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Hello again everyone! I located an early 425 4bbl for sale, and have some questions about the casting numbers. I was ideally looking for a starfire engine or a 39° Toro 425. This one's block casting is 386525A and the heads read 383821. From online info, It seems to be a 1965 with 45°cba but I can't find any info about compression, etc. The head numbers seem to say they're from a 1965 400c.i. ?? Any info from you guys would be a great help! Thanks.
That is for sure a 65 A block 425 and the heads for that engine would also be A heads. Looks right to me and that would be a 45 degree cam bank engine.
That is for sure a 65 A block 425 and the heads for that engine would also be A heads. Looks right to me and that would be a 45 degree cam bank engine.
thanks. Do you think the heads are off a 400? And is it a high compression engine?
I agree with Oldsmaniac that the heads would also match what came on the 1965 425. To verify the original application remove the alternator and look for a stamp on the end of the passengerside head. That stamped code will key out what that head originally came in/on.
That is for sure a 65 A block 425 and the heads for that engine would also be A heads. Looks right to me and that would be a 45 degree cam bank engine.
Also, I'm not familiar with quadrajets earlier than my 1967...is that a qjet on there? It appears different
I agree with Oldsmaniac that the heads would also match what came on the 1965 425. To verify the original application remove the alternator and look for a stamp on the end of the passengerside head. That stamped code will key out what that head originally came in/on.
So like my 1967 330, there's a headstamp on front passenger head. What does the 383821 designate on the head there near the spark plug?
So like my 1967 330, there's a headstamp on front passenger head. What does the 383821 designate on the head there near the spark plug?
That's the casting number for the 1965 "A" head. These same castings were used on all 400 and 425 motors in the 1965 model year. They have the one-year-only 3/8" rocker studs instead of the more common 5/16" bolts. The carb is a Rochester 4GC, which was the standard GM four barrel until the Qjet came out in the 1966 model year. The 4GC will say QuadJet on the air horn casting, which is why it often gets confused for a QuadRAjet carb. The engine looks to be very original.
January 18th, 2018, 03:58 PM
