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Old 04-15-2010, 08:48 PM
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454 big block

I have a 7.4L or 454 big block the casting number is 10114182 heads are 10114156 My question is what is the max lift i can go with the stock valve springs?

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Old 04-15-2010, 10:28 PM
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Peanut port heads. Do not make horsepower. I would not go over .480 lift.
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Old 04-15-2010, 10:55 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com
Peanut port heads. Do not make horsepower. I would not go over .480 lift.
What kind of gm heads should i look for? I dont want to go aftermarket looking for a nice set of heads that will give me nice numbers but at the same time wont cost me a arm and a leg.

Would these heads be worth anything if i was to port,polish,install bigger valves?
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Old 04-16-2010, 12:55 AM
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You'll just spend a ton of money and still have production heads. Here is a good set of fairly priced heads, valve lift good to 0.750", so you can run a really hefty solid roller cam. Don't even think about running a flat tappet cam in a BBC.
http://www.summitracing.com/parts/RHS-11301-03/
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Old 04-16-2010, 01:38 AM
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To install a cam with more than stock lift you will need to change the valve springs. The stock BBC springs are very lift limited.
retainer to seal/guide boss clearance needs to be checked and verified also.
Measure your stuff before you buy a cam.
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Old 04-16-2010, 06:54 AM
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Quote:
Originally Posted by goldenbullet44
What kind of gm heads should i look for? I dont want to go aftermarket looking for a nice set of heads that will give me nice numbers but at the same time wont cost me a arm and a leg.

Would these heads be worth anything if i was to port,polish,install bigger valves?
AFA porting the PP heads, w/enough hard work and bigger valves, you can make 500 HP w/them. Not worth the effort, IMHO, but it can be done.

With stock valves, you can make maybe 450 HP, possibly a little more, but the ports are sized more like a good SBC head (a set of 215's I measured were 207 cc before porting) than for a 454 CID engine, so regardless WHAT you do, they'll not make any real top end power. They can make good torque under the curve and will peak early, so they need to be cammed accordingly.


PP VS. STD. OVAL PORTS (bottom head is upside down)

For 'regular' oval port OEM BBC open chamber heads, heads like the 781, 049 are often used, w/the stock 2.06"/1.77" valves replaced w/2.19"/1.88" valves, along w/a 3-angle valve job. They run in the mid-250 cc range on the intake port volume.

These castings are common and don't cost too much, but will often need guides and seats and valves along w/some "pocket porting" to get the most bang for the buck from them. And might need decking, and will need springs, valves (if enlarged), possibly new studs.

Some guys (me among them) like the semi-closed chamber heads like the 063, 802, 215, 290. A bit easier to make more CR w/o needing decking or domed piston. Domed pistons aren't much of an issue even if they're needed- the "dome" is very low and doesn't hinder the flame propagation like big domes in a SBC can.

If you do some of the work yourself (like the dis- and re-assembly and porting) they can make sense, but if it all has to be farmed out, aftermarket heads quickly start to make more sense.

Good luck.
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Old 04-16-2010, 01:08 PM
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Darn well Thanks for the info how much will that big block make with just a 4bbl carb and intake? stock cam. The bbc came out of a 1992 454 ss truck if that matters.
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Old 04-16-2010, 01:39 PM
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I honestly don't know, hopefully someone else will... The stock cam was pretty mild, so I doubt it'll be a whole lot more than the factory rating of 255 HP/405 TQ unless headers are used.

A cam and headers along w/the intake can wake it up pretty good. IIRC, this 454 was a "Gen V" engine.

Last edited by cobalt327; 04-16-2010 at 01:45 PM.
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Old 04-16-2010, 05:35 PM
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http://www.summitracing.com/parts/EDL-2162/ could i use this cam set up and http://www.summitracing.com/parts/CMB-03-0201/ for the top end?
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Old 04-16-2010, 05:45 PM
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Quote:
Originally Posted by goldenbullet44
You're gonna do what you're gonna do, but I'll write this caveat one more time for you....
Don't even think about running a flat tappet cam in a BBC.

As far as the top end kit, that intake manifold is a dual-plane, low-rise model. You can pick up another 35-45 hp by using a dual-plane, high-rise model such as a Edelbrock RPM or Weiand Stealth. If you can find a kit with one of those in it, it would be a much better value.

Also, don't waste your money on shorty headers. Get some long tube quality headers and pick up another 35-45 hp over shorties.
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Old 04-16-2010, 06:05 PM
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Quote:
Originally Posted by goldenbullet44
How about lets start w/the casting numbers off the heads and block, along w/the numbers from the small pad at the passenger side front of the block, where the head and block meet. That way, you'll know for sure what exactly you're working with.

The Gen 5 engine should be set up for a hydraulic roller cam and lifters from the factory, so that should mean you can reuse the existing roller lifters, and will just need a hydraulic roller cam.

That block (if a Gen 5) will not have a place for a mechanical fuel pump, so you'll need an electric fuel pump, too.
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