[71 NOVA]

I have a 427 bored 60 over
11:5 compression
781 heads with bigger valves
rpm air gap with 1 " spacer
3200 lb car auto trans
4.56 gears 29" tall tires

want a solid cam (non roller- low buck build up) what duration should I look for?(advertised or at .050 )

 

[71 NOVA]

was thinking about this one- comp cams
Operating Range: 4200-7200 RPM
Duration Advertised: 310° Intake / 314° Exhaust
Duration @ .050'' Lift: 270° Intake / 276° Exhaust
Valve Lift w/1.7 Rockers: .638'' Intake / .631'' Exhaust
Valve Setting: .028'' Intake / .030'' Exhaust
Lobe Separation Angle: 108°

or this one from comp

Operating Range: 3000-7000 RPM
Duration Advertised: 306° Intake / 306° Exhaust
Duration @ .050'' Lift: 260° Intake / 260° Exhaust
Valve Lift w/1.7 Rockers: .629'' Intake / .629'' Exhaust
Valve Setting: .022'' Intake / .022'' Exhaust
Lobe Separation Angle: 110°

here are 2 more from crane

Grind Number: F-256/3634-2S-8
Operating Range: 4200-7000 RPM
Duration Advertised: 292° Intake / 300° Exhaust
Duration @ .050'' Lift: 256° Intake / 264° Exhaust
Valve Lift w/1.7 Rockers: .618'' Intake / .638'' Exhaust
Lobe Separation Angle: 108°
Max Lift Angle: 105° ATDC Intake / 111° BTDC Exhaust
Open/Close @.050'' Cam Lift: Intake - 23° BTDC (opens) / 53° ABDC (closes)
Exhaust - 63° BBDC (opens) / 21° ATDC (closes)

Grind Number: F-314-2 (replaces CC-314-2)
Operating Range: 3800-7000 RPM
Duration Advertised: 314° Intake / 324° Exhaust
Duration @ .050'' Lift: 248° Intake / 258° Exhaust
Valve Lift w/1.7 Rockers: .567'' Intake / .590'' Exhaust
Lobe Separation Angle: 110°
Max Lift Angle: 105° ATDC Intake / 115° BTDC Exhaust
Open/Close @.050'' Cam Lift: Intake - 19° BTDC (opens) / 49° ABDC (closes)
Exhaust - 64° BBDC (opens) / 14° ATDC (closes)

 

[joespanova]

Without knowing what class of lobes these cams are put together from, it appears your 2nd and 3rd choice are good candidates..........

 

[bracketchev1221]

My 427 was about the same in compression, I had the 2.19/1.88 rect port Merlin heads with a Holley strip dominator and an 850. I used the Crane cam that was the next one up from your second choice. I don't remember the part # off hand but I do know it was .628/.648 and 260/268 a .050. I think the range was to 72-7300. It ran well and was easy on parts.

 

[Yellow68SS]

Are you going to try and run on Pump Gas? That will take a pretty big cam with Iron Heads, and you will need to get rid of the RPM intake.

Looking at the cams you listed i would say.....

Pump gas
Grind Number: F-314-2 (replaces CC-314-2)
Operating Range: 3800-7000 RPM
Duration Advertised: 314° Intake / 324° Exhaust
Duration @ .050'' Lift: 248° Intake / 258° Exhaust
Valve Lift w/1.7 Rockers: .567'' Intake / .590'' Exhaust
Lobe Separation Angle: 110°
Max Lift Angle: 105° ATDC Intake / 115° BTDC Exhaust
Open/Close @.050'' Cam Lift: Intake - 19° BTDC (opens) / 49° ABDC (closes)
Exhaust - 64° BBDC (opens) / 14° ATDC (closes)

These are pretty mild lobes that will keep the RPM range down a bit but bleed off more Cylinder Pressure.

Good Gas

Grind Number: F-256/3634-2S-8
Operating Range: 4200-7000 RPM
Duration Advertised: 292° Intake / 300° Exhaust
Duration @ .050'' Lift: 256° Intake / 264° Exhaust
Valve Lift w/1.7 Rockers: .618'' Intake / .638'' Exhaust
Lobe Separation Angle: 108°
Max Lift Angle: 105° ATDC Intake / 111° BTDC Exhaust
Open/Close @.050'' Cam Lift: Intake - 23° BTDC (opens) / 53° ABDC (closes)
Exhaust - 63° BBDC (opens) / 21° ATDC (closes)

Pretty much the same power range but will bump up your Dynamic

 

[greg_moreira]

Look around....you will find some very satisfied users of the lunati 402A7 solid. Its numbers are 288/296 advertised, 255/263 @.050, .612/.630 on a 110lsa. This cam looks at least half right for your engine. With the gearing and and smaller displacement and light weight of the vehicle...it fits. However, I hope the head work is fiarly descent and I have mixed thoughts about the intake. On one hand, I think it could keep up....but on the other, your light enough, your geared enough, and it will rev enough that it should make good use of a single plane with the right converter. As far as the compession ratio....I wont make any promises on pump fuel performance.

 

[Mike Feudo]

Used the F-256 in my street Corvette. 454 true 11.5 to one (milled 12.5 to 1 pistons) Alum factory closed chamber heads, 4spd, 4.11s. It ran great (much better than any factory cam) but with oval ports I don't think you would like it. We ran the Comp 310 -108 in an early Super Comp car again much more motor and a 6000 convertor. Probabily the best cam we tried with that combo but not anything close to a setup that would work in a 3200 lb car. Just helped a guy with a Camaro M-22, 3.73s, and a gear venders, 10to1 427 closed alum heads single 780. He used a Lunati 40207 great street cam I wish they had been around when I was playing with BBs.

 

[Harold Sutton]

Everybody keeps knocking the factory L-88 and ZL-1 cams but i had one in a square port headed standard bore 454 with closed chambered heads, 11.25 compression, ZL-1 cam, and an 850 holley four barrel on a Edelbrock C-427 manifold, 12 bolt chevy rear w/4.10 gears that ran pretty good. I never got it leaving very well due to lack of knowledge but it sure motored once under way. This motor had a single angle valve job and ran low elevens at over 125 MPH. Best was 11.15 @ 126.76 in decent air. I think looking back if the gearing had been a little steeper it would have easily gone mid tens. Crossed at 6200-6300 RPM. My son had the same cam in a 13-1 comp. 481" that went 10.49 @ 128 MPH. I think the two Crane cams you have there will both work good.

 

[UDHarold]

Depending on your converter stall, there are at least 3, maybe 4 choices from Lunati.402A5LUN 285/295 252/261 .595"/.595" 110 about 3500 SS
Lunati 402A6LUN 288/296 255/263 .612"/.630" 107 4000-4500 SS
Lunati 402A7LUN 288/296 255/263 .612"/.630" 110 3500-3800 SS
Lunati 402A8LUN 292/301 259/267 .625"/.625" 110 4500 SS min.
The bottom 3 all have gone 100,000 miles or so in BBCs, on the street, of course.
They will all need a Carter 172-gph mech pump and 1/2" fuel line, tank to carb.
Use a single-plane manifold, 2" headers at least. And mech brakes.....

UDHarold

 

[71 NOVA]

Thanks guys!!

This more than helps, what intake wouil be a better choice, vic jr?

 

[CANTED]

71, I have the f-314-2 in my engine. Very happy with it.

 

[Yellow68SS]

Thanks guys!!

This more than helps, what intake wouil be a better choice, vic jr?

I run a victor jr, but only because the dart and Brodix intakes will not work with my Nitrous Plate. They are better designed IMO and the casting of my Vic Jr is a bit rough. I don't think im losing too much on motor to the dart and brodix and the price is quite a bit better for the jr to.

You should be fine with a Vic Jr.