Don Terrill’s Speed-Talk

To get a better understanding of this situation with stick shift and maybe help the OP. Engine is not yet assembled. What is the better choice in this situation: Leave compression as is and choose camshaft IVC that will help prevent combustion issues but likely shift torque curve up in rpm but make ...

If all it took was a later closing intake valve a Pro Stock racing engine would run on 87 octane gas. It doesn't. Your engine is going to want 100 R+M/2 octane gas. For street use on a pump gas retard the timing as required to avoid detonation. 4-6-8 deg as needed. Water/methanol injection does won...

If all it took was a later closing intake valve a Pro Stock racing engine would run on 87 octane gas. It doesn't. Your engine is going to want 100 R+M/2 octane gas. For street use on a pump gas retard the timing as required to avoid detonation. 4-6-8 deg as needed. Water/methanol injection does won...

Is the bottom end together yet? Grinding on the heads is hard to put material back if you want that 52cc’s in the future without having to surface the head. Haven’t mentioned what engine but can the pistons have 3cc’s taken out somewhere? Of course if it’s a crap chamber then reshaping may be the be...

In my reply to Tom above, I thought the test had lost some of it's merit with HEI to traditional small cap. That said, if both were locked at 34°, then what? That would have revealed the differences in hardware and electronics as opposed to differences in timing at various RPM. My thoughts are any ...

Tom68 wrote: ↑Sat Apr 06, 2024 8:35 pm

HQM383 wrote: ↑Wed Mar 20, 2024 9:23 pm
Weighs 3350lb on the scales on the ring rd BP.

If you go to Calder you'll have to drop in and put it on the individual wheel scales.

Scaled this beast recently.

20240331_082121.jpg

Does it need to go on a diet?

This Holley Street Dominator was my intake on the late 70's early 80's 400 SBC street terror I built while in college. Does anyone have an opinion on how that old tech stacks up today? After 50 pages, it may have been covered here but I missed it. 50! https://www.youtube.com/watch?v=G_KBV8JBnLY&...

Progression Ignition... Did you manage any A to B testing with the Progressive compared your best results ignition-wise? This came back to me while watching this 406 dyno test on the Unity MotorSports Garage channel. If you do/have seen it, what are your thoughts on the results? https://www.youtube...

it didn't need any Jet staggering , mostly because 2 Spacer's added Plenum height causing largest amount of the Mixture to go downward into the top portion of the Runners . The Manifold picked up TQ and HP everywhere . from previous experiences , i was not too afraid to Weldup and extend the Runner...

Mike Laws wrote: ↑Sat Apr 06, 2024 8:24 am Cale said the manifold wasn't the best on restarts.....

I assume that is when more of the fuel is being drawn from deeper in the plenum at partial throttle?

DSC03108_1280x960.jpg DSC03114_1280x960.jpg DSC03116_1280x960.jpg DSC03127_1280x960.jpg DSC03140_1280x960.jpg DSC03142_1280x960.jpg DSC03143_1280x960.jpg DSC03144_1280x960.jpg DSC03147_1280x960.jpg DSC03148_1280x960.jpg DSC03154_1280x960.jpg   Larry, do runner extensions this long have any side eff...

Anybody have pics of their work? DSC03108_1280x960.jpg DSC03114_1280x960.jpg DSC03116_1280x960.jpg DSC03127_1280x960.jpg DSC03140_1280x960.jpg DSC03142_1280x960.jpg DSC03143_1280x960.jpg DSC03144_1280x960.jpg DSC03147_1280x960.jpg DSC03148_1280x960.jpg DSC03154_1280x960.jpg   Larry, do runner exten...

vortecpro wrote: ↑Sat Apr 06, 2024 2:05 am New best after carb mods in 1600 DA, thanks everyone for information. I think its possible when we get back to the good track to see a 1.40 60.

Mods to the 4781 as outlined in this thread?

Thanks. Is that measurement at( under ) the step? I take the step to .490. What is the smallest inside diameter of the booster? Usually the Holley booster measures .380 smallest portion. Had to correct that. Braswell steps out to .525” The one in the photo I said was std is actually a Demon booster...

HQM383 is the Braswell down leg booster a larger diameter , particularly inside entrance? Inside is under .010” larger diameter- .431” v .440”. However the outside diameter is larger by around .057” and taller by around .060”. The extra height puts the booster air exit lower in the venturi by the h...