Don Terrill’s Speed-Talk

Has anyone measured flow in both directions to determine the difference in flow? I did this once for an intake manifold device, intuitively it looked like it might be AR, the flow difference was insignificant. I ordered a pair of the 3" in /3". Out. Since they were all Dynatech had in stainless. It...

For those guys who just HAVE TO buy a cam to get that "classic" lumpy idle, small and fast-enough headers and AR mufflers seem like a good idea, so I have to ask: Do these AR devices reduce the lumpy idle sound? (That could be a "downside" for some people.) (Is the sound primary driven by OVERLAP o...

The missing disc in one would’ve been grounds for me to just replace all of them while it was apart. But I’m completely guilty of trying to make stuff work when I have my doubts so no judgment from me

Adding to my above comment. The AR devices I included in the pics are 3” inlet and outlet, but the internal portion tapers down to 2 1/2”.

I placed my AR devices at the inlet side of my x pipe so that I still had a good amount of collector extension ahead of it.[/img]

You can raise the manifold up by using a 1266 gasket which is thicker instead of a 1206. Will give you a better seal width up top. Be mindful that you check to see if you’re still sealing at the bottom of the port.

...I think the one above has that plastic extension where the Speedway Motors doesn’t have that, so maybe that’s why its a bit more...but 3x’s more it better come highly polished... That looks like the vent whistle that most HP metering bodies include. Another cap is in the lower right of the pic. ...

I’m currently running a set of copper mr gasket head gaskets on my sbc without o-rings. Stock deck height so I wanted something thin. Copper sprayed them thoroughly and haven’t had any issues.

Didn't see the tests...what are the bsfc's for each and is there an average given or just peaks? They tested for that, but didn’t disclose the information. So either it was insignificantly different or they felt that presenting that info would be going too far into the weeds for the general audienc...

What I found of interest was the difference in ignition timing requirements. The longer rod ran best in the 34-38* advance range and the short rod ran best in the 40-42* range. What got my attention and had me scratching my head is they said the long rod was insensitive to timing and ran the same f...

What I found of interest was the difference in ignition timing requirements. The longer rod ran best in the 34-38* advance range and the short rod ran best in the 40-42* range. What got my attention and had me scratching my head is they said the long rod was insensitive to timing and ran the same fr...

Even if the jets remain covered and regardless of what is happening with the float and needle and seats, wouldn’t the relative increase in fuel level at the front metering block and the decrease in the fuel level at the rear metering block directly affect the emulsion circuit. As well as provide a ...

Even if the jets remain covered and regardless of what is happening with the float and needle and seats, wouldn’t the relative increase in fuel level at the front metering block and the decrease in the fuel level at the rear metering block directly affect the emulsion circuit. As well as provide a i...

Hi guys, i want help , i assembling a 406 sbc and might have an issue with the tall body 4602 morel lifters. it is very Close from the oilband to the edge of lifter bore at full lift , when i measure its like .175" ( 4.5 mm) until the lifter is "out of the bore" sort of speak ,, the camlift is: 577...

Offset lifters introduce a torsional/rotational load on the lifter that doesn’t exist when the pushrod cup is centered. Personally I’d avoid adding the extra element of stress unless it was absolutely required to make the setup functional.