Would like some thoughts on roller cam lift spec comparison. Two cams identical specs with one at .660"lift and the next at .690"lift. 280*@.050. Intake port flow difference,advertised, is 4-5 cfm. My thoughts are about 8-10hp. Wallace racing calculator shows to expect about 3 hundreth's of a second in a 5sec. 1/8 mile car. Any thoughts ? Also, has anybody had their Super Victor intake manifold plenum ported by Wilsons and what were the results. Again thanks all for your input, Bill

Wilson did a full competition port job on my Super Victor. It came out looking very cool and the engine picked up about 25 hp.

No idea on your cam question. Could range from zero to a little bit.

Not identical, but we get the idea? You should contact the manufacturers and ask about the pros & Cons of the lobe profile, and what rocker ratio and valve springs they require.

Am trying to decide how much, if any, that I am giving up if my camshaft has a.440" lobe vs the .460" lobe it was supposed to have.Have already purchased 1.5ratio rockers and B3 geometry correction kit, so 1.6 rockers are out.Actual valve lift is .660" vs .690". This equates to about 5-7cfm intake flow. Cam is reported to perform very well in another vehicle with similar flowing heads and flat top pistons. My engine has 13.5 comp. I plan to spray up to 150hp, if needed,so maybe I'm too concerned about a minimum power loss?? Any thoughts from any of you who've been down this road before? Thanks,Bill.

There’s really only one way to know how much difference in power there would be.

The way I would look at it is........ how much extra power would the higher lift cam have to make....... for the swap to be worth the time and $$$ you’ll invest in it?
And....... does that seem like a reasonable outcome for an increase in lobe lift of .020?

If the cams were close to identical, say same lift at 0.200", I don't think the extra lift is going to make a huge difference.
I would run the 1.5:1 rockers on the exhaust, and if you want more lift, put a 1.6:1 rocker on the intakes.

run the 1.5:1 rockers on the exhaust, and if you want more lift, put a 1.6:1 rocker on the intakes

This^^^, makes .660" = .704"

Just a reminder to check coil bind on the springs as You bump lift up with larger ratio rockers. There are always surprises

Thanks guys for all the feedback on this. Should have had a cam card made or contacted Cam Motion when I first purchased this cam several years back. Was supposed to be .690lift but got a surprise when I started to degree it in.All my rocker arm geometry/valve spring dia.& height gymnastics and related would have been simpler, as I was desperately trying to find that extra .030". Y'all said Victors are tough,a lot of work,AND YOUR RIGHT!! This is for a completely untested, actually not yet completed car. The targets are tube chassis 2500-2600lb. weight and 775-800hp. I intend to sort this combo out to run as 5.50 index car. Spraying up to 150 is also in the plan, only if needed. I am sure I will be back again to tap your greatly appreciated knowledge and experience. Thanks again, Bill

What rocker arms on the Victors? I have the T&D 1.6:1 ratio (Intake and Exhaust), but see they now have the paired shaft rocker setup.
Getting 2.00" install height on Victors is not easy, and with the Comp HXL lobes with 0.454" lobe lift, theoretical valve lift (with 1.6:1 rocker) is 0.726"

To answer rocker arm question- Hughes 1.5 rockers for Victors.Have done all the calculations and modifications,along with help from Jeremiah and Mike at B3 Racing,to get
1.625" dual w/dampner valve springs, at VERY close to 2.00'" installed height. This is without any rocker arm clearancing or spring seat cutting. It is all based on a .690" valve lift, with a little wiggle room. I can post or pm these part #s and specs if anyone is interested. Glad to share any and all info that I have on this subject. Thanks ,Bill

What spring pressures? Keep an eye on the rocker stands, that is where I had issues.

spring pressures- 290/300lbs on seat, 660/670lbs open. 9945RAD Isky springs. Redrilled #1,3,5 rocker stud holes to same depth as #2,4. retapped to same depth also,to accept 3/8 x 16x .938" helicoils, as suggested by Brad H. Then new ARP longer rocker studs to work with B3 correction kit. Springs are 1.625"outers. Bill

I don't understand the need for either a 1.62" OD spring or a 2" installed height for a .700" cam... Am I missing something?

You're not really missing anything, Brad. This is a bucketlist project. Am 66yrs old. Am overbuilding, somewhat, looking for longevity thru durability.Valvetrain geometry correction kit coincidently, made the bigger 1.625" spring much easier to fit. I am building with the hopes that it stays together long enough for me to get it sorted out. 5.50's and the required 800-900hp needed to get there may sound much simpler on paper than it may really be. Megablock ,tool steel upper rings, aluminum rods,and ARP studs may be overkill, but chances are that the money Gods won't let me build another one.2.00" installed height made it easier to find a spring of that diameter at the pressures recommended for that lift. Not many choices with that height. I am actually at 1.95"- 1.97" installed height. As you know, valve stem length is the issue. Again, thanks for the guidance with the rocker stud issue. Turned out well and was not too difficult. Thanks, Bill

I used the PAC-1326 1.55" dia valve springs (275lbs@2.00", 739lbs@0.700", rate 663). How is the rocker arm to retainer clearance with the larger diameter springs?

Rocker arm to retainer clearance is excellent with combo of Isky 975 lightweight steel retainers, VL750 locks, B3 racing geometry kit,and Hughes 1.5 rockers

Every 440 motor that I raced went faster with more air and fuel increase, bigger carb, bigger cam shaft and or bigger rocker ratio on the same cam went faster at the track, bigger heads that flowed more
My first pump gas stroker motor had a decent solid roller cam in it, 260@.050 with .420 lobe lift on the intake lobes and 266 @.050 with .409 lobe lift ground on 108 LSA installed from 1.5 to 2.0 degrees advanced. I swap heads, rocker arms , intakes and carbs, all with the same camshaft and two different sets of lifters. First set of lifter had .750 diameter wheels(Mopar brand that broke two roller into two parts wheels before I replaced all of them ) and the second better set had .820 wheels, which made more duration and lift making the cam a little bigger
That motor was a great experience and excellent learning for me, it started off running 10.69 at 124.MPH in my 3450 Lb. pump gas Duster with a set of ported big valve 906 iron heads with 9.25 to 1 compression ratio, I swapped the heads to a set of CNC ported Eddy RPM heads and that picked up the car to 10.49 at 127..MPH.
I swapped the crank out from 4,250 stroke to 4.300 stroke crank to increase the compression from 9.25 to1 with the pistons down .025 up to zero deck height which increase the compression ratio to 10.29 to 1, that help it go quicker and faster also That was with a low deck six pack set up with original 440 automatic carbs.
The final combination was with a set of Indy STR Max wedge intake ports and a Indy 400-3 intake with a 1050 CFM Holley Dominator carb. That help the car run 9.993 at 134.6 MPH through the muffs on Oregon pump swill with me in the car
I had dyno tested a set of Indy CNC ported 440-1 heads also and they where worth right at 50 HP increase on the Duster pump gas motor over the SR heads on that motor on pump gas. I ended up using the 440-1 heads on a 440 stroker 526 C.I. race motor. that I ended up selling before racing it

Every modification to produce a few extra horsepower, at this level,is getting very costly. I am just gonna bite the bullet and put this thing together and get it sorted out before I run out of money.It should,hopefully, run close to the number and I will tweak it with a small shot of nitrous after it gets sorted out. Don't want to complicate the process early on with the nitrous. Gotta make this thing hook first! Thanks for all the input ,Bill

My experience is........ there’s usually a pretty big spread in $$$ and effort to get from 800 to 900.

That being said, you made your decisions, bought your parts, and are putting it all together.
It’ll make what it makes........ regardless of what anyone says about it.