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Something I have never understood, my motor is 410 CI and for the sake of argument say it is has 100% VE at 6500 rpm at WOT So the motor is flowing 410 CI /12 = 34.16 CF for every 2 rpm. 34.16/2 = 17.08 CF FOR 1 rpm. So at 6500 rpm, 6500x17.08=111,020 CFM!!! All fed by a device rated to flow...

In the future I will just call PTC, converters have been great.

I’m pretty sure I would have got it with 5000+ flash also. When I only wanted/can use 3500. Not sure how that would have gone. “Yeah, the 8” converter you sent, I need it tighten up 2000 rpm, you can’t do that? Well, you see right there in the spec sheet?” Not totally fair to PTC, because...

That’s what I do, distilled water and rust inhibitor. Antifreeze in the winter. Might just start draining it and leave it empty. I have block petcocks.

I just went through this. Filled out the spec sheet for two companies. Ultimate and PTC. Never heard anything from Ultimate, got one sentence response from PTC. (8”, $950 plus shipping) was the entire email. Which tells me they didn’t really read the spec sheet I sent in. I loved my 727 PTC...

What is your mechanical ability? They are not that hard to build. You get a 727 core and go through it. I have a 727 John Cope built over ten years ago and am very happy with it. Just bought one of his 904 DIY kits and am very happy with it.

Every bit helps.

Something I have been toying with, what is the greatest source of heat in the engine compartment? The headers or manifolds. 600+ degrees, isn’t it easier to just keep the heat in the exhaust stream, at least until it’s under the car. Thermal Ceramic coating inside and out the headers or manifolds.

I run VP blue or c12 at 12.2, at 34 degrees, over all the years it never has like more or less timing and I have played with it a BUNCH! I played with the idea of tuning for track conditions with total timing. (Never really paid off) I’m also sure I don’t need all the octane I’m running, but...

Longer aftermarket front shocks, plus I spaced the stud down a bit. I have not gone to taller ball joints yet. At this point the timing and topping out events seem good for me. This is a bit after peak.

Two schools of thought, control wheel movement through REALLY stiff springs or minimal spring strength and control wheel movement with the shock. MUCH easier to adjust a shock than change spring rate. I have /6 bars, no bump stops, QA-1R’s front shocks single adjustables. The real hurdle to...

Absolutely true, but sometimes you are limited in were you can pull the weight from. I’m very traction limited, but my rear seat back weighed 50 lbs, it now weighs 10. I was worried about it being directly over the axle, but no ill effects for me. Went from 1.68 60’ to 1.60 60’ after pulling...

My car is 3353 with me in it and runs 117 mph. Calculators have it at 390-400? I can’t hit the tire like a normal car, so I’m soft down low and mph a bit more the average car for the E/T

It really isn’t a power thing. It’s loading and unloading the driveline. Then rpm blows it up. The drum will spin 2 1/2 times engine rpm.

I picked up a solid 2-3 10ths going from 727 to 904. Now, I changed from a aftermarket steel driveshaft to an aluminum one. 6-7 lbs right there. Then I went low gear set and bumped my flash from 3340 to 3500 rpm. So some of the gain is in there, but a 904 built well will live for a very long...

I run a blanket, or used to. 904 now, just personal opinion, but I believe a blanket would control an explosion better. I have seen pictures of holes through a shield. Just my gut feeling.

I run cheap plugs, I drop one, I don’t use it. $2.50 a plug? I have never had good luck cleaning them.

Did drag week 2019, No issues, swapped out the alternator at Cecil County. I remember on the first day at Virginia motorsports park it rained in the morning so everyone left the track late only getting one run in. It was sunny and HOT driving on 95 through Richmond and it’s rush hour. I’m...

Most of the time this car foot brakes, it REALLY drags the bumper when he uses the brake.

Mine are MSD sourced and data logged.

I don’t know, 4:10 here, but the low gear set also changes 2nd gear slightly. So the 2-3 split gets a bit bigger. Not an issue for me, but you can hear it. Now add a 2.94 rear ratio and you might really notice it on partial throttle shifts.

I really like the low gear set in my 904. I’m so traction limited that I can’t take advantage of a bunch of flash rpm, but because the car moves easier it gets to the power band sooner. Which helped and the fact that the car was moving helped.

Plus, the car is moving. My low gear set 904 lowers the flash rpm by its strict definition. Flash rpm is the highest rpm the motor obtains BEFORE the car starts to move. Because it moves easier, it lowers the flash rpm. It doesn’t matter to me, because isn’t one of the reasons to tailor flash...

Yes, I bumped it up from 3340 with the 727 to 3500 with the 904. I could probably go 200-300 more, but increase power is in the distant future.

My motor makes peak torque at 4800 rpm. So after the shift it starts to recover and gain rpm back at 4900. It flashes 3500.

Right before the shift the converter should have minimal slip %. With some exceptions. Here are my slip % after the 2-3 shift. My converter flashes to 3500.

I think you are correct, I don’t think the 340 would like the weight. Bone stock my car weighed 3700, but it had a/c then also.

Even at moderate to serious level effort in FAST, the “340” 420 CI A body (10.48) NOT 3600 lbs is quicker than the “383” 499 CI B body(11.0)at 3600 lbs It is just HARD to overcome the weight. The B body will close that up a bit, but the A isn’t sitting still. Take the 499 CI “383” and put it in...

My bone stock 340-s fastback auto, 3:23 open diff ran 14.97 at 97 mph. I had to walk it out pretty good to get it to stick. I was a kid, there was probably 14.6 in it. Weight hurt the 383 then and still does.

I run Pypes race pro’s through a full 2.5” exhaust with 340 manifolds and run 11.39 at 117 mph. If you go Pypes, avoid the Violators. They sound HORRIBLE. Drove 1000 miles on Dragweek with the race pro’s. It was fine.