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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 04/08/13 11:44 AM

I recently purchased a bbc chevy which i  know nothing about so here i am hoping you guy can help me  here are the numbers . The number on the head is 6272990 also stamped Hi Perf, the number on the block is 3999289 the block is a 4 bolt main and last the pistons have this number on them and they are domed 3963550 with a GM stamp above it their is also a stamp in the center of the piston dead center which i cant make out  the stamp date on the block is 1-25-73. I am hoping to learn what kind of power this engine made and what it came out of and is it worth the 200.00 i paid for it. Thanks in advance guys.  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 04/08/13 02:41 PM

3999289 454 72-78 Car & Truck 2-Bolt

6272990 454 71-94 2.19/1.88 118cc Replacement Rectangular port 325cc intake

This is all I have. I'd say you got a good deal. The Hi Perf stamping indicates a car block.  
68scott385 68scott385 68scott385

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 04/08/13 03:09 PM

200 is a very good deal even if it needs a rebuild.
If it came with those heads it is a great deal.
You could expect 500hp out of that motor without to much trouble and if you install a roller cam, rockers, good intake and carb with headers you could get 600hp without to much trouble.  
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]

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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 04/08/13 04:17 PM

Thanks alot scott im not complaining some is more than non and i had absolutely nothing far as info on the setup thanks again  

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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 04/08/13 04:23 PM

Thanks alot scott im not complaining some is more than non and i had absolutely nothing far as info on the setup thanks again  

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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 04/08/13 04:28 PM

Thanks for the info dave and i think i will take ur advice.  

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 04/09/13 04:30 AM

Those engines are the backbone of drag racing along with the SB Chevy. They are well built and perform well for the dollars spent.
I ran that type engine for many years and when I stepped up it was to a BB Chevy type design, such as a big M or Keith Black aluminum.  
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]

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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 04/09/13 04:36 AM

How much hp/torque can this motor safely make on the original setup before it becomes a tiching time bomb meaning if i just had it rebuilt same crank,new but same style piston, and a bigger cam. Thanks  

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Dave632
I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 04/09/13 10:49 AM

The last year they put this motor in a production car it was rated at 450hp. That was with a performance cam, 850 cfm single 4, and 11-1 compression. I think it actually made closer to 500 hp stock. This is what you could expect from your motor if all goes well. Those cars when run at the strip and track prepared ran in the 11s. Stock they could run in the low 13s high 12s with some tires.  
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]

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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 04/09/13 04:25 PM

Just what i was looking for thanks dave......;-)  

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 04/09/13 07:05 PM

Mr Florida:

I agree with Dave 632 on the engine. The easiest way to tell if it's really a HiPo block is this. Above the oil filter there will be a (2) pipe plugs. They will be marked IN-OUT. Those plugs can be removed and you can install a oil Cooler. Those are the 375/396 and some were 402s. I ran one for nearly 35 years without breaking it. It should have a cross drilled crank, dimple rods 3/8 rod bolts. Mine had rectangular port heads. You have a great engine for $200 bucks. Rebuild it and if I can make one suggestion have a real good balance job done. Not just weight match the parts. You want a rotating balance. Good Luck

Bob  

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 04/09/13 07:05 PM

Mr Florida:

I agree with Dave 632 on the engine. The easiest way to tell if it's really a HiPo block is this. Above the oil filter there will be a (2) pipe plugs. They will be marked IN-OUT. Those plugs can be removed and you can install a oil Cooler. Those are the 375/396 and some were 402s. I ran one for nearly 35 years without breaking it. It should have a cross drilled crank, dimple rods 3/8 rod bolts. Mine had rectangular port heads. You have a great engine for $200 bucks. Rebuild it and if I can make one suggestion have a real good balance job done. Not just weight match the parts. You want a rotating balance. Good Luck

Bob  

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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 04/10/13 06:07 PM

Thanks alot pepsi1  (Bob) their is a plug above the oil filter after reading your post that this is a good thing  and for future refrence suggestions are always welcome buddy thanks  

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MrFlorida
I love my Chevy Chevette!
Posts: 15
Joined: 04/13
Posted: 05/02/13 03:23 PM

What is a good roller rocker to run on the 990 oval port heads  

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dond1965
I have an SS396 tatoo
Posts: 294
Joined: 12/13
Posted: 12/04/13 07:07 PM

you cant beat the paired shaft type on the big block chevy! t-n-d and jesel are 2 sources..... good luck to ya  

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