BBC Heads HELP - Casting# 3993820 - Chevelle Tech
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post #1 of 14 (permalink) Old Feb 6th, 07, 10:40 PM Thread Starter
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Matt
 
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BBC Heads HELP - Casting# 3993820

Can your guys please help me out regarding some Heads!

Casting # 3993820 if I search it tells me they are 113cc oval port for 1971 402/454. It was originally told to me they were from an LS-5 454??? How can I be sure?

Also there are some other #'s on them.....
-PA88 & F24 70 (what do these mean?)

These were taken off good running car and are still assembled. Any ideas what these are good for (Value as well as Performance)?

Any help appreciated.

Thanks Matt
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post #2 of 14 (permalink) Old Feb 6th, 07, 10:55 PM
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Jim
 
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Re: BBC Heads HELP - Casting# 3993820

3993820= 1971, oval port, open chamber,113cc chamber, 402ci.

F2470= June 24 1970

The same casting # was used for 71-84 454, but I think the date makes it an early 71
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post #3 of 14 (permalink) Old Feb 6th, 07, 11:39 PM Thread Starter
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Matt
 
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Re: BBC Heads HELP - Casting# 3993820

ANY Other ideas? "Any ideas what these are good for (Value as well as Performance)?" What does the "PA88" mean?
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post #4 of 14 (permalink) Old Feb 6th, 07, 11:46 PM
rb
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Re: BBC Heads HELP - Casting# 3993820

Double check thePA88 just in case it is PASS which would mean "passenger" car, as opposed to truck application. I'm no authority, but this sounds like quite a coincidence.
Sorry if this was too obvious and you are already past that point. A great source to check besides this forum is called Mortech. I am sure someone will post the address for you.
R.B.
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post #5 of 14 (permalink) Old Feb 7th, 07, 2:15 AM
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Matt
 
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Re: BBC Heads HELP - Casting# 3993820

http://www.mortec.com/bbc.htm
Its on the bottom half of the page.
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post #6 of 14 (permalink) Old Feb 7th, 07, 2:29 AM
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Re: BBC Heads HELP - Casting# 3993820

They have the same runner size as the popular 781 and 049 heads. There are a couple guys here running them with good performance.
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post #7 of 14 (permalink) Old Feb 7th, 07, 3:30 PM Thread Starter
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Matt
 
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Re: BBC Heads HELP - Casting# 3993820

Are these worth anything if in good running shape assembled?
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post #8 of 14 (permalink) Old Feb 7th, 07, 7:04 PM
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Re: BBC Heads HELP - Casting# 3993820

The set I have I took off of a 71 Corvette LS-5.
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post #9 of 14 (permalink) Old Feb 12th, 07, 12:35 AM Thread Starter
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Matt
 
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Re: BBC Heads HELP - Casting# 3993820

Quote:
Originally Posted by Mike Feudo View Post
The set I have I took off of a 71 Corvette LS-5.
ANY ideas what they are worth?
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post #10 of 14 (permalink) Old Feb 12th, 07, 3:24 PM
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Re: BBC Heads HELP - Casting# 3993820

I paid $100.00 for mine.

Dave
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post #11 of 14 (permalink) Old Feb 12th, 07, 5:09 PM Thread Starter
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Matt
 
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Re: BBC Heads HELP - Casting# 3993820

Quote:
Originally Posted by David_Bates View Post
I paid $100.00 for mine.
Were they ready to run or were they bare unassembled?
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post #12 of 14 (permalink) Old Feb 12th, 07, 8:43 PM
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Re: BBC Heads HELP - Casting# 3993820

They were complete but I had them pocket ported for 2.19"/1.88" valves, new guides, springs, retainers, etc. All together I have $800.00 in them.

Dave
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post #13 of 14 (permalink) Old Feb 12th, 07, 8:53 PM
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Re: BBC Heads HELP - Casting# 3993820

Krazybones, please post your what's it worth question in the "What's it Worth" section

Tom
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post #14 of 14 (permalink) Old Feb 12th, 07, 10:30 PM
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Frank Riley
 
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Re: BBC Heads HELP - Casting# 3993820

1) All 70-74 Corvette 454 cid engines were two bolt main configuration EXCEPT 1971 LS-6;
2) Most, if not all, 70-72 Corvette 454 cid engines used a forged steel crankshaft. There may have been some exceptions, though, with those using a cast nodular iron crankshaft;
3) All 73-74 Corvette 454 cid engines used a cast nodular iron crankshaft;
4) All 70-74 Corvettes with 454 cid engines, except 71 LS-6, used the same size intake and exhaust valves which, as I recall, were 2.06" intake and 1.72" exhaust.
5) 1970 LS-5 cylinder heads were unique to that year. For 1971-72 LS-5 engines, although different castings were used for each year, the cylinder heads were, essentially, the same. 1973 and 1974 LS-4 engines used cylinder heads specific to each year which were different for each year. As I recall, all 1970-72 LS-5 engines used cylinder heads which had about the same intake and exhaust port volumes. 73-74 LS-4 cylinder heads had smaller intake and exhaust ports, although I believe that 73 and 74 were about the same. All cylinder heads, except 71 LS-6, were cast iron material. 70-72 cylinder heads did not use induction hardened exhaust valve seats, including the valve seat inserts used on 71 LS-6 aluminum heads. 73-74 LS-4 cylinder heads used induction hardened exhaust valve seats;
6) All 70-72 LS-5 engines used the same camshaft, GM #3883986, which was also used on 66-69 L-36 427 engines. 1973 and 1974 LS-4 engines used a different camshaft, GM #353040, which was the same for both years. This camshaft was an "emissions profile" camshaft;
7) All 70-74 454 LS-4 and LS-5 engines used the same connecting rods which were forged steel with 3/8", knurled shank rod bolts;
8) All 70-74 LS-4 and LS-5 engines used cast aluminum pistons. The piston dome configuration was unique to each specific year, however, even though compression ratios may have been the same (72-74). 1970 LS-5 used 10.25:1 compression ratio; 1971 LS-5 used 8.5:1 compression ratio; 1972 LS-5 used 8.25:1 compression ratio; 1973-74 LS-4 used 8.25:1 compression ratio.
9) All 1970-74 Corvettes with 454 cid engine used the same oil pan, including LS-6;
10) 70-72 LS-5 engines used unique-to-each-year cast iron intake manifolds. However, all of the manifolds were similar. 73-74 LS-4 intake manifolds were also cast iron but had smaller port size to match the 73-74 cylinder heads. 73-74 manifolds also incorporated provisions for EGR.
11) All 70-74 Corvettes with 454 cid engines used the same side-specific exhaust manifold castings. 1971 with LS-6 and all 73-74 LS-4 manifolds were drilled and tapped for A.I.R. fittings.
12) All 70-74 Corvettes with 454 used the same valve springs except the 73-74 exhaust valve springs which were shorter to accommodate the rotators used during those years.
13) All 70-74 Corvettes with LS-5/LS-4 engines and manual transmissions used a 14" cast nodular iron flywheel with an 11" clutch. LS-6 used a 14" flywheel with a special dual disc clutch;
14) All 70-74 Corvettes with LS-5/LS-4 used the same oil pump
15) 1970-72 with LS-5 used the CCS (controlled combustion system) exhaust emissions control system. All 1971 LS-6 and all 73-74 LS-4 used the AIR (air injection reactor system) exhaust emissions control system. Many of the horsepower/performance differences, particularly during the 72-74 period, were the result of emissions control system differences.

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