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Old 07-20-2013, 08:38 PM
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rebuilding my 427

I am rebuilding my 427 BBC that I use for mudd boggs. right now I have a 3.75 stroke crank. with 6.135 rods. its bored .60 over. I have closed chambered heads on it that are cast iron. right now it turns 7000 rpm's. I am wanting to build the motor to turn 8000 rpm's. I was wondering what I would gain by going to longer rods. and also going to open chambered heads? Would I be Better going to aluminum rods? I am currently using a comp cam. are there any better? I am on a budget of approx. 5000. I am going to reuse the crank dampner and carb. looking to upgrade everything else. any help would be greatly appreciated.....

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Old 07-20-2013, 09:14 PM
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your parts list is vague.what are the cam specs of the cam you have? is it a roller or solid flat tappet?what intake? how many horses are you looking for? 5k doesnt allow for much in improvements. good heads will cost 2500 plus and pistons perhaps,machine work? over haul kit?
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Old 07-20-2013, 10:39 PM
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you claim 550 HP and 550 torque and 7,000 RPM. Something does not add up? I can see what looks like a 950 Hp Holley and jeep race headers,and a single plane intake.
You need to participate here if you want help.
where did you get the power figures? why is the HP low(ish)?
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Old 07-21-2013, 07:51 AM
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With what is listed. I'm thinking more like 450 HP area. Who know with parts list.
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Old 07-22-2013, 01:01 PM
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Sorry I have been working overtime. I am going to go with a roller cam. I was looking a Brodix heads. I looked at the brodix website and it has a top end for 2500.00. But that doesn't include the cam.
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Old 07-22-2013, 01:11 PM
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The cam I am using now is a solid flat tappet cam with a lift of 624 624. The Carb is a 1050 dominator that was built By Ken Jones and very reputable carb guy in the area. I got the numbers from someone who put all my info into a desk top Dyno about 7-8 years ago. I am currently running a Victor Junior intake. I would like to get 600-650 horses plus as much torque as I can out of it. I know 5k isn't much. That is why I am going to do as much of the work as I can. except for the machine work? The block I am using has been bored 60 over. depending how how it looks I might go 90 over. I am looking at either eagle or scat aluminum rods. I am looking at JE pistons. either a custom comp roller cam or a voo doo cam that is good up to 8000 rpm's

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Old 07-22-2013, 07:14 PM
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dont use aluminum rods.find out if the Brodix heads flow over 400 CFM,I figured Dart/AFR 335 cc heads as a good choice.The manifold and carb you have are fine.You will likely have 11.5-12:1 CR for a race engine. Rocker shafts. I see no reason not to have 700+ HP.
The old guesstimate I believe to be incorrect...If the hp and torque were the same number,it would be at or near 5200 rpm
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Old 07-23-2013, 04:56 PM
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ok thanks. I appreciate it. what will I gain if I go to a longer rod?? and I will check to see what the brodix heads flow
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Old 07-23-2013, 05:22 PM
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dont worry about rod length unless you need new rods. A 427 is a short stroke engine,not likely a lot of gain with longer rods.You are still not talking about huge power
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Old 07-23-2013, 10:37 PM
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ok. I am going to be getting new rods. the ones I have are eagle I beam. They are only rated to 7000 rpm's. I am wanting to go up to 8000. I am looking at H beam rods
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Old 07-23-2013, 10:39 PM
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buy a set of Carrillo rods
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Old 07-25-2013, 04:25 PM
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ok will do thanks
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