Don Terrill’s Speed-Talk

I always thought it would be a good idea, particularly with ECU controlled fans, to have them come on at a quite low rpm when the car is stationary and the temp is over say 190 but but below the main turn on temperature. Have just a small breeze of air wafting through the radiator like the old days...

That seems to make sense. However, what doesn't seem to make sense is that other air cooled four valve designs don't suffer any overheating problems. For instance, the Suzuki DR650 and 800, the Suzuki LS650, the Yamaha XT600 - 660, the new Harley-Davidson Milwaukee-Eight Vtwin, and the Polopolous P...

They likely couldn't keep it cool. That's why Porsche never went to 4 valves on the air cooled engines. And the early 4 valve air cooled bikes had similar cooling problems.

Maybe look to see what Porsche did on their air cooled race engines and get some ideas on how they handled the heat. The Porsche "Moby Dick" 925/78 had water cooled 4 valve heads with air cooled cylinders. They did the goofy cooling just before throwing in the towel on air cooling altogether and goi...

Call up ARP and see if their VW studs are in stock yet.

WRT aluminum, the alloy usually used for high temp applications are RR350 or the less common NASA398.

Redline is often dictated by the cam and valvetrain, not the lower end. Make sure to get the lightest valvetrain components possible and talk to your cam supplier to make sure your cams won't float the valves at 7501rpm.

And if you put anodized or cad plated parts in them, the coating will be gone if left in for any length of time. Be careful and check often.

We just had this discussion in the Advanced Engine section. Since you're already starting out with thinner rings and likely a low tension oil ring, I doubt you'll see very much difference. Maybe 5 hp over what you already have.

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David, could that be a residual pressure check valve? If so, that could be his problem. Why the heck would someone put one on a disc brake car?

If people think a stock 5.3 out of a 99-05 truck is going to walk away from a SBC 350 Vortec engine, that's a laugher in my book. :lol: Like many things in life, you have to read the rules. ANY stock LS head AND a 4bbl carb on the 5.3. SBC gets a 4412 500cfm 2bbl and a cast iron 2bbl intake. And th...

Sounds like it's not a hydraulic problem at this point, since everything's been replaced. If you're running a spacer to even the ride heights, then for sure I'd scale it and see how much cross weight you have. Also, since in the beginning you mentioned that it might be a suspension problem, any diff...

Run the 5.3 core, change the cam, call PSI and get some valve springs, put on the circle track oil pan, and go racing. If it blows, take off the oil pan and intake, cam and valve springs and go on to the next one. If they can claim your carb, find a cheap 4150 at least 750cfm and be done with it. Oh...

Why would anyone run the old crap? Auto wrecker engines all day long (5.3L) FTW. Decent pan and class required peripherals to run the engine, why would you spend money on building an engine? Bingo! I wouldn't even be picky about the cylinder heads and run the junkyard engine as is and concentrate o...

Are you a promoter or competitor?