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Old 04-27-2009, 07:15 PM
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help me get more power!!!!!

I am currently running a 1978 sb 350. i am running flat top pistons with four valve reliefs. and 2.02 int 1.60 ex heads off of a 400 sbc. weind stealth intake and holley 750 double pumper carb with MSD pro billet hei ignition.the cam is a lunati voodoo cam .489in .504ex duration at .050'' tappet lift 227in 233ex and advertised duration of .268in 276ex. It is in a 1978 chevy c-10 half ton 2wd pick-up weighing in at about 2800 lbs. i currently had 4.10 richmond gears put in the gm 12 bolt rear end. and am running a th-400 tranny with b&m 2400 stall converter.it runs fairly well at this point but am thinking of going with a bigger cam. what are the advantages of doing so and will my heads work with a bigger cam?

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Last edited by mattmar; 04-28-2009 at 09:30 AM.
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Old 04-27-2009, 08:31 PM
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you have a good combination, i would leave it alone. the cam matches your truck very well.
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Old 04-27-2009, 08:59 PM
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Thanks for the reply! to my post. i can get 327 camel back heads with the 2.02 valves would there be any advantages to be had there? i mean over the 400 heads i am curently using?
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Old 04-28-2009, 03:15 PM
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By using camel humps you would only be raising your compression, you might have to switch to a higher octane fuel.
What about these 400 heads, are they modified. screwed studs and beefier springs ?
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Old 04-28-2009, 03:26 PM
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Quote:
Originally Posted by mattmar
i can get 327 camel back heads with the 2.02 valves would there be any advantages to be had there?
There might be.

To you, what about your truck's performance is lacking at this point? What is it that you are trying for- more top end, quicker take-off or 1/4 mile ET? Badder-sounding idle? More MPG?

From what you answer, you can bet there will be any number of responses. Some might even help!

But as it stands now, you are kind of asking, "How long is a piece of string?", if you follow me.
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Old 04-28-2009, 03:31 PM
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they have screw in studs and aftermarket spings that support up to a .550 lift cam. the machinest also done a 3 angle valve job and they have a hardend valve seat. there was no port work done and they are a 73cc combustion chamber.
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Old 04-28-2009, 03:43 PM
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im sorry i would like to improve the mid to top end power in this motor.as it is now i am happy with the torqe it is making. but wish to add more mid to top end if possible.
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Old 04-28-2009, 07:33 PM
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I would go with a set of vortec heads. 400 heads were turds from the factory as the 400 only came with large 76cc smogger heads. Your looking at 30 horses over camel backs by going the vortec route. To weight in at 2800 pounds you must have shed alot of weight from it as in factory trim it weighted considerably more. Remember, the point of it all is the combo must match, or, work together to make max power. If you move up on cam sizes the engine needs more compression as well as other changes to meet the current ET`s you meet. If you go vortec the whole combo will change but this is what hot rodding is all about. When you change one thing, the rest of it changes as well. Vortec heads make things easier as there chamber is small at 64cc`s and far more efficient as well as are the ports. Flow is power, and no factory small block head flows better than vortec heads. So what`s been said matches to what I said, the combo must work together. When you get it working together your ET will go down considerably.
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Old 04-28-2009, 08:25 PM
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thanks for the good advice guys. i appreciate it.
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Old 04-29-2009, 10:35 AM
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but what kind of gains am i looking at if i go with the camel back heads over the 400 heads?
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Old 04-29-2009, 10:45 AM
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A WAG would be 15-25 HP, mainly from the added CR.

Depending on what the deck height is at and what the actual CR is at, you will be in premium fuel territory- or more- to stay out of detonation.

Even if you used a cam that needed the CR, you will still need to go easy on the ignition advance to survive on the street.

IMHO, I don't see enough of an improvement to justify the swap. Plus, if the fulie heads don't have accessory bolt holes on the ends of the heads, you will have to change the front engine dress to a short water pump set-up if you're running a long W/P now.

The Vortec's are better in all ways, unless you go to an aluminum after market head.
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Old 04-29-2009, 10:53 AM
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thats awsome! that was just the info i needed cobalt. thanks for taking the time to answer my post. much appreciated.
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Old 05-04-2009, 12:39 AM
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just 1 more question? do you guys think i woul benifit from 1.6 ratio rockers? on this setup.
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Old 05-04-2009, 02:00 AM
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Quote:
Originally Posted by mattmar
just 1 more question? do you guys think i woul benifit from 1.6 ratio rockers? on this setup.
I don't recommend 1.6 ratios on SBC cams such as Voodoo or Extreme Energy. The lobe ramps are about maxed out as they are. Can cause problems.
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