3969854 Hi perf??? What is it? - Chevelle Tech
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  #1  
Old Aug 15th, 07, 7:21 PM
tomy2tone01 tomy2tone01 is offline
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Default 3969854 Hi perf??? What is it?

My engine says 3969854 Hi perf. A-29-70

Is this a 396 or a 402?

Also heads 3931063 what are they?
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Old Aug 15th, 07, 7:28 PM
d1_bradley d1_bradley is offline
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Default Re: 3969854 Hi perf??? What is it?

3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber
3969854....396.......69......2 or 4 bolt
3969854....402.......70-72...2 or 4 bolt

The "pad" number, pass side front will get you an answer. I'm guessing by date of casting its a '70 402 325 HP.
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Old Aug 18th, 07, 6:56 PM
Junkyard Dawg Junkyard Dawg is offline
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Default Re: 3969854 Hi perf??? What is it?

I thought they quit making the 325 hp version in 70? It gained an extra 5 hp?

A-29 is Jan 29, check for the 3 digit alphabetical code on the front pad forward of right cylinder head.
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Old Aug 19th, 07, 7:42 PM
Dean Dean is offline
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Default Re: 3969854 Hi perf??? What is it?

Quote:
Originally Posted by Junkyard Dawg View Post
I thought they quit making the 325 hp version in 70? It gained an extra 5 hp?
Where did you see "325 hp" ?
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  #5  
Old Aug 19th, 07, 8:22 PM
d1_bradley d1_bradley is offline
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Default Re: 3969854 Hi perf??? What is it?

I had 325HP in my response. 325 / 330, what I meant was the LOW HP version. The most common one. Actually I didn't even know that they gave a '70 another 5HP. Still the same 'entry level' big block engine.
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Old Aug 19th, 07, 9:31 PM
Junkyard Dawg Junkyard Dawg is offline
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Default Re: 3969854 Hi perf??? What is it?

Yeah in 1970 The 396 came as a 330 hp version, a 350 hp and a 370 hp version.

Also even though they all had the same bore and stroke they called the 330 hp version the 402, the other two they still called the 396.
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Old Aug 20th, 07, 11:05 AM
DaleM DaleM is offline
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Default Re: 3969854 Hi perf??? What is it?

The LS3 330hp wasn't used in the SS but was available in the Malibu although the GM Restoration Kit doesn't show it. A gentleman sometime back had photos of a 70 Malibu convertible with the LS3 option. No chrome dressup kit on the engine and front fenders had '400' emblems. Pretty car!
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Old Jan 21st, 13, 3:57 AM
robpenny45 robpenny45 is offline
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Default Re: 3969854 Hi perf??? What is it?

Is there a site to confirm how many 3969854 were produced and or by year?
Here is some info on the block Date code B-3-70 Suffix code CKO.
Different sites say as follows:
3969854 1969-72 396/402 240, 265, 300, 325, 330, 350, 375,
CKO 1970 396 375 Chevelle L-78 SHP
CKO 1970 396 375 Camaro L-78 SHP
CKO 1970 396 375 Nova L-78 SHP
L78 396/402 375@5,600 415@3,600 Camaro/Chevelle/ Nova
3969854....396.......69......2 or 4 bolt
3969854....402.......70-72...2 or 4 bolt
3969854402360 and 3751972Two-bolt3969854454360 and 3751972Two-bolt
3969854 1969 (late)
1970
1971
1972 396
402
402
402 325(4), 350(4), 375
330(4), 350(4), 375
300
240
Used in all 402 applications. Block has 'short tower' distributor boss and casting date is found on top of bellhousing flange near casting number.
Tips & Warnings
If the engine identification numbers read 3969854 or 3955272, the engine is considered a 396/402.


Read more: How to Identify a 396 Big Block | eHow.com http://www.ehow.com/how_7379638_identify-396-big-block.html#ixzz2IZMaKWAq
3969854 402 68-72 Pass, Chevelle, Camaro 4 BC, 2 & 4 Bolt Main
3969854 402 70 Nova 2 & 4 Bolt Main
3969854 400, 402 70-72 Truck 2 & 4 Bolt Main
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