: 396 engine and head decode
richr Jan 22nd, 04, 1:59 PM I have a friend who picked up a 396 - not sure what it's from or what the details about it - here are the numbers
Head - 3933148 casting number
block castin ends in 272 - pad number shows TO324JQ
The pistons are domed not flat - look like 10:1
Any info would be great as to what it is and where it came from.
Rich
David Bates Jan 22nd, 04, 2:18 PM T0324JQ - 1969 Chevrolet 396/265 HP built march 24th 1969.
3933148 - Oval port, open chamber (122.1 cc), 1969 427/265hp 2BBL carb engine.
d1_bradley Jan 22nd, 04, 2:21 PM 1969 JQ Chevrolet 396 265HP TH (Impala)
'69 396/265hp, 366T, 427T,heads
richr Jan 22nd, 04, 2:24 PM Thks Guys,
According to the information he recvd from the owner it was out of a police car, guess being an Impala it could be possible.
Are those heads worth toying with, considering the chamber size or should he replace the heads with a better set.
Thks
Rich
d1_bradley Jan 22nd, 04, 2:59 PM A "JO" code would be police, still 265 horse. Sure its JQ?
richr Jan 22nd, 04, 3:07 PM Definately JQ - i have a pic he sent and it's clear - what do guys think about using the heads - worth using?
Thks
Rich
vr1967 Jan 22nd, 04, 3:20 PM Rich,
I would get rid of the original 2 bbl intake (if still there) and rebuild it. (Yes, I said 2 bbl! The only BBC that had one!) It has 2 bolt mains, cast crank, and 9.5 to 1 compression.
Would make a nice pump gas street engine with a better cam and induction system.
Virgil
richr Jan 22nd, 04, 3:26 PM Virgil,
He's definately rebuilding and going with an better cam and maniflod carb set up. So the heads are ok I assume - just concerend on sinking money into the heads if they are not worth it. I would think a little bit bigger on the valves and some pocket porting would also enhance the performance on those heads, but then the dollars add up there.
Thks
Rich
vr1967 Jan 22nd, 04, 4:35 PM Rich,
I would have him check the CC's of the heads, as I think they are closer to 112cc instead of 122cc. Most heads of 69 were 100cc closed chambers and these are a semi open chamber,if I'm not mistaken.
I rebuilt one of these engines about 10 years ago for a friend, and it is still going strong. 2bbl and all.
If the friend is just doing a mild street build up, I would gasket match maybe, and if he goes to hardened seats, change to the bigger valves. Seat prices are the same. (Or at my machine shop anyways!)
Virgil
richr Jan 23rd, 04, 7:30 AM Virgil,
Thks - will pass on the advice.
Thks
Rich
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