Don Terrill’s Speed-Talk

Restrictor plate intakes and spacers are an interesting thing. When they first put a 7/8" hole plate on the local circle track class for the coming season, most put a std 1" 4 hole spacer on top. I spent the winter on the dyno developing a combination of spacer that ended up 110hp better t...

Any data on what happens to the intake pressure wave and reflection under boost in the intake manifold?

shawn

Check your water delivery and return. Hoses and filters.

shawn

Here this is the one.....I know you Stock Eliminator guys are all wound up over friction losses and other BS and this is advertised as 10% increased volume but this IS THE PUMP to run in a wet sump SBC.....drill some big leak holes in you oil galley plugs in the timing chain cover or call an oil co...

The big throats work well with high lift cams. Probably because sonic flow is said to be more dependent on area than on seat geometry. Sims show some of the combos we've done stuff for to remain sonic across the seat through around .400"or so lift. So, area-wise the big throats may very well f...

Lots of assumptions being made that you can actually gather any useful data "flowing" an exhaust port..... shawn "Now that sounds just plain silly. The heads you see on the market today are directly the result of flow bench and dyno data. Do you know how long it takes to develop a he...

Lots of assumptions being made that you can actually gather any useful data "flowing" an exhaust port.....

shawn

I haven't seen anything that is newer. I try to avoid cast iron as much as possible lol.

Shawn

Sounds like a hybrid old school/new school comp motor with a little Cup thrown in for good measure. If it was me I wouldn't build anything bigger than 310", using the parameters layed out. You didn't say the heads couldn't be welded, you couldn't change the cam core size or lifter diameters. Ca...

Hi Al, we do quite a few of these deals for the late model pavement crowd. I use Ferrea lifters and p55 cores with 180lbs seat and 460lbs+ over the nose. This is the "typcial" stuff without having to get to exotic. Medium fast lobes with 1.8 rockers. Depending on the lobes you pick and roc...

Ditch the vacuum advance. Set the timing so that you have a minimum of 36* total, with springs that get it in asap. Sounds like you just need some basic tuning stuff. On our engine dyno I would think you'd see 480ish hp. Chassis dyno's vary, but somewhere 420-440hp I would think is realistic.

How much spring psi, what cam core, and what lifters?
shawn

Hey Nick

I was wondering when you were going to poke your head in here and say hi. You'll enjoy the conversation and people. Well, most of them anyway. Ha.
shawn.

Hey Ryan,
Try these guys-

http://www.a1technologies.com/index_flash.php

Good people and great products.

shawn

Naw, not to bad. Pretty std stuff setting them up. Making sure they clear on the inside of the head is the biggie. We use 3/8" pushrods on most of that stuff,and that can be a pain with the larger ratio's.
shawn