307 engine

[craig manthie]

yes i heard that also

 

[88ss408]

you have to bore a 307 alot more than .060 to get a 350 size bore.
stock 307 has a 3,800 bore 330 has 3,938 and 350 is 4,057.
so i doubt it can be bored .257. but i did read that the 307 was cast as a think block.so maybe a 330 bore size is possible but would have to sonic test to be sure

 

[joe_padavano]

...so maybe a 330 bore size is possible but would have to sonic test to be sure

Not even close. You'll hit water first. The 307, 330, 350, and 403 blocks are all unique castings. 330 and 350 blocks (and complete engines) are not very difficult to find, at least not around here (mid Atlantic coast).

 

[broke1]

to the person about the gn moter i don't have a porblem with the gn engine it's a great engine, but did you build that gn engine?

GM built my engine.....

Only point im trying to make is more power can be made easier and cheaper than what you are planning.

A 3.8 v6 or 4.1 v6 will make 300hp easier and cheaper than your 307 without nitrous,turbo,or sc.

 

[broke1]

there is no problem geting 300 hp out of the olds 307! just pick your parts right. get good machine work (especialy the heads) and your good to go !!
gn's LOL it's funny how people dont get that a N/A motor is not the same as a blown motor it's like comparing apple's and orange's not the same thing at all.

Im no master mechanic nor do I claim to be but an engine is an air pump and they are all the same in principle,forced induction or NA.NA makes the power with air FLOWING thru ports,FI makes it by FORCING air thru the ports.Only someone who had no clue about forced induction engines would make a statement that theyre not the same thing at all.....Please explain to me what bit of evidence youve ever seen that backs up what you think.

Lemme guess,you have never personally worked on anything with FI have you?

 

[craig manthie]

thats my point it is easier and cheaper do a v6 than a 307, but the 307 is a challenge. and i'm tired of dealing with your backyard mechanics!

 

[broke1]

Its not a challenge,its a bad choice.....

If the 307 was worth somthing,had sentimental value,or was all you had to work with,then you would have valid reasons

Your not doing any of the above so IMO,its a waste.We all like to be different and I can understand that but doing the wrong thing is still wrong no matter how u sin it.

Reminds me of a buddy with an 85 MCSS with a stroked 305 back in the day.All the good stuff,forged crank/pistons/rods,maxed out iron heads,custom roller cam,msd ignition,4.10 gears,28x10 slicks,and a 250hp NOS big shot kit.Best the car would run is 8.0's in the 1/8 on the 250 shot and slicks.

Same car with everything above but a stock tbi truck 350 and a different cam would run 6.5's all day long.

 

[dan2286]

Im no master mechanic nor do I claim to be but an engine is an air pump and they are all the same in principle,forced induction or NA.NA makes the power with air FLOWING thru ports,FI makes it by FORCING air thru the ports.Only someone who had no clue about forced induction engines would make a statement that theyre not the same thing at all.....Please explain to me what bit of evidence youve ever seen that backs up what you think.

The engines are the same basic designs, but a forced induction engine uses completely a different theory to build power and make them last. Someone that knows how to build a N/A engine will probably not know how to make power out of a forced induction engine, same thing the other way around. They need different cams, fuel systems, compression ratios, exhaust, etc.

 

[custom442]

Craig manthie -

I would suggest looking into different engines before you jump into building the 307. I think it could be a good investment depending on what car you have. If you've got something special - 442, hurst, ss, etc. - then you might consider keeping the original engine and building something a little nicer out of it. I don't see the 307 ever making big power...ever. To make it fast as others you'll need major weight reduction and serious gearing.

To put it in perspective - I'm finishing up a 383 build, total for everything including every nut and bolt, is around 5,500$. My guess is somewhere between 460-490 hp/tq. If you'd like a 307 putting out that kind of power, you could very well sink 5,500$ just in the heads.

If money isn't a concern and it's the right car, then go ahead. But being 'unique' will hit your wallet hard.

 

[dan2286]

If the 307 was worth somthing,had sentimental value,or was all you had to work with,then you would have valid reasons

Or how about the satisfaction of being able to say that he was able to make a 307 have some decent power??

Just because his views are completely different than yours, it doesn't mean you need to bash him for his decision. He obviously knows what he is getting into.