Best camshaft for ported iron heads

James Sample

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I'm building a 500 out of a '70 472 block. So far I have forged Cadco 10:1 pistons and forged rods, and Cadco Pro Street small chamber heads. Maximum lift for my heads is .600". I've been procrastinating on a camshaft and still have no idea what to get. I want maximum torque between 3-5k and a redline around 6k. The engine is going in front of a switch pitch turbo 400 so stall speed shouldn't be a problem. Also this is for a '70 DeVille. I'm willing to go with a roller camshaft but I don't want to pay more than 2 grand for a cam, lifters, and rods. Flat tappet seems like it should be fine too. What say you?
 

Cadillac Kid 1

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Just to start this conversation my motor makes max torque between 3-5,000 and I needed a 3000 rpm stall converter to make it manageable. I’ve got a roller with a 258/256 at .050 and a little more lift than you say you want. If you plan on going this route you are goo oil ing to need a good shaft rocker arm set up, so $2,000 might be a bit light. I also found that 6k jaunts require some oil system mods. These motors are low speed torque motors not Chevys. I’ve got a CadCo SS300 cam that I ran for a couple hundred miles that made great power on the street and would work with a switch pitch converter. I pulled it and kept the lifters numbered so they could go back into their original positions when and if I used the cam again on a 10:1 motor. I listed it on the classified a while back but if you might be interested pm me.
greg surfas
 

James Sample

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Should have mentioned I do have 1.72 ratio non-adjustable shaft rockers to go with my heads.
 
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G-619888

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Mandatory for just about any high performance cam so you are that far ahead. Did I fail to mention the need for rocker arm covers that will clear that valve gear?
Greg Surfas
 

James Sample

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Funny that you mentioned that. I just noticed that aftermarket valve covers aren't plentiful and cast aluminum ones are quite expensive compared to say a Ford or Chevy motor. I saw some 1" spacers on eBay that seem reasonable so I may go that route
 

richie49

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James
Are the shaft rockers the ones that CHP sold before they went to S--T?
I have my 1.7 shaft rockers under stock valve covers. The adjustables need more room because of the adjusters. I might have just been lucky. Maybe you can do the same. Those adapters are high $ . Good luck with your project.
Richard richir49
 

48Austin

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Funny that you mentioned that. I just noticed that aftermarket valve covers aren't plentiful and cast aluminum ones are quite expensive compared to say a Ford or Chevy motor. I saw some 1" spacers on eBay that seem reasonable so I may go that route
Paid close to 500 semolians for these with shipping 1629937142957.png But what the hell! Early Cad script on a late model valve cover? Had to havem'! Besides. Who ever the Cad Gods are may cut production at ANY TIME! Not like there are a alot of guys runnin Cads.
 

48Austin

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OH Yeah! Almost forgot! only ONE!! REPEAT!! ONE company makes aluminum covers for the big Cad. Could stop at any time without notice.
 

James Sample

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The shaft rockers I have are Cadco stage III's. They're basically a Ford (FE?) iron rocker on steel shafts supported by an aluminum girdle. They have oil passages added from the pushrod through the rocker arm. They're sturdy looking.
 

James Sample

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So, assuming I have the right valve covers and good rocker arms; do I need a roller camshaft with less than .600" of lift? How much duration do you want with a 10:1 motor?
 
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