Re: Valve to Piston Clearance with .528 Mopar cam in a 71 440
[Re: Cuda_Mike]
#2250032
02/08/17 11:56 PM
02/08/17 11:56 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I would swap a pair of light checking springs on there with the on head compressor & also use a pair of junk hyd lifters with the cup JB welded at the dimention down from the spring that is the preload that you plan to run (OCD maybe but thats me). that'd be an excellent opportunity to do the myriad of other related clearance checks at the same time then if you are good then you are good & can move on to other areas. Preload/VP clearance/WIPE PATTERN/pushrod to rocker/retainer to rocker/seal to rocker/coil bind/pushrod end view right angle at 50 or 60% lift (see Hughes engines checks)/degree cam. take nothing for granted.
live every 24 hour block of time like it's your last day on earth
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Re: Valve to Piston Clearance with .528 Mopar cam in a 71 440
[Re: Cuda_Mike]
#2250167
02/09/17 03:20 AM
02/09/17 03:20 AM
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Joined: May 2011
Posts: 625 Oakville, Wa
HOTMOPR
mopar
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mopar
Joined: May 2011
Posts: 625
Oakville, Wa
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I run a 305 .525 comp cam with a lot of room left. big vlave 906 heads both decks just checked for flat..
67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
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Re: Valve to Piston Clearance with .528 Mopar cam in a 71 440
[Re: Cuda_Mike]
#2250501
02/09/17 06:06 PM
02/09/17 06:06 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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Yeh, it's best to check it....... But...... A mp 528 cam in a 440 with pistons down the hole .085 "shouldn't" be a problem, unless the heads have been milled a bunch.
The down n dirty v2p check is....... After decreeing the cam, put a couple of checking springs in one cyl. Install rockers, adjust valves, then put about .100 worth of feeler gauges between the rocker and valve. Turn the motor over in the overlap period of the timing events, and stop every couple of degrees and depress the spring(with the feeler gauges still between the valve and rocker) and see that there is still some clearance. You'll notice the clearance gets less and less with each added bit of crank rotation, but at some point(around 10deg atdc for the intake, 10deg btdc for the ex) you'll feel the clearance start to grow again. If this happens you know you have at least the amount of the stack of feeler gauges of v2p clearance. If you find the clearance goes to zero while you're turning the motor, then you know the clearance is less than the stack, and you can make the stack thinner to get a better idea of what you have.
It's really quick and easy, and doesn't require setting up the dial indicator.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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