I normally post over on the chevelle board but there are alot more guys here that run the 327`s so I thought I would ask you guys. I have a 67 elky with a 275hp 327. I`m just curious what you guys would recomend for a cam upgrade. I`m going to reuse the stock fuelies if they are any good and run flat tops. It has a/c and pb so nothing too wild and has to be a hyd or hyd roller and must have a rump to the idle. Tranny and rearend not decided on yet but I just wanted to hear what you guys have done or would do with a similar motor.

I am building a 400 HP 327 right now that started life as a 275 HP version. Goes something like this:

- Machine all parts to blue print specs
- Balanced rotating assembly
- Forged pistons and ARP rod bolts
- Crane hydraulic roller cam and lifters
- Comp Cams Pro Magnum full roller rockers
- Pocket ported 461 double humps with stainless 2.02/1.6 valves
- Edelbrock intake, carb, fuel pump and fuel lines
- Hedman headers
- HEI ignition

Enjoy! :thumbsup:

Thanks Chris. I already have a idea on what parts I`m going to use. I was just wondering what others would do. I`ve built a 327 that ran low 12`s but if I want to run those times again I`ll probably build a stroker and have a more streetable motor. The last one needed too much gear to drive it much. I`m just looking for cam ideas for a little hotter than stock with a nice idle and still be able to run my a/c, if I keep it on there, and my pb.

- Forged pistons and ARP rod bolts
- Crane hydraulic roller cam and lifters
- Comp Cams Pro Magnum full roller rockers
- Pocket ported 461 double humps with stainless 2.02/1.6 valves
- Edelbrock intake, carb, fuel pump and fuel lines


So what cam, manifold, carb, etc are you actually using? Care to share specs and dyno results?

Your motor will run fine with no more than a good old CC 268HE or 270 Magnum, a Crane/Cam Dynamics 272/272 Energizer or 274H06 or and Isky 270 Mega hy-cam.

It won't be 400hp, but it will still run fine, imho!!

Add a good old Holley 1850, 600 cfm carb. on a 300-36 true high-rise intake and a cheap set of 1.625", 4-tube, long headers and I figure that it will run like a "scalded-dog"!! Mine did..

pdq67

272 Energizer and just the old 300hp/327 AFB cast-iron intake with the old 600 Holley and headers was all.

If you want 400 HP, dump those camel back heads for some pro actions. (The new pro-toplines). If I was to do my engine again, the camel backs would be gone.

Just for a comparison, I ran some numbers thru Desktop Dyno and just by changing heads, it gained 53 HP and 5 lbs TQ.

Take the combo you have with a 600 CFM carb. and use an Engle EP-22 Solid lifter cam will get 360 HP 392 TQ. Change heads and this will give you 424 HP and 403 TQ.

I find it hard to believe the any of these combo's will turn 400 hp. What do you think pdq67? I think you have more knowledge on these motors than most. I am building a 327 myself, specs below. I have not acquired all the parts yet, so any changes that I can make now to hit that mystic 400 hp, I will be happy for the advice.

327 bored 0.030 over
272 engergizer cam
heads undecided - probably Edelbrock Performer RPM
670 Holley Carb - vacuum secondaries
Keith Black flat top pistons

I do figure they will, but at a price of new heads like said!

I'm old-school so just try to use what I have is all and the combination you list is right on the mark to me for a very nice sweet running street 327 motor!

Imho, what you will have is basically a hopped up 300hp/327 if you use double-hump heads and TO ME, mine ran FINE!! AND the E-brock jobbers sweeten the combination too!!

And fwiw, there are guys getting 425 to 440 hp outta the hopped up little Z-28 motors too nowadays pretty darn easy...

pdq67

PS., I do know that I am expecting right at 400 outta my next about 10 to 10.25 CR. junk292/301 motor with NOTHING fancy at all in it except 1.6 ratio rockers and a 280/246 solid lifter cam.. And I'm setting it up so I can shift it at 8,000+ rpm just for the fun of it!!

Bowl-blended and port cleaned up both 305HO, -601 heads on a 292"er or my big valve -291's on a 301"er along with a good old 600 cfm Holley carb on their 300-36 intake and a cheap set of 1.625" dia, 4-tube, long headers. NOTE NOTHING fancy at all here...........

My brother's running a pure stock 327, orig heads .040 over with the comp cams 268 cam and it runs mid 14s in a 67 chevy nova 4spd with 3:73 rear...nice lope to it as well.

I had a 327/275 and installed the GM hyd cam from a 1967 corvette 327/350 horse engine. It perked up nicely but was very stock running/idling. Not a huge gain but nice. I agree better small port aftermarket heads like the Edelbrock E-tech would really help.
David

The 275 HP is actually a real good starting point for a street motor. The only thing holding it back is the very mild cam. When it comes to aftermarket heads you need to remember that this is a 327 not a long stroke torquer of some sort. It will loose much of it's streetabilty with a large set of heads sure you can make some pretty impressive HP numbers but they will be a high RPM and the torque range will be up to the point that you need 4.56 gears to make the thing work. I would just change the cam and keep a Q-jet on it you will like it.

I think what oger is trying to say is - It is very easy to over cam a 327. Make sure your 327 has enough compression or it won't like the cam, and a 327 IS a small motor and doesn't want alot of cam ! (It will run better with a smaller cam.) I didn't believe an older gentleman, when he told me my cam was too large for a 327. He was right... I was wrong.

Thanks for the input guys. I`be built many 327`s and I know how they respond to cams. My last one had domed pistons and a solid cam and ran really good but I`m wanting to do a mild driver motor with a decent idle. The most mild 327 I had ran a Isky 280 mega that ran good considering the heads were old power paks, pg tranny and 3.08 peg leg. I don`t like Q-jets even though they have a good rep for decent performance and decent gas mileage. I`m going to swap over to a holley and I`m keeping the fuelies stock with bowl work if anything. I`ve never built a "stock" motor so I keep getting tempted to run larger cams than most people would.

Another cam you might consider is the little known -476 GM 350HO crate motor cam. The specs are 211/221 @.050 .435/.460 lift 112.5 LSA. This cam should run well with 9.0~9.5:1 compression. BTW, GM says this is a more modern version of the original 327/350HP cam.

I think we have the cam selection down. How about heads. What heads are being run in the 327 to make 400 hp.

Well my old 327 was never dynoed but based on the mph and approx weight we guessed it at 375-380hp. Here is what I had

SJ 327 with stock steel crank and rods with ARP rod bolts
4.040 KB .100" dome pistons-.006 deck height
Schnieder solid cam 284/288 248/254@.050 .530/.530 108 LSA
GM 041 2.02/1.6 ported and polished flowed 224cfm@.500
Edelbrock scorpion intake ported to match heads
750 holley list 8156

This set up ran a best of 12.18@114mph in a 65 chevelle with 4.56 gears,26" slicks and a too small 2800stall.

Cam- GMPP PN#24502476
212 222 435 460 112.5
(GM replacement 350HP/327 cam)
This cam new updated grind has proven it's self quite a runner.

Intake- Holley 300-36, Ebrock Performer RPM, or a Weiand Stealth intake.

Heads-Stock Voretec, Edelbrock E-Tec 170, or Performer RPM

Carb-No more than a 650cfm jobber.

Cam- GMPP PN#24502476
212 222 435 460 112.5
(GM replacement 350HP/327 cam)
This cam new updated grind has proven it's self quite a runner.

Intake- Holley 300-36, Ebrock Performer RPM, or a Weiand Stealth intake.

Heads-Stock Voretec, Edelbrock E-Tec 170, or Performer RPM

Carb-No more than a 650cfm jobber.


Well I think you and "granny" have a good choice in the Gm cam. I always wondered how well that cam really performed but never knew anyone who ran it. I`m going to keep my camel humps and might even keep the q-jet. I don`t know much about them but I know they are famouse for decent mileage and performance. Thanks guys.

Remember, an about 9.75 to 10 to 1 CR., 327 motor will run best with a 268 to 272 cam in it!

NOTHING fancy here, but it will, imho...

pdq67

well normally I would want a bigger cam but lately I`ve been wanting to keep it mild and simple. Gas prices are crazy now, I can only imagine what they`ll be when the car is on the road. I just want something that my wife can drive if she wants, nothing crazy.

Remember, an about 9.75 to 10 to 1 CR., 327 motor will run best with a 268 to 272 cam in it!

NOTHING fancy here, but it will, imho...

pdq67

I had a 1968 275hp/327 in an Impalla.The engine tag said 10.25:1 if I remember correctly.Given GM's tollerences you might actually have just what PDQ said, 9.75-10.0.

That GM Cam (GMPP PN#24502476 212 222 435 460 112.5) is a good one.The only problem I see is that I've never seen any advertised duration figures on it.

Does anyone know the advertised duration spec's are on it?

I just looked it up at Salle Chevrolet. It`s listed as 320/324. I don`t know if it was correct or not but it`s what was listed.

It's correct per the way GM measures them, but I figure that it is more like a;

260/212/272/222 hy-cam tho... Or thereabouts if measured like CC or Crane measures theirs..

pdq67

It's correct per the way GM measures them, but I figure that it is more like a;

260/212/272/222 hy-cam tho... Or thereabouts if measured like CC or Crane measures theirs..

pdq67

So would it still be a good cam or what? I was told I had a Crane 272 in my old 350. Only loped a bit when cold but ran pretty decent all things considered. I know you`ve suggested that cam to others before. I do want something that will have a noticeable idle.

If it's duration is only 260intake and 272exhaust then it looks good to me.
It's not much in a 350 but should be a littel rougher in a 327.

Generally that lop/rough idle is bleeding off cylinder pressure.Higher cylinder pressure is what helps build torque.
Torque is something that you won't want to give up on a street driven 327.
If you do the next thing you'll be posting is how do I get more bottom end torque...

I think mileage dropped one mpg or maybe two. I had a four speed and 3.08 gears, freeway driving I got 18-19 mpg stock, and 17 or 18 mpg with the 350 hp cam.
If I were to build a 327 and needed heads, I'd try the small port E-Tech heads, they did very well in the "Danger Mouse" magazine series. Probably worth 30 hp, maybe more, and the chambers are more efficient than any old style head.
A pocket port of your old heads will add 20 hp, well worth it.

If it's duration is only 260intake and 272exhaust then it looks good to me.
It's not much in a 350 but should be a littel rougher in a 327.

Generally that lop/rough idle is bleeding off cylinder pressure.Higher cylinder pressure is what helps build torque.
Torque is something that you won't want to give up on a street driven 327.
If you do the next thing you'll be posting is how do I get more bottom end torque...


My first and most mild 327 had flat tops, powerpak heads and a Isky 280 mega that loped really good. it had plenty of low end torque, even with the pg tranny and 3.08`s. It was a mixed matched combo that ran decent for what it was but eventually i figured out what I was doing and built a low 12 second motor. that motor also had plenty of torque. I`m not trying to build another 12 second screamer, already did that. Just a nice "stock" driver that has more than stock performance. I just can`t put a stock smooth idle cam ina any motor I own whether it hurts performance or mileage or not. It`s just not going to happen. I won`t be posting "how to get more low end torque" because of all the 327`s I`ve had, none of them were low on torque.
As far as the heads go, I`ll be using the camel humps that are already on the motor.

You want LOPE!!

Go an old Crane 274H06 and be done with it..

pdq67

Well I`ll probably stick with the cam I had in mind before making this post which was a Isky 280 mega. I ran one before and was happy with it. It should still be ok with the power brakes. I`m also picking up a 454 shortblock so I might just go that route but I`m trying to keep the elky a driver and it would`nt be with the 454. Thanks for all the replies guys.