Whats my 454 Merc???
#11
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Correct I got the serial number off plastic cover on carb. Its not MPI I know that. The serial number can go both ways with Mag or non-mag. The cover only says 7.4/Bravo Thunderbolt ign. on it
#12
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If I pull off value cover and get case # of head does anyone know what heads are the rectangle port # and what one is the peanut port case #'s. I also read that in the Gen VI that they also put on that Gen. that are not rec. or peanut, but a larger intake ports then peanut but not as big as rec. they make it so confusing.
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Something seems funny with the carb to me. Could be that the whole engine has been modified or replaced? You cannot rely on the carb cover IMO. And I am not sure the block casting number is going to help (I thought the block was the same and the internals with the internals - cast vs forged where the difference?). If you get a shot of the intake for these guys they will be able to tell you of it is a rectangle port intake from looking at it.
#17
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Where did you see that? The serial number only pertains to one engine. Every place I check the number it comes up as 7.4L Bravo. As bus said the mag was never labeled as a 7.4. Here's some specs comparing them.
http://www.perfprotech.com/blog/arti...specifications
Accordind to this the 7.4L should have a cast iron intake manifold and the mag has an aluminum one. Take a magnet out and check it.
Type your number in here and see what comes up.
http://www.perfprotech.com/mercruise...r/searchserial
http://www.perfprotech.com/blog/arti...specifications
Accordind to this the 7.4L should have a cast iron intake manifold and the mag has an aluminum one. Take a magnet out and check it.
Type your number in here and see what comes up.
http://www.perfprotech.com/mercruise...r/searchserial
Last edited by picklenjim; 01-14-2013 at 06:39 PM.
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What is unusual about the carb?
Number comes up as a 1997 7.4L carb engine.