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Topic Review (Newest First)
01-26-2012 11:37 AM
lojack I am in the midst of redoing a 307, its out of a 68 gmc half ton, and its possibly for my 17 year old neice, so jam isnt an issue. Also its the original motor and theres somthing to be said for keeping things original if hp isnt what your looking for. That being said, when I dropped the block off to get hot tanked, the guy that I was nuts! He said this is either a 283 or 307, I said 307 he said they were smoggers lol. and I should just do a 350, but I kinda expained the situation and he said oh ok. I dunno if he agreed with my reasoning though, but hey whatever,
06-26-2008 01:49 PM
lg1969 Jake, With the price of gas going up your better off cleaning the 307 install 1.94 heads and get a cam that will give you torque. I had a 307 in my chevelle and got 18 miles per gallon. I was using a Q-jet carb. It ran pretty strong.
06-26-2008 03:22 AM
307 engine.

A friend of mine had a 307 in his 55 chevy back in the 70's with a two barrel that thing would get after it after he replaced the clutch I ran him in my 70 GTO from the start he would hang with me but after a little bit I was gone I really liked that engine it took a beating he ran it with out a air filter and towards the end of when he had it the car would use 15 quarts of oil on a 350 mile trip it was funny because once he would hear the engine make a certain sound he would pull over and add 5 quarts of oil but she held up.
04-27-2008 10:18 PM
venolia made custom pistons

Originally Posted by machine shop tom
Even 2 years ago to now, nobody makes a piston to work with a 3.75" stroke crank and a 3.875" nominal bore. If they did, it would be a 359 at .030" over.

yes, its does make a 359.47 cid engine, the pistons i have are from venolia
they are for a 3.905 bore, 6" H beam rod and a 3.75 crank ground to 350
specs AKA a 383 stroker crank, the engine combination was built
by a engine builder for a guy running a dragster who tried to
set a class record as the block casting denoted that it was a 307
engine but was busted during a tear down. i purchased the rotating
assembly from a guy who was running it in a dirt limited late model
but went to a 434 cid engine
04-24-2008 10:09 PM
TooMany2count This is where I got my info from when putting my 307 together. I also used a Crane Cam.....joe
04-24-2008 08:42 PM

i had a 307 in my 70 nova also. what i did was i got a set of vortec heads. mine came off of a 97 tahoe. i used a compcams 270h hyd. flat tappet cam. it gives it a nice little rumble. for my intake i got a summit stage one duel plane intake. and a edelbrock 650 carb. hei ignition. i was surprised how much that thing pulled. i did that because the bottom end was still good. but if you have to rebuild it put the money in a 350.
04-24-2008 07:31 PM
machine shop tom
Originally Posted by ap72
yea for some damn reason I though the 307 had a 3.48" stock stroke.. brain fart.
I hate it when that happens to me.

04-24-2008 07:19 PM
ap72 yea for some damn reason I though the 307 had a 3.48" stock stroke.. brain fart.
04-24-2008 06:51 PM
machine shop tom
Originally Posted by ap72
just use a 400 rod length
The pistons will hit the head.

04-24-2008 03:54 PM
ap72 just use a 400 rod length
04-24-2008 02:52 PM
machine shop tom Even 2 years ago to now, nobody makes a piston to work with a 3.75" stroke crank and a 3.875" nominal bore. If they did, it would be a 359 at .030" over.

04-24-2008 01:16 PM
Double_v23 I am sure everyone from 2 years ago will be happy to hear how your project goes.
04-24-2008 12:39 PM
SUPERSTOCK66X the use of a 3.75 crank and a 6" rod makes a smokin engine
combo a friend of mine used this combination in a dirt stock car
with great success i just bought the rotating assembly from him
and will get started on the block clearancing will let you know how
it goes
09-26-2006 08:50 AM
ap72 use a 3.75" stroke crank (400 or 383) to get your displacement up. The smaller bore and longer stroke would be perfect for a truck.
09-26-2006 02:00 AM
brandon624 I know what you mean about building something different, and I'm guessing you don't have a 502 caddy just lying around. 307s are fun to play with, but if I was hauling a load or pulling a trailor I would want at least 350 cubes under the hood. That said, 307s are cheap and fun to build because they respond well to smaller parts that most people don't want. 305 1.84 valve heads work well with their small chambers and larger ports, and are very cheap on ebay. Same for 283 powerpack heads. These heads will choke a 350 but are just right for a 307. The best setup I've had on mine so far is 461 camel humps w/1.94s and .030" milled off, edelbrock c3bx intake that was virtually left for dead in my garage, duntov 30/30 solid cam, and 600cfm carb. I've rebuilt this motor several times, and I'm finding out the smaller I go the better it seems to run. No single plane intakes, 2" spacers or 750 carbs. Also, you'll either want to get an msd blaster2 coil or replace points dist with an HEI.
Friend of mine had one in an 80s camaro with a saginaw 4spd behind it. When he got it revvin it would plant you in the seat. Definitly liked the 4spd. We seen the car at the track a few years after he sold it, and found out people had been passing it off as a 327.
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