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#1 |
Registered User
Join Date: Sep 2006
Location: Bellwood, PA
Posts: 123
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My 307 Build Up
I just got finished with a rebuild / mod of my '69 C10 307 motor and I figured I would document what went into and the results here.
Parts List: (prices include shipping) #416 casting 305 heads: 1.84 intake, 1.5 exhaust, 58cc chamber -- $90 Used Edelbrock 1406 Carb (600 CFM) -- $50 Edelbrock RPM Performer 2101 Intake -- $80 Summit Racing Cam SUM-1103 (http://www.summitracing.com/parts/SUM-1103/) -- $55.00 Summit Racing Hydraulic Lifters (16) (http://www.summitracing.com/parts/SUM-HT817/) -- $50 Summit Racing SBC Gasket Set (http://www.summitracing.com/parts/SUM-G2600/) -- $30 Partial total: $355 Additional Parts that I used in the swap that aren't necessarily required: Motor Mounts (http://www.summitracing.com/parts/PIO-A2282/) -- $10 Oil Filter Sandwich Adapter (http://www.summitracing.com/parts/MRG-1272/) --$23 Chrome Steel Fuel Line (http://www.summitracing.com/parts/EDL-8126/) -- $20 Main Bearing Set (http://www.summitracing.com/parts/FEM-4663M/) -- $30 Rod Bearings (http://www.summitracing.com/parts/FEM-2555CP/) (8) -- $30 Timing Chain Set -- $20 HEI Distributor -- $80 Grand Total: $568 Cam specs: Duration at 050 inch Lift 214 int./224 exh. Advertised Duration 272 int./282 exh. Valve Lift with Factory Rocker Arm Ratio 0.442 int./0.465 exh. Lobe Separation (degrees) 112 As built, I calculated the static compression ratio to be 10.5:1 with a dynamic compression ratio of 9.33:1. These numbers may not be 100% accurate, but they should be pretty close. ![]() So far it is running great on 93 octane pump gas. The 307 I was building was using a press fit harmonic balancer with no center crank bolt. While the motor was out I went ahead and drilled / tapped the hole for the crank bolt (7/16 - 20). It made installing the balancer a lot easier than hammering it on or trying to locate a special tool. All of the loaner tools that I could find in chain stores required the tapped crank snout. I removed the fenders, hood, grill, and core support. This made the whole process much easier than it would have been otherwise. I pulled the motor without the tranny attached. Upon re-installation, I found that I needed to jack up the tail of the transmission in order get the motor to go in. I am loving the end result. I do not have any specs yet on actual horsepower or torque, but the seat of the pants results are enough to get 2 thumbs up in my book. It is a huge difference. The edelbrock is a piece of cake to get setup. I will be posting pics and hopefully video as well soon. Last edited by w3lfd; 12-08-2010 at 11:42 AM. |
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#2 |
Registered User
Join Date: Mar 2010
Location: Uniontown,PA
Posts: 39
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Re: My 307 Build Up
Why the 305 heads ?
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#3 |
Registered User
Join Date: Sep 2006
Location: Bellwood, PA
Posts: 123
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Re: My 307 Build Up
Smaller chambers than the stock 307 heads (58cc vs 64cc) brings the compression up. Also, the 305 heads are a close match with good flow for this motor.
Plus they are dirt cheap. Last edited by w3lfd; 12-06-2010 at 11:56 PM. |
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#4 |
Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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Great information
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John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS |
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#5 |
Registered Chevy Owner
Join Date: Aug 2008
Location: Snohomish, wa
Posts: 1,557
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Re: My 307 Build Up
What do you think about the 601 casting # 305 heads? They are 58cc. I was thinking it would be around 11-1 compression with those.
__________________
Love is fleeting, but Chevy trucks are forever!!!! ![]() 1970 Chevy CST C10 long box 350/400 ![]() 2008 Chevy Silverado short box 4x4 Had; 1951 Chevy short box 307/T5 1988 Chevy shot box 4x4 350/350 1971 Chevy C10 long box 4x4 350/350 1971 Chevy C20 long box 350/350 1971 Chevy C10 long box 350/350 |
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#6 | |
Registered User
Join Date: Sep 2006
Location: Bellwood, PA
Posts: 123
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Re: My 307 Build Up
Quote:
If it were 58cc, the 416 is 58 CC also, so I would guess you would get the same results as above. Gasket thickness will also affect the overall compression. If I went any higher on compression it would raise my dynamic CR, and I would probably be needing racing fuel or some sort of octane boost to keep the motor from pre-detonation. Last edited by w3lfd; 12-07-2010 at 12:14 AM. |
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#7 | |
Registered Chevy Owner
Join Date: Aug 2008
Location: Snohomish, wa
Posts: 1,557
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Re: My 307 Build Up
Quote:
__________________
Love is fleeting, but Chevy trucks are forever!!!! ![]() 1970 Chevy CST C10 long box 350/400 ![]() 2008 Chevy Silverado short box 4x4 Had; 1951 Chevy short box 307/T5 1988 Chevy shot box 4x4 350/350 1971 Chevy C10 long box 4x4 350/350 1971 Chevy C20 long box 350/350 1971 Chevy C10 long box 350/350 |
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#8 | |
Registered User
Join Date: Sep 2006
Location: Bellwood, PA
Posts: 123
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Re: My 307 Build Up
Quote:
Dyno simulators put it right around 300 hp and 385 ft/lb torque, but that is a far cry from putting it on a dyno. I don't trust the numbers from the simulator. |
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#9 |
I dun gradjiated collij!!!
Join Date: Jan 2006
Location: St. Helens Oregon
Posts: 1,751
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Re: My 307 Build Up
Did you consider 062 or 906 Vortec heads? I'm running the 1103 as well....gives the 'lil 307 a nice lope and a very nice power band. Were your pistons flat top 4VR or the dished ones?
__________________
Built NOT Bought. Viper Red 1971 LWB C10 355 Vortec W/700R4 4/5 drop AKA Screamin' You are missed!
2006 F150 XLT 5.4L Triton Rollin' on 22s the "F1" 67 C20 PS/AC/327/TH400 we call 'er "Bessie" 67 Malibu PS/ZR1-LS1 Brakes/350 Vortec/700R4 2/2 drop on 18" 338s - Tracy's "Boo" Boosted '67 Cougar EFI 5.0 HO roller motor/T5/8.8 Tracloc/ 4 wheel disks - "Project Panther" 79 Honda Z50 - stretched, cafe'd and hotrodded 125CC Lifan/5spd FEAR THE MONKEY! |
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#10 |
Registered User
Join Date: Sep 2006
Location: Bellwood, PA
Posts: 123
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Re: My 307 Build Up
The pistons were flat tops. Considered vortecs, ran with what I could find cheap to get it together. There is probably another head swap in its future, when I get bored again. Lol.
Last edited by w3lfd; 12-07-2010 at 12:26 PM. |
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#11 | |
I dun gradjiated collij!!!
Join Date: Jan 2006
Location: St. Helens Oregon
Posts: 1,751
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Re: My 307 Build Up
Quote:
![]() ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=429865
__________________
Built NOT Bought. Viper Red 1971 LWB C10 355 Vortec W/700R4 4/5 drop AKA Screamin' You are missed!
2006 F150 XLT 5.4L Triton Rollin' on 22s the "F1" 67 C20 PS/AC/327/TH400 we call 'er "Bessie" 67 Malibu PS/ZR1-LS1 Brakes/350 Vortec/700R4 2/2 drop on 18" 338s - Tracy's "Boo" Boosted '67 Cougar EFI 5.0 HO roller motor/T5/8.8 Tracloc/ 4 wheel disks - "Project Panther" 79 Honda Z50 - stretched, cafe'd and hotrodded 125CC Lifan/5spd FEAR THE MONKEY! |
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#12 |
Registered User
Join Date: Sep 2006
Location: Bellwood, PA
Posts: 123
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Re: My 307 Build Up
Well, here is some video. Not the greatest conditions out, but man do I love how it sounds:
Last edited by w3lfd; 12-21-2010 at 11:23 PM. |
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#13 | |
Scrapper 1
Join Date: Jan 2007
Location: Riverside Calif
Posts: 1,649
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![]() Quote:
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#14 |
Registered Chevy Owner
Join Date: Aug 2008
Location: Snohomish, wa
Posts: 1,557
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Re: My 307 Build Up
I can believe it though. Those are about my projections for my engine when I'm done.
__________________
Love is fleeting, but Chevy trucks are forever!!!! ![]() 1970 Chevy CST C10 long box 350/400 ![]() 2008 Chevy Silverado short box 4x4 Had; 1951 Chevy short box 307/T5 1988 Chevy shot box 4x4 350/350 1971 Chevy C10 long box 4x4 350/350 1971 Chevy C20 long box 350/350 1971 Chevy C10 long box 350/350 |
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#15 |
Registered User
Join Date: Jun 2010
Location: Upstate NY
Posts: 66
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Re: My 307 Build Up
Awesome!! I'm so glad you posted up results!
Your pistons are flat tops and not dished? Must be early motors got flat tops and later got dished? Do you know what the factory compression is supposed to be for your 69 307? Did you measure how far the pistons were down in the cylinders? Seems like they are typically deep in the hole on the 70's smog motors (.020-.030 on the motors I've measured) You're going to have to try harder to describe how much better it is!!!! Is it worth the effort and time? (looks like you got the budget part perfect) 30% better than stock, more? Does it press you back in the seat? Is the low end torque strong? Can you punch it and it pulls till 4000, 4500, 5000rpm? With that much compression, that cam should work really well! Stock manifolds, not headers? Did you have to do much carb tuning? What gears do you have? I'm lucky that I have a local dyno with wideband to tune the carb. If you can get to one, it is really easy to dial stuff in with a wideband. I'm concerned on my 71 307 build that 10.5:1 would be too much for heavy 2500lbs farm loads, even with 93. If I had more cam that would bleed off some of the cylinder pressure....but I need a lot of torque. Anyways your results are very encouraging! Keep us updated! Last edited by andymarkv; 12-07-2010 at 06:02 PM. |
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#16 |
Registered User
Join Date: Sep 2006
Location: Bellwood, PA
Posts: 123
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Re: My 307 Build Up
Yep, flat tops. Only slight valve reliefs in the top. Top of the piston was even with the plane of the block at TDC. I do know that my 307 (block 3956632) started out as the higher torque truck version of the 307 (200hp, 300 torque).
The build was definitely worth the time invested. It is like night and day on the performance. It also sounds much, much better. Before the workup, I could just barely break the tires loose by dropping the clutch. After, I can get it to break loose just by flogging it in 1st gear. The first test run I spun tire for 2 blocks until it dug in. I haven't hooked my tach up, but I can say that it pulls from the get-go right up through where I start to worry about running it too hard (guessing about 4500 rpm). Pulls hard through all the gears as well. The edelbrock carb needed the floats adjusted, but other than that it was cake. Best guess is it's running 3:73 gears. I never got around to confirming what it actually is. It is a stock 3 on the tree tranny and the truck originally came with the 307 so that is my best guess. Exhaust is the stock Ram's Horns. As a final note, I had a 1982 928, which was an automatic, and this truck seems as though it is a lot faster than that was. But you know how that goes. |
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#17 |
Registered User
Join Date: Jun 2010
Location: Upstate NY
Posts: 66
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Re: My 307 Build Up
Man that's what I wanted to hear!!
So cheap and easy! I have read a bunch of people say that the 307 can run pretty well with compression and cam. Just good to hear it from someone that has done it! Now I just have to keep watching for a nice set of 416's to come up! Probably the power difference in motors early and late are the flat tops and zero decked block. So my later 71 307 propably wouldn't gain quite so much compression. But I wouldn't know for sure until I opened it up. Since I already did the cam swap, this would be so simple for me! Pics and video would be great!! |
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#18 |
Registered User
![]() Join Date: Jan 2009
Location: marion nc
Posts: 588
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Re: My 307 Build Up
i have a set of these heads im gonna use on my 307. i heard about this setup from some local dirt track racers. like you stated these heads are easy to find and cheap. i paid 50 bucks for my set at a local junkyard. glad to see the great results great job. pics and a video would be sweet.
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69 short fleet 350/350 "under construction" 70 short step 307/3 speed |
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#19 |
Registered Chevy Owner
Join Date: Aug 2008
Location: Snohomish, wa
Posts: 1,557
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Re: My 307 Build Up
Nice!!!
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__________________
Love is fleeting, but Chevy trucks are forever!!!! ![]() 1970 Chevy CST C10 long box 350/400 ![]() 2008 Chevy Silverado short box 4x4 Had; 1951 Chevy short box 307/T5 1988 Chevy shot box 4x4 350/350 1971 Chevy C10 long box 4x4 350/350 1971 Chevy C20 long box 350/350 1971 Chevy C10 long box 350/350 |
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#20 |
Registered User
Join Date: Jun 2010
Location: Upstate NY
Posts: 66
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Re: My 307 Build Up
Very nice!!! Sounds really good, strong too!
Must be totally worth the effort! |
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#21 |
Registered User
Join Date: Aug 2009
Location: Red Wing Mn
Posts: 526
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Re: My 307 Build Up
I have a 307 also , I have a question about my Harmonic Balancer. I never noticed a Center bolt when i took it apart. I want to make sure that is one.
I also wanted to know if I have mine pressed in all the way, the distance from the timing cover seal to the part of the harmonic balancer that is not turned is about a 1/4 inch. This is my first build so I want to make sure im doing everything correctly, I used the proper tool to install until i couldnt turn in anymore. |
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#22 |
Registered User
Join Date: Nov 2010
Location: Alabama
Posts: 739
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Re: My 307 Build Up
It's really cool to see people build a 307. Not something you see everyday. Very cool!
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#23 |
Registered User
![]() Join Date: Jul 2010
Location: memphis
Posts: 2,537
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Re: My 307 Build Up
That sounds good
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#24 |
Registered User
![]() Join Date: Dec 2007
Location: Modesto, Ca
Posts: 411
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Re: My 307 Build Up
Wow. Nice write up. Just make sure that thing is not detonating. That DCR is mighty high for iron heads and pump gas. What were your quench measurements?
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#25 |
Registered User
Join Date: Nov 2008
Location: Glenville, Pa
Posts: 445
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Re: My 307 Build Up
Thanks for sharing! I'll keep this in mind when my 307 needs another rebuild.
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