RichG

I was referencing the data that Chevy provided for the 1970 model year. Can't say about 1971 or 72. I know that higher numerical ratio's were available over the counter from parts department but the restoration packet includes the data that they provided to the AMA and the format that the dealers used to fill out the order sheet. Both only list the 3 ratio's each for 10 and 12 bolts. It would be interesting to see a build sheet with ratio's other than what the books say.

Was reading the 1970 restoration booklet on rear gears. Quite lengthy but it lists the "standard" gear ratio for all of the power team configurations. Basically the pontiac rear was the 10 bolt and was only used on 350 2bbl cars. The ratio for a 3 spd manual = 3.08 and a 4 speed = 3.36 a powerglide = 3.08 and th350 = 2.73, 350 4bbl = 12 bolt rear, 4 spd = 3.31 powerglide & th350 = 2.73 400 2bbl = 12 bolt 4 spd = 3.31 and th350 = 2.73 402 4bbl = 12 bolt 4spd & th400 = 3.31 454 = 12 bolt th400 = 3.31 . According to the restoration guide there were 3 ratios available for the 10 bolt, 2.73, 3.08 and 3.36 and 3 ratio's for the 12 bolt, 2.56, 2.73 and 3.31 all ratio's for all rears were available with posi.

The numbers are out of GM parts data, they don't specify anything other than what I posted. If you buy that part number cam from Chevy you are supposedly getting the "factory correct" cam for the application.

The stock cam should be: PN 3883986 lift 0.460 inch intake, 0.488 inch exhaust Duration 213 degree intake, 217 degree exhaust Hydraulic lifters and the profile was the same for 1966-69 427 390hp, 1966-1970 396 350hp, 1966 396 360hp, 1970 454 360hp and 1971 454 365 hp.

My 71 SS454 car, assembled in Baltimore, was Rosewood metallic with the under side of the hood done in about 40% gloss black, I.E. not flat black but not really semi gloss either, and my 70 Monte, built in Los Angeles, was Champagne Gold with the same 40% gloss. When the car was painted black, we taped off the underside of the hood so it is still the same factory paint.

Power door locks through 1969 were vacuum and from 1970 on were electric. I'm not sure of the year of switchover but power trunk release solenoids were the same way.