Author Topic: 1973 350, what can be done to beef it up?  (Read 598 times)

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Offline TeamPontiac88

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1973 350, what can be done to beef it up?
« on: January 23, 2014, 01:41:44 PM »
Hi, I have someone local selling a 1973 Pontiac 350 for $400.00. My question is is it worth going through all the trouble of replacing my working 301 for a 350 that has just 150 hp? What do you guys recomend? Can this engine be woken up? Thanks!

Offline 72blackbird

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Re: 1973 350, what can be done to beef it up?
« Reply #1 on: January 24, 2014, 02:11:45 PM »
The 350P shares the same 3.75" crank with the 326, 389, and 400, so it responds to mods just like these engines. The small chamber 72cc heads that make 10:1 SCR on a 400 will only make 9-9.2:1 SCR on a 350P- perfect for pump gas. The 350P does have a smaller bore than a 400 (3.875" vs. 4.12"), so you have to be careful when adding big valve heads- check the piston-to- wall clearance. Some 350P's like the 350 HO had small chamber, big 2.11/1.77 valves like no.48's on them- the tops of the cylinders were chamfered to allow these heads to work on them. In fact the small chamber heads w/ 1.96/1.66 valves are better suited to run on a 350P- look for no. 14,15,16,17,18, 46, 47 small valve heads. These will all wake up a sleepy 350P.

The other traditional bolt-ons/ upgrades also apply- a cam, 4 bbl., headers, and ignition upgrades go a long way towards building hp. Cams that work well with a 9-9.5:1 350P are the Crower 60916 or 60240, Summit 2800, and Comp XE 262H- there are others. Expect around 300-350 hp with all of the above upgrades, more with ported heads.

Geno



Offline TeamPontiac88

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Re: 1973 350, what can be done to beef it up?
« Reply #2 on: February 01, 2014, 11:38:05 PM »
Thank you!