What you guys think of the 507A1 Cam from Lunati
 

I wanted an Old Faithful cam hybridized with solid rollers. but while I exercise my patience , I was contemplating running a solid roller or even a Solid of Hyd Flat.

Lunati 507A1 : Solid Roller Cam. Good cam for real street or mild bracket racing applications. Needs 2500-3000 RPM stall converter, head- ers, 9:1+ compression ratio and 3.55+ gearing. Fair idle. ;Advertised Duration (Int/Exh): 278/285 ;Duration @ .050 (Int/Exh): 242/249 ;Gross Valve Lift (Int/Exh): .556/.556 ;LSA/ICL: 112/106 ;Valve Lash (Int/Exh): .020/.022 ;RPM Range: 2500-6000

I like the 112 LSA since I spray a 200 shot.

My built is a 461 using SD CNC heads ( 260 cfm), HO Intake , Q-jet, 1 3/4 dougs , full 3" exhaust, built Th400 Continental Jim Hand special converter and 3.08 gears, may go up to 3.36 or 3.42 if needed.

Peter

It would work well with the 3.08s, it is quite a bit smaller than a Old Faithful cam, more like a stump puller. It is an old Ultradyne profile used for street and marine applications, Bullet racing cams has the same lobes, L34 and L35.

Its interesting that you say thatbecause recently I have been losing faith in finding an OF cam and if I could squeeze 500hp and 575+lb-ft out of my 461 like Dave at SD says about his Stump Puller Id be happy with that.

The stump puller has quite a bit more lift in it though, maybe the 507A1 with 1.65 rockers ?

I mean Im running a 200 shot on top of that...which would bring me already on the ragged edge of the stock block casting.

I think Jay meant R34 & R35 lobes here:

https://www.bulletcams.com/Masters/u...nemasters.html

Many years ago UltraDyne used to list in the Pontiac section of their catalog a similar solid roller with 278 degrees intake duration, same lobe lift and ground with a 112 LSA.

They stated "Very streetable, 2800 converter. Broad torque curve".

Thanks Steve! I figured the lobes when jay said it I went to bullet and found the lobes, they respectively have 154 and 164 duration @200, seems a fairly smooth profile for street, Id be curious to see what it could do with 1.65 rockers.

I think i'll need new springs anyway , even with a stump puller , my SD Performance 260 cfm , CNC #46 heads currently have comp 995 springs they have 7* locks in em.

Dave told me to switch to 10* if I wanted to use those springs and run his Stump Puller cam.

Whats your take on that 507A2 cam? I mean it will probably take as much time to get one done as a Stump Puller anyway ...Man Im tired of that damn "covid19" parts shortage.

Thanks Steve, that correction is correct.

There would be a decent chance Bullet would have the cam core for a R34 and R35. Might even have it for a 4/7 swap, which would not be a bad idea with a big NOS shot. Lunati might be a very very long wait.

You could go clear up to 1.8 rockers on those profiles if you wanted too, they are not aggressive.

I agree with Jay, call Tim Goolsby at Bullet Racing Cams and check on a cam core. Tim worked with Harold Brookshire at UltraDyne for 21 years.

Yes, your going to need new valve springs !

I think that Lunati or Bullet R34/35 combo would make a nice SR street cam with Iron heads. IRC..The Lunati grind your looking at is a .0175” lash ramp design, meant to run .025” lash. It has some “whirl” sound to it, and normal SR clatter, there will be no mistaking that it has a SR cam in it, but they work well. I don’t think it would have much issue out running a SP2 with iron heads.

Personally though, for solid rollers on the street with iron heads, my favorite is the modernized Ultradyne Bullets .3832” profiles. The iron heads don’t expand much, and run tighter lash (.004” to .014”)so the lifters don’t hammer on the cam. But still have a decent sized lash window for tuning and street use. They don’t take much spring pressure, and are easy on parts.

Tim at Bullet suggested the .3823” SR grind to me a few years back and we really like them. He calls it a modified HR grind. It works with very well with HR or SR lifters, with SR lifters it is actually quiet enough that it you can barely hear that it has a roller cam, even with a pretty quiet exhaust. IRC they go down to as small as 228* and .050” and into the 260*@.050” in 2* increments on their CNC program. Tim will tell you the specs on the cam after the lash is taken out, so you don’t need to guess, and match it ip to your combo. Can get it in 4/7 swaps too.

That is going to be wicked on the juice and if you could a solid flat tappet
cam with the same specs would save you some money and work real well
also, It would be very streetable and maybe as much close to 10:1 comp.

GT

What heads are you using? I don’t see that. Thanks.

#46 Iron heads, Full CNC porting by Dave at SD Performance, 995 springs installed height 1.7,

IN Flowed 250 and 260 CFM @ .500 and .600 respectively
EX Flowed 190 and 200 CFM @ .500 and .600 respectively

98cc chambers

Thanks, I’m just trying to keep up with you all are dealing with. :cool:

That's the cam I have. It's very similar to one of the SD cams. Can't remember if it's the Old Faithful or the Stump Puller, but I think it was the OF. SD doesn't have the cam specs on their site anymore, at least that I can find.

How you like it? That cam looks like a gopy of the OF I cam . Thats the Butler that Cliff told me to get. I was offered the 230 236 510 420 114 cam but I feel its a little small.

I have contacted Tim at Bullet and with my specs well see what he will come up with

The Butler cam Jay linked above uses Comp XE hyd roller lobes 3194 & 3317

The SD Performance Old Faithfull over the years has had various variants.
From a early cam card the original version:

Comp High Lift Magnum lobes

Lobe 3122B
289
236
160
.3800

Lobe 3120B
306
236
245
.3830

112 LSA



.

As Steve C mentioned it's not exactly a copy of the OF. Different lobes and less lift. You could match the lift with 1.65 rockers though.

As far as how I like it, so far so good, but I don't have much driving time with it yet (winter). But, the idle is good. Smoother than I thought it would be, but enough lumpiness to know it's there (you can hear it in the youtube link in my signature). Good vacuum for brakes. Seems happy with casual driving at lower RPM. Very strong mid range. That's about all I can say so far.

Edit: I will say that if Cliff recommended it, I'd give that an awful lot of weight.

[QUOTE=j

Edit: I will say that if Cliff recommended it, I'd give that an awful lot of weight.[/QUOTE]

You seem to have dynoed your engine, are your heads ported? CFM? We have very similar CR .

My problem is I want to run it Hybrid , and XE lobes are a little steep for a Hybrid set up, as far as I know.

Butler seems to run XE lobes still, even if Cliff was under the impression that Butler decided not to use the XE lobes anymore.

The 230-236 114 Butler roller that was offered to me is also running XE lobes. Its a little baby of a cam especially with 510-520 lift... but If im going through the trouble of running a roller Id like something at least like the Stump Puller or OF I .

Most guys, like Cliff have run the SR lifters on HR cams on Aluminum heads. The Aluminum heads need the less aggressive cams off the base circle (like the Magnum’s) so when the aluminum head expands the lifter does get too high into the profile and still operate quietly. Since this combo has iron heads you can easily run a more aggressive cam profile like an Extreme energy HR. Iron heads will not increase lash as much when heat soaked.

The SR lifter on a HR cam loose some duration against a HR lifter. Keep that mind also. It depends on what lash is run. If you want you can set the intakes with zero lash and light friction turning the pushrods. Then .004” on the exh cold. The most lash you would probably be able to run setting it cold is .006” intake and .008” exh.

Yes, the motor was dyno'd. But, as I'm sure you saw the results were questionable.

My heads are just Edelbrock out-of-the-box D-ports with some clean up of the bowls. No actual porting.

I don't know anything about running hybrid setups but it looks like you already have advice on that.

I just noticed in my post #16 above I got the specs incorrect on the exhaust lobe for the SD Performance Old Faithfull cam. Sorry for any confusion.

Here are the correct numbers:

Lobe 3120B
306
245
161
.3830

The numbers in that post and here are direct from a friends Old Faithful cam card. He purchased it from Dave in 2008


.

John,

I think what is holding back the idle is the X-pipe. I have changed all my cars to H-pipe. each car's idle was held back in terms of deep sound and the lope of the idle. In each case, it changed the sound to the way I want the car to sound like a muscle car.

Here are a before and after video of my 1970 GTO running a 461 with the off the shelf XR 288. It is the same cam you have except the LSA is 110.

Before:
https://www.youtube.com/watch?v=EoYVfvmtuX8
Exhaust is Magna Flow with X-Pipe

After:
https://www.youtube.com/watch?v=GYMaDAeOO3g&t=47s
Exhaust is now Flow Master American Thunder Series with Texas TA mufflers and H-pipe.

Big difference in sound.

I remember that you mentioned that before. There's a big difference in sound for sure on the videos. When I bought my system, Pypes didn't have the H-pipe available. They don't even show it on their website right now, as far as I can find. I'll have to give them a call Monday.

John,

I don't think Pypes ever offered the H-pipe. In fact, I'm having the last conversion done next week.

The last car being converted is one of my '78's with a 461. It has the pypes system on it right now with the x-pipe. My tech guy had a problem finding an h-pipe. It seems the industry is getting away from it. A person use to be able to get just the h-pipe section. In order to get the h-pipe now the entire exhaust system has to be purchased. Thankfully, my tech guy knew someone that had an h-pipe laying around and picked it up at the price that is a fraction of a full exhaust system.

Hey Jim. Pypes definitely make/made H-pipes. Summit has some in stock and Pypes shows a system on their site as well. They just don't show it as an individual part. I'm gonna call tomorrow. Summit also sells a kit to make one. Maybe my guy can make one, I'll have to ask him.

https://www.summitracing.com/parts/p...bird/year/1970

https://www.pypesexhaust.com/product...-409-stainless

John,

Thanks for the information on Pypes. Didn't know they offered it. However, it still shows the only way to get it these days is as a full exhaust system.

If you can get your guy to make one and splice it into the existing system that might be the best way to go and get the sound you want. Also, it can be easier on the wallet.

I always kid around with my mechanic that when I have to pay for a project, I tell him I'm here for his weight reduction program. One would think weight would be taken out of the car to make it faster. Nope, it makes my wallet lighter. LOL. Happy New Year!!

Yeah, I'm enrolled in a similar program.

Happy New Year to you too!

Update: I called Pypes this morning and they have the H-pipe, they just don't list it for seperate sale. However, since I bought the system from them, they sold me the H-pipe. It's a direct replacement for the X-pipe so it should go right in.

John,

Thanks for the new information. Here are two more videos of my '78 with the 406. It runs two separate mufflers even in the video with the x-pipe.

First is the car with an x-pipe.
https://www.youtube.com/watch?v=DfOkesxdb7M

Second is the same car with only the x-pipe changed to an H-pipe. I taped this yesterday. The cam is the BOO HISS XE274H-10 flat tappet from Comp cam. I hear the lope in the second video a lot more than the first.
https://youtu.be/oP91rZkA84Y

I figured it might help to hear the difference on a second generation bird.

Jim

Yeah, big difference in the videos. I'd guess even more in person. Thanks.

No question about it.