huge motor ?
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From: toledo oh
huge motor ?
i have two options: rebuild my 400-which has been bored over already and crank turned, so id have to do that all again which means it probably has a lot of miles on it. OR i buy a used motor(recently rebuilt)
MY ? IS how big of a deal is it to put a 1990 351 in my 78 f150? its fuel injected and has a comp. and a different kind of fuel pump... HELP ME
MY ? IS how big of a deal is it to put a 1990 351 in my 78 f150? its fuel injected and has a comp. and a different kind of fuel pump... HELP ME
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From: toledo oh
well...i did wanto rebuild my 400, with a different cam and new timing gears and chain and headers with holley 4bbl but im not sure on what to do now. with the block bored over already and the crank--do i need to bore it again? or let that go? i know for sure i need to turn the crank tho, the bearings were let go too long i think.
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that all depends....
how much was it bored over, and how much was the crank turned? the efi 351 swap would be difficult, but not impossible if you have all the parts to donate, and patience.
Then you have the option of sleeving the bores back to stock(at about $80/sleeve PLUS LABOR), and replacing the crank. should it have been turned more than 0.030" under. (bearings would be difficult to find after this point....your best choice would be to build a solid junkyard motor (or a trash can motor built with donor parts), swap it in and tear down the original to examine and measure the original to see how much is salvageable. You'll be surprised how these engines don't wear if they've been faithfully serviced.
Then you have the option of sleeving the bores back to stock(at about $80/sleeve PLUS LABOR), and replacing the crank. should it have been turned more than 0.030" under. (bearings would be difficult to find after this point....your best choice would be to build a solid junkyard motor (or a trash can motor built with donor parts), swap it in and tear down the original to examine and measure the original to see how much is salvageable. You'll be surprised how these engines don't wear if they've been faithfully serviced.
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From: toledo oh
the cylinders were bored .020 and the crank was taken down .010. so you think i should just go yank a motor and rebuild that one instead?
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that all depends....cont.
these engines can be bored up to 0.040" over for a non-performance engine(daily driver) 0.030" is safe for performance. the crank can be turned down alot more, but you'll run into a hurdle finding bearings that will fit over 0.030" under sized. rebuilding your existing block will depend on wear on the cylinder bores and how much it will take to clean it up...another overbore (within limits) should work fine. as for the crank, dirt in the oil can create deep gouges that another 0.010" under wont clean up. a good experienced machinist can look at a bare block and crank and tell you how much it will take to 'renew' your engine. doing your own assembly can save a bunch on a new motor. inspect, measure, pay attention to details, and use resources like manuals and FTE.
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