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Old 06-22-2005, 01:53   #1 (permalink)
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302cc heads

hey guys has any1 here spent a bit of time getting a bit out of their 2v cc heads?
wat sort of flow have they managed and wat sort of hp numbers could they produce?
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Old 06-22-2005, 02:36   #2 (permalink)
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Re: 302cc heads

Quote:
Originally Posted by ziggs
hey guys has any1 here spent a bit of time getting a bit out of their 2v cc heads?
wat sort of flow have they managed and wat sort of hp numbers could they produce?
I have spent a fair bit of time porting my own 2v,s. Properly done they can flow around 275 cfm which ,by theory is enough to support over 550hp.Last time i had mine on the flowbench they were at aound the 240 cfm mark with a standard size 2v valve but since then the throat has been opened up considerably to suit a larger valve of around 2.1 inches. Going to a 4v size valve on the intake is not recommended but 4v exhausts are ok.
Given the amount of time it would take to achieve such results ( time = dollars),my advice is go with a set of alloys,that is of course if you can,t do it yourself.
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Old 06-22-2005, 03:59   #3 (permalink)
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Re: 302cc heads

i reackon u'd be able to put biger exhaust valves, porting, cc ing the chambers and rollers for less than the price of bare heads and it'd will be at 450hp to 500hp mark and wif an extra 800bucks in the wallet.
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Old 06-22-2005, 04:57   #4 (permalink)
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Re: 302cc heads

Quote:
Originally Posted by ziggs
i reackon u'd be able to put biger exhaust valves, porting, cc ing the chambers and rollers for less than the price of bare heads and it'd will be at 450hp to 500hp mark and wif an extra 800bucks in the wallet.
unless your doing the work yourself. I'd advise you to do your sums first. I advised another FF member who was a bit warey of the $. He found the 302 CC head worked out a few hundred cheaper max. This was last year.

I've been there and done it unfortunately. $3700 and 2 years later. I sold the heads 100% bare for $600. The were prepared for screw in studs etc. All that was needed to complete them was roller rockers/screw in studs/valves/pushrod guides, springs, retainers and collets.
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Old 06-22-2005, 16:37   #5 (permalink)
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Re: 302cc heads

I can't remember what CFM mine flowed but i worked out that they flowed an average of about 470hp. Will have to have a look at my flow sheets. They are 2V CC heads. I would like to upgrade to some alloys now though. I would recommend going and getting alloys, they are great out of they box. Will save a lot of hassle and should make more power than most irons, while being more compression friendly.
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Old 06-22-2005, 17:52   #6 (permalink)
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Re: 302cc heads

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I can't remember what CFM mine flowed but i worked out that they flowed an average of about 470hp. Will have to have a look at my flow sheets. They are 2V CC heads. I would like to upgrade to some alloys now though. I would recommend going and getting alloys, they are great out of they box. Will save a lot of hassle and should make more power than most irons, while being more compression friendly.
ives seen afd's out of the box and they needed a lot of work to bring them up to scratch, sure u could have used them but the chambers werent finshed properrly and the porting still needed a bit more work i dunno wat the chis r like out of the box but then u hav to buy his mainfold thats another 500-700 i think on top of the heads, and if the stock heads can flow it i cant see how the the alloys can be worth it on a street car where i'm not chasing tenths.
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Old 06-22-2005, 18:05   #7 (permalink)
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Re: 302cc heads

I should rephrase that. I have heard that they are great out of the box. I have not seen a set which are not already on a car. I am very happy with my 2V's though and can't really see myself forking out 3grand to replace something that works well. I think that the alloys would be that bit better and also weight saving. As brenx has said somewhere, just by sticking on his CHI's and changing nothing else he gained a considerable amount of rwhp. And by the sounds of it he had spent a fair bit on the 2V's which he replaced with the CHI's.
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Old 06-23-2005, 05:19   #8 (permalink)
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Re: 302cc heads

You don't have to buy the specialised manifold for the CHI's. I ran a weiand xcelerator on mine. Took a little bit of work but not that hard. CHI have now realised that people don't always want a high rise manifold. They now have heads available that accept any aftermarket or stock cleveland manifold.
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Old 06-23-2005, 06:23   #9 (permalink)
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Re: 302cc heads

[QUOTE=XFFAIRMONT]I can't remember what CFM mine flowed but i worked out that they flowed an average of about 470hp. Will have to have a look at my flow sheets. They are 2V CC heads.

wats the flow sheets say?? i've heard it'd be had to get
420-450hp out of em. wat sort of work did u do to them bigger valves and porting??
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Old 06-23-2005, 07:34   #10 (permalink)
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Re: 302cc heads

ziggs, the CHI 3V's (185 or 218cc inlet ports) come with free spacers to fit a normal manifold. Extra $500 not required.

CHI have just released their alloy 2V. All stock 2V parts fit like a normal iron head. These flow 300cfm at 0.600 valve lift and will support 600hp. You can buy a fully assembled set for only $2650. Remember hardened valve seats, pedestal machining for studs, bronze guides, port/polish, CC chambers, etc etc plus....SS valves, teflon seals, quality springs, retainers & locks - and labour to set them up. Price all that up and tell me what you get

There's no way you'd be able to get 2V irons ported and polished to flow that much or cost that cheap!! You then have all the other advantages of light weight, better thermal qualities, run more comp, better CC's etc etc. They also make a much larger torque curve too.
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