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Old 09-29-2013, 03:57 PM
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396 build up

I was thinking about buying a big block 402 and I saw one on Craigslist for 3k fully rebuilt with a bunch new parts he said he hasn't dynoed it but it should make 460 horsepower I was wondering is this a good buy for the price and is the horsepower numbers in the right spot for what it has in it here's the link as well
402 BB chevy ($3000 O.B.O)
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Old 09-29-2013, 04:12 PM
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Domed pistons...That tells you nothing, all the big blocks back then had domed pistons.

What heads?....That makes all the difference right there
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Old 09-29-2013, 04:21 PM
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Well when I talked to him he said the pistons were stock but they were brand new and the heads are the original ones off the 1969 block casting number 3965198
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Old 09-29-2013, 04:45 PM
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Quote:
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the heads are the original ones off the 1969 block casting number 3965198
Closed chamber, oval port, truck heads. I wouldn't expect too much from them. I also wouldn't expect too much from a flat tappet cam in a BBC.
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Old 09-29-2013, 04:58 PM
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make an offer based on taking the engine apart.It is what it is and makes what ever power.If its new,not a bad deal
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Old 09-29-2013, 05:09 PM
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make an offer based on taking the engine apart.It is what it is and makes what ever power.If its new,not a bad deal
he has it ready to run, Have you heard it run? like vinniekq2 said buy it as parts. a red flag to me is it needs new wires. is it running like crap? could mean it is just a dolled up motor on a stand that has issues.
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Old 09-29-2013, 05:37 PM
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I have seen a video of it running and it sounds really good tho the video is on my phone amd i dont know how to post it on here and he says it needs new wires because the fire from the exhaust is burning the wires
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Old 09-29-2013, 05:43 PM
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" could mean it is just a dolled up motor on a stand that has issues."

My exact thoughts.
I have bought literally hundreds of engines.
Most of the parts listed are stock GM stuff.
With a used set of covers and an aftermkt intake...Beware.. As stated all 396-402 used a dome piston and the truck heads don't support the claimed horsepower.
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Old 09-29-2013, 05:56 PM
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I would @ the very least ask for parts reciepts & a copy of the shop invoice for the stated machine work.Then you could @ the very least call up the shop & ask them about the work performed.If he can't produce any of that or @ least the shop # & contact,I think I would pass on it.If it is indeed a fresh engine,I'd say it's a good deal.
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Old 09-29-2013, 06:07 PM
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I have done that as well he has the receipts and documents to prove his statements and I called the machine shop owner and the work done on it is true as the receipts state and the machine shop states so the only thing I'm concerned with now is that I'm pretty sure the HP is not even near 460 I don't really need that much anyways i just at least want 400 to 450 you guys think it can be near those numbers then?
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Old 09-29-2013, 06:27 PM
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The 69 396,IIRC,was the lowest output 396 produced.In stock form,it rated for approx 275 HP.He's basically got a bored .030 396 with a cam swap.I can't see the cam & 4 bbl giving the engine an additional 125 HP.If I had to guess,I'd say it's prolly around 350 to 360 HP engine as is.
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Old 09-29-2013, 06:43 PM
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I'd say it's prolly around 350 to 360 HP engine as is.
I'd say that's a real good estimate.

If I bought it, the first thing I would do to it is replace the flat tappet cam with a roller. Flat tappet cams don't fare well in big block Chevys.
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Old 09-29-2013, 06:51 PM
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From what I've been told the engine was stock at 350 HP before being upgraded but what determines how much HP it had while stock because there were like 3 or 4 different 396s and btw thank you all for helping me out here since I'm too knowledgeable on this subject
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Old 09-29-2013, 07:20 PM
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That version of the 396 only had approx 9:1 CR.With the current cam & maybe even shorter pistons,it could be less.The "GOOD" 396's & 402's had a lil better than 11:1 & a decent flowing aluminum head.That's not a bad price for a fresh turnkey 396,provided it's a quality rebuild.If you could get it @ a lower price,all the better.A roller cam & a good set of heads would put you in a whole different ballgame.You could. Prolly sell the heads on EBay.That shortblock would be a really good foundation to build on.
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Old 09-29-2013, 07:21 PM
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The most plentiful 396 was the 325 hp. This had oval port heads, 10-1 compression. hyd cam and a Q-jet. The next up was the 350 hp. Only produced for a couple of years. Basic oval port with better hyd cam and a Holley 4 bbl.
The best was the 375 hp. Also rated at 425 in certain instances. Rectangle port heads, 11=1 compression, forged pistons, forged crank, solid lifter cam, aluminum intake (and heads on some) Holley 4bbl.
The least was the 396 2bbl. engine in 69. Low hp gas hog!
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