Don Terrill’s Speed-Talk

Typically what I've seen the best 062/906 with zero shift can flow 240 @ around .500 lift unported and thats rare. Ported with a 1.940 valve I get around 260 CFM @ .550 lift. A 291/462 fuelie flows generally in the high 190s stock round .500 lift. Ported with a 2.02 valve still thick enough to use ...

Flow is flow but velocity matters too, and the Vortec chambers are waaay better, they burn faster so you need less ignition timing. 3 top techs w/ 3 same benches in same shop on same day will rarely record identical numbers. +/- ten cfm is rather insignificant; and velocity is just as important. Im...

I know not all of them do, cause a buddy had one down that didnt ( saw it torn down) The Olds forums I'm on would DEARLY love to see photos of a solid-main-web 403. They've been looking for one for decades and never seen one. Wish I knew where it was now, it would look great beside the "imagin...

What would be a better combination? Engine must be under 10:1 compression, max .500 lift cam . Flat top pistons 350 max .060 over. Holley 4412 carb and 1.375 restrictor plate. And production exh manifold. And any gm head except bowtie. I have a set of camel hump heads with under cover porting from ...

Ken_Parkman wrote: ↑Thu Oct 08, 2020 1:18 pm I have a 85 Speed pro catalog, and it lists 7000, 7001, 7002, and 7005 as SBC pistons. Logical that 7003 is SBC prior to 85.

Yup, that makes perfect sense Thanks Ken!

George, I have looked through every book I have here and cannot find a thing. Maybe a picture would help someone recognize it ? I could take a pic, but they are the same as Chevy OEM domed pistons for 270hp/283hp motors. its possible they could be Jahns or Forgedtrue, they are out of a motor a frie...

Dan Timberlake wrote: ↑Thu Oct 08, 2020 8:59 am Hi Falcongeorge,

what oversize?

PdQ might want them for one of his dream engines.

just teasin' ya PDq

+.060 and PDQ can't have 'em, they're MINE!

George, I have looked through every book I have here and cannot find a thing. Maybe a picture would help someone recognize it ? I could take a pic, but they are the same as Chevy OEM domed pistons for 270hp/283hp motors. its possible they could be Jahns or Forgedtrue, they are out of a motor a frie...

Try looking it up in a Speed Pro catalogue. Domed forged pistons were not sold under the Sealed Power banner. They were sold under the Speed Pro banner. My 1990 Speed Pro catalogue does not list that particular piston. It lists 7044P, 7045P, 7027P & 7001P forged domed pistons for a 283 Chev. Yo...

Is there anything in the inside of them ? I have a bunch of old catalogs and interchanges at the shop. I will take a look in the AM if nobody else has answered. Nothing on the inside. I'm pretty comfortable 7003 is the part number, and they "look" like Sealed Power, but my 1980 catalog do...

I have a set of old forged factory replacement pop up 283 pistons (270hp/283hp) here, they are stamped #7003 on the tops, I THINK these are Sealed Power, but my early '80s Sealed Power catalog only lists the #2013PX flat tops, doesnt list anything for 270/283hp 283's. Anybody have a sealed power cat...

It is probabily too rich at idle... That is what makes the tail pipes black. The size of the carb has nothing to do with it. As F-bird has said size of the carb has NOTHING to do with running rich, in fact, if anything, too big a carb would tend to be lean. When you run a carb which GENUINELY has t...

Yup, more power everywhere that matters. BIG increase in mid-range torque with either the Weiand 1981 or the Edelbrock street tunnel ram as compared to what you have now. And agreed on two 750s I would absolutely use the holley double pumpers, they are going to be easier to work with. Be aware that ...

This begs the question what are the intake and exhaust valve angles for this Triumph? Both are 45 degrees from vertical...Dorset's engine makes a few more HP at a higher rpm than mine, but we are crowding 1.7 HP per cubic inch from a 1930's design production motorcycle engine.A well tuned stock eng...

From memory, the Pro Stock dual plug allowed more Engine setback. Thanks Randy Yes, thats right, well thats how racers ended up using it anyway. That wasn't the original intent of the D-5, but because NHRA measured engine setback from the centerline of the spindle to the first plug, when the racers...