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12-17-2011, 05:32 AM
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small block rebuild?
Started tearing down the sb in the malibu. Motor has manley 5604p pistons that are 60 over. roller rockers.....heads are 3917291.......crank is 3932442....block is 3970014. My question is would this motor be a good motor to just rebuild? How many cubic inches is this motor now (assuming stock lenth rods). Can I id the cam if i take the front timing cover off? Motor has double roller chain. Car ran with 850 holley and I have time slips of low 12s. Thanks for any help...
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12-17-2011, 07:42 AM
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If it`s already .060 you`ll need to have the bores checked to see if it can take a hone and be rerun as .060 is as far over as most go. THey do make .080 over pistons for 350`s now, but I would have it sonic checked before I tryed my luck on .080 over. Rod lenth doesn`t change the stroke.
a 350 .060 over is 361 cubic inches. If you remove the timing cover you might be able to ID the cam and you might not as some are marked and others aren`t. Does the engine show signs it needs a rebuild such as excessive blow by or oil usuage? If it doesn`t need it why build it?
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12-17-2011, 09:45 AM
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350
Thanks for your reply. Engine did smoke but both head gaskets where blown apart between #3 and #5 as well as between #4 and #6. compresson test had 125 at 1,2,7,8, cylinders. 3 and 5 read 0. 4 and 6 read 60. I can I guess have new valve guides installed and put engine back?
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12-17-2011, 10:34 AM
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You also need to find out why the head gaskets gave up. It's pretty seldom that both sides quit unless something bad was going on that usually involves heat. I would at least check the block with a straight edge and have a clean up cut done on those heads. If you know it got seriously hot, I would also consider brush honing the bores and putting new rings/rod bearings in it. That's if the bores aren't too far out.
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12-18-2011, 10:52 AM
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sbc
Thanks for the info. I called my local speed shop/rebuilders and spoke to him. Im taking engine after the holidays and have it done/checked. Dont like the 60 over thing but I will see if block is still good and go from there. Thanks again for your help....
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