The 1958 350-cid V8 engine was a B block engine, not RB. Stroke on the 350 was 3.375", same as the B block 361 and B block 383. 1958 was the first year for the B block (350 and 361) with the B block 383 appearing for 1959. The RB engine was introduced for 1959, replacing the 354/392 block, and was available only in Chryslers and Imperials. The RB block 383 was used only in American-built 1959-60 Chrysler Windsors and Saratogas while the 413 was used in the Chrysler New Yorker, 300-E/F and all Imperials. Stroke on the RB was 3.75". And contrary to what some "experts" claim, DeSoto NEVER offered an engine based on the RB block. It was strictly a Chrysler/Imperial engine in 1959-60. Due to the small bore on the RB 383 (4.03") that engine used the heads from the 361 engine while the B 383 (4.25" bore) shared heads with the 413. Which adds to the confusion. Bill Vancouver, BC . ----- Original Message ----- From: sosmi@xxxxxxxxxxx To: mailing-list@xxxxxxxxxxxxxxxx Sent: Monday, March 19, 2007 9:00 AM Subject: Re: IML: High output Starter For 60imp 383 Don't forget, there was also a 350 RB 57-58 motor too, I believe the B motor started in 59.361-383, kinda fuzzy,as many of my references are gone thanks to Hurricane Jean. Dave -------------- Original message -------------- From: "Frederick Joslin" <fljoslin@xxxxxxxx> The 413 is an RB engine while most 383 were B engines. Very early on there was a RB 383. Other than the greater deck height (height from the crank to the head) the RB engines are also wider where the intake manifold sits and so need a wider intake manifold. Measuring the width of the intake is probably the easiest way to determine if you have the B or RB engine. I do not know what the exact measurements are, but could find out. ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm