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#1
12-11-2014, 04:49 PM
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OF cam. OK for a 400?
I'm going to pull the hyd roller I have in the car and was thinking about what I wanted to put back in. Everybody raves about the OF cam in the bigger motors but I was wondering what it would be like in a 406? Eheads, Doug's, 4sp, 2.5 exh w/x pipe.
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Robert 69 Firebird-462/Edel round ports/currently running the Holley Sniper/4sp/3.23posi/Deluxe Int/pwr st/vintage air/4wl disc( a work in progress-always ) http://youtu.be/eaWBd3M9MN4 |
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#2
12-11-2014, 08:11 PM
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Old Faithful
It would have a pretty radical idle and would need some fairly steep gearing. It's all in how much roughness your personal taste will accept. I've built several 455 engines with that cam and the power band is relatively high. With a 400 it would pull to well over 6200 - 6600.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#3
12-11-2014, 10:32 PM
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What CC eheads?
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 frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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#4
12-11-2014, 10:41 PM
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I wouldn't say in a 455 the powerband is high...it produces a lot of torque ...my engine likes a 5500 rpm shift point..doesn't run much slower at a 5000 rpm shift because the torque does the work.
With a 400 you would want to run as much compression as you could on available pump gas,have the heads setup to match the cam lift either with 1.5 rockers or 1.65 rockers,good exhaust,good fuel supply and carb and intake.It would be 475 to 500 hp properly setup and be quite the ride with a stick car!Your 3.23 gears would have to be swapped out to make it really work well. |
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#5
12-11-2014, 11:41 PM
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The heads are 75cc and right now I only have about 10.2 CR but I'm working on bumping it up some more. I can deal with a rough idle as long as I don't have to idle it up too high to keep it running.
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Robert 69 Firebird-462/Edel round ports/currently running the Holley Sniper/4sp/3.23posi/Deluxe Int/pwr st/vintage air/4wl disc( a work in progress-always ) http://youtu.be/eaWBd3M9MN4 |
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#6
12-12-2014, 07:25 AM
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That cam doesn't produce a lot of vacuum in a 455 build at 10 to 1 compression, it would idle much worse in a 400 build. The smaller Stumpuller would be a better choice for the 400 build at that compression ratio....IMHO.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#7
12-12-2014, 12:45 PM
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I agree with Cliff,my 455 was good for one good stop with my power brakes.Needed time time to build back up.Tom
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#8
12-12-2014, 12:59 PM
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With the eheads I dont see why it wouldnt be capable of 550hp with ti retainers if you were willing to spin it up and tollerate the manners. May even hook better. I agree it would need more gear and convertor compared to the 455 counter part. And hydroboost the powers brakes.
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs  ([_|_] ##\|/##[_|_]) |
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#9
12-12-2014, 02:36 PM
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I remember a video on youtube with an OF in a 400 GTO- sounded good, but I would have to agree that you would probably need some pretty stiff gearing to make it work well. The 4-speed will help-and hurt. It will help with regard to acceleration stall (U-choose-it stall. i.e "riding" or "side-stepping the clutch"), but will hurt with regard to low-rpm, 4th gear "slow-cruising". The SP seems to be a better choice- JMHO. You could have the OF ground on a 114 LSA, which I have in mine. I am getting 16-17 in. Hg at idle in gear (very little- if any- rpm drop when I put in gear at 1000 rpm- 2004R trans, 2200 rpm converter) on my 461 at 10.3:1 (round-port E-heads, pump fuel). My engine pulls hardest between 5500 and 6000 (hits rev limit at 6000). The engine sounds great (IMPO) with its lope, but it is as docile on the street as my mini-vans (Dodge, yes I am comfortable enough in my "man-ness" to say I own one -I actually have two- yikes). I can putt around at 1500 in overdrive (I think that is the lowest rpm it will "lock in" in OD) with not a hint of chuggle. That might not be the case with a 4-speed-equipped, OF-cammed 400.
Last edited by tpssonic; 12-12-2014 at 02:43 PM. |
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#10
12-12-2014, 07:02 PM
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Quote:
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1969 GTO 4spd. Antique Gold/black, gold int. 1969 GTO RAIII 4spd. Verdoro Green/black, black int. 1969 GTO 4spd. Crystal Turquoise, black int. 1970 GTO 4spd VOE Pepper Green, green int. 1967 LeMans 428 Auto. Blue, black int. |
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#11
12-12-2014, 08:01 PM
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Quote:
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#12
12-12-2014, 08:45 PM
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X3 on the power brakes- no issues ever...and I tried (on a 461 stroker).
Last edited by tpssonic; 12-12-2014 at 09:12 PM. |
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#13
12-13-2014, 02:41 AM
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Quote:
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 -1967 GTO HO Restomod. PKMM 433ci, SilverSport T56 Magnum 6spd, Moser 9", SC&C and a bunch of other pro touring goodies - Build Thread http://forums.maxperformanceinc.com/...615847&page=23 |
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