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Old 08-22-2004, 04:29 PM
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64 cc heads for 383 stroker..

hello everybody.. I'm building a 383 stroker engine.. I have the block and I just bought the heads #3973370.. I looked up this number and they are built in 1969-1970 for 300 hundred horse power high performance heads.. I would like to know if the seats will be compatable with unleaded gas or should I put new hardened inserts in before proceeding with valve job?..

thanks

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Old 08-22-2004, 07:15 PM
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You definitely need hardened valve seats. I can't find this head so can't talk about it. I assume it has 2.02 intake valves. You will have to use dished pistons to get the compression down or it's going to be a pinger.

Trees
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Old 08-22-2004, 07:37 PM
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The valves are 1.94 & 1.48, can I bore them out, & how many thou should I leave for press fit? the heads have been cleaned & checked for cracks which is ok thanks
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Old 08-23-2004, 03:45 AM
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Im thinkin you should have no problem having the seats cut for 2.02/1.60 valves. As for the hardened seats, only the exhaust valves need the hardened seats for unleaded fuel.
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Old 08-25-2004, 12:15 AM
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i can't find that head # in any chevy info and how do you come up with 194/148 valves?
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Old 08-25-2004, 09:45 AM
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I've never heard of that head number. Can you check it again?

If you open up the 1.94s to 2.02, you should also have the intakes unshrouded. Somewhere I read that unless this is done it will actually hurt performance. I've got an unshrouded set on my engine now that I'm going to swap out for a "real" 2.02 set and a cam change.

I agree that you only have to harden the exhausts.

My 383 has flattop pistons with 64cc 462 heads and it's only at 9.7 static compression.
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Old 08-25-2004, 11:58 AM
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You sure?!

You Entered:
Bore 4.03 (inches)
Stroke 3.75 (inches)
Rod Length 5.7 (inches)
Cyl. Head Vol. 64 (cc)
Deck Height 0.025 (inches)
Head Gasket Bore 4.166 (inches)
Head Gasket Thickness 0.041 (inches)
Piston to Cyl. Wall Clearance 0.003 (inches)
Top Ring Land Height 0.25 (inches)
Piston Dome Vol. 0 (cc)

Compression Ratio:
10.993 : 1

Bore / Stroke Ratio:
1.075 : 1

Rod / Stroke Ratio:
1.52 : 1

Total volume:
862.44 cc's

Compressed volume:
78.451 cc's
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Old 08-25-2004, 12:06 PM
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Quote:
from chevytalk.com "3973370" A good over the counter head. They had 64CC combustion chambers, supposedly straight or angle plug configuration. I used a set of these on all 3 of my 383 strokers, they originally came with 1.94/1.50" valves. We did some major port massaging and installed 2.02/1.60" valves, they responded very well to the modifications and worked very well. The combustion chambers were 64CC's. These were a decent iron head, with a lot of potential for performance.
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Old 08-01-2008, 10:01 PM
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3973370 Heads

The heads are actually a 69-70 over-the-counter GM high performance heads. GM put 1.94 intake and 1.56 exhaust valves in them. NO they are not 2.02's but personally, for street racing, these are better at lower rpm's. The combustion chamber is 64cc. So with Flat top pistons in a 350, you will yeild 10.1+:1 compression. Watch your Head Gasket thickness. I'm using Keith black pistons(#KB106) and with a .028 head gasket, I will have 10.8:1 compression. By the way, summit racing has a "desktop dyno" which is really cool. Buyer beware---->My wife gets pissed at me for spending too much time on the computer and wonders "what on earth could you be doing?"
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Old 08-01-2008, 11:48 PM
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how would the Gm vortec heads compare to these? cause i've heard the Vortec heads flow great. and they are only like $500 for a pair
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Old 08-02-2008, 01:13 AM
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my advice buy the vortec heads. you will have less into them by experience and truth be told they are better. even a decent port job can't help the old helds vs. the vortec heads. i redone a set of 041x heads which were a decent head but i had 600 and some change into them after having them all redone with the hardened seats. why pay more for less. good luck
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Old 08-03-2008, 09:37 PM
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Vortec???

Yes, I've heard they are better all around. Excellent flow and small combustion chamber. I've also heard that your limited to intake manifolds??? Not too sure how true this is.
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Old 08-04-2008, 09:44 AM
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those heads are just like 041, 186, 492 castings. they are an over the counter replacement. those are good heads. vortecs would make a little more power, but their bad about cracking because their a light weight casting, & your going to shell out a lot more cash for a good intake. to run a big lift cam on the vortec's they have to have the valve guides machined down. i'm not saying the vortecs suck, but you never hear the bad side to them. the old double hump heads have made good power for years & have been reliable. 1.94-1.5 valves, 160cc runner, with a 64cc chamber. i would put hardened seats in them & stainless valves.

both the vortec heads & the 370 heads will need work. springs & valves & some machining. seats on one or guides on the other. both are good heads.
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