Hello, I am just about to order the Lunati solid roller cam ( 516A5LUN ) which has 738/738 lift and 313/322 duration , Along with the Comp Cams 836-16 Roller lifters, The Cams power range is 5'000 to 8'500 but as its going into a 557ci Im guessing power range will come down to 3'000 - 7'000 hopefully to match the Victor Intake 2965.. Am I right or wrong ?

 

I forgot to mention I was told that with a Solid roller camshaft it doe's not need to be run in like a Hydraulic or solid cam, also do I need special cam bearings with that Lunatic Solid Roller cam.. Thanks.

 

don't know about the rpm range, but you shouldn't need any special cam bearings with it. as long as they didn't change the bearign journal size ont he cam (they do that on some small block cams to get higher lifts as the lobes are bigger than the journals so the cam won't slide in)


but you might need a different distributor gear, so check out what Lunati recommends for dist gear and make sure you have the correct gear. if not, you will be changing it fairly quickly.

rgds
Mike

 

mcdonaldm is correct you will need a new distributor gear. I have ran the roller cam bearings before with good results, but this requires machining the block ,regular cam bearings will work fine. I will guess your power band will be in the 4600 - 7200 range depending on how good your heads are.

Here is a video of my 466 with tfs heads you can barely see the tach , but watch how high it stays after launch .

 

Hello ky mustang, It was a little hard to see your tacho, but looked like it was around the 7'500 rpm range , I was hoping my 557ci cam range would come down to around 3'500, As my car runs a 4 speed Toploader gearbox- 9 Rear' 31 spline axles and 3-5 ratio, I might have another look on the web for a solid roller around the 4'000 rpm range, I spoke to a local head builder, he is going to change my valve springs - to match the roller cam ( as now set-up for 700 lift ) along with a port job on the Edelbrock 61649 heads, Is there any way of working out a cams range when you are adding nearly 100 cubic inches ????? Thanks.

 

You are planning on running this on the street correct ?

 

Yes ky mustang, but very rarely, I plan to take it down to the race-track to do a few laps every now and then, once or twice down the 1/4... take it to the odd car show, apart from that mainly locked away in my garage, So driveability is not a concern that is why I am looking for big horse-power in my 557ci build, I have been looking at some Crane solid roller cams but that Lunati cam still seems to be the one I prefer... for the build.

 

Don't worry about where the power band is , just build it with matched parts (cam , intake , compression , etc) It will still pull on the street at low rpm , more than you can hold to the pavement also. If you are worried about braking parts there will be little difference in reliability in 6500 and 7500. My little 466 peaks around 6700-6900 so you should be just a tad lower imo.

You need to be worried about breaking those little axles first lol .

 

Hello again ky mustang, I think I am going to go with that big Lunati camshaft !!! I was told now that I have alloy heads I can run higher compression in my 557ci- I plan to have 10-5-1 compression, can I go a little higher with compression and say use 98 octane fuel... what compression do you run in your 466ci ? With a solid roller cam I dont have to break it in- Right,Thanks for your input. Jamie, Australia.

 

No break in required on the solid roller. I run 13.5 -1 compression and am using alcohol. I really don't know what to tell you as far as compression limits on pump gas. I have read on the net of guys running that high , but have never tried it my self.

 

Jamie that cam is really going to want more compression than that, it will run but it's really going to want to be in teh 12:1 comp range for best with that cam. But one advantage with that cam, alloy heads you won't have any trouble running 98 octane at probably as high as 11:1 comp.
in a bigger engine like yours the rpm range as I think someone else stated is going to be in teh 4500-7500 range, it's really going to want a pretty big stall for best performance (around 5000 stall although you probably could get by with a 4000)
you didn't mention what the LSA is on that cam that would make a difference too. the other thing I would like to see is a flow chart on your heads after porting, thats one area a lot of people don't realize it makes a difference in cam choice but for optimal you want to get your valve lift around max flow for the heads without getting it up to the point the heads go turbulant and you start losing flow.

btw for reference my cam adv duration (what you have put on here is advertised) is 314/328 lift is obviously higher due to the heads I run at .785/.808 LSA is 112 and I had it ground with 2 degrees of advance in it. I run a stall that is real close to 5000 rpm, I shift at around 7200 rpm and it's still pulling hard at 7800 rpm (rev limiter is set at 8000) I also run 13.5:1 compression on 112 octane race gas. I designed that cam specific for my engine and heads but it's not really all that far off of the cam you looking at.

Sorry I didn't get back to you earlier on this question BTW.

 

Hello Monsterbaby, Maybe I am going over-board with that big Lunati camshaft, I just had the idea if I go to a solid roller cam I might as well go big - Value for dollar thing !!! If I could find a big solid cam ( not a roller ) say with around 660 lift maybe I might be better off as I would save a few $$$ as I would not need the port job and valve springs replaced on my 61649 heads, As I do not want to go to racing fuel, I want to keep it in the 98 octane range so 11-1 or 10-5-1 compression should be O-K in the 557ci. I will search the web once again now but for a solid cam and lifters, Comp cams, Isky, Crower, Crane... Are the Solid cams any good ? As I have not heard any good reports on them... Maybe even a Solid Roller cam with around 700 Lift might be better suited to my build... Thanks Jamie...

 

I looked at a Solid roller cam from Doug Herbert Performance it has 685/683 lift, Duration @050 - 258/270, RPM range is 3'200 to 7'200, Also a solid lifter cam that has 690/690 lift, RPM range is 3'500 to 7'500 Duration @050- 273/273, Out of these two cams which would best suit my 557ci, I take it with any one of these camshafts I will not have to change my Valve springs ( 61649 heads 700 Lift ) I am now leanind towards the solid lifter with 690/690 lift, As its much cheaper than the solid roller but with a little more lift and duration.. Thanks again !

 

Jamie the roller cam is going to need different springs than a any flat tappet (ramp rates are much, much faster thus you need a lot stronger spring) without looking I don't know what springs came on those heads.
I would still do the port work on the heads, you have increased the CID of the engine and it needs to breath those heads are pretty good but on a 460 for another 100 cid you want them to breath better..
Yes the solid flat tappet is going to be cheaper but that one you listed is a single pattern cam and even the aftermarket heads like dual pattern on our motors for best performance. Also a solid roller cam will provide you with more power.

 

Monsterbaby, I found a Comp Cams Solid roller with 720/720 Lift, Duration @ 050 is 260/268. RPM range is 3'800 to 7'000. This cam has big lift but seems to be in the power range that I need for the 557ci, What do you think of this cam ? Can I use 10-5-1 or 11-1 compression with it ??? I did not think finding a cam for the 557ci build could be such a pain in the butt, Hopefully I can use this camshaft, I will have the valve springs changed to match cam and some port work on the 61649 heads....Regards Jamie, Australia. ( Car runs a 4 speed Toploader gearbox )