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  #46 (permalink)  
Old 01-28-2010, 11:11 AM
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Dibs on the welding helmet- that'd be SOME protection from flying tools, etc. lol

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  #47 (permalink)  
Old 01-28-2010, 11:23 AM
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lol well not to get in the middle of a discussion thats way over my head...but heres some responses to some of it

Quote:
V8fbrx7, how big is the current air filter, and what is its configuration(flat base, drop base, etc)?? How close does the hood and scoop come to the carb and/or filter??
i'm currently not running an air filter, the hood scoop is about 2 to 3 inches above the carb. I've thought about switching to a taller scoop and running a velocity stack but i haven't done it simply because of not knowing if its worth it this time around, i'm trying not to do anymore wasteful mods. BUT if you tell me you think it will help or know it will help its a cheap thing to do.

Quote:
If you don't want to put forth the effort to port the heads that's fine, but you need to at least run the 416's. I would port them, but I actaully enjoy working on cars, going fast, and getting dirty so I'm a little biased.

If you decide to port them PM me and I'll send you a few cartridge rolls and a mandrel, so all you'll need to buy is an electric grinder setup and some stones or a carbide bit.
i wouldn't mind porting them i just don't wanna screw anything up, i'm sure my dad knows how to port heads so i'll run it by him, we might have the tools laying around here. plus i'll be super excited to get these heads on i dunno if i'll wanna wait around once they come back from the shop.
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  #48 (permalink)  
Old 01-28-2010, 11:33 AM
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The w & w/o scoop difference in performance is interesting.

Possibly the scoop's causing turbulence that's confusing the carb- you could try using a short filter (or drop based filter), like I'm sure ericnova72 was heading to when he asked about your filter set-up first.

Any filter- as long as the top is a couple inches from the vents- will be better than nothing. Some filter bases actually help flow, others can hurt- but they all will keep dirt out (or should, anyway).

I'd be interested to see if it helped any.

With your CR being so low, you can max the timing w/o worries of detonation from timing, at least. You still won't need more than 36 degrees or so, but you can get all of it, and the timing can be brought in early- especially w/the weight, gears, etc.

I'm still thinking there's HP being left on the table, untapped.
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  #49 (permalink)  
Old 01-28-2010, 11:51 AM
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Are all 416 heads compatible w/non self aligning rockers?
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  #50 (permalink)  
Old 01-28-2010, 12:02 PM
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Quote:
Originally Posted by cobalt327
Are all 416 heads compatible w/non self aligning rockers?
Everything I've read says they are. In 87 w/center bolt covers the head casting# changed.
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  #51 (permalink)  
Old 01-28-2010, 12:16 PM
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Quote:
Originally Posted by SSedan64
Everything I've read says they are. In 87 w/center bolt covers the head casting# changed.
Ahhh, I didn't think the 416's had parameter v-covers.

Thanks for bringing me up to speed, I've never used these heads, in fact until I came here on this forum I had thought there were no good 305 heads.

Now, I read the 601 has 58cc chambers, and I also hear good things about the 440 head being much the same as the 416.

And I've heard "462624 76-78, 305, 58cc chamb, 1.84/1.50 valves, hardened seats, accessory bolt holes, best of the 305 heads".

Any comments?
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  #52 (permalink)  
Old 01-28-2010, 12:26 PM
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Another one.

Chevytalk.org says: "The 305 (LE9?) also ran 53cc chamber 601 heads with 1.84/1.50" valves which have a better combustion chamber design than the 416s used on cars and flow more than the 416 car heads."
The (LE9?) is mine, BTW.

The info on the 624 being "best", (above in last post) came from HERE.
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  #53 (permalink)  
Old 01-28-2010, 12:55 PM
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Quote:
Originally Posted by cobalt327
Another one.

Chevytalk.org says: "The 305 (LE9?) also ran 53cc chamber 601 heads with 1.84/1.50" valves which have a better combustion chamber design than the 416s used on cars and flow more than the 416 car heads."
The (LE9?) is mine, BTW.

The info on the 624 being "best", (above in last post) came from HERE.
I haven't read much about the 624's, I've read a lot of different Info on the 601's, some say 53cc some 58cc. All I've seen had 53cc with the Closed Chamber design & 1.84"/1.50" valves. Also some list 1.72/1.50" & 1.72"/1.30" valves and 1.84"/1.50" valves. These also came on the 267c.i. engine, I'm thinking those probably had the 1.72"/1.50" valves.
I think I posted some flow #'s that compared the 416's to 601's on here that I found on SSMonte site but can't find it now, maybe I just posted the link. Also read 601's are Thick castings & 416's are Thin castings. I don't have any now to examine tho'. http://www.chevytech.com/3c10o8.html

Last edited by SSedan64; 01-28-2010 at 01:23 PM.
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  #54 (permalink)  
Old 01-28-2010, 01:12 PM
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If your porting and the valves and seats are already done make sure you don't skid the carbide burr or stone across the fresh seats or head surface, That would be a bummer... You even have to be careful not to ruin anything with the collet of the die grinder. Mistakes that cost you money can happen quick. what kind of shape are the heads you found? need work or bolt on? If you are going to change springs and you can afford to have the heads resurfaced that would be best but when I was 16 we were bolting 289 heads on 302's and other low buck swaps for more power without resurfacing heads.. Perhaps it only worked because we didn't know better?

I would start off getting some compression and I'm sure you will be much happier. I don't imagine you spend a whole lot of time above 5000 rPM anyways?
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  #55 (permalink)  
Old 01-28-2010, 01:19 PM
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Cobalt, all the sites I've looked through don't show the 624 as a 305ci head??
http://www.gmcastings.com/
http://www.chevytech.com/3c462624.html
http://www.chevytech.com/3c458624.html
http://www.chevymania.com/chevymania...p=head&block=S
http://www.mortec.com/castnum.htm
Maybe a CarCraft misprint or that site.
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  #56 (permalink)  
Old 01-28-2010, 01:36 PM
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Quote:
Originally Posted by airboat
If your porting and the valves and seats are already done make sure you don't skid the carbide burr or stone across the fresh seats or head surface, That would be a bummer... You even have to be careful not to ruin anything with the collet of the die grinder. Mistakes that cost you money can happen quick. what kind of shape are the heads you found? need work or bolt on? If you are going to change springs and you can afford to have the heads resurfaced that would be best but when I was 16 we were bolting 289 heads on 302's and other low buck swaps for more power without resurfacing heads.. Perhaps it only worked because we didn't know better?

I would start off getting some compression and I'm sure you will be much happier. I don't imagine you spend a whole lot of time above 5000 rPM anyways?
Porting isn't just for over 5000 RPM, when done properly it'll give more power even off idle.

GREAT point about the seats though, which is why I recomend using a carbide bit with a 4" shank, it makes it a LOT easier to work with.
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  #57 (permalink)  
Old 01-28-2010, 02:00 PM
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I agree regarding porting beneits at lower rPM's ap72! I like the long burrs as well! Except at real high RPM's, need to use with a regulator for sure!

He's getting a lot of good information and opinions and ultimatly he has to make up his own mind how much money he wants to spend, the amount of time he is willing to spend and the RISKS involved doing more work to the heads or cutting corners.. I'm just saying compared to those 76cc heads he should be real happy with ANY DECENT 305 casting even in stock form. As far as resurfacing the heads, well what about the block then... Corrosion around waterjackets etc.. I haven't had any bad luck with steel shim gaskets.. Not to say he won't or I won't in the future but nothing is ever perfect.
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  #58 (permalink)  
Old 01-28-2010, 02:25 PM
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Quote:
Originally Posted by SSedan64
Cobalt, all the sites I've looked through don't show the 624 as a 305ci head??

Maybe a CarCraft misprint or that site.
THAT wouldn't surprise me!

Thanks for the info.
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  #59 (permalink)  
Old 01-28-2010, 09:38 PM
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ok you guys scared me there, in case you forgot 462624 is the casting number on my current heads lol and if someone was about to say that those weren't that bad of heads i'd be pissed because i just dropped off the 305 heads at the shop today, but those sites that Ssedan64 posted all show what mortec.com said where the 624 casting are in fact 76cc heads.

On a side note i did order a HEI today from skip white so i hope that gets here soon and i can get my ignition timing all fixed up i will be ordering a timing tape for my balancer too just to be sure. (no i don't have one maybe thats part of my problem like cobalt 327 is saying lol)
And as far as the filter is concerned the hole for my scoop is only like 8" diameter because my scoop isn't very big, so i HAD a tiny 8" filter on there but all it did was rob even more power believe it or not lol, i think if i had a standard 12-14" drop base aircleaner on there i'd be ok then but i've got to find a bigger scoop first i might do that too, LUCKILY the car is in primer ugly stage so i don't mind doing that.

i REALLY appreciate the help so far!!
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  #60 (permalink)  
Old 01-28-2010, 10:44 PM
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AFA the 624's- I see the same thing (76 cc), the other was prolly a misprint.

As for checking the cc's- there are syringes available used to measure 2-stroke oil that will work fine. Available in Wal Marts everywhere. The previous conversion I printed was in error.

Last edited by cobalt327; 02-04-2010 at 03:23 AM.
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