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Old 03-26-2006, 06:04 PM
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454 buildup

I have a 1968 chevelle that I am putting a 454 into. The heads I have are casting # 353049. They appear to be out of a 1970 to 1973 Corvette. They are open chamber and have 2.06 intake and 1.72 exhaust valves and the chamber is113cc. Are these decent heads? They don't have the larger valves. Can I make decent horsepower with these heads with the right cam?
Does anyone have recommendations for a streetable cam that can also make good horsepower with this combination?

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Old 03-26-2006, 07:38 PM
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Really good heads even with the smaller valves... Upgrade them to the 2.19/188 valves unshrouded and they will really come alive... A good cam for the street/strip with a fair idle but nice sound would be the Comp 280H with matched springs number #911`s...
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Old 03-26-2006, 09:31 PM
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Quote:
Originally Posted by Bumpstick
Really good heads even with the smaller valves... Upgrade them to the 2.19/188 valves unshrouded and they will really come alive... A good cam for the street/strip with a fair idle but nice sound would be the Comp 280H with matched springs number #911`s...

Without modifying the heads and using the cam you suggest, about what amount of HP should I expect?
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Old 03-26-2006, 10:32 PM
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What pistons does it have flatops or small domes...? Hard to say for sure just what HP it will make without knowing the rest of the config...?
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Old 03-27-2006, 06:29 PM
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It says here that they have 122cc chambers. Have you had them cc'd?

http://www.mortec.com/bbc.htm
353049.....73-84...oval...OPEN...454, 122cc chamber, 255/119cc ports

They are a great set of heads as far as stock goes. Here is an article with a set on a 454. They do have the 2.19 1.88 valves, but with the relatively small size of the cam being used, the upgrade may not have made as large of a difference as it can is some other cases. I would figure around 400 hp, 450 tq with the smaller valves and the cam and compression that they used in this article. You could also go with a larger cam and still keep it really streetable. More cam should make a considerable difference in power. With a little work, they can really make some hp. I have a friend with a 9.5:1 468 and a set of these that have been mildly ported with a 242 @.050 hyd roller cam that made 560 hp an 560 tq on and engine dyno with 20W50 oil (it may pick up a few more with synthetic). As far as the cam, I would recommend the XE268H (224 230 @.050 .515 .520 lift) or the XE274H (230 236 @.050 .552 .555 lift). I think the XE274H would make quite a bit more hp, and if you dont mind running a 2500 stall, it would be my choice. I would assume that you have at least 9.0:1 compression which should work ok with the XE274H. If you have less, I would recommend the XE268H.


454:
http://72.14.203.104/search?q=cache:...s&ct=clnk&cd=2

Adam

Last edited by firestone; 03-27-2006 at 06:35 PM.
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