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  #1  
Old Apr 17th, 13, 6:19 PM
RoyaltyRides RoyaltyRides is offline
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Default 402 bbc 500 hp?

I have a 1970 402 bbc. Checked my casting numbers and it makes 325/335hp. I've heard its hard to make huge hp from a 402. Hopefully can tell me the range I'm in. Here is what the motor has:

10.5:1 CR
Lunati 60204 cam and lifter kit .554/.572
Aluminum oval port heads 2.25 int/1.85 exh
Edelbrock Air Gap Intake
Holley 750 Double Pumper
2800 stall with 3:73 gears out back.

Thanks
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  #2  
Old Apr 17th, 13, 6:25 PM
kev574 kev574 is offline
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Default Re: 402 bbc 500 hp?

I'd say around 450 horse.
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  #3  
Old Apr 17th, 13, 7:38 PM
kettbo kettbo is offline
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Default Re: 402 bbc 500 hp?

could you be VERY SPECIFIC on the heads?
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  #4  
Old Apr 17th, 13, 9:04 PM
RoyaltyRides RoyaltyRides is offline
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Default Re: 402 bbc 500 hp?

Prostar heads machined to match my cam specs

300cc intake runners
115cc combustion chambers
valve springs are .600
7/16 rocker studs
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  #5  
Old Apr 17th, 13, 9:09 PM
pauls72 pauls72 is online now
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Default Re: 402 bbc 500 hp?

Wtf are prostars
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72 chevelle
496ci bbc
Rpm air-gap
Trick Flow 280 power ovals
850 dp
Straub hyd roller 238/246 .643-.620 107
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  #6  
Old Apr 17th, 13, 9:30 PM
RoyaltyRides RoyaltyRides is offline
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Default Re: 402 bbc 500 hp?

typo I was tryna multi-task.. they are pro comp heads
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  #7  
Old Apr 17th, 13, 11:12 PM
VORTECPRO VORTECPRO is offline
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Default Re: 402 bbc 500 hp?

Mike Lewis' 408 made I believe 540 HP.
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  #8  
Old Apr 18th, 13, 8:05 AM
bracketchev1221 bracketchev1221 is offline
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Default Re: 402 bbc 500 hp?

I made 501 with 781 casting steel heads, and a Lunati 40209 solid flat tappet cam. 10.5.1 compression, airgap intake and 800 holley.
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  #9  
Old Apr 18th, 13, 9:46 AM
putput putput is offline
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Default Re: 402 bbc 500 hp?

I made 490hp, 450tq with 10.5-1, oe 215 heads with some port work and a comp 294 mech cam.
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  #10  
Old Apr 18th, 13, 2:42 PM
RoyaltyRides RoyaltyRides is offline
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Default Re: 402 bbc 500 hp?

If I'm in the 450-500 range I'm totally okay with that. I know the only true way is to dyno. I just wanted to make sure I was on the right track. This is my first big block build
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  #11  
Old Apr 18th, 13, 2:51 PM
kev574 kev574 is offline
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Default Re: 402 bbc 500 hp?

I'd say your in that range, have you drove it yet?
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  #12  
Old Apr 18th, 13, 4:41 PM
RoyaltyRides RoyaltyRides is offline
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Default Re: 402 bbc 500 hp?

Drove it before with the cast iron heads and a 650, but swapping the aluminum heads on with the 750 this weekend. It has hooker comp headers and super 44 flow masters
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  #13  
Old Apr 18th, 13, 4:44 PM
badrad badrad is online now
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Default Re: 402 bbc 500 hp?

I personally wouldn't use the Procomps or heads with a 2.25" valve in that bore due to shrouding. A decent set of factory closed chamber ovals will do wonders for the 396/402 based engines.
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  #14  
Old Apr 18th, 13, 5:09 PM
pauls72 pauls72 is online now
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Default Re: 402 bbc 500 hp?

Ya I don't like those heads either
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72 chevelle
496ci bbc
Rpm air-gap
Trick Flow 280 power ovals
850 dp
Straub hyd roller 238/246 .643-.620 107
10.7 cr
Th350
9" 3:73
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  #15  
Old Apr 18th, 13, 5:24 PM
RoyaltyRides RoyaltyRides is offline
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Default Re: 402 bbc 500 hp?

It came with the the factory ovals. I'm not a fan of cast iron heads. All the extra weight but can you give me a little more explanation about the shrouding with 2.25s
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