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Originally Posted By: Monte88 What doesnt apply? A physical constant is just that..... He asked if making HIS engine larger is bad for mpg, the answer is yes....thread over. .. Sorry, but the answer is still NO... HIS particular "case" here is a very inefficient 350" with 7 MPG, versus going to an efficient built 383"... while going to 383", the smart thing to do is also build it for much higher...

get a guarantee of a refund if they are cracked(or buyer beware), vortec heads can crack between the valves or along the exhaust seat if abused before pulled. I can typically find a set of Vortec heads already modified and ready to install for about 500-600.00 so buying ones that still need work may not be a cost saving action unless you have an in with a machine shop or can DIY it...

big blocks are more thermally efficient due to the increased volume to surface area ratio of the piston and cylinders (larger bore). less thermal energy can escape through the block per unit volume. fuel is a different story....

8500+ rpm and over 800hp, those boom tubes work great on a NASCAR engine because they don't need low end torque

good article on the vortec heads http://www.chevyhiperformance.com/howto/97458/index.html any gen1 head will fit, even the ones from a 305. to make more power u need to consider bumping the compression ration. 70'ish 350s were smogger engines and had dished pistons with about 7.5- 8.0 compression with 76cc heads. most stock heads on 350s are the 882 castings and are prone to cracking, mine has those and runs well but like alot of advance...

aside from machine work that has already been said what are some other small details to a motor that can influence more power gain. IE spark plugs, wires, oil and filter etc

Awesome! OK, time the car with the connector unplugged. Do I shut the engine off and then plug in the connector or do it while its running?

found a guy on craigslist with the 062 heads for 150/obo. about a 2hr drive from me. Im gonna try to to talk him down to 100. but from what i understand 150 is a good price considering they are 500 and up for a brand new pair.

Put a Qjet back on.

Yeah your right FinallySS. But we have 6 to 8 SS's Between my buddies and I right here on Oahu, So we're trying to start a club. If you interested get back to me.Or if you looking for a certain parts we might have it.