I have a 307 that is said to be all rebuilt, I was wondering / ***uming if/that all SBC parts ie, cams, timing, intakes, are interchangeable? what about heads, can they be changed to 350 2.02 heads without issue? Thanks ahead of time. the other questions I have, is there such a thing as a single quad tunnel ram intake for a sbc?
the Highlander is really fond of a good 307. We've had discussions because I was trying to land one but the dude decided he's going to put it in another truck. Someday...
Yes 350 2.02"/1.6" heads will bolt onto a 307. The 307 has a small bore though(3.875")and factory 2.02" heads are unshrouded around the intake valve. That makes a step in the cylinder/chamber area. Also if the heads have been resufaced alot or you are using a big cam the bigger diameter valve gets closer to the edge of the small diameter bore. It's usually not a problem but, i'm just mentioning it. The stroke in a 350 is 3.48" the stroke in a 307 is only 3.25" so with the shorter stroke you need a smaller chamber to keep the compression ratio up. 307s seamed to get a bad wrap. I kind of like them. They have the bore of a 283 and the stroke of a 327. I don't know what you're buildin' but I'd sell the 2.02" heads if they are factory 2.02"/1.6" to a number$ matching guy and use 327ci 1.94"/1.5" heads for the old look or 305 1.84"/1.5" if you want the bolt holes for acessories. Yep there are single four tunnel rams. Have fun,Smokey
Oh yea, If you are plannin' on usin' the tunnel ram and the 2.02" heads on your 307. Change your plans. With those big heads and that big manifold it may just be a big bogg at lower rpms. A stick shift trans with gear would help. It can be made to work but,it will take some tunnin'. Have fun,Smokey
The 307s are good engines, but check the stock Chevy cams, they wear lobes faster than you can say "wtf?" . I built one for a buddy, we kept the small heads and used a mild 216°/216° ( if I remember right) crane cam. I runs great and is quite torquey for a small motor. And it gets good gas milage too. It was just the right thing to make my friend´s 53 Panel a good daily driver. I´d use it.
Thanks for all the input, I didnt plan on changing the heads as the stockers should work fine, I want to put a medium sized cam in it, and the single 4 tunnel ram I want more for the look than anything else. I am putting it in a t bucket, should scoot it along just fine I think.
Basicly it is a 283 block with 327 crank.....but block and crank are large journal.......it should have around 74cc head on it.......i s****ed the heads off the one i have .......they ****s........and used early 60's power pack heads........if you don't mind the newer style intake and valve covers vortec heads work very well on them.....i just depends on how much you want to get out it.........and if you have a 350 block lying around you can swap cranks out to make it a 327.......same bore and stroke chevy used..........just keep it in mind when it is time to rebuild........
I've got a 307 in my '38 Ford pickup, and I like it. The price was right--free, brother-in-law gave it to me because it was in his way taking up space in his shop. He pulled it out of a '68 GMC pickup that only had about 30,000 miles on it but was rusted all to pieces. I did a quick and dirty ring job just on general principles because it had been sitting several years. I think the 307s in pickups had a better cam that gave them more low-end torque. I was pleasantly surprised to find a double-roller timing chain when I opened it up. Most of them had the skinny chain and nylon cam gear. The skinny chain and nylon cam gear was famous for jumping time. So if you find that setup, replace it with a good performance timing set. The original heads on my motor didn't have the hardened valve seats that you need for unleaded gas, and they also didn't have the threaded bosses in the front of the heads for mounting accessory brackets, so I used a pair of 262 heads (262 was used in '75-'76 Monza). I have a 600 cfm Holley on it. Probably more carb than I need, but it runs good. Not high performance by any means, but a decent running engine.
Used to be a T-bucket around here with a 307...stock shortblock & heads, except for a mild cam...had a tunnel ram with AFBs....15" McCrearys on the back...typical late 70's look...could pull the front wheels with no effort at all. Not so hard a feat when you considered the power/traction/front-end weight factors, but impressed the local redneck crowd nonetheless. If you buy a tunnel ram new, you generally buy the base & top separately, & you can still get single-four tops. However...I'd check eBay; they aren't as popular & a single-four ram is generally pretty cheap (it isn't worth the cost of buying used & then buying a new double-four top). 307s are good little engines, overlooked because they were always in land barges & were never offered with any kind of performance parts. Depending on what particular heads it has, I'd probably leave them- you likely won't see much gain from larger ports & intake valves unless it has one of the oddball heads from a 265 or something like. SBC parts do interchange....but if you happen to get late Vortec heads or intakes there are some issues to watch. Anything "before Vortec" will be fine as long as you pay attention to YEKOM's advice above.
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