Need Input-Cam Selection

Old May 15th, 2019, 04:55 PM
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Need Input-Cam Selection


Need input on cam selection. 67 Olds, 3400lbs (lightened), 468, 9.76:1, Speedmaster Alum Heads, Torker Intake, Roller Rockers, Rhoads V-Max 2nd Gen Bleed Down Lifters, 3.55 posi, 200R4 w/2500rpm stall (9.72:1 total 1st gear). Planning on installing a nice Lunati Voodoo (227/233 @.050 w/.511/.523, but have a big Engle too (248/256 @ .050, .548/.566. Will this overall combination be streetable with the big Engle? HP differrnce btw the 2 cams?

Last edited by Chris6542; May 15th, 2019 at 04:59 PM. Reason: Forgot details
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Old May 15th, 2019, 05:38 PM
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Engle is too big no matter what, even with the Rhoads lifters.
Anything done to the heads?
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Old May 15th, 2019, 05:56 PM
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Nothing done to the aluminum heads (though stock, they seem pretty darn impressive).
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Old May 15th, 2019, 08:57 PM
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Have you already assembled the engine or are you just gathering parts?

IMHO, if you plan on keeping the torque converter you have (2500 stall) and you want it to be a fun and peppy street car, go with the smaller cam.

If you were willing to go up to about a 3500-4000 stall, you could make the bigger cam work well, but you would have to keep the converter a lockup version to make it useful with your overdrive trans, as well as not shifting into 4th and lugging the engine into overdrive when you are doing less than 70mph...

Also, You would really want to upgrade to bigger intake valves (up to a 2.125) and do a little port work as well on the bowls, and have the heads milled quite a bit to get the compression up to at least 10.5:1 or better. You will need to check the valvesprings for pressure to make sure they can control the cam, as well as upgrading them to make sure they don't break or coil bind. With that big of a cam, it will want the increased compression, as well as the aluminum heads will allow you the higher compression without detonation on even pump gas.
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Old May 15th, 2019, 09:04 PM
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I assemble next weekend. Those are great thoughts. While knowing it would be a respectable 1\4 mile var matters to me, ultimately it'ss a fun weekend car. The Lunati Voodoo is a really nice cam that should be great in my combination. My gut feel was the Engle was too much, as others in this thread said as well, the Lunati it is. Guess I have a big Engle (never run) cam I could sell.
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Old May 15th, 2019, 10:38 PM
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I think you will be very pleased with that smaller cam for your combo; good luck on the build and keep us updated!
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Old May 15th, 2019, 11:19 PM
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I disagree, sorry.
Were the heads checked for cc? They’re not 77 from the factory as described. What pistons do you have?
And unless you’re above 4000’ feet or so I would not go to “10.5 or better” if you’re not going to run race gas of some sort, even if you used the big cam.
A cam with duration in the low to mid 230’s and with more lift would be best for your combo based on the stated compression ratio.

Last edited by cutlassefi; May 15th, 2019 at 11:22 PM.
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