Ok my uncle wants to trade me his '73 350 Corvette motor. From the numbers I got off it thats what it looks like anyway. That comes 190 hp stock and has no machine work or anything vs. my 305 that has all kinds of machine work. Now I was hopeing it would be a high power 350 but I no go.

Im not gonna give the 305 up as is Im keeping my cam, high volume oil pump, and my heads. I would think that the 350 is only low power mostly from the cam heads and induction. I know the 305 HO heads on mine have smaller chamber but I was actually thinking that might boost the compression ratio and give me a little more power, not to mention the extensive machine work I have done to them and I think that the valves in them are bigger than what the heads will be on the vette motor anyway. Ill tell you tommorow or so when I pop the heads. And if you read my other post Im putting a 650 double pumper and edelbrock Torker II intake. Also putting a 2400 stall on.

Anyway what do you think, will the 350 with my heads and cam run better than the .040 305?

 

Depends on what kind of work has been done to the 305 heads.
If they have a good port job done then the compression boost will be worth it, but if not then they won't flow enough to feed the 350 and your power will be roughly the same. My $.02.

 

You have to find out what pistons are in the motor. It may have the 8.5 1 or 8.0 1 pistons. If that is the case you will need to up those to at least 9.5 1 to make any good power. Alot of the motors back then had very low compression. I put 10.1 in my motor. just my .02

 

I do believe the reason the motors from 73 where low compression was because of the large chamber 76cc heads, not the pistons. I have an 87 305 LB9 sitting my garage right now that has dished pistons that look just like the ones from the mid 70s.

If you put your 305 58cc chamber heads on that motor you should be over 9.0:1 compression easy. As far as flow goes, just by adding the 1.94 inch valves you should be close to the same flow as the 350 heads. The limiting factor being the shrouding from the small chambers. The 305 heads have nearly the same intake and exhaust volume runners as the 350 does. The only real difference is the valve size due to the smaller combustion chambers.

If you use the same cam and heads as on the stock pistoned 305 but on a 350 you can only gain hp. But keep in mind the gains are not extreme. I mean look at the horsepower of the LB9 305s compared to the L98s. It's not that big of a difference. It's just that the 350 allows for more aggressive heads down the road.

 

Ive been doint a little more research and I cant ever get the numbers to totally match up, I called my dad he has a book with most of the numbers. He got that it should be a '75 or '76 motor the only think I can get for sure is its from a '73-'77 Vette (not at all their best years for power)

But I figure even with mine being .040 over the 350 is still a bigger bore, so maybe I wont have such a problem with my cam bogging me off the line (thus the reason I bought the stall). And my motor is no slouch now so if I only gain power from it Ill be happy.

The casting number is 3970010 and the code is like V1203CLA if someone else wants to see what they can make of it.

 

Torker II = Aluminun ****box.

Seriouly, Edlebrock makes some great intakes, but the Torker II is 1970's technology. Get an RPM or RPM Air Gap. I cannot repeat it enough, that thing is a piece of **** and Edelbrock should have quit selling it a long time ago.

Martin

 

Oh well Im getitng it cheap, Im putting a 383 together this summer Ill spend some serious cash on an intake then but for now Ill do ok with the ****box.

And you can go ahead and drop this thread, my uncle was being stupid and wanted to trade me his stock 350 block that probably makes 190 if it runs and didnt want to give me my heads, cam, not to mention I just bought all new bearing for mine and he didnt want to buy me new ones for the 350. So Im just gonna put mine back together and have it in and spinning tires this Sunday. The only good thing I can say about the 350 was a steel crank.