Thread: 327 Build Cam Selection

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When you start to cam up,you might have to consider a vacuum boost canister for vacuum accessories.

Pretty simple car I have...66 Nova, 2 door hardtop, no power brakes or air cond, etc...

Originally Posted by H.O.Rider

Is it possible the L79 intake will make more torque than either of those?
My engine builder thinks that intake is great for torque and HP bleow 5800RPM?? The cam show max HP @ 5500. I wasn't planning on spinning above 6000?

His thought was that if I wanted an aftermarket intake, that the Edlelbrock EPS was ideal up to 55-5800 on a 327??

Yes that EPS Performer would be best for max Torque and is Better then your L79 Intake . But is not the Best matched intake for Max Power with your 280H . And that L79 intake will be an under dog next to most Dual Plane After Market Intakes .

L79 Intake -> http://www.bigcitycorvettes.com/aw2k/LotImg18406

The out of date double hump heads are going to be the bottle neck to truly capitalize on the output of this 327.
And yes I know guys are going to say to port what you got.Fact is without a three dimension program backed by flow bench research and then cut on a 5 probe CNC porting you can not get the duplication you need from port to port no less head to head either with hand porting.With the CNC porting you can get to .2%.

So my point is the aftermarket heads market is because we found the shortcomings of the OEM stuff and with aluminum heads you could up the compression ratio somewhat along with having better flow numbers that match what a 327's power curve numbers that are in the upper RPM's.

yeah with that cam id go with the performer air gap since your cam range is max @5500 and with that you can run up to 750 cfm of carb without over fueling given your displacement, it's real similar to how i built my 327

I find it interesting when we start looking closely at the numbers of various cams. The 280 Sounds like such a big cam as compared to the XE268. With all being considered the XE line of cams are much bigger than their name implies.
I understand that they are dual pattern and that their name is implied from their seat to seat intake duration. While these two cams sound miles apart I am not sure they will act radically different. The exhaust specs are exatly the same. 280adv, 230 @ .050" with a .480" lift. The LSA@ 110 and intake centerline @ 106, are equal. Only the intake timing is different. Adv 280 vs. 268 and @ .050 of 224 vs 230. The intake lift is even equal(only .003" greater on the 280).The late intake closing is something I wanted, to get a touch less DCR. I understand the ramp profiles offer an advantage on the XE line to get great filling while according to some offering a disadvantage with wear and tear on valve train???

In looking at the old L79 cam specs, it had HUGE adv duration of somewhere between 305 and 320. Just slow ramps to get .221 @ .050" with a .447" lift. I was running this cam in this engine before the rebuild with much lower compression and horrible quench.

This stuff is semi-new to me. I just bought my 66 last year and have been out of the car scene since I was about 25. I am old now...lol @ 45. Enjoying playing with my car with my son and daughter. The internet can be a great tool and I have used it to help me build this engine. Trying to balance good power for my car and what we will do with it, reliablility, and sound while at the same time trying to keep it a 60's car with the original L79 intake, heads, carb, valve covers, and dual snorkel air cleaner. You could only get an L79 66 Nova with a 4 speed Muncie and a 12 Bolt Posi. I have both. Car is original Red on Red with a bench seat and correct 4 speed shifter.



I sure appreciate the help! Thanks and if I'm missing something, which I know I am, please let me know.

you have a flat hood ? can you get a air gap intake under the hood of a 66 .i have used more dcr then 8to1 with iron heads if quench is on the money

As for the Double Hump Fuelly Heads not being up to the task . Your talking an under 400 H.P Engine that He won't be running much over 5500 and the set he has are 2.02"in and 1.60" ex Heads . Can't see spending over a grand on a set of aluminum Heads for this build only to top it off with a Mild Performance intake . Yes if you have not Ported Heads don't try and do it with out someone there who has . It's an art form that take many years to Learn . Remember this them old Hump Head where used on Dragsters in the old days after being full Ported .

As for that 280H Turning off at 5500 I have had it in 350's that E.T-ed best when shifted at 6200 . No Dyno just Track Time Slips it will not turn off at 5500 if the rest of the build is up for the Task .

And that L-79 #151 Camshaft I have ran in all Kinds of SB's . G.M Measured it in a Different way on the adv dur .

Part # Lifter type--duration at .050 In/ex--Lift in/ex--centerline--description

3863151 Hyd. - 221/221-.447/.447-114 - 327-350HP, L79

Look at that 114 C/L Helps Top end and Idle but hurts Torque . The Later 350-350 H.P Camshaft is Much better .

Part # Lifter type--duration at .050 In/ex--Lift in/ex--centerline--description

3896962 Hyd. - 222/222 - .450/.460-114 - 350-350 , L-82


As for the 280H vs the XE268H You answered you own Question by shown the .050" 224 vs the 230 dur yes that will make the Difference as it shows in Low end Torque . Also on a street car with Full Exhaust the added Cam size in Lift and Dur on the Exhaust side help clear the Exhaust .

My Friend is Building a 327 right now I sent him an L-82 Camshaft I had but it was made with a 109 L/C grind I think it's going to work well .

great stuff...yes I have a friend with a 66 Canso Sport deluxe and he is running the air gap RPM under his stock hood. The quench will be on the money at .040".
The guys at Comp and Lunati said I should be able to get away with the XE 268 or VooDoo comparable but could run into some detonation issues. This why I steered clear. I asked two guys at Comp who had all my info, "If this was your car, what cam would you run?" and they both said 280H.

In terms of the comparisons I made between the 268 and 280, I realize there is a difference on the intake side with none on the exhaust. And those 6 degrees at .050" will hurt my torque. Just don't think it's as big as some may think. So how will going to a bigger high rise manifold help my streetability...if that is a word.... haha

No plans on porting as this car will never be on the drag strip. Just a street car to make a bit of noise with. Had I wanted HUGE power I would have went 383 or 406. I chose the small journal 327 instead.

that l79 cam @ 050 is 229/236 468/462 ic 108 lsa 112 comp cam #12-671-4..N+l79H

Yes thats the Comp Cams Brand Nostalgia Plus Hydraulic L-79 . Not the Factory #151 L-79 Camshaft .

I am told that the original 151 cam when rated as cams are today is still 305 duration. Not true?

It's 290 adv dur .

Originally Posted by H.O.Rider

I am told that the original 151 cam when rated as cams are today is still 305 duration. Not true?

have a old gm cam i can run threw a cam doctor.. Howards Cams shows a 223/223 447/447 lc 112 #98214 nice idle near duplicate of chev #38633151 Elin Cams #E903. 223/223 447/447 lc 114 copy of 151

Originally Posted by tango

As for the Double Hump Fuelly Heads not being up to the task . Your talking an under 400 H.P Engine that He won't be running much over 5500 and the set he has are 2.02"in and 1.60" ex Heads . Can't see spending over a grand on a set of aluminum Heads for this build only to top it off with a Mild Performance intake . Yes if you have not Ported Heads don't try and do it with out someone there who has . It's an art form that take many years to Learn . Remember this them old Hump Head where used on Dragsters in the old days after being full Ported .

As for that 280H Turning off at 5500 I have had it in 350's that E.T-ed best when shifted at 6200 . No Dyno just Track Time Slips it will not turn off at 5500 if the rest of the build is up for the Task .

And that L-79 #151 Camshaft I have ran in all Kinds of SB's . G.M Measured it in a Different way on the adv dur .

Part # Lifter type--duration at .050 In/ex--Lift in/ex--centerline--description

3863151 Hyd. - 221/221-.447/.447-114 - 327-350HP, L79

Look at that 114 C/L Helps Top end and Idle but hurts Torque . The Later 350-350 H.P Camshaft is Much better .

Part # Lifter type--duration at .050 In/ex--Lift in/ex--centerline--description

3896962 Hyd. - 222/222 - .450/.460-114 - 350-350 , L-82


As for the 280H vs the XE268H You answered you own Question by shown the .050" 224 vs the 230 dur yes that will make the Difference as it shows in Low end Torque . Also on a street car with Full Exhaust the added Cam size in Lift and Dur on the Exhaust side help clear the Exhaust .

My Friend is Building a 327 right now I sent him an L-82 Camshaft I had but it was made with a 109 L/C grind I think it's going to work well .

What are the intake runner CC's on those heads??.My point is don't you need to have those numbers to come up with these dyno sym numbers??.