Lil 307 that could....

[RCbowtie69]

Hey from N.C. looking good,hope you get what you want ,for HP,307 are good motors, if maintenance is done ,good luck & keep on truckin''

[tomtuna1978]

whats up with this jeep fan mod ? what year fan did you use and what fan shroud is that ? i like the lil motors too but i wanna build a 302(4in bore and 3in stroke) for the cylinder filling(4in bore is better for it ) and the revs .... 302 with vortecs and long rods ! .... i bet that 307 will last for years to come good luck !

[screamin_c10]

Well setback # 347 the shim gaskets are leaking so I'll be yankin the heads again and using Felpro composition gaskets. Gonna have to wait until next weekend though....

[screamin_c10]

Originally Posted by tomtuna1978

whats up with this jeep fan mod ? what year fan did you use and what fan shroud is that ?

Linky

The fan shroud I used is the original 307 small block shroud. I have a big block shroud that I was going to use, but it's opening is too large for the jeep fan. Oh well more for the ebay pile.

[Jacfourteen]

Originally Posted by screamin_c10

Well setback # 347 the shim gaskets are leaking so I'll be yankin the heads again and using Felpro composition gaskets. Gonna have to wait until next weekend though....

Too bad, I was hoping to hear good news. That sounds like not alot of fun, hope it works better next time.

[screamin_c10]

Originally Posted by Jacfourteen

Too bad, I was hoping to hear good news. That sounds like not alot of fun, hope it works better next time.

Aww hell, stuff happens, swapping out the gaskets wont be so bad...all the hard stuff has already been done....

[rocketwheels]

...this 71 camaro rs had a 307Turbofire 2bbl with a powerglide 2spd trans. She weren't no slouch. No a/c ,manual steer/manual brakes, nothing holding it back.



My best friend had a 4bbl350/turbo350 72 camaro at the same time, we'd always line em up anywhere we ran across each other. I would always get the jump on him and carry a full car length until those 4bbl on the 350 got wound up at the end of his 2nd gear, then I'd pop 2nd and get a little jump again...but then the 4bbl 350 would just roll on by as he went thru 3rd gear.



...unfortunately a rocket scientist, here in Huntsville Alabama, doesn't understand how an unprotected left turn light works with on coming traffic.

[screamin_c10]

Damn...that sucks, that was a good lookin split bumper too....always liked the 1st gen camaros and the early second gen split bumpers.

[screamin_c10]

HA HA Success!!! She runs like a raped ape!!! I still have to dial in the advance curve and limit the timing, install the relay and switch for the fan and replace a cracked exhaust gasket...but she runs and has a very nice lope at 700rpms...

[redbaron69]

SWEET good job

[nickp51chevy]

Sweet!

Do you have any video so we can hear and see it?

[screamin_c10]

Originally Posted by nickp51chevy

Sweet!

Do you have any video so we can hear and see it?

Once I get her dialed in, I'll get some video shot. Time to hit summit up for some more parts....

[Jacfourteen]

Great to hear you got it going! Can't wait to hear/see it run in the video.

[screamin_c10]

So here she be....dont mind the dirty interior and body...She gets used and abused. Once spring hits she'll get a detail along with the F150.

She's still running the factory ramhorns at the moment...Chevelle mid length headers and a 3" Flojo single exhaust are in the works once Christmas is over....

YouTube - Screamin 307 Vortec.MOV

[nickp51chevy]

Wicked

[Jacfourteen]

Sounds good!

[bigguy69]

sounds great!!

[screamin_c10]

Thanks guys....Cant wait til I get the new exhaust welded up and hung...the Flojo muffler is a wicked sounding setup...

[y5mgisi]

BUDGET! Sounds f-in sweet! Bet its a blast to drive and gets pretty good mpg also!

[60ratrod]

too bad they don't make 1 piece rear main roller block for the 307.

[dan42]

That's very nice - you did a lot with a little. Very impressive.

[Hubscrub]

very nice and love the truck also

[noonzor]

wiiiicked!

[andymarkv]

Very nice!!
So you figured your compression to be 9:1 with flat tops .025 in the hole, 64cc chamber vortecs (that is the same as stock, right?) and .021 gaskets?
So your compression increase would come from the gasket thickness?

I thought by 71 307's got dished pistons?
Do you happen to know what your craking compression was before and after the hop-up?

Do you know why the steel shim gaskets leaked? Did you spray them with copper coat or other sealer? The factory head gasket was also a steel shim, right?
I was thinking of using the same head gasket to keep the quench distance tight. But I would rather not have the hassle of leaking gaskets....

Sounds like a great build on a budget. I was a moron for not picking up a couple sets of Cash4Clunker L31 heads...... I thought the sodium silicate would get into the guides and whip them. But they were so cheap I should have taken the chance...now they've all been scrapped.

I think you did the right thing! These 307's really seem to wake up with some compression.
I'd love to get the compression up to 9:1 in our 71 307. (the cranking compression is 120-125psi on all holes) I did everything but the heads and used a smaller 206/212 comp cam. While its better, it still feels lame. But it must have 8:1 or less. I was thinking about going the 416 58cc 305 heads, but the compression will be up twards 10:1...which might be too high for my application.
So I'm looking for cheap easy ways to get 9:1. I guess I need to figure out what my current compession is!

[screamin_c10]

Yeah pretty close to 9:1 SCR. I never really checked the old cranking pressure....never felt the need, she ran smooth as glass. Remember its not just the increased CR but the MUCH better chamber and increased valve size that make these heads great. There is absolutely NO comparison between the old 307's performance and its current level. Day and night.

I too was concerned about the sodium silicate until I watched them "kill" a couple cars. That stuff never has a chance to make it up to the heads, it does its dirty deed quick! Regardless I had the heads tanked and checked with no issues.

I did 2 sets one for the Chevelle engine with all the bells and whistles and then this stock set with a simple valve job. Both engines run great, sold me on the heads and its well worth getting a new intake.

The steel shims were a mistake, they are great on a freshly machined surface.

I am currently designing a single 3 inch exhaust to replace the existing stock y pipe and bomb. No telling what will happen once I lose that restriction, but one thing is for sure....it'll be fun.