jerry2004

Hey all just had a random question. I was wondering if there was a way to get the lift measurements without tearin down the whole motor because the kid i bought my car from lost the card that came with it.

RamAir95TA

An accurate way? Not really.

jerry2004

im just lookin to get a rough estimate now until i get a chance to tear this thing down and change the rings bearings and all the fun stuff that i should have done right after buying the car but didnt take the time to do

lt1-xjs

For just a lift measurement put a dial indicator on the retainer and measure its total travel. For the lobe lift divide by your rocker ratio.

1963SS

Yep, like stated above. Use a dial indicator and set it to zero on the lowest part of the cam. Rotate the engine until max lift is shown. Multiply that figure by 1.5 or 1.6 to get your valve lift. I use 1.6 shaft mount rockers. In the example below....my dial indicator shows .408 lobe lift. If I multiply that by 1.6 I get .653 lift at the valve.

jerry2004

thank you guys very much i will have to get this done as soon as i get home just so i can ease my mind because i know it has a healthy cam in it just not sure of size. Here is a video just because

[autostream]http://autostream.com/camaroz28/?page_type=firebirdplayerthumbnail&framepage=1760& transactionid=1316508331-626886234&posted_by=jerry2004_www.camaroz28.com&yo utube_video_id=b1Rqc2sFTZI[/autostream]

and if you expand the more info on the video there is alot of what the car had done and of course this video was done by the previous owner.

lt1-xjs

Sounds like the cc 503 to me.

TGGodfrey

You should never take the lift and duration measurements at the retainer. Hydraulic lifters will give you erroneous measurements everytime. Just like degreeing a cam you MUST take the measurement at the lifter with no preload or pressure on it. Meaning the pushrod must be removed.

The method above using the pushrod with no rocker is a way around taking the intake off but be very careful how you setup the dial indicator becuase if it isnt set in a manner that maintains proper geometry then your going to get another bad measurement.

Terry

MachinistOne

Yep.

The dial indicator in the picture posted is obviously not parallel to the push rod and that induces a cosine error, lobe lift is actually more than is being shown on the gauge.