Nov 4, 2005

I'm in a similar situation with mine. It is a 327, but outside of the cam, I really don't know what has been done internally. Mine has an Edelbrock Performer RPM cam(don't have the specs in front of me) and intake with a Holley 600 double pumper, camel hump heads, roller rockers and headers. I don't know my CR, but I'd guess it's around 10 or 10.5:1. It is plenty stout enough for me.
But, I'm old too. Sometimes my wifes Jeep seems stout.

Barry H · Nov 4, 2005

Re: PDQ, 327 Cam and parts redo ????

PDQ,

What does engine software say with the solid lift cams, say the Duntov and the 270S from Comp?

Please see the thread about the Edelbrock Heads vs. the vortecs for engine details.

What are the advantages of each? I see where you talk about these and I agree, but why? Was the cam in the 327/375HP engines, solid??

Thanks for your help, Barry.

Sorry I hijacked this thread, but they are related.

cradfordchevy1 · Nov 4, 2005

bdcole 51, What is the duration at .050" on that cam?

I think it is a pretty big cam, and I have a hard time believing that it is good from 1500 to 6200RPM. Seems pretty big, unless you have a high compressioned engine of 11:1 like PDQ says.

I have a smaller cam in my 327, it is a 10.5:1 CR and has quite a bit of power and it isn't tuned yet, which is probably going to be pretty hard to tune it until next summer because we have SNOW now.

But I have done a lot of research on this subject and I would listen to some of the old timers that have run these engines before.

You gotta love the 327"s.

The cam I have is a Lunati part # 401A6LUN

specs on the cam are:

276/284 advertised
243/251 at .050"
.518"/.530" lift
110 LSA.

greg moreira · Nov 4, 2005

Chris R, that lunatis gotta be pretty wicked in your 327. I guess thats what the 4.56's and the 4 speed are for! Definitely post more about that lunati cam just to see....but really, you can do better. Like pdq67 said, look into some of your cams in the 268 degree range. Especially with your gears you wouldnt want to go any bigger. A voodoo 262 would even fit the bill....the 268 at most.

bdcole_51 · Nov 4, 2005

You asked me what # the cam was and it is 638-07104LK in the new Jegs book if that helps you any.I got this cam # from a friend of mine who has 72 LT1 Vette and it really sounds right,that is how I like a cam to sound. But I dont know if this cam is to big for my engine ,,,Thanks for the input Camaro BOB

pdq67 · Nov 4, 2005

Crane re-pop's the great "-346"-"30-30"-"Fuelie"-"Z-28" solid cam and they suggest an rpm range of 4000 to 6800 rpm.AND with good springs, it will hit 8,000 rpm!!!

GM spec'ed it at 346/254, 114/112, .485"/.485" gross lift and it needs from .026 to .030" of lash!

Others say it is a 314/254 cam AND I think Pat K. say's it's a 304??

Whatever.

The -097 Duntov solid cam is 287/228/287/230, 110.5/108, and with .012" and .018" lash is right at .383" net lift or so? AND if I recall something like 3200 to 6400 rpm even tho the little bugger will go to 7,500 rpm easy with good springs! (Fwiw, Pat K. say's it is about a 272 cam if I recall right?)....

The Duntov was used in the hi-po 290hp(??) and 315hp/283 FI motor and the 340hp, 2x4 carb./327 and 360hp/327 FI motor that only had 1.94"/1.50" valve double-hump heads. Whereas the 350/365hp carb'ed and 375hp327 FI motors and the Z-28 got the 2.02"/1.60" valve double-hump heads

GM got the little 327 motor almost DEAD-NUTS right when they made the hy-po ones so this is why even the 275/300/340/350/360/365 and finally the 375hp jobbers run SO GOOD, imho.

That said, you have to match cams to right at 10 to 1 CR to be able to run pump gas in one nowadays which is generally a 270ish cam either spec'ed solid OR hy-! (BUT with matching ACTUAL timing spec's!!)...

I like the solid cams b/c I wrapped the little old Duntov up above 7,000 easy in my junk301 years ago whereas the hy-cams give out around 6,000 to 6,500 rpm due to lifter pump up float! AND the shorter stroked SB's love to rpm IF you have GOOD valve springs AND that means like the stock Z-/-142/LT1 type!! OR what the cam maker recommends!!

No biggie whatsoever to me! Especially since a set of Z-/-142 springs sell for like $25 to $35/set or so!! CHEAP, IMHO!!

Check Midwest Motorsports, Competition products and Powerhouse out for up to date prices??

This is why I'm gathering parts for another old junk292/301 motor, but this time, 8,000+ rpm!! Just for old times sake.........

pdq67

PS., AND I figure a .030" over, 400 with a 327 crank will run like a "scalded-dog" too!!

cradfordchevy1 · Nov 4, 2005

Greg Moreira,

The cam seems to be pretty good so far, but ounce I have the engine broke in and can really RPM it than I will know how it runs.

I would of put a smaller cam in the 270 range in, but I couldn't because it would give me too high of a dynamic CR. The block is zero decked and flat top pistons. I guess I would have to change a few things to be able to run the smaller cam.

Ounce I can run the car again and get it tuned in I will let you know how it runs with my cam. Now I can't wait until next summer to really tune it in.

greg moreira · Nov 5, 2005

I wasnt saying that lunati solid is too big for your motor....just commenting on the fact that it should be pretty rad. With your static compression ratio, gearing and that 4 speed, its a good match as long as youve got some descent heads to go with it cause it will be capable of some revs. I agree with you. If you were to stab in a smaller camshaft, youd need to make some changes. The gears would be overkill for a smaller cam and youd want to be pretty careful with that comp. Give it a shot as is for sure. As long as it doesnt bother you to drive, it will be a good runner. Just curious though, what size chambers are on your heads? 10.5:1 is a lot of compression for a flat top 327.....the typical flat top in a 350 wont make that much comp with a 64cc heads.....so Im assuming you either have plenty small chambers, or maybe flat tops with no releifs.....or less comp that you figured. Just curious.

Back to the original lunati cam. Ok, here are all the specs on that cam guys.
Specs are:
Intake valve gross lift/duration: .490"/290°
Exhaust valve gross lift/duration: .490"/297°
Intake valve duration @ .050": 235°
Exhaust valve duration @ .050": 240

Look at the .050 duration...its 235 degrees intake. This is about what I was expecting. This is one of the older school camshafts with lazier lobes. Its got 290 degrees advertised duration with 235 degrees .050. For comparison sake, the voodoo 268 has 268 degrees advertised and 227 degrees .050.

So, the lunati cam you are looking at has 22 degrees more advertised duration than the voodoo 268, but only 8 degrees more duration at .050. Thats because the voodoo lobes are more aggressive....better for building power. If you wanted, you could step up to the healther 276 but thats pushing it. Its numbers are 276 advertised with 231 at .050. Once again, compare the numbers to the first cam. Almost the same .050 with a lot less advertised duration cause the lobes are more aggressive and the lift curve on the voodoo sports bigger, better numbers.

With your gears, you wouldnt want to really go big on the cam. The voodoo 268 isnt much smaller of a cam and will still sound real healthy in a 327. Wouldnt surprise me if it was faster than that 290/297 cam either. Its all in the numbers.

cradfordchevy1 · Nov 5, 2005

Greg moreira,

The reason I got this compression ratio is because I got the heads machined down to 58cc. Thats how I brought my compression ratio up.

327 Cam and parts redo ????

bdcole_51

Rogers Performance

pdq67

doverwht69

Barry H

cradfordchevy1

greg moreira

bdcole_51

pdq67

cradfordchevy1

greg moreira

cradfordchevy1

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