Don Terrill’s Speed-Talk

those #461X Heads are much better looking now , than the Pics above are in previous Posts ! i went to 320-Grit finish in Bowls and Chambers instead of wornout 120-Grit Roll as in Pics reason : for these old cast-iron Heads to help stop a crack from forming plus some little rust spots kept popping up...

.... Sorry , i just saw this Thread today ! :oops: just had a new Dynomation update : Version 6.03.37_CD_DL on 3/29/2024 this new Dynomation version predicts these Results using PipeMax v4.90 Harmonic Lengths for Peak TQ occuring at 3900 RPM and for Peak HP occuring at 5900 RPM Power Band width = 20...

vortecpro wrote: ↑Sun Apr 21, 2024 6:20 pm Larry

I just bought a brand new set of 292 castings, I'd very much like to send them your way!

Email me all the Engine details for those #292 Turbo castings

Larry, I'm a bit confused. WHAT IS THE NUMBERS MATCHING TOO? Does this have a 1969 Camaro VIN stamped on the block? WAY more than 71 as a least 75/77 made there way into cars, 69 Camaros and at least 7 known Vette's, 3/4 are said to be OEM ZL-1s. GM did a bunch in Vette test cars too. There's a pic...

Wow, how long have you had that jewel laying around or is this something GMPP is selling now? Chris at C & S Performance bought it and sold it to his Customer its original COPO 1969 Camaro version , should have more Pics + Dyno video/sheets soon i'll ask for more details . Chris is not 100% sur...

COPO Camaro original ZL1 version 427cid + just Dyno tested made 530+HP ??
with very thick Headgasket to lower CompRatio for Pump Gas ,
with new Cam Motion Low-Lash Solid Roller Cam , 514+ Peak TQ

Original OEM ZL1 427cid numbers matching ( Winter's Foundry SnowFlakes )(Camaro version) going into 1967 Chevelle restoration brand new ZL1 Holley Carb in Box never used , never had Gasoline in it substituded ProSystems Holley Carb has original Transitorized Tach Drive Distributor, not used here , ...

 

racear2865 wrote: ↑Wed Apr 17, 2024 12:03 pm I am trying to reach Pipemax. I purchase the 3 package and I have on 1 pc. Need to install on another pc. Instruction was on old email that ATT canceled because it was spammed. How do I proceed from here. 76 years old and still lost

i just sent you a Private Message

SuperFlow_Friction_Factors_accuracy examples :
 

by Rick! » Tue Apr 16, 2024 7:52 am For the OP, here's a screenshot from an ET Predictor based on Pat Hale's Performance Racing Atmosphere calculations. (a modified version of SAE J1349) I believe Larry's program uses Pat's CF calculations. I also use some formulas off of epi-eng.com for water vapo...

Larry, What are you using for Cd and FA? I long time ago I found somewhere on the internet. 70 Chevelle .42 Cd 25.52 FA Stan i did a very quick Simulation for Mark's 650 HP ... i didn't fine-tune it or nit-pick it however, i came out pretty close to reality :) VortecPro_DragCoefficient_FrontalArea....

.... this would be an "Ideal Run" that would show 650 Peak HP with a very flat TQ and HP Curve
something to shoot for !
 

RCJ wrote: ↑Sat Apr 13, 2024 5:02 pm Page 2 about 1/3 of the way down, there is a picture of an exhaust port with expoy in it. I have a set of heads somebody hacked the exhaust port at the header flange. What epxoy are you using ?

No epoxy there ... instead that's Brazing , welding Brass to bottom of Exhaust Ports