![]() |
|
![]() |
#1 |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
307 engine rebuild ?
Has anyone rebuilt their 307 engine ? How much horse power did you get outta it. I was told a 307 is a 283 block with 327 crankshaft. Do you guys think it's possible to get 400 HP out of the rebuild, What's the most you can get outta this engine. I'm thinking of a 383 long block swap, I know for sure I can get 400 HP with an engine from Summit Racing or Jegs High Performance, Was looking a Blueprint engines, What are you opinions. It will probably cost me over 4 grand going with Summit or Jegs, been looking at their long blocks.
|
![]() |
![]() |
![]() |
#2 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,915
|
Re: 307 engine rebuild ?
How fast can you afford to go? SuperChevy did a 307 build and got 315 HP out of it:
http://www.superchevy.com/how-to/eng...e-performance/
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
![]() |
![]() |
![]() |
#3 | |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
Re: 307 engine rebuild ?
Quote:
|
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
|
Re: 307 engine rebuild ?
307 and 400hp? Nope. go 350 or 383, preferably one piece seal and roller cam
|
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
Re: 307 engine rebuild ?
...Yap that's where my thinking is headed, I looked at more than a few engines on Summit and Jegs, I'm looking to swap over from my 307 the eldelbrock dual plane intake manifold with the eldelbrock 650 carb and Sanderson Ceramic coated mid length headers.
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
Re: 307 engine rebuild ?
I'll try to post the link to one of the engines I'm considering, Don't have a computer, Doing this with a Note 9 phone, BTW I'm not tech savvy LOL.
|
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
Re: 307 engine rebuild ?
Here's one of the engines I'm considering, What do you guys think. Gonna mate it up to the 350 TH trans that's already in there, Yah I rather have a 700r4 but I already spent alot of money on this truck, Most of which is the CPP upgraded suspension, Trailing arms, I still have to change out the Cab and Radiator mounts, and install Sway bars front and rear. Almost forgot the rear end pretty much has gone though, changed from stock 3.73 Ring & Pinion to 3.42, one axle had to be replaced because of bearing wear into the axle
https://www.summitracing.com/parts/mll-bp3834ct1/ Last edited by Ventanakaz; 09-01-2019 at 04:57 AM. |
![]() |
![]() |
![]() |
#8 | |
Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
|
Re: 307 engine rebuild ?
Quote:
Better off with this one - https://www.summitracing.com/parts/m...3ct1/overview/ |
|
![]() |
![]() |
![]() |
#9 | |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
![]() Quote:
![]() |
|
![]() |
![]() |
![]() |
#10 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
|
Re: 307 engine rebuild ?
Do you need 400hp? Have you driven true 300hp? people today are caught up in the numbers when 300hp is more than adequate and quite fun to drive... unless you are jaded. I built a 307 many years ago for a K/20 4spd work truck. It got up and down the road along with or ahead of everyone and when out 4 wheelin' in the mud wringing her out the guys were always asking "What do you have in there?". "307" always raised their brows and loosened their jaws. It also got 13mpg all day long
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
![]() |
![]() |
![]() |
#11 | |
Registered User
Join Date: Jun 2012
Location: Portland
Posts: 1,330
|
Re: 307 engine rebuild ?
Quote:
If your goal is to cruise or get around town, build towards that goal, and 300hp is probably enough. But if you're like me, like the feeling of acceleration and speed, then that 307 is never going to satisfy you. But it's also a can of worms, as once you get into higher power you'll want the brakes, tires, and suspension to handle it. That's pretty much why I always do the engine last in my builds, as I want to ensure the rest of the vehicle can keep up once the power is there. |
|
![]() |
![]() |
![]() |
#12 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,915
|
Re: 307 engine rebuild ?
If you're going to spend all that money, I'd start with a true GM Vortec block.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
![]() |
![]() |
![]() |
#13 | |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
Re: 307 engine rebuild ?
Quote:
|
|
![]() |
![]() |
![]() |
#14 | |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
|
Re: 307 engine rebuild ?
Quote:
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
|
![]() |
![]() |
![]() |
#15 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
|
Re: 307 engine rebuild ?
400hp i really doubt it without radicle parts. 383 aint worth the trouble........ Go 350 2 or 4 bolt main block, a whole lot cheaper. Have you considered a gm crate engine... Hard to beat the prrice plus you get a gm warranty.........
__________________
I BELIEVE IN JOHN 3:16 |
![]() |
![]() |
![]() |
#16 |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
Re: 307 engine rebuild ?
Yap whatever I choose it will have to be a 4 bolt main, Yah your probably right about the 350
|
![]() |
![]() |
![]() |
#17 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
|
Re: 307 engine rebuild ?
2 bolt main blocks hold alot of potential, dont sell them short. All 283,s n 327,s are 2 bolt blocks and just look at there capabilitys...... Remember the 327/365hp engine............ Your not building a pro stock all out race eng...............YOUR GONNA HAVE A HEART ATTACK WHEN YOU PRICE EVERYTHING OUT..
__________________
I BELIEVE IN JOHN 3:16 |
![]() |
![]() |
![]() |
#18 |
Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,594
|
Re: 307 engine rebuild ?
I helped a friend build around a 325hp estimated 307 years ago with the then practically new Vortec heads. It was in a C10 with 3.42 gears.
I had 9-9.25-1 CR, roller rockers, comp 268 cam, high rise dual plane, and his preferred 600 cfm Carter. It was on nice motor, and never gave up. 400hp is doable, but would cost more to hit there. A 350 would be cheaper, and get more easier. The short bore hurts potential. Idle was a bit choppy, but came.on hard at 2500 to 6500. Do to valve float. Other then that it was nice. Last edited by Ziegelsteinfaust; 09-02-2019 at 01:18 AM. |
![]() |
![]() |
![]() |
#19 |
Registered User
Join Date: Mar 2014
Location: oak harbor, wa
Posts: 3
|
Re: 307 engine rebuild ?
you could do a LS swap for the price you would pay to get 250HP out of a 307!!
|
![]() |
![]() |
![]() |
#20 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
|
Re: 307 engine rebuild ?
I helped a friend build around a 325hp estimated 307 years ago with the then practically new Vortec heads. It was in a C10 with 3.42 gears.
I had 9-9.25-1 CR, roller rockers, comp 268 cam, high rise dual plane, and his preferred 600 cfm Carter. It was on nice motor, and never gave up. 400hp is doable, but would cost more to hit there. A 350 would be cheaper, and get more easier. The short bore hurts potential. Idle was a bit choppy, but came.on hard at 2500 to 6500. Do to valve float. Other then that it was ni YOUR DREAMING...................
__________________
I BELIEVE IN JOHN 3:16 |
![]() |
![]() |
![]() |
#21 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,151
|
Re: 307 engine rebuild ?
A bit of information here for the open minded.
https://www.jalopyjournal.com/forum/...07-tech.45615/ Nice truck by the way. ![]() ![]()
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 Last edited by HO455; 09-02-2019 at 11:02 AM. |
![]() |
![]() |
![]() |
#22 |
Senior Member
![]() Join Date: Apr 2001
Location: Alexandria, MN
Posts: 1,462
|
Re: 307 engine rebuild ?
307s are IMO great engines. They get a bad rap, but from a physics standpoint, have a great rod/stroke ratio and with a nice set of heads, machining for a true flat top piston that creates an ideal quench and resulting flame pattern, educated cam selection, tuned carb, distributor, intake and exhaust combo, and ideal gearing can be a lot of fun when you hit the loud pedal AND get better than average MPG numbers for a truck! Remember, gotta look at everything as a package vs. a 400HP engine made to hit peak HP at 5800RPM and 2.73 gears and a 700r4 overdrive will make you question your confidence as a car guy
![]() --Mike
__________________
63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's |
![]() |
![]() |
![]() |
#23 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
|
Re: 307 engine rebuild ?
I agree 307,s are really good. I use them in a lot of sbc army truck conversions I do but in basically stock setup. I don't think you can run 2.02 int valves because it will hit the top of the block though
__________________
I BELIEVE IN JOHN 3:16 |
![]() |
![]() |
![]() |
#24 |
Registered User
Join Date: Jun 2012
Location: Portland
Posts: 1,330
|
Re: 307 engine rebuild ?
With the commonality and availability of a 350, there just isn't a lot of reason to sink money into a 307, aside from wanting to be different (which is totally legitimate). Just seems like anything you can do with a 307, you can do cheaper and in most cases better with a 350.
But hey, I say the same thing (at least about doing it better, maybe not cheaper) when it comes to the Gen I vs. LSx debates, so perhaps I just don't have enough fond memories of these engines. |
![]() |
![]() |
![]() |
#25 |
Registered User
Join Date: Apr 2019
Location: California
Posts: 53
|
Re: 307 engine rebuild ?
I appreciate everyone's input and it is helping me with my decision, I definitely won't be having my 307 rebuilt and at first I was thinking 350, then started thinking the 383 stroker, Now I'm back to my original thoughts of 350, I'll try to post another engine that I was just looking at last night (to get your opinions) It's a 350 with under 400 HP, I feel for me and the truck with what I want, That the Torque numbers would be more important. This is the only engine I found so far with my search, that not only has a roller cam but also roller rockers. (Edit) I'll try to post a link so you can read up on it. (Edit 2) Have any of you know anything about ATK engines ? I have been outta the loop for a hell of alot of years, Back in 82 I was a Machinist for a few months at my stepfather's shop. Loved it at that time :-)
Last edited by Ventanakaz; 09-02-2019 at 11:38 PM. |
![]() |
![]() |
![]() |
Bookmarks |
|
|