402 block numbers

**KNAPPY** · #1 04-26-2004, 02:24 AM

I bought a 68 Chevelle SS 396 a few years back and someone had put a 402 in block #3999209 in it. The engine pad has XXW stamped on it. Is this a truck block? Anyone know what this came out of?

JChlupsa · #2 04-26-2004, 02:30 AM

is the 3999209 # right??

I only find

3999290....396.......68-69...2 or 4 bolt, Truck
3999290....402.......70-72...2 or 4 bolt, Truck
3999290....402.......72......2 or 4 bolt, Passenger

**KNAPPY** · #3 04-26-2004, 02:59 AM

Sorry its 3999290, XXW on the pad

rpoz11 · #4 04-26-2004, 04:22 AM

The 402 in my 1972 C30 Longhorn shows this on the front deck: T1I09TKX...Hope that helps

**KNAPPY** · #5 04-26-2004, 08:55 AM

This Chevelle has the Buick interior that was installed from the factory because of a strike at GM in 68-69. This motor does not match the POP I have with the car. Just wondering if something weird was done with the motor. I think it replaced somewhere along the line.

**mssl72** · #6 04-26-2004, 11:22 AM

KNAPPY,
Jeff seems to have found it. According to Chevy by The Numbers it was used in 1972 on Passenger cars, Chevelle and Camaros. It's supposed to be a 402/240hp, 2 bolt main block according to the book, but he also states that there's a lot not known about this block. I looked for the XXW code and couldn't find it in the book. Maybe it's originally from a truck. Chevy By the Numbers doesn't say a whole lot about trucks.

**KNAPPY** · #7 04-26-2004, 10:07 PM

Its strange this block was used from 68 to 72. I can't see the block date codes but I suspect it is a 72 block but the intake is a 69 date code. The POP said it is suppose to be a 325 hp ET code motor. Thanks for the info. Now I have to find who makes the repo seat covers for the Buick interior that came in this car. Any ideas??

**Mr70** · #8 04-27-2004, 12:08 AM

Check on Team Chevelle.I thought someone said they found a company who reproduces this Buick interior.But I may be mistaken.It was awhile ago.

There is a 4Spd Black Cherry 1970 L78 Chevelle over here that has the #290 block in it.It is a CE engine,and is dated 1972.The owner claims he bought it with that engine in it in 1978.He called the early owners and realized it was put in the car in 1972,as a Warranty engine.His is a #290 two bolt,to replace the original 4 bolt L78.
I have never seen this block as a 4 bolt block,Have any of you?

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