iokepakai

Suggestions to which roller cam would work best.Motor is a 76 L48 with Edelbrock 70cc performer heads.Air Gap manifold,SS roller rockers,600cfm Summit carb,Stock bottom end with good compression readings in the 155-160 psi.Currently running a Crower 00320 cam.

Current Cam:

Part Number/Work Order Number 00320
Engine Application 262-400 CHEVY
Grind Number 264SF

ADVERTISED CAMSHAFT SPECIFICATIONS:
INTAKE: Duration: 264º Lift: .458 Clearance Hot: .022
EXHAUST: Duration: 270º Lift: .468 Clearance Hot: .024

The specifications listed above are based on a rocker arm ratio of 1.50 IN
1.50 EX

RECOMMENDED VALVE SPRING INFORMATION:
Part # Single Dual X Triple
Approximate spring pressure: valve closed: 105/115 LBS.
valve open: 320/330 LBS.

7.0 BTDC 2.0 ATDC

ABDC 43.0 54.0 BBDC


camcard
The information below is for degreeing cam only. Correct only at .050" tappet lift.
INTAKE Opens: 7.0 BTDC
Closes: 43.0 ABDC
EXHAUST Opens: 54.0 BBDC
Closes: 2.0 ATDC

LOBE SEPERATION 112º

Duration at .050" Intake: 230
Exhaust: 236
LOBE LIFT Intake: .305
Exhaust: .312

If using "Lobe Center" method of degreeing, cam should be installed on an intake centerline of: 108º

NOTES:





Crane Cam 119821:

Excellent low end and mid range torque and HP, good
idle, daily usage, off road, performance and fuel efficiency,
2600-3400 cruise RPM, good w/small plate nitrous
system, 8.75 to 10.5 compression ratio advised. Good w/
centrifugal or small Roots supercharger, 8 lbs. maximum
boost w/8.5 maximum compression ratio advised.
HR-276-2S-12 IG 1600-
5800
119821*a 11532-16b 214 276 112 0 34 .000 .488
222 284 48 (6) .000 .509

Crane Cam 119831:

Good mid range torque and HP, fair idle, moderate performance
usage, mild bracket racing, auto trans
w/2500+ converter, good w/plate or manifold nitrous
system, 3000-3800 cruise RPM, 9.5 to 10.75 compression
ratio advised. Good w/centrifugal or Roots supercharger,
10 lbs. max. boost w/8.0 max. compression ratio advised.
HR-284-2S-12 IG 2000-
6200
119831*a 11532-16b 222 284 112 4 38 .000 .509
230 292 52 (2) .000 .528

Lunati Voodoo,I like this the best,is it to much for my L48??
Also not sure if it is billet with Iron dist gear??
Hydraulic roller, good idle. Excellent choice for stock to mildly modified engines, works well with OEM style injection systems, great inboard/outboard marine camshaft for economy and sking. Good mileage and torque increase.
Lunati 20120710 or 60110

Advertised Duration (Int/Exh): 262/270
Duration @ .050 (Int/Exh): 211/219
Gross Valve Lift (Int/Exh): .507/.515
LSA/ICL: 112/106
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1600-5600
Includes: Cam Only

Specs on the Edelbrock Heads,springs:
#5767 (F) Edelbrock Heads Non-Rotator 120 lbs. 1.800" 320 lbs. @ .580" 1.460" 1.060" 1.130" #9736 #9611 All Performer, RPM,
& Torker Cams

Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
#60759
Valve Lift .100" .200" .300" .400" .500" .600" .700"
Intake 66 127 185 230 238 239 -
Exhaust 52 97 127 146 156 162

Wish the PO went with 64cc heads instead of the 70cc on there now.
Would like to get a boost in TQ & HP.Motor running great so no reason to rebuild or change engine at this point in time.

Thanks much....Aloha's

oldalaskaman

http://forums.corvetteforum.com/c3-p...hlight=cam+kit

Matt Gruber

air gap with cut down divider will cut idle-3000 power and torque at part throttle with the 320 cam.
details in profile sig
post Q's here

iokepakai

Read your carb tuning info,and was very helpful in getting the carb dialed in.Getting 20mph with the current setup and 6 spd OD trans.Seems all the Air Gap manifolds have the cut down divider.I was having fuel percolation issue's.I wanted a manifold that would run cooler,with no heat crossover,& with the rear coolant ports.No easy way to seal up that center divider.Saw how Beejay did his manifold and the results were promising.May try to do something similar when the manifold comes off for the cam upgrade. Thanks

63mako

I think you had the 6 speed if I remember right. I would go a little bigger, you have the gearing for it. This is a billet core, not sure if pressed on dist gear but great specs and correct operating range for your setup. Bonus is it will save you a few hundred bucks and a free $50 summit bucks.
http://www.summitracing.com/parts/hr...make/chevrolet

This one gets you a little more bottom end if your worried.
http://www.summitracing.com/parts/hr...make/chevrolet

Lt1er

If I'm reading your currant cam right you have a 230/236 solid cam?

I have the Crane power -max solid cam. GKULL built my motor about 14 years ago and it happily revs to 7000 if i want to. I use 6500 rpm max. 140# seat and over .500 lift with 1.6 roller tiped rockers. It just smokes compared to my original LT1 solid cam motor.

But anyway the gain of a roller is only a little steeper lobe ramp and holding the valves open a little longer when compared to a solid lifter.

Very litte gain for the dollars spent. A big port dual plane or small Weiand single plane, long tube headers with free flowing 3 inch exhaust would have greater power gains than a cam

63mako

I respectfully disagree. The RPM Air gap port size is likely perfect for his heads and will support 500 HP. A 3" exhaust on an L48 will do nothing for power below 6000 rpm and will likely reduce throttle response and bottom end torque vs a 2 1/2" free flowing exhaust with headers. That L48 bottom end will not handle 7000 or 6500 RPM. The difference in the solid flat tappet cam and roller is more than you think. Subtract out the lash setting in most instances to get true lift and duration numbers. His better heads will respond big time when you increase lift .060-..080 and also increase dwell at max lift substantially. Comparing duration numbers @ .200 and .400 lift is a much better indicator of cylinder filling potential of 2 cams with similar duration @ .050 numbers unfortunatly most manufacturers don't post them.

Lt1er

I understand the area under curve. More modern extreme type solid lobes are probably not that far off of a street h-roller lobe. If I was comparing the h-flat lifter to a roller I would say go ahead. Just a change to higher ratio rocker like 1.6 1.65, 1.7 with new good springslike some kind of beehive might get that existing cam breathing

230/236 might be on th upper duration of the posters compression and the cast crank is a limitation

garygnu

I feel you mite benefit from a little bigger carb like a quick fuel 650 dp.you can try different carb spacers if you have the hood clearance.I like the 3/8 thick open spacers on a dual plan intake.maybe check out comp cams.they have cam quest 6 which allows you to try different cams in a computer program ,and see the different power results.

Matt Gruber

Due to the 6 speed, i'd consider keeping the cam, and going for a stroker crank kit.
Ultra budget would be a 377 if it doesn't need boring, or 383 as most guys do it. This will really wake it up as CR will come up to 10-11:1, and the 6 speed will love the extra torque cruising in 6th. Your current cam is an excellent cam! I would not take it out!
On that summit carb, the rear booster can be removed, and the venturi enlarged 1/8" then it becomes a 675 cfm carb for ultra budget. Otherwise a $299 750 QFT Slayer would work great.
But first, before doing anything, i'd put on a temporary vacuum gauge and check WOT 5000 to redline in 2nd gear. If it is over 1.5-2" it is losing power; VS opening too slow or carb too small.
One last free, but time consuming mod, advance the cam 4-6 degrees, this would really help the low end wih the low CR.

buckhorn 76

a roller i have been considering is the howards cl110235-12 1000-5000rpm. int dur @.050 213 exh 217 int .485 exh .495 lobe sep 112. i will be using 64cc e-street heads and performer with q-jet on a goodwrench 350. pretty much same base motor as the l48.

iokepakai

Great suggestions! Looks like that Voodoo roller cam is not billet and Lunati said to use a melonized dist gear.Here's their response:
Wm,



This is on an Austemper Steel Core. It would need a Melonized distributor gear. If you have any other questions please feel free to let me know.



Shane



Lunati offical logo-med

11126 Willow Ridge Drive

Olive Branch, MS 38654

Like that 111145-10 Howards Cam.Waiting to hear back from them if it's billet and with a pressed on iron dist gear. To many stories of dist gears gone bad on roller cams.Best way to avoid that is with an iron gear on the cam.Looks like the short block was rebuilt,good compression and no oil consumption.Got the itch for a solid cam last year but I'm over it and want to go roller.Looking at these heads,
http://www.ebay.com/itm/SBC-CHEVY-21...item4d00a75ced
To go with the new cam,.Will the 58cc heads perform better that the Edelbrock 70cc heads I have now? That Summit 600cfm carb has been flawless since install.Had a bad time with the Holley Street Avenger that was on there before.Would not run right and sucked fuel beeg time. Thanks for all the help......

Matt Gruber

This is what happens with mismatched parts. The car is a dog under 3,000.
1. 155-160 is LOW. should be 180-200. Cam degreed in? or not? Could be off a lot!
2. cut down divider works on 383+ i hear, but not on 355's.
3. Open center base gasket wrong choice. need 4 holer.
4. VS carb likely opens too slow. A double pump throws u back in the seat! Has the VS at least been tuned?
That crower cam is tamer than an XE268! 230/236 is really ~224/230 after the lash ramp. it is on a 112 LSA, tamer than the 110 on a xe268.
the crower cam now in the car would pull strong from 1500 if it was installed right.
Owner unsure of head cc, says 70cc, now 64cc. which is it? does it have flat tops? or dish? zero deck? or .025"?

63mako

You will love the 111145-10 cam with your combo.
Stay far, far away from the Procomp heads. Your Edelbrock heads are much better. A full point of compression gives you 2-3% increase. If you want to swap heads go AFR 64CC 180 eliminators. Those will give you an extra 50+ HP on top of what the cam gives you and will make full use of the lift of the cam. They would compliment each other well and the sum of the parts will exceed what either will get you by themselves. You can also buy them setup with the correct springs for the new cam which will save you time, labor and money. You could sell your Edelbrock heads and recover about 1/2 of the purchase price to soften the hit on the wallet.
If your 600 works real good don't touch it. Should run real close to the same with the roller upgrade. It is big enough given your block internals limit safe RPM to about 5500-5800 and your 350 CI.
You can buy a melonized dist gear for GM dist for about $60 or a composite for about $100 if the gear is steel on the cam. Easy swap.

cv67

Lunati also makes the everwear gear which is compatible with all of em.
Took to my billet cam gear with no problems at all.

garygnu

how much will it cost to install a roller cam valve train ?seen 383 stroker rotating assemblies from competition product for $600-900,mite be a better bang for the buck.