Cam Question?

quickstang1983

quickstang1983

Club Member
My current cam is an AFM b4 hydraulic roller which is fairly mild (224/232 .542/.563 112) . I have a cam out of one of my old motors (.586/.586 [email protected] 110) but I'm curious how it would run in my current setup. The old motor I had it in was 14:1 compression. My current setup is around 8.5:1 (dished pistons). I start floating the valves at 6800 with my current setup. The old cam is a solid flat tappet and it pulled hard all the way to 7200 without floating the valves. My question is would the old cam still work as well in my low compression 331 as it did on the old high compression 306? I run a 4.56 gear in my car right now but it signs off at about the eighth mile mark. I'm hoping that by swapping in the old cam I can better utilize having the 4.56 in the car. I'm just curious how the old cam will perform in a 8.5:1 engine compared to the 14:1 setup. Any thoughts would be greatly appreciated.

On a side note my current setup is currently good for 11.50's-.60's running out of gear around the 1/8th (maybe a hair after). I'm curious what the bigger cam will offer me et wise. Thanks, Jake
 
what intake and carb do you have?? id say it would make a decent increase and definetly be able to use up that gear.
 
ok then i think the bigger cam should work well. the only thing that could potentally pose a problem would be the duration. just make sure you do a ptv check before you run it.
 
foxbodydave said:
ok then i think the bigger cam should work well. the only thing that could potentally pose a problem would be the duration. just make sure you do a ptv check before you run it.
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That is my biggest concern. DSS claims to cut deep reliefs for big cams, plus i have dished pistons so I think it will be ok. My old motor had big domed pistons and it worked out fine, although it did have very deep valve reliefs cut into them. I don't plan on pulling my heads off so I sure hope it will work.
 
ok well then what i would do is when you put the cam in, pull all of your spark plugs out and slowly rotate the motor over by hand, but try to do it when it is the quietest out so you can hear if your hitting or not. its not the best way to do it but its better than nothing
 
foxbodydave said:
ok well then what i would do is when you put the cam in, pull all of your spark plugs out and slowly rotate the motor over by hand, but try to do it when it is the quietest out so you can hear if your hitting or not. its not the best way to do it but its better than nothing
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Thats what i planned on doing. I just hope its worth it! I would hate to get it all buttoned up just to find out I picked up a tenth. I think it will pick up quite a bit more than that though.
 
you can do a ptv check without pulling the beads, just install light springs on the valves so u can push them down by hand( like on a flowbench), put hte cam into overlap, set up a dial indicator on the valve and push it down untill you hit, subtract your cam lift from this number = ptv clearance
 
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