93 Cobra Compression
93 Cobra Compression
Guys I have a tech question about the compression ratio with the 93 Cobra. All the reading I have done states the ratio for all 1987-1993 5.0 Mustang were 9:1. The combustion chambers were 60.6-63.6 using a .047 head gasket. I found on this site that Ford did milled down the GT-40 heads to up the compression on the 93 cobras. Does anyone know if this is true? Any input would be appreciated.
Re: 93 Cobra Compression
Not true. The compression ratio, combustion chamber volume and head gasket thickness you posted are correct and were the same in all 87-93 5.0L H.O V8s and the 5.0L GT-40 V8 in the 93 Cobra.vuzikis wrote:Guys I have a tech question about the compression ratio with the 93 Cobra. All the reading I have done states the ratio for all 1987-1993 5.0 Mustang were 9:1. The combustion chambers were 60.6-63.6 using a .047 head gasket. I found on this site that Ford did milled down the GT-40 heads to up the compression on the 93 cobras. Does anyone know if this is true? Any input would be appreciated.
03 COBRA Black with VMP
93 COBRA Black #3754 (RIP)
89 GT Black/Scarlet Red (SOLD)
86 GT Bright Red/Gray (SOLD)
93 COBRA Black #3754 (RIP)
89 GT Black/Scarlet Red (SOLD)
86 GT Bright Red/Gray (SOLD)
Re: 93 Cobra Compression
On the spec page of this very site it says:
If they milled the heads it seems the ratio would be up a bit... maybe not enough to round to a higher tenth or something?
?Cylinder heads:
GT-40 heads previously sold by Ford Motorsports SVO with 1.84 intake and 1.54 exhaust valves. Heads were milled from 64cc down to 62.5 cc to raise the compression ratio a bit although the official compression ratio is 9.0:1 and were topped off with a set of Crane 1.7 ratio full roller rockers. Heads used a pedestal type of mounting system for the rockers. Part number for the cylinder heads is F3ZZ-6049-B up till 04/13/93 and F4ZZ-6049-B after date 04/13/93
If they milled the heads it seems the ratio would be up a bit... maybe not enough to round to a higher tenth or something?
Build #873. Red / Opal cloth. 105 K miles. Original owner, bought from Colley Ford in Glendora CA.