[D.Knapp]

ive got a 67 bird and a 79 T/A and i need to get 2 strong and reliable engines (1 a little stronger for the 67) out of these bottom end and heads that i have. and am not totally sure what i have and what would be best to use. this is what i have according to the hollander interchange manual that i have.
bottom ends... 74 400, 67 400, 73 350, and a 62 389 .030 pistons.
heads... 74-76 455 (4x)screw in studs,73 46 or 48 (casting rust, could be either), 67 142 (pressed), and 58 389 (531395), and i also have the 403 that is tied up in the T/A......

[D.Knapp]

ive got a 67 bird and a 79 T/A and i need to get 2 strong and reliable engines (1 a little stronger for the 67) out of these bottom end and heads that i have. and am not totally sure what i have and what would be best to use. this is what i have according to the hollander interchange manual that i have.
bottom ends... 74 400, 67 400, 73 350, and a 62 389 .030 pistons.
heads... 74-76 455 (4x)screw in studs,73 46 or 48 (casting rust, could be either), 67 142 (pressed), and 58 389 (531395), and i also have the 403 that is tied up in the T/A......

[android 211]

You'll be miles ahead and dollars saved if you stick with the 403 in the T/A. If you want more power dig up a set of '68-'73 350 cylinder heads for small block Olds. To adapt them to the 403 the main obstacle is just enlarging the head bolt holes. They flow considerably better and will up the compression. A quality rebuild and a good cam will have 350hp out of the T/A 403 easy.
Put the 46 heads from the 350 on one of your 400 blocks along with flat top pistons for the '67 Firebird. They breathe decent despite the small valves. Compression will be just under 10:1 which is as high as you want to go.
Sell all the 389 parts; they're obsolete.

[D.Knapp]

whats the difference between the 46 (350), and the 142's,