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Old 04-06-2011, 02:15 PM
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gas saving chevy 302mighty mouse on strip and streetable

well the plan is this. I am going to build a Chevy 302.(non origanal 302) and part theory is Since the 302 is smaller displacement, i am intrested in its stroke, piston speed, and how a small stroke takes for breathing and theoy is, the thing dont need much for breathing except for a cam and stock heads. And it would be for the 4 inch bore or more, would stock heads fufill a muscle maniacs dreams with small stroke? Or is the bore important to the theory? And not to mention the car im puttin it in is 3rd gen 1991 Camaro RS
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Old 04-06-2011, 05:44 PM
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Quote:
Originally Posted by chevy302builder18
well the plan is this. I am going to build a Chevy 302.(non origanal 302) and part theory is Since the 302 is smaller displacement, i am intrested in its stroke, piston speed, and how a small stroke takes for breathing and theoy is, the thing dont need much for breathing except for a cam and stock heads. And it would be for the 4 inch bore or more, would stock heads fufill a muscle maniacs dreams with small stroke? Or is the bore important to the theory? And not to mention the car im puttin it in is 3rd gen 1991 Camaro RS
Fuel injection, electronic driveline management, with an overdrive transmission if an automatic having a lock up torque converter is more important by far than engine displacement or stroke selection. The friction conserved with a short stroke to reduce piston speed is minuscule compared to these other issues which the factory has already well addressed in this car.

It takes so much power to drive a car, whatever the car. A small engine simply is pushed harder than a larger one to get that power. The power needed to move the chassis to a very large extent determines the fuel consumed.

Bogie
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Old 04-06-2011, 05:45 PM
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Oh boy, not this "magical 302" stuff again

You might try a search, it has been disussed many times here at Hotrodders.

The 302 Chevy is no silver bullet ,not in todays world.
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Old 04-07-2011, 12:10 PM
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it is no silver bullet, nothings perfect, but i want a great universle sbc, connected to the 4 speed. But hopefully, i get more out of the power to fuel ratio than the 305 which is idea for today, 3.75 a gallon of gas and rising. Hopefully all goes well
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Old 04-07-2011, 01:19 PM
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You are wasting your time and money on a 302.

Build a 305 if you want a 300 ish CID SBC.
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Old 04-07-2011, 01:49 PM
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Ok so we're starting with a 91 Camaro RS. What engine and what transmission does it have right now? How much are you looking to invest in this project?
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Old 04-07-2011, 05:20 PM
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well im planning on doing the whole bottom end, thats only concern for me. Ive got alot laying around too. In my budget its pretty decent i geuss, concidering ill have doe to dish. Ok bottom end specs. ESP-435030005700 summits eagle specialty products forged crank, 573.95. Ok summits 4 bolt block, cleared for 383, and its bored over 30 but stock blocks are more expensive. So im doing the summit block, instead im destroking this., it costs 651.95. Ok the set of connecting rods, there forged 5.7 inches, and they cost 373.95, ill look it up later. I hate the price of these keith blacks i also found on the summit site there 475.95. 90 dollar rear seal adapter kit, cheapest most intresting one $90. I cant list all of it, itd be to long
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Old 04-07-2011, 05:23 PM
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Originally Posted by Valkyrie5.7
Ok so we're starting with a 91 Camaro RS. What engine and what transmission does it have right now? How much are you looking to invest in this project?
ok well it has a 305 tbi, and the 4L60, i think that was before they changed it to electronic
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Old 04-07-2011, 05:31 PM
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o and im also planning on the summit cam, and summit valve spring kit, lifters and a cam $100, and $73 for the valve springs, steel retainers. I have factory specs for the cam, smaller cam. But they have one close to the specs of intrest
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Old 04-07-2011, 06:29 PM
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I'd build a bone-stock 305 and mount a small blower on top with a Quadrajet.
http://www.holley.com/types/Small%20...2%20Series.asp
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Old 04-07-2011, 07:00 PM
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yea that would be pretty kool. 305s are torquey, has anyone tryed one in there trucks at a mud boggin before?
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Old 04-08-2011, 08:07 AM
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I would not recommend a flat tappet cam. Use a roller, it's the better choice on several levels.

For what you want to spend on just a block from Summit- plus S&H, you could get an entire L31 engine in running condition. The block is already good to go for a hydraulic roller, and if you didn't want to run the Vortec heads they can be sold to recoup some of the cost of the longblock and machine work on it.

EFI would be more efficient than a carb for what it sounds like you want to do.

IDK what's up w/the mud bog/truck race question- is this a street build, or ?
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Old 04-08-2011, 12:03 PM
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I know its apples and oranges but don't the 5.0 302 Fords get better MPG than the 5.0 305 Chevy. Could the oversquare bore/stroke better breathing have some bearing on best economy.
302 chev vs. 305 chev ? just a thought.
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Old 04-08-2011, 01:08 PM
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Quote:
Originally Posted by Nonhog
I know its apples and oranges but don't the 5.0 302 Fords get better MPG than the 5.0 305 Chevy. Could the oversquare bore/stroke better breathing have some bearing on best economy.
302 chev vs. 305 chev ? just a thought.
yea thats what im thinking and thanks for bringing that up, The 305 shares the stroke of 350, and it has these heads that are made for emissions, which in my area isnt strict. 305 has to suck alot to get enough hp, the torque the same. Well what these guys have been talking bout on the forums is 305= bad. No flow in the heads. Four inch bore, and more hp is were its at. Of course this is a discussion of a build, the heads are going to be some reg 350 heads, lying around because i dont gotta worry about flow. With a small stroke. All i need is a cam to fit these heads, and stroke properly, which i will figure out. Dont need the roller cause a flat tappet works just fine, this cam isnt going to be huge cause of small displacement. Roller isnt a need
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Old 04-08-2011, 01:24 PM
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Quote:
Originally Posted by Nonhog
I know its apples and oranges but don't the 5.0 302 Fords get better MPG than the 5.0 305 Chevy. Could the oversquare bore/stroke better breathing have some bearing on best economy.
302 chev vs. 305 chev ? just a thought.
No. There's a lot more to factor into that than 3 ci and a small difference in bore. The Mustangs MPFI was a much smarter system than the TBI, the mustang was also lighter, testing with different trim levels (different engine options) and driving style/ driving conditions. That being said they both got pretty similar figures.

Are you determined to have a manual transmission?

IMO, If I wanted a third gen with a stick, I would have just started with one.
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