First time down the track

67Cuda408 said

I haven’t put the engine in the dyno so it is an estimation but given the specs of the parts used I don’t feel like that estimate would be 150hp off. I did leave very conservative for fear of losing traction but the discrepancy seems to large.

I have not flash stall tested the converter. How would I go about doing that?

I plan on doing a compression and leak down test maybe I’ve flat spotted a cam lobe? I’ll post what i find and appreciate all of your input and help finding the half an engine I lost.

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Believe it or not, your mph won’t change much from traction loss. You can either spin off the line or hook and your mph will be nearly identical. The only thing that really changes is your ET. That’s the beauty of the track is that your mph will always tell you the power you are actually making. Doesn’t matter if you hooked well or not.

With a manual valve body, you would put it in 3rd gear at a slow speed like 30-40 mph and nail the throttle from a near idle. Where the tach stops and holds while the car accelerates tells you the stall your converter is providing with your combination. Without the manual valve body, the car will kick down a gear and will rev past your stall speed so that will be more difficult to figure out as previously stated by Brian.

But keep like you’re doing and get the easy things checked out first. Back the timing up, check the compression and/or perform a leakdown test, and read the plugs (there’s an excellent write up on 4secondsflat). See that those things are in order and then continue the process of elimination.