[nvrstuk]

Question is I have this Comp Cam: Camshaft Lobe Separation 110°, Duration 242°/248° @ .050" lift (int./ex.), Lift .594/.618” (int./ex.). Only spin it to 5900rpm.

This is in a 460sb. It idles extremely rough. I can't lock the converter till 1800rpm or my Bronco is bucking as I'm going down the road.

I run a Moates Qtrhorse, EDIS and Decipha has it dialed in well. Idles great at 750rpm even with 6.3" of vacuum.

Would a cam designed specifically for EFI gain enough HP & torque to really notice? It's a radical arse cam, sounds great, ton of attention but I really want more power out of it if it's available and I would think that a 114 or LSA in that area would help the EFI get the signal it needs for idle. I

 

[Ed Curtis]

More importantly...

What heads and intake is this 460 using?

 

[rob]

It idles extremely rough and then idles great at 750?

Rough idle and bucking on efi, usually tune.

I have had similar sized cams in 363 which idles and ran pretty good but with aftermarket efi and manual trans. My wagon with a 363, carb, auto and similar sized cam runs pretty close to perfect. My bird with 363, auto and even larger solid roller cam has no driveability issues.

 

[96pushrod]

That really doesn’t look like that much cam for a 460.

 

[nvrstuk]

Idling great with that cam means it idles and throttle response is good right off idle. Hard to do with 6.,5" vaccum and efi.

Fords Z alum hi port heads. Only 205cc heads, SuperVIc intake.

Key for me is driveability at low rpms. This is in a '68 Bronco, 40"s, 5.13 gears, 6r80 (I made the adapter), ARB's front rear. I rock crawl, sand drag (no stall in Converter but its fun) so it has to be able to operate below 1800rpm for literally a half day at a time crawling in 90+ degree heat. So, looking for the best of all worlds. Plus from March till Nov I average 180-200/miles week as a DD in my small community. So, driveability is important, low rpm use is extremely important, moving 5350# on 40"s is important.
Thanks for any help.

 

[ndmp40]

You have the wrong cam.

 

[mhinchley]

A custom cam is not much more than a shelf cam. Get a cam made for your setup. That will be best for your worlds & probably the only way.

 

[robvas]

What's different between an EFI cam and a carb cam?

 

[rob]

Idling great with that cam means it idles and throttle response is good right off idle. Hard to do with 6.,5" vaccum and efi.

Fords Z alum hi port heads. Only 205cc heads, SuperVIc intake.

Key for me is driveability at low rpms. This is in a '68 Bronco, 40"s, 5.13 gears, 6r80 (I made the adapter), ARB's front rear. I rock crawl, sand drag (no stall in Converter but its fun) so it has to be able to operate below 1800rpm for literally a half day at a time crawling in 90+ degree heat. So, looking for the best of all worlds. Plus from March till Nov I average 180-200/miles week as a DD in my small community. So, driveability is important, low rpm use is extremely important, moving 5350# on 40"s is important.
Thanks for any help.

Who did your cam? Did they recommend the super victor?

sounds like it will be a badass bronco when you get it squared away.

 

[Ed Curtis]

What's different between an EFI cam and a carb cam?

Nothing -

 

[Sprayn383]

Fill out a cam build sheet at Flowtech Induction, I've bought several cam packages from Ed and he nailed it every time.
Combos were
My personal 434 with a F2 Procharger
Friends BB Mopar- picked up 3 tenths in the 1/4
408 n/a for a truck
347 small Vortech
347 n/a in a Falcon wagon
408 n/a in a bracket car

 

[Ed Curtis]

Fill out a cam build sheet at Flowtech Induction, I've bought several cam packages from Ed and he nailed it every time.
Combos were
My personal 434 with a F2 Procharger
Friends BB Mopar- picked up 3 tenths in the 1/4
408 n/a for a truck
347 small Vortech
347 n/a in a Falcon wagon
408 n/a in a bracket car

Brian filled out a Cam Tech form about three years ago with a completely different combination for the Bronco but I have nothing on this one... "yet"...

 

[nvrstuk]

Nothing -

First my disclaimer- I don't build cams!

Now I was told/read that engines designed for EFI would use cams with higher LSA numbers to help the ECU and everything (simplified answer) involved with signals for triggering it correctly and that engines with carbs could run at much lower LSA numbers and not be affected as much.

I am NOT a cam builder.

I filled out Ed's spec sheet- just last week. I'm on vacation awaiting an improperly machined block to be returned to me from Ford Performance & while I'm away thought I'd ask here about cams rather than bother Ed (again) while I'm waiting.

He built a cam for another 418 stroker I built years ago. Exactly what I asked for. Not doubting Ed, just wanted an answer and I got it.

I just want ed to know if I will leave any power on the table (got over 13,000 miles on this 460 already) by going to a different cam. What I need to do is trust Ed again and give him the OK. I would if I had my block back from Ford. There is a slight chance I might get a short block from them for the warranty but I doubt it so I'm not ordering the cam till I get the notice that at the least, my block is on it's way back- this has been a 7 month long ordeal.

I missed an event 2 weeks ago and have another event in Utah in 4 weeks.

Bit long but lot's going on.

 

[nvrstuk]

Asked because I called every aftermarket EFI manufacturer & they won't guarantee their systembeing able to work with 6.5 in of vacuum. They all said they need more vacuum, 8.5min. What they told me. Hence my question as they all said I needed a cam designed for EFI (like more LSA). So,

Back to a different cam choice. I'm dyno'd at 601hp at 5500 rpm now. Not interested in spinning this stroker more than 6k so is there more HP/torque available with this setup w/o a blower and a redesigned cam? Driveability and dependability is extremely important over a potential 20 HP ?? gain that I probably wouldn't ever notice since I'm never (except 2x/year on sand) ever clocking it and never go above 80mph.

Ed- I did fill out a cam build sheet request but I couldn't put it in Word Format so i sent it the way it appears on your site.

I'll try to somehow get the form into Word and get it to you within the hour.

 

[stangjumper]

Asked because I called every aftermarket EFI manufacturer & they won't guarantee their systembeing able to work with 6.5 in of vacuum. They all said they need more vacuum, 8.5min. What they told me. Hence my question as they all said I needed a cam designed for EFI (like more LSA). So,

Back to a different cam choice. I'm dyno'd at 601hp at 5500 rpm now. Not interested in spinning this stroker more than 6k so is there more HP/torque available with this setup w/o a blower and a redesigned cam? Driveability and dependability is extremely important over a potential 20 HP ?? gain that I probably wouldn't ever notice since I'm never (except 2x/year on sand) ever clocking it and never go above 80mph.

Ed- I did fill out a cam build sheet request but I couldn't put it in Word Format so i sent it the way it appears on your site.

I'll try to somehow get the form into Word and get it to you within the hour.

Efi doesn't care what vac is at idle.

What happens to all the systems when you press the gas pedal down to where the engine is pulling less than 6.5"? 4.5? 0? And do I even have to ask about positive pressure/boost?

 

[96pushrod]

What's different between an EFI cam and a carb cam?

Mainly that one will have a carburetor providing fuel, the other fuel injectors.

 

[nvrstuk]

Ed's got the spec sheet I sent him in Feb so he's building a cam for an engine that doesn't care if it's efi or carb.

 

[Ed Curtis]

Ed's got the spec sheet I sent him in Feb so he's building a cam for an engine that doesn't care if it's efi or carb.

Ready when you are. 😎