Chevrolet small block 305

I have a Pontiac 307, but is essentialy a Chevrolet 305, and wanted some advice on the buildup. I want to know what type of cam, crank, roller rockers, and should I go with TPI, or a 4 barrel carb??I am only 14(the Stang is my father's) and am on a budget. I just picked up my engine stand today and am ready to dig in! I will probably use 3:73 gears or lower(def not 4:10's). I figured you guys would have some helpful information and advice on this subject. Thank you in advance.

If you want less work go with the carb.

I have heard that 3.42 are one of the better gears for performance and gas mileage.

Thanks, I don't even know if I could afford the TPI anyway. The gear recommendation is great! I have been contemplating on what to go with for a while now...

ive heard that lunati cams are pretty good, are you going to do a roller motor?

I don't know much about the two: hydraulic or roller, so if you could give me some information on both, it would be great.

I don't know much about the two: hydraulic or roller, so if you could give me some information on both, it would be great.
Your 307 is most likely from late 70's to early 80's so its not roller.

I think you need 1.5 rocker arms.

If I was you I would get a JEGS catalog and look at the different cams and rocker arms. Usually the cam companies have a description of the range and aggresiveness of the cams.

You should really just use the 307 as a boat anchor or something. Its kind of a pointless engine to build up. Look around and find a 350 or 400 block/heads and build that up instead. Youll be happier in the end and will probably end up costing the same or less to build and will have more hp.

it's probly better you didn't make it a TP anyway, it's more expensive, and 14 year old's are tooooo stupid to make it work anyway. good luck!

[QUOTE]it's probly better you didn't make it a TP anyway, it's more expensive, and 14 year old's are tooooo stupid to make it work anyway. good luck!


Thanks for the luck, and yes, I am only 14, but that doesn't mean that I can't make F/I work.

[QUOTE]it's probly better you didn't make it a TP anyway, it's more expensive, and 14 year old's are tooooo stupid to make it work anyway. good luck!

Respectively age shouldn’t matter with the eagerness to learn and correct me if I’m wrong, but boards are a good place to look regardless of age, gender or nationality.
From reading the post, the 14 year old seems highly intelligent and able to perform the task he has asked politely on this particular board just from reading his/her post.

I guess my question is, what body/car are you planning on dropping the 307 in?
In all do respect, I believe the 350/400 block (Chevy of cores) is your best bet and roller motor is always a great option.
I would recommend picking up a copy of “Desktop Dyno” from online or if your local parts store should have this software. You can toy around with your imagination and get the results you are looking for without even getting greasy.

I hope this helps and good luck with your project.

I was under the impression that a 307 was it's own block. But if it is a 305 block, it's best suited to hold down the tarp that covers a 327 build in progress.

Enjoy though :)

I have a Pontiac 307, but is essentialy a Chevrolet 305, and wanted some advice on the buildup.
I think you may have an Oldsmobile engine if it's a 307... WAY different than a chevy, way different... How many bolts are on the valve covers?

No, it is definitely a Chevy small block, but technically it is a Pontiac, by the numbers. Thank you for the advice on getting a copy of "Desktop Dyno". That sounds like just what I am looking for! I have a 305 and a 307 as I previously stated, and they are just alike aside from the 307 being a '69 with "power pack" heads and 4 barrel, and the 305 being a emission engine with a 2 barrel in the mid 80's. Thanks to all that replied! And no, it isn't going to be used as a weight, I think I can pull some decent power out of it, and I can't afford a 350, so it's all I have!

No, it is definitely a Chevy small block, but technically it is a Pontiac, by the numbers. I have a 305 and a 307 as I previously stated, and they are just alike aside from the 307 being a '69 with "power pack" heads and 4 barrel, and the 305 being a emission engine with a 2 barrel in the mid 80's.
Ahhh, I didn't realize it was an older engine! It is definitely a chevy piece and the best part is it's got a 3.5" stroke forged steel crank! Throw that piece in a 350 block and you'll have a 327 shortblock capable of 7K rpm!! My engine uses a crank with that same stroke and my block has a 4.125" bore (making it a 350) and it winds up quite nicely while giving tons of torque and surprizingly good mileage! You have lots of potential there!!

if this is the chevy 307 it is capable of quite a bit of power, but as several have said before the best part is the crank. I would check the junkyards for a derilict 350 and start there. core 350's are around 50 to 100.00 put your crank and rods in, get forged 327 pistons and a set of vortec heads and have 400 hp for around 1000.00 if you stay with the block youhave you will pay more for the 283/307 pistons and have limited breathing room from the heads youhave, larger port heads will not fit in your block due to the small bore. seriously. get a junk motor and start there.