Guest Holiday88 Posted February 10, 2013 Share Posted February 10, 2013 Body & paint done, Next comes seats then change engine, save the orginal and find a nice 403 yes or no? Link to comment Share on other sites More sharing options...
rocketraider Posted February 10, 2013 Share Posted February 10, 2013 A 350 may be easier to find than a 403, simply because it was produced longer (1968-80). I think you will find either a great improvement over the 307 and the untrained eye will never know the difference. Both engines respond fairly well to the CCC system too, and if you keep all its components you might be surprised at what kind of gas mileage they can get once the system learns the new engine. Link to comment Share on other sites More sharing options...
joe_padavano Posted February 10, 2013 Share Posted February 10, 2013 Actually, 403s are easier to find than you think. I've collected three and turned down several more. Look in 77-79 Trans Ams. I think Pontiac installed more Olds 403s than Olds did. Link to comment Share on other sites More sharing options...
Guest BJM Posted February 12, 2013 Share Posted February 12, 2013 I like the 403's too. Had one in a Trans Am and one in a 77 Olds 98. Joe P, correct me if I am wrong but I think Mondello's supports the 403 (and the 350) with internal hp parts and stock parts. I thought a 403 was an Olds 350 bored and stroked but I may be wrong. Link to comment Share on other sites More sharing options...
joe_padavano Posted February 12, 2013 Share Posted February 12, 2013 I like the 403's too. Had one in a Trans Am and one in a 77 Olds 98. Joe P, correct me if I am wrong but I think Mondello's supports the 403 (and the 350) with internal hp parts and stock parts. I thought a 403 was an Olds 350 bored and stroked but I may be wrong.The 403 is an Old small block with the same architecture as all other Olds small blocks. The only difference between an Olds 350 and an Olds 403 is the bore (4.057" vs. 4.351"). All Olds small blocks, from the boat anchor 260 to the 403, use the same 3.385" stroke. The 403 uses a unique block with siamesed cylinders (just like the Chevy 400 block) to make room for the larger bore diameter within the same bore spacing architecture. Interesting trivia point is that the 403 has the largest bore of any Olds motor ever made. The 455 only has a 4.125" bore. Link to comment Share on other sites More sharing options...
bhambulldog Posted February 13, 2013 Share Posted February 13, 2013 Actually, 403s are easier to find than you think. I've collected three and turned down several more. Look in 77-79 Trans Ams. I think Pontiac installed more Olds 403s than Olds did.Some Buicks 77-79 had Olds 403 as well Link to comment Share on other sites More sharing options...
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