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Old 07-06-2008, 07:55 PM
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Building a cheap street 307

Hey everyone. Got a new project 71 Chevy C10 A/C cab truck great condition for 850 bucks. Only problem is it had a 307. I wanted to throw in a stroked 350, but now for some crazy reason I think it'd be cool to see what I can do with the 307 it came with. Building it on a small budget. I took the 307 apart and it had the 882 heads which were cracked. Looks to be punched .40 over with flattop pistons. Stock crank. Bottom end doesn't look bad. Picked up a good set of 283 powerpack heads (which I need to tap for accessory holes) .They're a good set and were real cheap. Gonna pocket port em put a set of 1.5 roller rockers on. HEI ignition. Got a new flat tappet cam 480 lift/230 duration @.50. Double roller timing chain,springs,lifters,etc. Felpro gaskets. Edelbrock performer intake, Edelbrock 600cfm carb, dual exhaust, Magnaflow mufflers, 12 bolt posi, Not sure on gearing yet, TH350. Getting ready to put it all together and hopefully drop it in next week. Open to any suggestions or comments

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Old 07-06-2008, 09:41 PM
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Toooooo much cam for a 307. But half decent for a 350.

1 1/2 inch full tube headers, 2 1/2 collector 24 inches long, 2 1/4 mandrel exhaust.

Head quench distance of .040", use a thin metal gasket if necessary.

Lockup torque converter or better yet = OD trans.
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Old 07-06-2008, 10:18 PM
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Oops. Forgot to mention I've got the longtubes. You think it's too much cam even at only 230 duration @.50?
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Old 07-06-2008, 10:58 PM
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I'd agree that that is waaay too much cam.

I built a 307 that's in (oh, wait, not anymore) my Chevelle and initially used a 327 / 350 hp cam (222/222 duration, but with a 114 LSA). That cam was a lame duck with highway gears and stock stall. I took the wrong advice and didn't know any better. Sooo . . . I replaced it with a Summit 204/214 cam, and that was MUCH better. Still would've liked more gear, but I kept the 2.73s anyway, for budget and mileage. Got 22 mpg with headers, Eddie performer (600 cfm), intake and carb, and an HEI. This was all with the stock smog heads though, so your heads may help, but not too much. With a heavier truck you'll need some gear and stall to go, and I think that cam will be too much. I saw a build in super chevy where they used a 218/224 cam in a 307 with Edelbrock E-tec aluminum heads and got 315 hp though, so there is potential.

I pulled the 307 and am currently putting in a vortec 350 (got a great deal for cheap). I had cheap fun building the 307, and I'll probably use it later in an old ford I've got in the works, but the lower cube SBC is a lot more sensitive to overcamming. Pull that cam and put in something a lot smaller--you'll be happier on the street. Just my 2 cents!
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Old 07-06-2008, 11:46 PM
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Ok. I may look into getting a lil smaller cam. Messing around I found this video on youtube. It's a 307 and he's got a bigger cam than I was planning on!

http://youtube.com/watch?v=gF-Ggx7Ysnk
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Old 07-07-2008, 12:31 AM
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I like the ZZ top song. "Just got paid today, got me a pocket full of change."

That engine has a funny idle.
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Old 07-07-2008, 02:13 AM
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We had the question just the other day about drilling heads for accessory holes. Here's a link to the thread. Please click on the links I provided in my post so you can get both sides of the story before you start.
Drilling holes for accessory mountings-- can it be done?

The cam in the video was a 292H and you're correct, it is more cam than you are intending to use. One thing though, this was used with a manual transmission. You can get away with more cam that way by slipping the clutch from the git-go, because it certainly ain't gonna make any power down low. You can do it with an automatic too, by using a loose converter. But in order to make that kind of a cam work, you need some compression in the motor. For instance, to make the 230 cam work, you'd need static c.r. on the order of 10.0:1. And you'd need a tight squish (quench) of around 0.040" like Scot said.
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Old 07-07-2008, 03:18 AM
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Thanks for the info on drilling the heads. I noticed it was a manual tranny in the video. I was thinking a 3000 stall converter. To tell you the truth I have'nt even looked at what's on their now. I'll have to check how thin my head gaskets are. Possibly 0 deck the block
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Old 07-07-2008, 10:20 AM
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I would almost replace those heads with a set of World SR Torquers. They are stock for that size, have the accessory holes and they garuantee +30hp over stock out of the box. Another option would be to get a set of 416 casting heads off of an early 80's 305. Its one of the better flowing heads you can get once you get the ugly stock manifolds off it. There is a guy on Thirdgen.org who has those heads polished and ported with backcut valves on his 305 that's running 330hp.

You definitely want a 2.5" exhaust if you are running dual otherwise no less than 3" for a single pipe. Make sure you swap your springs when you put the new cam in otherwise you'll break something or bind it...either way, it's not good! hehe
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Old 07-07-2008, 10:29 AM
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that cam set up in the video sounds pretty good,but i am no expert on cams

Last edited by Longbox262; 07-07-2008 at 12:35 PM. Reason: add forgotton words
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Old 07-07-2008, 12:02 PM
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I was going to reccomend a 300 hp 327 cam, but I think you should take "307 Malibu's" advice, he's been there and done it.

If I were doing a 307 I would go with the 300 hp/327 cam I mentioned and Vortec heads. That cam should be real streetable in the little "stroked 283", and you wouldnt need to worry about the Vortec heads limitations, it would be a bolt up situation. Something like that should make gobs of torque for a 307 as well.
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Old 07-07-2008, 12:29 PM
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Quote:
Originally Posted by 65smallblock
I was going to reccomend a 300 hp 327 cam, but I think you should take "307 Malibu's" advice, he's been there and done it.

If I were doing a 307 I would go with the 300 hp/327 cam I mentioned and Vortec heads. That cam should be real streetable in the little "stroked 283", and you wouldnt need to worry about the Vortec heads limitations, it would be a bolt up situation. Something like that should make gobs of torque for a 307 as well.
Why use 45 year old technology?
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Old 07-07-2008, 01:09 PM
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Quote:
Originally Posted by ScoTFrenzel
Why use 45 year old technology?

All cams are old technology, but they still work..

As I said earlier, I would reccomend taking advantage of "307 malibus" hands on experience.
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Old 07-08-2008, 06:45 PM
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307

I Used A Comp Cam 270h Magnum Cam With Vortec Heads. On My 307. 224d@.050 .470 Lift. Worked Really Well.
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Old 07-08-2008, 11:42 PM
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Quote:
Originally Posted by 65smallblock
All cams are old technology, but they still work..

.

Don't worry about those old factory grinds.
Modern flat tappet lobe technology has come a long way in 45 years.

That 230 cam will push your peak to 6000 rpm and knock your low end in the head. Unless you plan to shift at 6500 and run a 3000 stall and get 11 mpg in a 307 ? It will need 10.5 compression too.

One magazine did an article titled "Love to Hate" about a iron head 305 that made 367 hp at 6100 rpm with a CC xe268h flat tappet. (224/230*)
But low end was weak below 3000.

307 should be better, shorter stroke and bigger bore.

Check PHR Engine Masters web site, maybe that's the place.

Last edited by ScoTFrenzel; 07-08-2008 at 11:49 PM.
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