Going from 302 to 306.. a big difference?

[dkhl]

I'd like to know what kind of power I would get from simply boring the engine 30 over..

thanks

 

[Scorcher2005]

boring a stock engine over 30? if so, you wont gain anything. Think of it this way, say you had a 302hp 302ci motor. Thats 1hp/cube. You now have 306ci, so u now have 306hp for a total of 4more hp. Your not even going to feel that. i suggest if your car is completly stock you get some exhasut and gears.

 

[5spd GT]

Well from a worn-out 302 (assuming you would rebuild the rest of the bottom end)...to a fresh 306 it would be noticeable and would be a nice thing to do for the longevity of the engine...

But fresh 302 vs. fresh 306...a few horspower maybe...

 

[PhLoBuS]

not worth the time and money is how I see it unless your engine is going...

 

[dkhl]

No, the engines in the shop still.. it's already been bored to 306, but i did a whole bunch of other things with it.. I was just wondering for curiosities sake what would happen if i just bored it stock.

 

[5spd GT]

No, the engines in the shop still.. it's already been bored to 306, but i did a whole bunch of other things with it.. I was just wondering for curiosities sake what would happen if i just bored it stock.

You did the right thing...that 306 gives it a "new" cylinder wall...for the pistons and rings to "sit" in...

 

[green]

yep, it wont give u much more power but it will give u new cylinder walls

 

[04sleeper]

Thats why most replacement blocks are 306's. They bore them to get a True cylinder. Not for HP reasons.

 

[N8Miller]

But fresh 302 vs. fresh 306...a few horspower maybe...

i hear its like 4-5hp. like said before, do it if your engine is in need of rebuilding.

 

[5.0Droptop]

made a huge diff on my car..






but then i went to afr 165 heads tfs1 cam and other goodies too...

 

[90mustangGT]

Going 306 you have to use different pistons, that can have an effect.

Like said before fresh 302 vs. fresh 306, hardly anything. I have heard that .030 overbore will help unshrowd the valves a little more.

Like said before worn 302 vs. fresh 306, big difference. I think some people overlook the actuall engine. Spend all this money on a nice set of heads, an a good cam, slap it on an worn out engine and wonder why they are getting beat.

Also, a worn stock 302 vs. a fresh 306 with higher comp pistons, balanced, good rings, world of difference.