[besserspat]

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

[Jay S]

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.

[besserspat]

Originally Posted by Jay S

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.

[Steve C.]

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".

[besserspat]

Originally Posted by Steve C.

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.

[Jay S]

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.

[Steve C.]

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 !

[Jay S]

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.

[blueghoast]

Originally Posted by besserspat

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

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

[promptcritical]

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

[besserspat]

Originally Posted by promptcritical

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

[promptcritical]

Originally Posted by besserspat

#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.

[Jay S]

https://butlerperformance.com/i-2503...tegory:1272239