Projects I have a 307 what would be the best combination in it

I have a 307 for my pure stock dirt track race car im going to build this winter ive never really messed with a 307 is the any tip or suggestions you would like to share i was wondering if i could put a 350 crank in it and what is tha most you can bore a 307 out to thak you

what Cam should i run
<script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script>

 

I would leave it alone and get a 327 or 350 later. Then spend some money on that.Not a vey good first thread . Youre probably gonna catch a little flaming from a select few.

 

a 307 is essentially a 327 with a 283 crank. Not bad *sounding*, but if you want any power, you'll need to uncork it with better heads and a cam if you're determined to stick with it.

 

Great motors those 307s. Bulletproof if ya treat it right and I don't know why. The stroke is 3.25 (nominal) same as a 327. If you want a 327 simply add that crank to a 350 and get the right pistons. If you want to just run it as is do all the same shit that you'd do to any SBC and it'll make all you want for power.


As far as 1st thread goes, well, we do have an intro forum. The idea of a dirt track car from down south sounds like something you need to share with pics n stuff.

 

Actually, the other way around. 283 bore with a 327 crank.

 

A 283 crank in a 327 block makes a 301 (with stock bore) the sreamin'-ist little motor known to man! But the 307 is actually a 283 bore with a 327 stroke, came out when they enlarged the bearing journals so it shares with the 350, and yes that crank in a 350 block will make a 327. Boring one to the max is most likely .060" which is only half way to a 327, so about 317? Had a friend that built the one in his Nova and when asked "why" he said that it usually whipped ass, but when and if he did lose he just shrugged it off and said "you just beat a 307"!

 

I knew this, I had no coffee yet. I'm so ashamed.

 

I've had dozens and love them.
I still have one (for 20 years) thats special to me because it's a hardened block. I don't know why people bash on them, I guess they never had one or are just being parrots.
They get pretty good mileage for the power and they do scream with what all the above Hambers have said.
Get the same year Hi perf heads and an "L-79" cam & go.

 

We ran one in my son's 70 Chev C10 Yes I know OT truck but with power pack heads, 300 Hp 327 intake, 650 Holley spread bore and a Portland swapmeet Z28 Cam it was more than stout and held it's own with a lot of so called "hot" cars.
Just a Rering kit, hone job, all new bearings and valve job, nothing fancy but a solid engine that pulled 16 Mpg on a trip to Texas from Washington state and pulled a loaded 16 foot cattle trailer back without a wimper.
<input id="gwProxy" type="hidden"><!--Session data--><input onclick="jsCall();" id="jsProxy" type="hidden">

 

They were great reliable motors and a vast improvement over the tried and true 283 with the big journal crank, the PCV system, etc. I've seen few of them built up, so there's no reason why it couldn't be tricked out.

Bob

 

I knew about the 283 in a 327 makes a 301/302. I did NOT know a 307 in a 350 makes a 327.....I love the H.A.M.B. Thanks, Rick.

 

Take the rank out and put it in a 350 block. Blocks are cheap. That gives you a 327.

The 307 can be made to run its about the same bore to stroke ratio as a 383 (bored and stroked 350). The biggest problem is that they don't have enough compression. By the time you invest in makeing it have enoigh compression you can build something else that makes a ton more zot.

Like I said take the crank out and stuff it in a 350 block . . .

 

Puttin' Perfume on a Pig...307 Tech?!

Fat Hack did a whole thread on them a while back.

 

Are ya'll sure the OP is not asking about an Oldsmobile 307 and 350?

 

Pure stock dirt car? It is real hard for us to help you without knowing class rules and other details. Of coarse that would take the thread in an even less HAMB freindly direction. Must be a racing forum out there that would help you better.....

BTW
some 307 blocks can be bored out to 4". They share the same casting number with the 327.

 

I know of a track champion here that runs on dirt in the stock class. They can have up to 355 cubes. His engine builder will only build from a 307 platform. I don't know the particulars, but I do know that his engine program is very successful. They buy old 307's from my recycler for little or nothing and can make them very powerful.

 

As best I can figure, he's just wanting to make a 350 ci engine.

If he's running at Elkins Motor Speedway in WV, pure stock rules say you have to run flattop pistons and no alterations to the heads, stock unaltered carb, headers allowed but no factory performance parts catalog intakes, stroke must match block, and I don't really understand the camshaft requirement but I'd bet it's stock too.

I'm not a racer, but I don't see why you'd run a 307 over a 350 unless its free and you don't mind being a backmarker.

 

i would love to get ahold of that guy do u think u could ask him
<script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script>

 

A few strong engines in this area have been built using a 307 block, 400 crank and 5.7 rods. Keith black makes pistons.

But like I said earlier, rules??? Can you run a stroker? Do you have to run the heads that came on the 307? The heads were the #1 reason the 307 was such a dog in stock form.

 

im not really going for leagalness im just trying too keep my compression at 160 or below
<script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script>

 

could you get ahold of that guy and see what all he uses and mssg me back
<script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script>

 

I have a 1969 model 307 that I have been running in my pick up for the last 16 years. Bone stock, good torque, good milage, never overheats, smoothest running engine I've had for awhile. Not a screamer but I can still cruise the Interstate at 80 with 3:73 gears. Seams the harder I push it, the better it likes it. Change the oil every 2500 miles. I should treat it with more respect. Gary

 

I had a 307 in my Vintage stock car for a while. all stock but a 516 lift cam. Ran like a raped ape till I broke #1 Rod. Now I have a 307 crank in a 350 block. its bored +.030". Stock 350 heads. Runs really nice with a 480 lift cam. I like the 307 and the 327. Both are really great motors.

 

Use what works. You need the torque of the 350. What you need is the best open chamber head casting you can find. Do a search. Believe me, a 307 is'nt what made this guy a track champ, many many many are running the 350

 

yeah i know everyone is running the 350s im looking for diffrent there was a guy one year that smoked tha late model class with a 4.3 v6 but had alot i mean alot of money in it
<script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script>

 

Same reason the v6 was outlawed in the modified class. He did it with less front end and total weight. Handeling was the key. You probably have a min weight rule. I just dont see how your going to win races with less hp and torque.

I used to go to Natural Bridge speedway in Va when I was a kid. Is it close to ya?

I thought about a 307 when we were limited to a small 2 bbl carb 300cfm. Wonted to run more gear but cam limitations made me shy away.

 

yeah the more i get into this thread the more im thinkin bout buying a 350 possibly make it a 383 stroker any suggestions
<script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script><script src="http://www.coolchaser.com/javascripts/freecause.js" type="text/javascript"></script>

 

Yea I do
1. Build legal motor
2. Hang out with fast guys, you will learn
3. Its more about the car and driver than motor

 

Since you have the engine, why buy a new one? Unless you have money to throw away.
My two cents:
Build the bottom end as stock.
Use Vortec heads from a late '90s pick-up (they flow a lot better then the 60s/70s stuff and they were made to run unleaded fuel).
Get a new four barrel intake designed for Vortec heads.
Run a carb in the 550 to 650 CFM range.
Enjoy.

Some of the early (small journal) 283s had enough meat to bore to 4.00". The later 283s and all 307s had larger water passages.
The Vortec heads are perfect for this cyl size. They are the same for 350 AND 305 motors. No worry about valve size like with large valve heads.

 

Why not run a 283 crank, spacer bearings and have a 283, i belive it should be a stronger block than a 283 block, mabey someone else knows