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#11
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which octane do I use?
goodnigh wrote:
>>>> I am not sure what version of the 351C engine you have since the 351C >>>> was not offered from the factory in the 1969 Mustang model year. >>> My book says the 290/300 HP 351 was offered as an option in '69. >>> That has to be a Cleveland. >> FYI: 8-cylinder engines available for the 1969 Mustang are as follows: >> >> 302 2V F-code >> Boss 302 4V G-code >> 351W 2V H-code >> 351W 4V M-code >> 428 4V CJ Q-code >> 428 4V CJ Ram Air R-code >> 390 4V S-code >> Boss 429 4V Z-code >> >> Production of the 351C began with the 1970 model year and ended with the >> 1974 model year. >> >> More information on the Ford 335 series engines (including the 351C) is @ >> http://www.answers.com/topic/ford-335-engine >> >> Yet another $.02 worth from a proud owner of a 1970 Mach 1 351C 4V M-code >> @ >> http://community.webshots.com/album/18644819fHAehGJAjt >> > > So the M code is simply a 351 4V. Could be Cleveland or Windsor. > Then the only way to tell is to glance at the engine since there > are obvious physical differences between the two. > My '71 is an M code and is clearly a Cleveland. > > mike > > > The '69 M-code is definitely a Windsor. The '70-'71 M-code is a Cleveland. I didn't think of this on the first read-through. Whoops. The compression ratio for the 1969 2v H-code 351W is 9.5:1, and the 4v M-code is 10.7:1. I'd use premium gas in the M and maybe mid-grade in the H, listening for ping, and keeping in mind the advance curve. The Cleveland's block is obviously visually bigger, although its deck height is a smidgen shorter than the Windsor's. There are five versions of the Cleveland, in all, but you'll only commonly see two. I've only seen a few Boss 351s and one 351CJ. There was also a 302 Cleveland, but it was only produced in Australia. -- Jason O |
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#12
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which octane do I use?
Jason O wrote:
> goodnigh wrote: >>>>> I am not sure what version of the 351C engine you have since the >>>>> 351C was not offered from the factory in the 1969 Mustang model year. >>>> My book says the 290/300 HP 351 was offered as an option in '69. >>>> That has to be a Cleveland. >>> FYI: 8-cylinder engines available for the 1969 Mustang are as follows: >>> >>> 302 2V F-code >>> Boss 302 4V G-code >>> 351W 2V H-code >>> 351W 4V M-code >>> 428 4V CJ Q-code >>> 428 4V CJ Ram Air R-code >>> 390 4V S-code >>> Boss 429 4V Z-code >>> >>> Production of the 351C began with the 1970 model year and ended with >>> the 1974 model year. >>> >>> More information on the Ford 335 series engines (including the 351C) >>> is @ http://www.answers.com/topic/ford-335-engine >>> >>> Yet another $.02 worth from a proud owner of a 1970 Mach 1 351C 4V >>> M-code @ >>> http://community.webshots.com/album/18644819fHAehGJAjt >>> >> >> So the M code is simply a 351 4V. Could be Cleveland or Windsor. >> Then the only way to tell is to glance at the engine since there >> are obvious physical differences between the two. >> My '71 is an M code and is clearly a Cleveland. >> >> mike >> >> >> > > The '69 M-code is definitely a Windsor. The '70-'71 M-code is a > Cleveland. I didn't think of this on the first read-through. Whoops. > > The compression ratio for the 1969 2v H-code 351W is 9.5:1, and the 4v > M-code is 10.7:1. I'd use premium gas in the M and maybe mid-grade in > the H, listening for ping, and keeping in mind the advance curve. The > Cleveland's block is obviously visually bigger, although its deck height > is a smidgen shorter than the Windsor's. There are five versions of the To clarify - 351 - five versions of this, in addition to the aussie 302C. > Cleveland, in all, but you'll only commonly see two. I've only seen a > few Boss 351s and one 351CJ. > > There was also a 302 Cleveland, but it was only produced in Australia. > -- Jason |
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