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Old 03-26-2012, 04:08 PM
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454 motorhome engine late model

my motor came out of late model motorhome has gen 5 block flat tappet cam and gen 6 peanut port heads makes tons of torque on low end but will not rev past 5000 rpms and stops making power at about 4300 rpms id like to find a low budget cam replacement to get more rpms from this motor its converted to carb with weiend manifold for truck motor can i achieve this and still use stock valvetrain ? any help would be appreciated motor is in 73 ventura 400 turbo trans 3000 stall stock rearend gear
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Old 03-26-2012, 04:26 PM
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welcome...I am thinking you need better heads
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Old 03-26-2012, 04:44 PM
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Lunati Cam

Hello:
Believe it or not, I am putting a new motor into my RV. I know that you pulled this motor out of an rv and installed it into a Nova? Am I correct on this?
Either-way, if you want a really sweet cam to run in it with GOBS of neck breaking torque, then here is the best answer I think!

It is the Lunati Voodoo cam~! I am using this in my build, but mine is a Small Block Chevy.

Hydraulic, noticeable idle. Best mild performance cam. Works excellent in fuel injection applications. Makes approximately 19 inches vacuum at idle. Great for performance oriented marine applications and heavy duty 454 Dually towing applications. Perfect street rod cam.

Advertised Duration (Int/Exh): 256/262
Duration @ .050 (Int/Exh): 213/219
Gross Valve Lift (Int/Exh): .515/.530
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1000-5500
Includes: Cam Kit

Part Number: 60201LK

Jobber Price: $206.24

Top your motor with the Airgap intake and a 700CFM holley, and you will not believe how powerful it will be. Check my latest article about adding a Fuel /air mixture anlog meter with the Percy's adjust a jet kit to a Holley carb and your in like FLYNN~!

Here is the article to look for:
Innovate 3822 G5 Wideband Air Fuel Gauge Lc-1 Kit

P.S. I am using the Pro-Comp intake Airgap and they work just fine...Here is an article from Chevy High Perfomance mag on a 305 sbc build using various pro-comp parts.

http://webcache.googleusercontent.co...&gl=us&strip=1

Last edited by Dannyringo; 03-26-2012 at 04:50 PM.
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Old 03-26-2012, 05:49 PM
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these heads make tons of torque and great throttle responce just wont rev i dont want to convert over to adjustable rockers so i need something under 500 lift its a show street car raced very rarely so i dont need anything to wild
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Old 04-07-2012, 06:31 PM
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Quote:
Originally Posted by poncho62
welcome...I am thinking you need better heads
x2

Even just some cast-iron 781 or 049's would be much better.
Those big-block Chevies gotta breathe to get the RPM's.

You'll probably want a carb in the 800+ CFM range if you're looking to get into the realm of 6,000 RPM.
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Old 04-16-2012, 08:31 AM
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ive got one of them rv 454's for my 63 nova wagon. this is interestin to me. i ben thinkin bout just leavin it as is. plenty power.
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Old 05-09-2012, 11:41 PM
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They tell me if you port those heads they work great. I read an article last week done by car craft or someone. They did a budget build and got 600 hp with those heads on a truck motor. I will look for the link. It was on high performance Pontiac forum.
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Old 05-10-2012, 02:29 PM
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One test Car Craft did was on a crate BBC 4-bolt 454 + 0.030" (461 ci), peanut port heads (118cc chambers = 9.4:1 CR, stock valve sizes) w/a XE 268H Comp cam (.515"/.520" lift, 224/230 @0.050" duration on a 110 LSA), w/a Holley HP 750 carb and a (too-large) set of 2.25" dyno headers.

It made 446 HP @ 4900 RPM/542 TQ @ 3600 RPM. It made 490 ft/lbs @ 2500 RPM. There's no doubt the numbers would've been better w/a smaller primary header diameter, IMO.

Made a lot more (like about +120hp) w/Dr. J's Profiler aluminum heads in a subsequent test.

More: http://www.carcraft.com/techarticles...d/viewall.html and http://www.carcraft.com/techarticles...e/viewall.html
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Old 05-25-2012, 02:51 AM
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I bought similar 454 from past owner. He said he pulled 454 from motorhome and rebuilt with mildly modified and blueprint. I put it in my 63 impala and it haul ***! But I never needed push it to 5000 rpm. Penalty power that I'm satisfied with on 4,500 lbs impala until valve stem sealers broken that oils are filling my crossover. Since I seriously thinking about rebuild heads by porting those peanuts ovals and maybe enlargement valves. .
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