stock70SB

Anyone know if it is posssible to change the 350/300 to include the 350/350 cam and large valves w/o changing the bottom end? Will the stock 300HP pistons allow for these changes w/o changing the upper end geometry?
:steering:

SanDiegoPaul

Yes, Yes, and YES!! No question other than "how many miles on bottom end?"

Vetterodder

As Paul said, it's all doable and without any clearance or geometry problems. The cam is where you'll see the most power gains and, unless the heads are already being reworked, you won't see nearly as much bang for your buck by going to the larger valves. While your stock valve springs were adequate for that cam when new, if they haven't been replace recently I'd recommend some new ones.

stock70SB

Thanks for quick response. The car has 36k original miles. The previous owner put large chamber hardened valve seat heads to accomodate lower octane street driving. I'm in the process of buying a set of bare heads (186's)from a fellow forum member. I will have the heads reworked to accomodate the changes to the cam and larger valves. Thanks again.


[Modified by stock70SB, 10:59 PM 12/23/2002]

stock70SB

I posted the changes I plan to make to Paul's response. I'll install an all new valve train with the reworked heads to make it all work together. Thanks for the advice.

Smokehouse69

You might want to re-think that 350/350 cam. It was a great cam 30 years ago for a manual transmissioned car with a fairly steep rear gears. It was sort of doggy in an auto car with stock convertor. I know because I had one in my car. It pulled like crazy from 4000-5500, but it was quite flat below 3000 rpm.
There are more modern cams from Comp and Crane that will work much better in most applications.

stock70SB

I've got a 4-speed w/ a 3:36 gear that I'll probably change to a 3:73 to use the cam in its rpm range. Thanks for the heads up.