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Rims are actually 1 inch wider than their nominal width lip to lip. I like to use wheels the same actual width as the nominal width of the tyre. Add one inch to the rims you are considering and convert to mm then go for the closest match. Eg 245 works good on an 8.5 inch rim, 285 on 10. Given...

Sounds like the main circuit is not coming in early enough. Had the same problem. My fix involved a combination of richer than ideal idle jets, richer E-tubes, and (this made the biggest difference) my float levels were set-too low, raising them and getting them all even made a huge difference...

I'm with Jac Mac. I have done a true back to back comparo on a 383SBC with no other changes - this was a mild 400-ish hp street engine with 170cc intake runner and edelbrock heads, hyd roller cam, 9.5 c.r. Proform (Holley HP clone) 750DP carb on edlelbrock performer intake vs quad 47mm OER...

Hi Steve - I get you now! 1/2 a turn out from seated is not unusual on a 4 corner idle carb. Once you get lean best idle, then work on the IFR size and throttle plate position w.r.t. transition slot to cure the flat spot. It sounds to me like your IFRs might actually be too small, or you...

Hi Steve, sounds like you've tried everything, but if the car still runs with idle screws all the way in then you have a circuit operating at idle that shouldn't be. This is not likely to be a metering block issue. The QF blocks are great to properly tune the carb, but I think it might be...

Steve, I used the QF metering blocks on a 950DP that i was blowing through on a turbocharged 461BBC and they are a good thing. I have however also used fuse wire fed into the non-adjustable IFRs to lean down off-idle and light cruise mixture, so if that's the only issue there's a cheap way to...

Hi Tom, A properly tuned 750 should work great on a performance 331. If o/all mixture is good on a steady pull, it's probably a secondary pump shot issue. I often used a small pump cam on the primaries and a pink pump cam on the back, and you may need to play with pump shot duration by...

Sorry for the thread drift, but a question for Jac Mac: I treated my chambered mufflers as the "end" of my system due to their reasonably large volume, and put a tuned secondary length (based on the pipemax program) into the system before the mufflers, based on stuff I'd read by Vizard. What's...

[/LEFT] Hi, in my opinion an engine like yours that breathes well probably needs 2 1/4 inches of throttle plate per port in an IR application - and nothing dangling in the airstream - that pretty much rules out IDAs, and I think puts you squarely in the domain of an IR EFI set-up if you want 8...

Hi Leon, awesome progress - those wheels are going to be wicked. On your front end - I offer a couple of thoughts: the expedient approach of using the same axis to mount top inner link and top of shock creates a reducing rate suspension, where spring rate steadily reduces under bump - the...

I can add a mild street example to Mike's excellent summary above. I used the moon clone manifold pictured above with 4 x 47mm OER (DCOE clones) on a 383 with 9.5 c.r., and a 218/224 hyd roller with 110 lobe centre, and some 170cc edelbrock heads. Once I had completed the massive effort of...

Hi, is float level right on all carbs? - I has hideous transition issues and it turned out to be almost entirely due to float levels set significantly too low. Cheers, Andrew

Hi LLoyd, I would treat your system as having one overall volume of fuel storage, simply split over two tanks with a 1/2 inch low-level balance line that keeps them both at the same level and allows vehicle corner weights to be relatively equal. With this approach you then just need to...

I've got an 8-stack hilborn EFI set-up - hilborn leave the original mechanical fuel lines and distribution block in place in their EFI set-ups (fuel injectors are down the middle) and turn that into source of manifold vacuum for MAP sensor. Cheers, Andrew

Great that you have the oil control problem nailed! Out of curiosity why are you using alpha-N and not speed density in your EFI set-up? Using TPS for the load axis is more suited to max effort drag race engines with super radical cams running wide open and in a narrow RPM range. I would have...

Obviously nail down any issues with fuel pressure, then double check float levels. A low float level will delay the onset of the main circuit, and a higher float level can bring it in earlier - this makes a really big difference in my experience. I had an issue like this with a DCOE...

Good shit Russ! Cheers, Andrew

Hi, I agree they look cool - but according to various material published by David Vizard they neither protect the engine from the kind of fine material that knackers the rings, or flow well. Cheers, Andrew

I think the normal configuration for long narrow side pod tanks is two lift pumps (like a low pressure carter rotary vane etc), one drawing from the front, one drawing from the back, both feeding the bottom of a swirl pot (mine is 2 litres in volume) and both lift pumps protected by seperate 100...

Hi All, still in the build phase and have a 930 transaxle using Kennedy heavy duty clutch - their highest rated unit good for 600 ft/lbs evidently. Was mucking around in the weekend planning the hydraulic slave conversion and tried to stroke the clutch manually using a 2 ft bar acting directly...