350 piston part number

[dab67]

In 67-68 the 350 I believe only came with one piston part number because it was rated at 295 hp. What was that part number? Was it a flat head or domed piston? In 1969 that changed. There were about 6 different horsepower ratings for the 350. What were the part numbers for the 300hp and the 350hp 350engine. Were both of these domed pistons?

Dave

[1968RSZ28]

Dave -

The factory pistons for the 350 engines in '68 and '69 Camaros where all the same regardless of horsepower.  They were flat head pistons with reliefs in them for valve clearance.  I don't know the part numbers, maybe Ed could look them up in his P&A book.  The only domed head piston Chevrolet used in the 350 engine in this time period was the one used for the '69 350/350HP Corvette.

Paul 

[lakeholme]

Dave,

Are you reffering to a p/n on the piston itself or the P&A p/n?

Paul is right: Colvin (pages 121, 125, 128) confirms all those pistons were flat head except the 69 350/350HP Corvette.

At any rate, the P&A 30A (rev. 8-72) list the pistons as follows:

67-70 All(350)(exc. Sp. H/Per.)     STD.     .001 O.S.     .020 O.S.     .030 O.S.
                                              3911020  3911021     3911022       3911023
70      All w/Sp. H/Per. (350)      3989048  3989049     3989050       3989051

I checked an Oct. 1, 1967 P&A 34 and it confirms 67 & 68 numbers.

Again, I'd run all this by Ed...

[sam]

Dave, I would probably go with an after market piston anyway. JMO. There are many pistons manufacturers out there. Ask Jerry M. what he likes and go from there. Ricks First Generation probably carries them, so does Jegs.   Sam

[bertfam]

You got it right Phil. Note that those part numbers are the "piston with pins" though.

Ed

[dab67]

Thanks all 4 of you (Paul,Phil,Sam and Ed).
Trying to get as much info as possible to determine which way I am going with the rebuild of my engine. I wasn't sure if I have to change pistons if I go with a 350/350hp cam. By that I mean do I use new ones(aftermarket like Federal Mogul) of the same type (flat) or do I have to go with a domed piston because of the change in cam. I want to make sure I know what the company is talking about when we do discuss it. If I remember correctly, heads and cam help determine the horsepower, with the bore and stroke all being equal. Was not sure how the pistons fit into the equation but seeing that the same piston was used across the board on the 350 except the 350/350 hp Corvette it appears it was not a great factor.
So would this be a accurate statement to make? If I install an aftermarket 350/350hp cam, I could use either a flat or a domed piston in combination with this cam?  Not sure I ever stated this, I have 0462 camel hump heads on my car. (Awfully long winded for an old guy!!!!!)
Dave

[sam]

Use the pistons like Paul says.  Stock flat tops with the valve reliefs. You stated that you did not want to modify the motor to a real extent. Keep it simple. Stock pistons, 350/350 spec cam or there abouts, cast iron intake, Q-jet, and nice exhaust system (headers??) and have Jerry do your distributor. Its all about the right combo and set up. Remember you are running a P-Glide trans too. Car will give you a nice exhaust note and some nice low and mid range power. You can dress it up with a pair of Z/28 valve covers if you want. And after its set up and tuned properly, you will probably never have to mess with it again. No overheating issues either.  Sam

[JKZ27]

I too would like to find the best possible replacement (stock type) pistons for my 350/300. I want to keep the weight the same and maintain the compression ratio.

John