Hyd. FT cam for vacuum class truck puller

This is a all cast class. 466 with flat tops,.040 quench,C8 ported heads,SCJ intake and truck manifolds. Need some suggestions on cam. Need to pull 14 inchs vacuum.

Green 72 wrote:This is a all cast class. 466 with flat tops,.040 quench,C8 ported heads,SCJ intake and truck manifolds. Need some suggestions on cam. Need to pull 14 inchs vacuum.

Not enough information:
1. what actual compression ratio ?
2. what diameter valves
3. What intake manifold modifications ?
4. what carburetor ?
5. Exhaust Manifolds ... what size pipes ? mufflers ?
6. how much ignition timing does the vacuum advance have and add to that RPM mechanical advance ?
7. at what RPM is that amount of vacuum needed ?
8. hydraulic or solid lifter ?
9. valve train and cylinder head valve lift limits ?

Randy CR should be 11.5,2.19 1.71 valves,intake has opening modified to just devider in center not 4 holes,has to be single inlet carb,exhaust wil be 2 1/2 with straight thru mufflers do not know about timing,heads have 930 Com Cams springs but can be changed if needed any help Randy would be a great help.Thank in advance.

Randy vacuum needs to be at 1000 rpm and it is hyd.cam. Thanks for your quick reply.

Something custom would certainly be best however, with vacuum advance adding 20 degrees at 1,000 rpm, a catalog Lunati Grind # 61003 VooDoo would work; part number 10340703.

Thanks Randy

Green 72 wrote:Thanks Randy

I was quoting from memory ... the actual Grind # is 61603; the part number is correct.

These vacuum rule classes are the truest testament to the phrase "Devil's in the Details". To get these cams right you need to do the following: Flow the induction and flow the exhaust....meaning the heads need to be flowed on the intake side with the carb, intake and heads bolted as 1 on the flow bench. Then the exhaust with the headers to be used. Engine combination being used must be detailed.

If the above is done then the truck will be exceptional.