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Old 09-25-2002, 12:43 AM
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Post Powerpack Heads

Anyone know what Horsepower figures 283 Powerpack heads flow? What valve sizes are they?
Any ideas on what cam specs are needed for 300 Horsepower in a 283 - Duration at (0.050),& Lift.
Any other 283 Chev Info and ideas would be greatly appreciated.

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Old 09-25-2002, 04:16 AM
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Powerpacks are not known for their breathing abilities, but they should give great low end velocity. The valves were 1.72" intake and 1.5" exhausts. I have seen them opened up to 1.94" intakes. I believe they have 58 to 60cc chambers.
The factory advertised a 283hp engine, but that was gross hp. I saw somewhere that the advertised 270hp engine actually only made 190hp.
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Old 09-25-2002, 06:54 AM
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The "power pak" heads, as they are called, have approx 138 CC intake runners, and they don't flow much air. However, due to the small cubic inch engine they are on, they perform admirably. 300 Horsepower is not out of reach for this little motor. Pocket port the heads, and have a good quality valve job laid on them, use a mild hydraulic cam, maybe a comp 268H hydraulic cam (268 deg adv duration intake and exhaust, .218 deg at .050, 110 deg sep angle, and .458 lift. Use 1-1/2 tube headers, and an edelbrock performer intake with a small 500-600 CFM carb, Vac secondary Holley or Carter/Edelbrock AFB style. Actually the 270 horse 283 with 2 WCFBs, Duntov 097 cam and 10.5 compression did achieve 270 horsepower, and would propel a properly prepped Corvette to low 13s and high 12s if set up right. These small engines like manual transmissions and low axle ratios, as they make more power upstairs.
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Old 09-25-2002, 08:30 AM
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i always thought powerpak heads had 1.94 intakes. that camel humps were the same as fuelies at 2.02. yea or nea.

[ September 25, 2002: Message edited by: bullheimer ]</p>
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Old 09-25-2002, 10:04 AM
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The term power-pak comes from the early 265 and 283 in the 55-57 chevs. These engines were four-barrell equipped with dual exhaust, and were called 265 or 283 power-pak. I'm not really old enough to know it there was any difference in the various cylinder heads used on these engines, but I'm pretty sure all 265 and 283's had 1.72 inch intakes along with 1.50 inch exhausts. I believe the term power pack heads is kind of a generic term for 283 cylinder heads in general. I do know there is one 283 head that has combustion chamber shape of the 186, 291 and 462 head, but I can't remember the casting number.
The term "fuelie" was used for the early 461 and 461x head, because it was first used on the fuel injected 327 Corvette engine, thus people began to call all old double hump heads "fuelies"
Most double hump heads produced came with 1.94 intakes with 1.50 inch exhausts. The high performance engines, IE the 302,ect had the 2.02 and 1.60 inch sized valves, but I'm not sure if the early engines like the 327-375, 327-345,327-350 had the 2.02 intakes, and 1.60 exhausts from the factory.
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Old 09-25-2002, 07:54 PM
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The L-79 327/350hp had 2.02/1.60 fuelies.
As far as I knew all 283 powerpack heads were 1.72/1.50.Wasen't the casting shape just a little box(about were double humps are) with a point on it???
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Old 03-25-2009, 09:45 PM
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283 on a 350

i have a 70 c 20 that i bought as it is now with a 350 with the power pack 283 heads with the rectangular casting with a triangle on top. my truck is a camper 20 and i was told that it was all stock, can that be possible with theese heads and does anyone know what i can expect from this set up
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Old 03-25-2009, 09:55 PM
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Those heads wouldn't be stock on your C-20, someone must have swapped them there. You might want to check the block casting #'s to see if it even is a 350, it is not unusual to find a mishmash of parts on these old farm trucks after 35+ years of hard use.
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Old 03-25-2009, 09:55 PM
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Look HERE for SBC head casting identifiers.
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Old 03-29-2009, 10:44 AM
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block castings

thankyou for your reply, after thinking about your response it dawned on me that I just took the farmers word for it that it was a 350. he told me it was all original but the title work shows he hassent owned it its whole life so I suspect it is the way he got it. I know it came with a 350 originally. I got the casting numbers off of the block it is 3970010 I find that this can be a 350 or 327 how can I find out which it is?
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Old 03-29-2009, 04:48 PM
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You would have to pull a valve cover to get the head casting #. The qriginal application code for the block is stamped onto a flat pad just in front of the pass side head where it bolts to the block.
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Old 03-29-2009, 07:21 PM
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heads 882s

882s heads are 58TO 68 cc 202 intake 162 out good heads but if you use flat top pistons it well not like pump gas but if you use stock unleaded gas pistons it will run great in sbc to get 300 hp out of a 283 you have to bore it to a 301 right cam carb it will turn 7000 rpm and but out 325hp i have built several of them in by time
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Old 11-03-2009, 12:30 PM
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Quote:
Originally Posted by bowtie741
Anyone know what Horsepower figures 283 Powerpack heads flow? What valve sizes are they?
Any ideas on what cam specs are needed for 300 Horsepower in a 283 - Duration at (0.050),& Lift.
Any other 283 Chev Info and ideas would be greatly appreciated.
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Old 11-03-2009, 12:33 PM
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hey i have a 327 with power pack heads on it and i would appreciate any help with if it would have a lot more compression cuz i dont know that much about motors i know more about body panels and stuff so plz help
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Old 11-03-2009, 12:50 PM
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Quote:
Originally Posted by auston_hotrod
hey i have a 327 with power pack heads on it and i would appreciate any help with if it would have a lot more compression cuz i dont know that much about motors i know more about body panels and stuff so plz help
Not quite sure of the question. But the PP heads have very small ports and will have a higher CR if using FT pistons in a 327 SBC than pump gas usually will support, w/o retarding the timing and etc. to keep it out of detonation. Never mind that they're pushing 50 years old and really weren't all that, even back then.

The most CR that a 327 will tolerate on pump gas is dependant on several things, but it will be with a modern combustion chamber design in an aluminum head.

Next to that is the Vortec and similar type aftermarket iron heads, which I happen to prefer. IMHO, the extra CR that the aluminum heads allows is a bit deceiving- they only allow the additional CR because they lose more heat. Heat is energy, so in the end, it's a wash.
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