tortu15071 Posted January 17, 2018 Share Posted January 17, 2018 I have a 402 to drop in my 71. I am looking for some expertise here on what i have. The block casting is a 3999290 block pad near passenger side head reads CE250510. The heads are the rectangle ports with "hi performance" stamped in them with the casting of 3964291. Any help is appreciated. I am also considering selling this motor and keeping it a small block car if anyone is interested. Quote Link to comment Share on other sites More sharing options...
MC1of80 Posted January 17, 2018 Share Posted January 17, 2018 Hi. From what I can tell you have a service replacement block- ie the CE. The 2 is usually the year- 72. Is it a 4 bolt main? Some service replacements were. As for the heads they are closed chamber rectangle port heads. Same heads were used on the 70 LS6. A big port head for a small cube engine (the 402) Quote Link to comment Share on other sites More sharing options...
Paul Bell Posted January 18, 2018 Share Posted January 18, 2018 Casting number 3999290 was used for: 396, 68-69, 2 or 4 bolt, truck402, 70-72, 2 or 4 bolt, truck402, 70-72, 2 or 4 bolt, passenger Passenger meaning full size, Camaro/Nova & Chevelle/Monte Carlo. Quote Link to comment Share on other sites More sharing options...
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