Yrdnal 0 Report post Posted July 11, 2019 My car 1969 351W M code automatic came with a non-stock 4300 (off a full size ford I believe, choke tube was wrong for a Mustang), the throttle shafts are kinda worn anyway so I got a replacement core Mustang 4300 C9ZF-D to replace it. Does any one know what size jets this Mustang carb came with "stock" for normal sea level applications? My old carb has jets "10" sizes larger than this core came with. My old carb may be a larger cfm 4300(?), so just trying to get close the first time... Thanks in advance Quote Share this post Link to post Share on other sites
thrice 11 Report post Posted July 13, 2019 This is what the 1969 Service Specs manual says... Quote Share this post Link to post Share on other sites
Yrdnal 0 Report post Posted July 13, 2019 That’s exactly what I was looking for... Thank you thrice! Quote Share this post Link to post Share on other sites
thrice 11 Report post Posted July 13, 2019 You're welcome! Quote Share this post Link to post Share on other sites
Rich Ackermann 174 Report post Posted July 16, 2019 On 7/11/2019 at 6:17 PM, Yrdnal said: My car 1969 351W M code automatic came with a non-stock 4300 (off a full size ford I believe, choke tube was wrong for a Mustang), the throttle shafts are kinda worn anyway so I got a replacement core Mustang 4300 C9ZF-D to replace it. Does any one know what size jets this Mustang carb came with "stock" for normal sea level applications? My old carb has jets "10" sizes larger than this core came with. My old carb may be a larger cfm 4300(?), so just trying to get close the first time... Thanks in advance The 4300-A Square bore. This may help identify what you have.... 4300A, 441 CFM (1967-1969) The first version of this carburetor was released in 1967, replacing the 4100 on all Fords excluding the police package 428 CID and 289 CID high-output engines. 4300A 441 CFM specs: · 1" primary venturi · Primary throttle bore: 1-7/16" · Secondary throttle bore: 1-9/16" The 441 CFM carburetor was found to run too lean for the 390 CID engines; hence, the 600 CFM 4300A was developed the following year for these larger applications.[3] The 441 CFM 4300A was discontinued after the 1969 model year in favor of the two-barrel Autolite 2100 carburetor. 4300A, 600 CFM (1968-1974) Due to the limited flow of the 441 CFM version of the 4300A, a 600 CFM version of the same was released in 1968.[1] By 1970, it was factory supplied on most Fords equipped with the 429 and 460, in addition to vehicles with the 351 Cleveland. The 1973 and 74 versions were labeled Motorcraft. 4300A 600 CFM specs: · 1.25" primary venturi · Primary throttle bore: 1-9/16" · Secondary throttle bore: 1-11/16" Quote Share this post Link to post Share on other sites
