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Recently we dyno tested 8-10 different TBI units from every manufacture. They were tested on single(Victor) and dual plane(Performer RPM) intake with wideband O2 and EGT in each Cylinder to monitor A/F. It was a ~450hp smallblock. A/F between cylinders were all over the map with ALL the TBI...

If you have a decent budget for swap parts, a 5.7L Hemi would be a good option. Either with a 518 4speed or 5 speed Hemi, the NAG1 (car) or 545RFE(ram). It's practically a drop-in and its modern drivability and efficiency is more challenging to duplicate with a carbed small block.

Its not just a simplistic question of Single vs Dual plane, but in the OP specific case,,a TINY dual plane vs proven Single plane and (most importantly) on a 408" with a decent cam making peak hp at 6000rpm. It's not unreasonable to think a M1 would work considerably better on a 408" in every...

I would think so too. When tuned properly, EFI "adds" more off idle and low end than you expect. Case in point: I ran this giant M1 single with multiport on a 9:1 360 Magnum in my Duster. When i installed a Comp XE274H cam [230 int./236 exh .520/.522] I was concerned it would be a dog off the...

All this back and forth over Cams, Cr, ICL, valves, port velocity, TM,,blah, blah, blah While the whole combo is choked by the stock cast iron manifolds. All the proposed "gains" of the various witches brew of "mods" simply pail in comparison to a decent set of equal length, 1-5/8" headers and...

Most all Pump gas has at least 10% Ethanol if not 15%. You should already be using Ethanol SAFE fuel system components and whenever new parts are purchased, it'd be wise to ensure they're E85 safe. My Swinger is getting modern Nylon fuel line and oem quick connects for its supply and return...

Enough overlap to bleed off cylinder pressure, richer A/F, timing, perfect quench, cool aluminum heads to suck some heat out, I don't see why higher compression and/or lower octane is not possible. Getting the balance right of all variables is the key so you don't wind up with a dog or knock...

Oh yeah. Over 10:1 is really common. The 2016 3.6 pentastar is 11.5:1 which is decent for port injection. A couple small direct injected 4cyl are over 12:1. Running an Atkinson cycle, direct injection and/or cooled egr help them run knock free on 87oct. Toyota is coming out with variable...

Yes mileage suffers but at least arounf here, E85 is a quite a bit cheaper than 87oct and a LOT cheaper than 93oct, so its either saving money or a wash. New flex fuel cars are typically over 10.1 compression(some over 12.1) and use variable valve timing in take advantage of the higher octane...

I've been selling a couple hundred E85 & Gas tune combos for 03-05 Srt-4 Turbos for about 6 years now. They're specifically designed to easily swap between E85 and Pump Gas. Just run the tank below 1/8 and as the car is filling up with the "other" fuel, flash the matching tune.

Too Right!

Your anecdotes seem right sub 20% for manuals and mid-low 20s for Autos 471BB+6speed--14% drivetrain loss. Sounds right for a MANUAL 360--22% drivetrain loss Sounds right for a Auto But the OPs supposed 34% drivetrain loss seems a bit off as long as its not an automatic 4x4. Doesn't matter if...

Its all good.

LOL,,, So a stock 340 gaining 40Hp/40Trq from headers and good intake, is just OUT OF THIS WORLD UNBELIEVABLE?? lol!! FAKE NEWS!!! lol Quick lesson on racing Dynos. Dynos can vary in their accuracy and its correction factors manipulated to get whatever # makes you feel good about your crap...

Right that's why the +40hp/+40trq gain I mentioned from the Headers and intake was AFTER they already fixed the carb issues with a new Edlebrock 800. I graphed the difference & the gains are through out the ENTIRE curve not just peak. New Stock(new 800cfm) vs 340(Carb +Headers+Intake) lol,,no...

1-5/8 Extractors and an Alloy Performer RPM added up to 40hp and 40ftlb on this stock cammed 340. HUGE Bang for the Buck and just an afternoon's work 1970 340 High Performance Mill Dyno - Mopar Muscle Magazine

Just stepping up the the factory 4bbl cam would be a fair compromise. Summit Racing SUM-K6900 is cheap and has the similar specs as the factory 73-74 4bbl cam: Advertised Duration 278/288, Lift .421/.444. Summit Racing® Classic Cam and Lifter Kits SUM-K6900

Instead of fussing with idle, I always adjusted the kickdown linkage with the carb and throttle lever on the trans at "WOT" to ensure the trans had full line pressure during WOT shifts. I've just seen too many misadjusted kickdowns burn up transmissions. Just hold the carb WOT and the trans...

Stall speed of a REAL stock TC is ~2400rpm, so if that's what you have, I don't see that being much of an issue. I agree with most of the guys here that cam has a long proven history and should be running better than you're letting on.

tbd

You guys really get lost in the weeds,,,,,the root cause of unrealistic Hp variation seems self evident. Doesn't anyone else think the low rpm Hp results was wildly corrupted and simply a result of poorly controlled throttle between pulls?? Thinking that the EXACT same part throttle opening...