Don Terrill’s Speed-Talk

ChopperScott wrote: ↑Fri May 03, 2024 10:18 am It is rare to receive feedback after delivery, much less with comparable A-B data.

Seriously? People don't give you updates on how much your work improved their ET / MPH / whatever?

Anyone got any thoughts about the booster response curve and/or the booster feed hole size regarding the trends of that carb on that engine? IMO, Holley QC has gone downhill; OP should get some larger pin gauges and verify the boosters' feed hole sizes, as well as making sure they are machined prop...

Your work looks nice, but I'm interested in how many "before" and "after" comparisons you have from either dyno or on-track testing. In experiences with my own intakes, one in particular that I worked on got a lot of plenum "corrections" to a compromised as-cast design,...

FWIW... https://www.motortrend.com/how-to/ccrp- ... omparison/

The aluminum HP main bodies use the same bleed locations as the XP. The don't have the idle air bleed and they don't have stepped boosters like the XPs.

Engineering at Edelbrock was fun in some ways, but the problems out in the manufacturing shop are too frustrating and demoralizing to design for. I designed an RB Chrysler head for 383,426,440 engines that was a huge improvement over the previous head. The foundry tooling was made by an outside sup...

Your description isn't very clear... what changed between _3 and _4? Was there a carb switch? If so, what was the first carb? Thx

FWIW, viewtopic.php?f=1&t=59722&p=843049&hili ... ll#p843049

Had to go re-read the Speedmaster release to see exactly what they stated: "Speedmaster is proud to announce the addition of Fredrick (Rick) Roberts PhD as North American Director of Engineering. Rick is well known for serving 28 years as Edelbrock's Director of Engineering and played an integr...

OK, I'll throw in two different things here that *may* fit into the discussion above. First, a bunch of stuff I posted elsewhere about a decade ago re lash settings and measured duration points: https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/1277696/Searchpage/1/Main/113458/...

Thanks to Larry for the Picture of the Roy Hill driven Mopar, and Thank you Mike ( CamKing ) and every body else who contributed to this thread, it was a dream back in time and was enjoyable. Mark H. :) Re Roy Hill; one saw him race once, the U.S. Pro Stock Open in either 1976 or 1977. He and his D...

I'm surprised nobody has dug up their dog-eared copy of Grumpy's SBC race engine book from the mid-70s where he goes into a lot of detail on what he ran for cams...

SOLD

I dug up the following after reading this thread. I don't recall where I came across it, and must not have been interested in whatever "Stage 1" and "Stage 2" were cuz I didn't bother taking screen-shots of them for reference at the time. Similar concept, except the PCV valves ar...

I did a search and didn't notice any existing threads that talked about this, or certainly nothing recent. Have people found power improvements going from production-line lifter bores to bushed & indexed lifter bores? FWIW, I'm dealing w/ old Chrysler 440 cast iron blocks and solid roller lifter...