Don Terrill’s Speed-Talk

Glad you figured it out. I kinda figured that it wasn't your original filter setup.

On marine applications, is the vent on the fuel pump supposed to go into the intake tract?

... As mentioned the exhaust system is a much over looked part of the chassis when it comes to lower class racing and some guys are content to not seal the interior well either making it a potentially deadly situation. The house that I first lived in in California had a murder-suicide in it. My Fat...

PackardV8 wrote: ↑

Mon Jul 06, 2020 6:30 pm

Isn't there a backstory about Jack Roush using generators to load his engines and selling juice back to the utility?

I know that during WW2 the aircraft engines were run on dynos and the energy was used to power the rest of the factory.

I guess this was one "benefit" of working for a GM dealer who had been around since the '30's. The tool that I remember seeing to install the balancers on undrilled cranks bolted to the front motor mount bolts (The ones under the water pump, not the ones on the side of the block). Mind you, I never ...

Back when super stock required stock valves, we couldn't reliably keep the stock 4V cleveland valves from popping the head off of the stem. There's no way in hell that I'd trust grinding the stem diameter down on one. Especially now that cheaper, better quality valves are available. That whole thing...

Those look pretty low in the chassis. Are you running a scavenge pump on the drains? As far as the gaskets, most manufacturers have moved away from paper and cork gaskets and use either a variation of silicone and a steel shim, or clean up everything and run no gaskets and just some variation of Thr...

They are slow, but they do a pretty decent job otherwise. As a DIY'er, at least you're forced to sneak up on it and not ruin the seat like when using stones.

For me, I sometimes use them when flow testing and can flip the head over and try different widths or angles pretty quickly.

Porsche did use the aluminum ones from '65 to '95, IIRC. BUT, if you race in SCCA in anything other than a stock class, you'll need steel open center lug nuts.

We ran fuel filters on the suction side with mechanical pumps for decades in all of nascar. And big rigs with mechanical fuel pumps have what, a 4 ft vertical pull from the bottom of the tanks to the engine mounted fuel filters? And with 500 sq in of filtering media, I doubt it's the problem. But in...

You could always tee a vacuum gauge on the inlet side of the pump to see if there's a restriction in either the plumbing or the filter element. The pump itself should be able to pull at least 15" Hg vacuum. When running, any vacuum means a restriction. If it runs good with a full tank, what changes?...

First thing to do is to wire the water pump/fan switch to a 210 degree snap switch near the upper radiator hose. Wire it into the hot side of the switch so that if you forget to turn on the switch it'll still turn everything on at 210. If it overheats at anything over about 30 mph (and the engine is...

740hp @6200 = 626 lb ft tq at 6200 but you said the dyno peaked at 620 lb ft tq? Are you sure those numbers are accurate? But back to basics and lets assume that it made more power on the dyno than the last combo. What changed when installed in the car? Is the fuel system up to task? And more basic,...

Let the size of the valve stem dictate which reamer you use. You'll want to check the factory spec for clearance and use that as your guide unless you're racing. If it's a track vehicle (as opposed to street or drag strip), it's likely that you'll want to add 0.001" clearance to the factory spec. As...

Well, you could, but the tools aren't cheap and you'll have more money into even buying the cheap tooling than just sending the head out. But if you really want to, and time is of the essence (considering their turnaround time), call Neway manufacturing and tell them what you're working on and they'...

When the stuff really mattered, (i.e., expensive race heads or my own stuff), I'd ream by hand, then check concentricity. I'm sure that others have a preference.