|07-19-2006 04:07 PM|
|07-18-2006 02:47 PM|
|cool rockin daddy||yep, you sure do have a lot of choices. But for the cam he is running, he needs a 180 cc head or smaller.|
|07-18-2006 02:09 PM|
|chrismac||hey you can get good heads off of ebay. I payed 600$ for a set of new aluminum heads bare. They were manufactured from RHS. 235 cc intake runners and 72 cc combustion chambers. I watched ebay for good deals on them. I have seen the sportsman 2s go for about 500$ complete. My father run the sportsman heads for 10 years on a 327 for 10 years before a valve broke when i turned 16. Your options are almost endless when it comes to heads under 1g.|
|07-18-2006 08:50 AM|
|cool rockin daddy||I think that is a wise decision. When it is time for me to get my new heads (hopefully) I will be going with Iron Eagle 180's or, if I win a lot of jackpots bowling and can afford them, the Dart Pro 1 180's in aluminum. Good luck. :Cool:|
|07-18-2006 08:04 AM|
|Old Yeller 1970||
|07-18-2006 07:59 AM|
|Old Yeller 1970||Good luck. Be sure to let us know how it turns out.|
|07-18-2006 07:47 AM|
|rac43||Thanks lots and after reading all of the post I have decided to go for the Iron Eagle 180's. They best suit my 222/22 cam as far as I can tell. Thanks to everyone, I needed your help! This is better than living next door to a hot rod shop!|
|07-18-2006 07:35 AM|
|cool rockin daddy||You better start thinking about matching intake port size to how you are going to drive. .222/.222 cam is not very radical. That's the average duration of a Comp Extreme Energy 262 (.218/.224). You have been talking about GM heads which are 170 cc intake port volume at the max (unless ported). Now you are talking about Sportsman heads that come in at 200 cc intake port volume which is TOO BIG for a mild street car! The car will be a slug at lower speeds with lazy throttle response. You want to keep your intake ports around 180 cc's or less for snappy response and good low end torque with mild cams. I know, I have a .030 over 350 with flattops, above mentioned cam (.470 lift), performer manifold, Demon 650, and pocket ported 041 GM heads. Every single head manufacturer I have called have told me unless I want to go more agressive with the cam and stall converter, stay with 180 or below heads! By the way, that engine has about 9.5:1 compression ratio and I have no problem with 91 octane gas. Compression ratio is one thing, intake port volume is another. Match the heads to what the cam is capable of delivering. If combustion chamber is too big have the heads milled so you get a chamber size of 68 cc to be really safe. One more thing, Chevy High Performance tested the Dart SS heads and they really did okay. Don't get taken in by flow numbers alone, it is how and when the air moves in a port, and how the air/fuel mixture burns in a certain chamber design that gives the power. I would really try to find a set of Dart Iron Eagle 180's on e-bay or your area.|
|07-17-2006 04:47 PM|
|Old Yeller 1970||
Vortec heads only come with 64cc chambers, so I really don't think that's an option.
The Dart Iron Eagle 180's with 72cc chambers would give you about a 9.37:1 ratio. With your 222 cam and 92 octane you might be in the money.
|07-17-2006 04:30 PM|
|rac43||Thanks to all that replyed to this post. Do you think I would just be better of switching to Vortec heads? With my 222/222 cam, would I be able to get away with getting smaller 68-72cc heads? I could use a thicker gasket to get my compression down by about .5. Please give me your advice.|
|07-17-2006 04:10 PM|
I have Sportsman IIs and have been running about 9.8:1 compression for about six years now on 92 octane with no problems...
You have to remember that the modern combustion chamber designs can tolerate somewhat more compression than those on the older heads.
|07-17-2006 04:02 PM|
theres several 441 76cc combos on http://www.ryanscarpage.50megs.com/combos1.html page and having a fresh set of 441s on my shelf with 3 angle valve job and ported & polished with some bigger valves 2" stainless intakes ad 1.60 exhaust stainless valves (if I remember correctly) & gasket matched, comp springs and retainers & screw in studs ect. (I bought/traded a holley & a hei that all needed rebuilt but was not junk either, and the heads were fresh done, we swaped for $150 and parts) they been on the shelf for a yr & a 1/2 now and I'm going to use em. I know there not the best and I would not send a set to the machine shop either,
I would buy something like a set of aftermarket heads or vortecs, depending on what I was building, but really even camel humps aren't worth the machine work/money unless you need em for the look or # matching setup. and in the back of my mind I've thought for this next build in the 87 Suburban if I can buy a set of runable vortecs from the salvage yard I might. vortecs would work on this Suburban project, and I know vortecs are not the best for every application and some aftermarkets are a better choice for some bigger performance builds. a good friend I grew up with is in the office in a salvage yard, so I get some fair deals.
|07-17-2006 03:53 PM|
|Old Yeller 1970||
If you have 9:1 now the 68cc heads will put you at 9.78:1. I seriously doubt if it would be streetable on pump gas.
Since you are already close to 9:1 you won't be able to run anything much smaller than a 76 cc head. You might get away with a 74 cc head which would put you at 9.18:1. 72cc heads would yield 9.37:1.
But some where in there your going to run into detonation. The 222 cam will bleed off some cylinder pressure but with iron heads you can't go real high on the compression ratio.
|07-17-2006 02:31 PM|
|07-17-2006 12:57 PM|
You could try a set of World Sportsman II, The have a 200 cc intake runner, and the 72 cc chamber is availiable. Qutoe from their site:
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