auto or marine / difference???

ctrain22 · April 25th, 2009, 06:09 PM

Is there a difference between an auto 455 and a marine 455? Is the boat application different? If so, which is better????

citcapp · April 25th, 2009, 07:33 PM

No difference engine wise, some of the marine engines came with Ka heads which are very good heads and they also came with 4-speed flywheels and the cranks were usually drilled for for 4-speed transmissions. If it is currently in a boat you will most likley have to change the oil pan and maybe add a water pump dependiing on how it was cooled.

Lady72nRob71 · April 25th, 2009, 11:16 PM

Same carbs also?? I recently got a 7042250 carb that had the hit idle compensator removed and lead shot put in its place... I thought maybe it was from a martaine or special epplication...

redoldsman · April 26th, 2009, 09:19 AM

Marine carbs are always modified to prevent any fuel from spilling out onto the intake manifold. This includes modifying the throttle shafts and changing the j-tubes on Holley's. Distributors, alternators and starters are also different to prevent sparks in the engine bay.

April 25th, 2009, 06:09 PM	#1 (permalink)
ctrain22 Registered User Join Date: Oct 2008 Location: Ventura, CA Posts: 141	auto or marine / difference??? Is there a difference between an auto 455 and a marine 455? Is the boat application different? If so, which is better????

April 25th, 2009, 07:33 PM	#2 (permalink)
citcapp Super Moderator Join Date: Nov 2007 Location: Bothell, WA Posts: 3,455	No difference engine wise, some of the marine engines came with Ka heads which are very good heads and they also came with 4-speed flywheels and the cranks were usually drilled for for 4-speed transmissions. If it is currently in a boat you will most likley have to change the oil pan and maybe add a water pump dependiing on how it was cooled. __________________ Pat 1957 Super 88 with a 455 1948 2dr series 76 with a 455

April 25th, 2009, 11:16 PM	#3 (permalink)
Lady72nRob71 Moderator Join Date: Feb 2008 Location: Plano, TX Posts: 1,916	Same carbs also?? I recently got a 7042250 carb that had the hit idle compensator removed and lead shot put in its place... I thought maybe it was from a martaine or special epplication... __________________ -Rob Young 1972 Cutlass Supreme Convertible (442 clone) -"Lady" (My mistress...) http://www.flickr.com/photos/robsalbum/sets/ 1986 Cutlass Supreme Coupe - "Pristine" 1978 Ford (Old Faithful) a.k.a. "the Tramp" 1997 Cadillac STS (for sale - too many cars!) 1999 Harley Davidson Sportster - "the Freedom Machine"

April 26th, 2009, 09:19 AM	#4 (permalink)
redoldsman Proud Viet Nam Veteran Join Date: Dec 2006 Location: Rowlett, TX Posts: 481	Marine carbs are always modified to prevent any fuel from spilling out onto the intake manifold. This includes modifying the throttle shafts and changing the j-tubes on Holley's. Distributors, alternators and starters are also different to prevent sparks in the engine bay. __________________ redoldsman

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