I didn't know this. The '62 283 has no harmonic balancer, the dude I bought it from said it never had one. Will this be cool? Will I have problems? Are the power pack heads the ones with a pyramid on them? Thanks.
Nads, the 283's i've had didn't have balancers( i didn't 'think' any did) . you could run it that way without a problem. I've ran all my 283's that way but the one with a blower. i wouldn't think you would have any problems.There's a lot of them still running that way. the only thing i did was drill the crank for a bolt like it's bigger brothers. I did have one of those crank stub's wear and come loose. After replacing it i felt it was a good move. the heads i'm drawing a blank right now. Rat..
Hey Nads, that's what they used in 1962 on 283's! Don't know why they did that but they went back to the regular type in 63. Yes, the pyramid on the end means powerpack heads. Max
Thanks Max and Pak, the dude told me to get my crank drilled and tapped for a retaining bolt, he did say those ****ers do eventually loosen after multiple removals over their lifespan. I love the HAMB, the answer is but a second away.
i dont think they had balancers untill 64 ish??? my 59 283 didnt, as fot it slipping off, ive heard about it happening, if you worried pull it off and reinstall it with some permatex sleeve retainer, plus it aint gonna hurt it to tap it and put the bolt there, itd **** to go throu the rad.
Nadeem The heads with the pyramids are usually thought to be 'powerpac' heads. I've got 2 different kinds, the 896 and the more desired 520(these are the last numbers in the casting code). The casting book sez both are 1.72/1.5 valve, 58cc chamber, 140cc runner(461 fuelie heads are 170cc,new aluminum heads run about 210cc), but refers to the 520 only as the 'powerpac'. The 520 was listed as 283/327-applied, but I think it said 896 was 283-only. Thats all I got.
****s even more when it comes off, bounces and takes out the fuel line coming from the electric fuel pump and dumps the gas all over the engine & headers. Resulting fireball in turn blows the hood off of a 57 chevy when it lights that engine compartment full of Sonoco fuel! Don't ask me how I know this... I didn't build it, I just drove it...
so what does this pyramid look like? my 327 came with heads that had a single hump on them in the center of the rectangle that more or less looks like a triangular extension off of the rectangle, as opposed to two rounded bumps coming off the rectangle on a douple-hump head.
When I got my '57 283, it had a big old nasty late model balancer on it. I got the correct one from Dampner Dudes ( if I remember correctly ) and I had the crank drilled and tapped because of the blower drive. If you dont have a balancer, what do you have? There must be some sort of flange to bolt the pulley's to... Can you show me a pic? Maybe I just payed a lot of money for a flange...
The engines that had 4BBL carbs or more had balancers. The 2 BBL jobs just had a hub with a sheel metal thing that was about the same shape as the balancer. That was so there was a place to put the timing mark. The pullys bolt on just like normal with the three bolts.
I thought the heads marked with the bloch with pyramid in the middle as the post before shows were two barrell heads. I thought the early powerpack heads were marked the "block shape lower and a pyramid in middle and on each end as well- anyone seen these"triple crown"-marked heads?
The 2BBl heads were the ones whith the rectangle and no triangle on top.The ones with the triangle were used with 4BBLs and fuel injection. The dual 4 engines (245 & 270 HP) used heads with the triangle and two tower looking things close together on top of the big rectangle. These heads had smaller chambers to up the compression. The fuel moters had pop up pistons so thay went back to the power pack heads to get better breathing by unshrouding the valves.
so how do powerpack heads run? i thought they were run-of-the mill equipment, so i bought double hump heads too.
I've got 4 pair of 'em sittin in my garage waiting to be rebuilt. I doubt I'll ever use 'em on anything. If you ask me they have NO performance value for anything other than a bone stock 327 or smaller motor.
so it's mostly a clever name then. i did some legwork and found similar results. i did seem to find that they work pretty decent on 283', so there's an option.
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