Help identifing pistons in 400

[oak]

Hello I'm new and have recently been working on my 79TA it has 400 Pontiac and 4spd have disassembled the engine to check and see what I have. it looks as though the engine is original and only change to it other than the #16 heads are cam and pistons I am going thru engine but pistons look great and would like to know if anyone could help to identify them? I also need idea as to what cam I should use for street diving? I know that's a big question so disregard if you like . Any one in Toledo,Ohio area know of Pontiac engine guru?

 

[92 Sunbird LE]

Those are custom Pistons ( Ross, Wiseco, Mahle, Probe, Diamond just to name a few)

Stock should have 8 valve reliefs flat tops. ( see pic )

http://i486.photobucket.com/albums/rr230/09turbo/Pontiac 400/32.jpg

Thats all I can tell you, Mel should be on soon to answer your questions about cams for Pontiacs.

Doug in P.R.

 

[melsg5]

are you working with a machine shop? have you looked for local Pontiac clubs that could point you to a local machine shop familiar with Pontiacs. recommend you get and read this book before doing anything

http://www.amazon.com/How-Rebuild-Pontiac-V-8s-Workbench/dp/1613250355

 

[oak]

I have a machine shop already but they say chose what cam u want. I don't think to much will have to be done to engine ,it did run good but had a vibration found a problem with clutch and will have every thing balanced .they are a great machine shop I have been working with them for years Ill think pistons are good bore is great, heads look as though they where just done. I find it a bit confusing to figure out what cam to use though . Thanks

______________________________

 

[92 Sunbird LE]

http://www.pontiacstreetperformance.com/psp/camselect.html


http://www.compcams.com/catalog/204_205.html

https://www.lunatipower.com/Category.aspx?id=75

Doug in P.R.

 

[92 Sunbird LE]

Looks like anything over .470 lift requires stiffer/ different springs.

Doug in P.R.

 

[melsg5]

the cam choice depends alot on what the other components are. what compression, what intake, what make and size carburetor, what transmission, auto or man., what rear end gears.