A lil while ago he mentiond something to me about a set of 305 HO heads that would be great for a lil 283 but i cant remember what the casting number was. It was a specific number that i was looking for, something like 401. Im not a hundred percent sure though. Could someone hlp me out. I think i may have found them in my local classifieds.

601

Are you sure? those are the ones with 1.84 1.5 valves and 58cc chambers

1.84 intake, 1.5 exhaust

The 4 barrel 450 and 416 castings work well too.

My #416 heads work too good, my Elky refuses to hook up!

I ask this b/c there is a pair of rebuildable core 416's for sale in my paper. Right now i have stock heads on my 283. Should i get them, build them and use them for my 283

Most will GIVE you a whole 305 to free up garage room.
Do not spend but small cash for them. See if Fryntyr has some clogging his shop.
I have not seen any 601 chambers

I believe it was the 601 i want b/c they have 53cc chambers. Unless i have it backwards and i want the ones with 58cc chambers. It might be those b/c i could put bigger valves in it, or something like that. Me and PD had a really long pm about it but it got deleted on accident. What will the 53cc's do to my compression verse the 58cc's

Did a set of 416's with the 1.84's/1.5's for a 283 in a 64 nova not to long ago. Made a noticable difference. Leave them the size they are and do some pocket work. Larger valves will require unshrouding and when you do that you take away the smaller chamber so don't bother. With the velocity and efficiency increase of the pocket work you'll get better fuel economy and power to boot.

-601's are down around 52 to 55 cc's and have a double-quench chamber like the original fuelie head, the -461! As well as 1.84"/1.50" valves, hardened seats and right at 160 cc intake ports!

You gotta cc them so you know for sure and then watch your CR.

The -416's have more squared off chambers like W/P's S/R Torquers.

pdq67

The 601 head has a very thick chamber and can be worked over to whatever shape you want I exagerate the double quench and unshroud the valves more and end up with 61cc and no fuel wash problems runners come out to 170-172 after porting with 1.84 valves
Raise the ex. port and blend the ssr best you can and try not to remove any material off the ex floor
I have noticed some differences in the 601 ex ports some heads have an abrupt ssr and others have a nice thick ssr to work with
Some old guys have seen some of my finished heads and at a glance when looking at the chamber they imediately say oohhh 461's

Darryl,

With all the cylinder heads lying around your area, could you post pics of the 416 and 601 chambers? Might as well hang a 461 chamber pic too

Darryl,

With all the cylinder heads lying around your area, could you post pics of the 416 and 601 chambers? Might as well hang a 461 chamber pic too


YEs, I'll have to work on a pic showing the different chamber designs.

I've seen engines with a 624 on one side and a 450 on the otherjust because they are light weight castings and the chambers kinda look the same if you don't REALLY look at them. The 601's are obviouse from 20 feet away. Imagine the engine with 58cc's on one bank and 76cc on the other probably ran weird.

Here you go Blake, a set of 416's for $25. Look to be 1.84 intakes, I'll blow the pic up and see for sure. Bonus,,,they are local.

Yep, blew the pic up, they are 1.84's.



Small-block Chevy Cylinder Heads - $25
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Reply to: sale-595945302@craigslist.org
Date: 2008-03-05, 6:59AM PST

Worked good when removed from engine.

I figure you had 10-12 pair of these from your roundyround days

Sold them or threw them away. Like I need 15 sets of 305 heads laying around. Heck I only have a dozen sets of cammel humps. I have enough stuff pack-ratted away anyways. I Try to only keep hard to find stuff that would cost me $$ to get.

Im really enjoying all the great information you guys are just showering me with. BUT i hate to be like this but it doesnt really enswer my question. I cant really do much with my 283 so im trying to squeeze as much hp tq numbers i can get. 1 or 2 hp might not seem like alot to you guys b/c you have 572bb but its alot when im only making 200-220hp. Which is totally ok, just sometimes your gonna have someone asking you questions that might not mean much to ya cause you are so past a couple hp. But again thanks for all the help and if someone could really tell me wich head is gonna work better. Im all ears :)

Use the 450 or 416, leave them the stock 1.84-1.5 valve size and do a little pocket port work. They really respond well to fixing the short side radius and cleaning up the rest of the bowl restrictions. Noticable seat of the pants difference and better fuel economy. Youl get much more than a few HP increase.

Go the 601's if they'll get you closer to the compression ratio you want and if you do, perform the same pocket work.

Ok so im assuming bigger cc's will get you a bigger comp ratio? I tried to use a comp calc online but they needed my piston area and stuff. I tried to track it down on the net but couldnt find it.

Can someone helpme out and let me know where i could find the specs on the stock cam in my283

Heck, I'd have to look up the stock 283 specs.

The SMALLER the chamber the higher the CR. So, with the same piston, a 58cc chamber will give you more CR than a 64cc chamber.

Go to the KB Piston site
http://kb-silvolite.com/performance.php?action=search&mfg=CHEVY&EngSize=283&RodLen=5.7

I already took you to the 283 hypereutectic pistons.
Click on DETAILS to the right of the screen....takes you to a calculator, figuring .030" overbore. The 896 head with this casting symbol on the front __/\__ have about a 60cc chamber, makes 8.9:1 on the KB calculator wth the KB165 flattop. Going to 58cc you have about 9.2:1, 56cc=9.43:1

283 cam is .3987/.3987" lift (IOU deg dur, etc)
1967 cam with .398/.410" 195/202* @.050 lift, 112* LSA
Same as a bazillion standard Chevy cams.....

Dude your the man :thumbsup: thank you so much. Are you going to be there on the 21st by chance?

Why shouldnt i put 1.94 1.6 valves in a set of these heads?

Why shouldnt i put 1.94 1.6 valves in a set of these heads?

You don't need it and would have to unshroud the valves to gain any flow which would make you lose compression. A mild 283 doesn't need bigger valves than that, just more efficient fuel/air charge which the pocket port will give you. A pocket ported set of those will outflow a set of unported 1.94's stocker heads

Thanks much :D

Try not to overthink what you need and throw wasted money at your motor that will gain you ZERO. Put the work and money where you'll see a decent benefit and save your $$$ for something else.

Makes sense there sir, like a rear end or tranny

Blake,

What Darryl said 2x
My 416 heads were given the 2.02/1.60" valves, throated under the valve, and the chambers were relieved. From the look of them, they took a pass on the surface to get the compression back up after the chambers were relieved. I have no idea what these heads cost, a lotta work on them including some halfway decent springs. The jury is out on if the heads flow well....unknown small cam in there but the secondary side of the carb never delivered right, then finally died the last outing.

I definitely intend on being there 21 MAR....someone ELSE will get "the title"

Hahahahaha yea dont mean to be pesimistic but im more realistic. I will be taking that title with a smile. If im not the fastest i woul rather be known as the slowest so i dont have any excuse as to why im not first.

hear are some #'s 416 head pocket ported worked guides raised exaust runner opened pushrod pinch polished chambers no removal no unshrouding
1.7? intake valve 1.5 exaust 280 h-10 comp cam flattops 350 2x4's 600cfm on an old tr1yx 78 nova 9" and 457 gears 2200stall 91 octane 41 degrees total 6400 rpm shift 12.53 at 105mph on 91 octane 7-11 racing fuel
Conclusion - dont worry about bigger valves ...That above combo was a bunch of stuff we had laying around ..not thought out just threw together

The car now runs 601's with 1.94-1.50 and a 292comp to the tune of 11.90's with 91 octane at 113 mph and some change 7500rpmshifts

Them tiny heads are very capable of feeding a smaller engine

The old -929 cam should be stock in a 195 and 220hp/283.

And fwiw, the 315hp/283FI engines ran 170 cc port -461x heads w/ 1.94"/1.50" valves if I have this right w/ no more than the old -097 Duntov solid cam so go figure!!

Imho, the old -097 Duntov is STILL a heck of a cam to this day even if it is a little-bitty sucker...........

pdq67

Calm down Paul! : )