Don Terrill’s Speed-Talk

Certain valve events are appropriate for different criteria.

I have witnessed advancing a single camshaft, gain more power upstairs ... probably because the exhaust valve opens sooner and the exhaust needed the most help.

They only work "half way decent" at minimal valve spring forces.

SpeierRacingHeads wrote: ↑Mon Feb 19, 2024 7:09 pm A stocker valve job does not seal on the 45 seat!

Not all heads have O.E.M. seat angle of 45 degrees ... though, that seat angle rule does not seem to be enforced these days; I think the newest rules, as written for the last few years, may even have that part deleted.

You get to do lots of R&D to determine what valves and angles will yield the best results. Lots of flow bench testing to get results. Basically no modification to the ports, no grinding, no sandblasting, no nothing... Each head design is unique and wants different things. What combination is it...

I just punched a 2010 Camry with a 2.5L engine after driving it for 3K I found out it is using 1 qt every 1000 miles. MFG call for 5w20 I am using 10w30 full synthetic which is expensive I a m thinking of switching to convention 10w30 much cheaper. Any opinions or real world experience. Not enough ...

An engine on the dyno does not take into account the G-forces involved at the starting line of a drag race and throughout the entire run.

SO, just be aware.

I have never seen problems with the holes pointed down. It is easier on installation to align the holes with the main bearing holes, so I have seen a lot of engines installed that way. Maybe with really big spring pressures there are issues, I don't deal with engines with over 600lbs open pressure....

Right now would consider all - obviously hard to find someone them.Any part numbers and a/b heights on any of these? Theres a 3947801 - a c400 ? will need some pad heights . Theres a guy near me has a c454 but I think thats too tall and rect port If you can find one ... the old Holley "Street ...

lewy-d wrote: ↑Thu Feb 08, 2024 11:44 am I searched. So far I've found Calico. What are other companies that will DLC a set of wrist pins?

thanks,
Lewy

I use Casidium coated parts from "IHC Industries" in North Carolina.
704 489-1488

ok all , been faffing with hood clearances and my best bet fit a cast iron ( NOPE) or a low rise dual plane aftermarket - Yes. Going in a bbc 427 with a 221/226@50 cam , after idle to 5500/6000 rpm performance , snappy throttle , good street manners , push me back in the seat. Performer rpm won't f...

Geoff2 wrote: ↑Wed Feb 07, 2024 12:23 am Another benefit of the stud girdle is less lost valve motion due to flexing.

AND, flexing is part of the reason they start to pull out ...

mag2555 wrote: ↑Mon Feb 05, 2024 5:11 pm Just who makes a girdle for poly locks that work with stock studs anyway?

Girdles with poly-locks for a 3/8" stud are available from many places; directly from JOMAR, for one.

turbo camino wrote: ↑Tue Feb 06, 2024 7:29 am photo_1338270531114-2-0.jpeg

am i rite or whut

Some trash seems to have invaded most of the sections on here ...

Good day, I'm wondering if there are accepted values for seats and if they change for a steel vs bronse seat and froma stainless to Ti valve? I know usually you will have a finer stone to grind the Ti valves than stainless...and assume it's not a bad thing to use the fine stone on the stainless val...

I have a set of -416 sbc heads that I've ported. I want to run something like the Summit CT-102 solid FT cam with them. Likely around 330lbs spring pressure open, and don't want to have pulled studs. I know that pinning the studs is an option, but wondering as well if a stud girdle could also help ...