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#1
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Cam Choice. Any suggestions?
I’m looking to change out my cam in my 72 lemans convertible. The car runs great, run’s in the 13’s already. Below are my current engine and drivetrain specs.
400 +0.030 TRW pistions Stock Rods with arp bolts Stock crank with studs for the mains 72CC E-heads ported and polished. Overkill I know. Edelbrock RPM instake Holley 750DP carb Crane roller rockers 1.65 Crane 272H cam currently in car Heddman Hustler headers with 2.5”, flowmaster mufflers CR is 10.2. Runs fine 93 octane pump gasoline TH400 with shift kit. 3:23 10 bolt safe-t-track rearend Any suggestions for a cam upgrade to provide some additional power? Thanks!
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"Everyone is entitled to be stupid sometimes, but you're abusing that privilege" www.musclecarsgalore.com www.nikivee.com [www.reverbnation.com/nikivee 1967 Pontiac GTO 1967 Pontiac Grand Prix 1972 Pontiac Lemans Sport Convertible 2015 Dodge Challenger ScatPack 392, 6 speed 2017 Ford Explorer AWD |
#2
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I had that cam in my 400ci Turbo400/3.55 geared GTO. It ran a best of 13.6 on some 225/70-14 T/A's. Nice cam.
I swapped to a 220/224 .513/.528 lift hyd roller and have run a 13.5 even with a dry float bowl half way through second gear. The engines flexibility is now amazing. I'm working on upgrading my fuel system and hope to get to the low 13's or....... and still have a good idle with 15" vacuum.
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frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. |
#3
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I was thinking something like the Summit 2802 cam, maybe? Or a RAM IV style cam?
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"Everyone is entitled to be stupid sometimes, but you're abusing that privilege" www.musclecarsgalore.com www.nikivee.com [www.reverbnation.com/nikivee 1967 Pontiac GTO 1967 Pontiac Grand Prix 1972 Pontiac Lemans Sport Convertible 2015 Dodge Challenger ScatPack 392, 6 speed 2017 Ford Explorer AWD |
#4
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If ya got the money, I`d go with a hydraulic roller. You need to utilize those heads and a 2802 won`t. Not that a flat tappet won`t, but a roller would be more powerfull and prolly idle smoother with more vacumn.
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#5
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Quote:
I really like the suggestions to running the hyd roller if you can justify the price. I'm not sure how to take advantgage of the improved head flow unless your willing to run a little more converter. You don't mention what converter, so I assumed stock, which limits the cam choices considerably. Looking at the weight of the car and mild 3.23 gear I suggest being carefull selecting cams above @0.050 .218-.220 MAX on the intake side with a stock converter. If your open to running a 2000-2500 converter then I'd go as far as .221-.225 MAX. Finding a cam netting a valve lift above .500 will help use the headflow too. Take a look at the new Lunati "VooDoo" cams, there are some good looking numbers that might work well in your combo. JD
__________________
Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! |
#6
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So much to be gained with a Hyd roller...I agree with David.
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#7
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Hydraulic rollers are more expensive and less effective than solid rollers. With modern roller technology, no reason NOT to run a solid... Our customers LOVE them, and we've had zero complaints about them. Comp XE designs are excellent for a street application.
If you want to stay with a flat tappet, we've been selling a large number of the Comp flat "solids" with XE lobes. Not in catelogs, but great cams for street engines. About 1/2 the money of a solid roller. Jim |
#8
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What kind of specs would you suggest on a solid roller for Nick?
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frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. |
#9
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Quote:
More effective than a hyd roller? How so? Don't they require periodic adjustment? |
#10
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Agree on the solid roller, hyd rollers are dangerous over 6000 rpm. As for adjustments, pretty much once they've taken a 'set', it's not often you need to adjust them. Maybe check them like every 20k miles or so, that's about it, depending on use.
If your stuck on flat/hyd profiles, look at the 288H Crane. Can't go too much bigger because of weight and rear gear....
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#11
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6000rpm? Stock rods? How'd we get to 6000rpm. The cam he has now runs out of steam at 4800.
__________________
frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. |
#12
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"400 +0.030 TRW pistions Stock Rods with arp bolts Stock crank with studs for the mains" Can "safely" turn up to 6300 rpm's as long as it's balanced. Don't fall for all the horror stories about the factory rods not being strong. In a 400 engine with a super good rod/stroke ratio it's a completely different ball game. JD
__________________
Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! |
#13
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I've run 400s with that bottom end into the 7k range without issues, and I'd get 100k+ miles out of them. I wasn't suggesting that it would be turning over 6k, just stated hyd roller lifters aren't durable over that.
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#14
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Lots of good suggestions. I was thinking of a hydraulic roller also, something like a CC XR276HR. But because of cost would like to go with a hydraulic cam such as the CC Magnum 280.
FWIW the car pulls way past 4800rpm with my current cam. I shift at 5500rpm and have seen 6k a few times with no issues. My best ET on street tires has been 13.6@102 and with DR 13.3@104. I do have access to a higher stall converter in the 2500rpm range and was thinking of swapping that in place of the stock converter also.
__________________
"Everyone is entitled to be stupid sometimes, but you're abusing that privilege" www.musclecarsgalore.com www.nikivee.com [www.reverbnation.com/nikivee 1967 Pontiac GTO 1967 Pontiac Grand Prix 1972 Pontiac Lemans Sport Convertible 2015 Dodge Challenger ScatPack 392, 6 speed 2017 Ford Explorer AWD |
#15
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What are the spring pressures for the solid roller street cams?
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#16
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D.S.R.E. Your NW Pontiac Street/Strip Engine Builder, Specializing in Cylinder Head,Intake Manifold,and Exhaust Manifold Porting services and Building the Most Efficient stock rebuilds to Hi HP Pump Gas and Race Combinations for Pontiac,Buicks,Olds,FE Fords,385 Series and HP Gen 3 and 4 LS engines! 2006 silvy Z71 4X4,383 LS 600+hp NA Shared Toy-66 Lemans 470cid by me 537hp 580tq-manifolds, 570hp 590tq-2"headers,custom cam,rpm intake, mild e-heads, Looks stock ;-} |
#17
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Do you have 1.5 or 1.65 rocker arms? I know a proven combo, that will give the performance of the 276HR, for your 400 in a hydraulic. It's the 1.65's that makes it come to life. If you already have the 1.5's you need a different cam. JD
__________________
Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! |
#18
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I've run a 400/RAIV cam combo in a 3858# car with a 3.55 gear and 2500 rpm stall converter and got to 12.70 in the 1/4. Needed more gear/converter as I was going across the line at 4900 rpm. Would shift to 2nd gear at 6000 rpm and 3rd at 5700. Stock rods/ARP bolts, Performer intake and Holley 750, stock pump.
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#19
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Quote:
I have 1.65 Crane gold roller rockers in the engine, so I'm good to go there.
__________________
"Everyone is entitled to be stupid sometimes, but you're abusing that privilege" www.musclecarsgalore.com www.nikivee.com [www.reverbnation.com/nikivee 1967 Pontiac GTO 1967 Pontiac Grand Prix 1972 Pontiac Lemans Sport Convertible 2015 Dodge Challenger ScatPack 392, 6 speed 2017 Ford Explorer AWD |
#20
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Quote:
__________________
Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! |
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