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Old 01-07-2008, 09:45 PM
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327 stock heads

i have a set of 327 stock heads cast #3795896. i am putting them on a sb 350, i am curious on what the biggest cam would be recommended. the cam i have is a 282/292 lift and 465/488 duration. and i am running a 650 holley with a edelbrock performer intake. i want to make sure the came is not too big before i put it in. any help would be appreciated. thanks

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Old 01-07-2008, 10:21 PM
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327 heads

Power pack heads used on 283 and 327 engines in the early 60's. Small 60cc chambers, but also small valves and ports. You said they're STOCK; they won't flow much, and are going to choke up a 350. You need better heads, like vortecs.
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Old 01-07-2008, 10:43 PM
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i heard that the heads wont run on unleaded fuel. is this true. and how much does a set of vortec heads run.
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Old 01-07-2008, 11:32 PM
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you can pick up a set of iron vortecs from summit racing for about $280 each, assembled...1.94 in/ 1.50 ex valve size...the only major limitations with the cheapest ones as far as I know is lift...so you'll want to check on that, as long as your not going to get all that close to 5.0" of lift then you should be good...
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Old 01-08-2008, 07:39 AM
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Those heads will "run" on unleaded fuel. The issue is the stock valve seats are not hardened enough to handle the higher temperatures/less lubrication of unleaded fuels and will fail much sooner if unleaded fuels are used. When these older heads are reworked by a competent machinist, hardened valve seats will be installed and they are good to go. Your particular heads were used on the first 327 powered Corvettes and were good for 250 HP. Installing them as is will limit the capabilities of the 350 so as stated before: not a good choice for the 350.

Trees
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Old 01-08-2008, 11:01 AM
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Quote:
Originally Posted by DR132
as long as your not going to get all that close to 5.0" of lift then you should be good...
Holy crap 5 inches of lift!!! That would be awesome!! Just Kidding.
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Old 01-08-2008, 12:14 PM
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^^ lol...yes that would impressive...you know what I meant
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Old 01-08-2008, 12:21 PM
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As mentioned, the 896s were small (1.72" intake) valved heads. I've seen them opened up to 1.94, but I don't think they would perform that well on a 350 because of restrictive ports.

Hardening the exhaust seats is a toss up and depends on how much you're going to drive and what kind of driving you will be doing. If you're going for a weekend cruiser, it's probably a waste of money when you figure the cost of machining and new parts. You can buy a lot of lead additives for the money.

Vortec heads are a good replacement choice for performance at low cost. But, they require a Vortec style intake and center-bolt valve covers. Not good if you're going for a restoration. Also, I've read varying guesses at how much lift the stock Vortecs can handle, anywhere from .430-.470", which would mean machining with your cam.
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Old 01-08-2008, 06:24 PM
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ok thanks for all the info but does anyone know if my cam will work with these heads. stock no reworking of the heads.
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Old 01-08-2008, 06:51 PM
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Work?

Well, the heads will ,"WORK". You just won't see the best benefit on the cam you have; which by the way you have transposed your lift-duration figures, but everyone knows what you meant. Your compression may be a bit high, and most likely premium gas will have to be used. How long the seats last is anyones guess. But, yes, the heads will, "WORK".
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Old 01-08-2008, 09:56 PM
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That cam is probably too big, I think the duration is 224/234 @ .050". I bet those heads would work decently on your 350 with a 204/214 camshaft. With those heads and the 204/214 cam you can use the stock converter and you could probably even run exhaust manifolds instead of headers if you wanted.

http://store.summitracing.com/partde...2&autoview=sku

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Old 01-08-2008, 10:12 PM
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Quote:
Originally Posted by Double_v23
Holy crap 5 inches of lift!!! That would be awesome!! Just Kidding.
i second "holy crap" and with that kind of lift be sure to check you piston to valve clearance...
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Old 01-11-2008, 07:57 PM
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thanks for all the help and advice. but i am going to just stick with a stock cam and a two barrel. ill prob get some vortecs later and go from there. again thanks. sure am glad i talked to someone before i did something bad, like bend a valve, pushrod, or even break the cam. ill just play it safe for now
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