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post #1 of 9 (permalink) Old Jul 18th, 09, 01:26 AM Thread Starter
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wayne
 
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heads

what do you guys think of these heads? casting number 376450 with 2.02 1.5 valves. I think i was screwed by shop. I was supposed to get Casting number is 3998993 date codes c23 c13 .
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post #2 of 9 (permalink) Old Jul 18th, 09, 03:15 PM
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Mickey
 
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Re: heads

I'm not quite sure how to answer your question.I think both heads are crap for high-performance.We need more context. What are your plans with these heads? What engine are they going on? Stock or hipo? Neither head is anything special. You sure you have 2.02 valves in the 376450's? They are small valve heads,usually 1.72's. They also have a very small combustion chamber that will do you more harm than good. How did you get screwed? Was one head promised and the other delivered? Why didn't you get the 993 heads? Personally I think the 450 head is good for a boat anchor (because my perspective is high performance) and the 993 is good for putting on a stock motor.
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post #3 of 9 (permalink) Old Jul 18th, 09, 03:25 PM
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Re: heads

3998993....72-73...307/350......75cc chambers
3998993....current..350.........Goodwrench crate motors,"Hecho en Mexico", 75cc chambers

Vs.

376450.....75-81...262/267/305..6 or 7 exhaust bolt holes, 60cc chamber


I would think the 376450's would have small runners and valves, if they put bigger valves and you can open up the runners, they would build power well. I don't see how a 60cc chamber is dangerously small and how it would make less power vs. a huge 75cc chamber smog head.

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'14 5.0 Mustang
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post #4 of 9 (permalink) Old Jul 18th, 09, 03:44 PM
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Bill
 
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Re: heads

Wayne,
Depending on the piston, the "450" heads will give you a lot higher compression ratio, possibly too high for pump gas. You said that they had 2.02 / 1.50 valves ?? I am not even sure it is possible to put 2.02 valves in those heads. I will have to look at one on Monday, but I did not think there was enough room to do it without really hacking into the side of the chamber.

That being said, depending on your total combination and what you are trying to accomplish .... we tried them on a circle track 355 a few years ago. They made gangbuster torque coming out of the turns, but ran out of steam about half way down the straight, probably around 4800 rpm or so if I remember correctly. That was with the stock size 305 valves. We tried them because the class was limited to a flat top, 4 valve relief piston and with the 305 heads we could get 11 to 1 compression.

So if you are looking for a low rpm stump puller thay would probably be ok. But if you plan on spinning the engine up in the rpm's, forget it.

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #5 of 9 (permalink) Old Jul 18th, 09, 04:12 PM Thread Starter
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wayne
 
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Re: heads

i have a 406 with Saturday Night Special Camshaft; Hyd.Flat Tappet; Racing; RPM 2800-6400; Adv.Dur. 284 Int./290 Exh.; Valve Lift .480 Int./.494 Exh.; Lobe Angle 106 deg., 750 dp holley, gear drive, edelbrock air gap intake, 1.6 roller rockers, 350 trans, 2200-2600 converter, 373 out back.

i started out with 185 casting heads with 1.74 1.5 valves. i want a cheap upgrade to 993 casting heads with 2.02 1.6 valves. thats what i paid for. then i was shipped 376450 heads with 2.02 1.5 valves. i looked them up and they say 70cc heads. i talking to the shop now the guy who handles over the internet orders is off for weekend.

im not looking to race the world but will have fun on weekends.
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post #6 of 9 (permalink) Old Jul 18th, 09, 04:22 PM
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AJ
 
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Re: heads

I didn't realize you were running a 406, in that case your compression may be high with the 60cc heads. I don't think you will see much of an improvement with just bigger valve heads, especially with the small runner on a large ci motor. If worse comes to worse, sell both sets of heads to fund a set of worked double humps, they are relatively cheap if you don't go wild with them.

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'14 5.0 Mustang
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post #7 of 9 (permalink) Old Jul 18th, 09, 06:01 PM
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Re: heads

Quote:
Originally Posted by ace's68 View Post
If worse comes to worse, sell both sets of heads to fund a set of worked double humps, they are relatively cheap if you don't go wild with them.
993s have the same port sizes as hump heads just 76cc chambers.On a flat top 400 you get 9.8 or 10 to 1 depending on on piston valve reliefs and gasket size.

67 Plum Mist Met. 408 TH350 3.08 posi
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post #8 of 9 (permalink) Old Jul 18th, 09, 09:47 PM
 
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Re: heads

I figure the 305 or whatever heads back then will have at least 158 to 160 cc intake ports so even if they only have 1.84"/1.50" valves in them, they are still winners BUT BE DAM SURE to cc them so your CR doesn't go through the roof.

My 305HO, -601 heads out in my garage cc at 53 and 55 cc's w/ 160 cc intake ports.

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post #9 of 9 (permalink) Old Jul 19th, 09, 07:47 AM
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Re: heads

I think this picture says all there is to say about camel hump fuelie heads. Happy days are here again, if I could only find my tube of Brylcreem and had enough hair left to comb!



I'm not getting any younger nor are these arcahaic old heads, buy Vortecs

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