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Topic Review (Newest First)
06-26-2013 09:23 PM
77racing
307-360 stoker

put in a 383 crank with custom 30 over pistons and ull have a torque monster 360 stroker--any combination of good parts ie heads intake rods crank and cam will get u there--its also very important to open up all the oil gallies and champfer the top of the cylinder block so it breaths better
05-08-2013 10:13 PM
vinniekq2 crower makes good cams. The reason I said 220 duration,was to give the little engine a chance to breathe at higher RPMs.The lower ICL║ was to keep cylinder pressures up while using a little bigger cam.The heads you have are not known for big flow numbers so the bigger cam may crutch this problem a little.
The smaller crower cam will work fine. Bolt it in and make some noise! good luck
05-08-2013 08:10 PM
ss307
Quote:
Originally Posted by techinspector1 View Post
You started off saying +0.060" on the block bore. What size is it now? If it's stock at 3.875", could you back down to boring it +0.030" instead of +0.060"?
Is the block deck height stock right now at ~9.025"? You said the heads have been cut. Do you know how much?

By the way, if Crower posted an operating range of idle to 6000 on any of their cam grinds, then shame on them. An engine may operate from idle to 6000, but it will not make useable power from idle to 6000 with any one camshaft. The camshaft operating range, where it makes power, is normally 3500 to 3800 rpm's, like from idle to 4500 or 1000 to 4800 or 1500 to 5300 or 2000 to 5800 or whatever. I just wanted to make that clear so that others reading this thread will not get the wrong idea and think there is something magical about Crower cams that permits them to make power over a 5200 rpm range (idle to 6000).
The block is already .060 over (9.375"), and the heads have been resurfaced, not sure how much though, I haven't measured them. I plan on having the block decked .010. I hope everybody reading this thread knows better than that.
05-08-2013 01:31 PM
techinspector1
Quote:
Originally Posted by ss307 View Post
I've decided to sell the 400 rods and use 5.7" Eagle rods with Keith Black 307 Flat Top Pistons(283 pistons have to high of a compression height to use with the 5.7 rods and the 307's 3.25 stroke). I'll have a 10:1 CR with the 416 heads. I'm using a Weiand 7504 intake and a Holley 600 CFM. What cam should I use? I can't make up my mind
You started off saying +0.060" on the block bore. What size is it now? If it's stock at 3.875", could you back down to boring it +0.030" instead of +0.060"?
Is the block deck height stock right now at ~9.025"? You said the heads have been cut. Do you know how much?

By the way, if Crower posted an operating range of idle to 6000 on any of their cam grinds, then shame on them. An engine may operate from idle to 6000, but it will not make useable power from idle to 6000 with any one camshaft. The camshaft operating range, where it makes power, is normally 3500 to 3800 rpm's, like from idle to 4500 or 1000 to 4800 or 1500 to 5300 or 2000 to 5800 or whatever. I just wanted to make that clear so that others reading this thread will not get the wrong idea and think there is something magical about Crower cams that permits them to make power over a 5200 rpm range (idle to 6000).
05-08-2013 12:04 PM
ss307 I haven't heard much of Crower cams. How about a Crower 210HR215?

Basic Operating RPM Range: Idle-6,000

Intake Duration at 050 inch Lift: 212

Exhaust Duration at 050 inch Lift: 218

Duration at 050 inch Lift: 212 int./218 exh.

Advertised Intake Duration: 284

Advertised Exhaust Duration: 288

Advertised Duration: 284 int./288 exh.

Intake Valve Lift with Factory Rocker Arm Ratio: 0.462 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.470 in.

Valve Lift with Factory Rocker Arm Ratio: 0.462 int./0.470 exh.

Lobe Separation (degrees): 110
05-08-2013 08:04 AM
vinniekq2 I would use a roller hydraulic with specs around 22o duration @050.The icl @104║,,,,but I would try to lower CR to 9.5:1. .500 lift would work well and have good street manners
05-08-2013 07:43 AM
ss307 I've decided to sell the 400 rods and use 5.7" Eagle rods with Keith Black 307 Flat Top Pistons(283 pistons have to high of a compression height to use with the 5.7 rods and the 307's 3.25 stroke). I'll have a 10:1 CR with the 416 heads. I'm using a Weiand 7504 intake and a Holley 600 CFM. What cam should I use? I can't make up my mind
05-02-2013 05:58 PM
vinniekq2
better?

Quote:
Originally Posted by naphtali5725 View Post
can you give an opinion of a better design... I have an Olds 455, and that thing is expensive to build...
The LS engines are more powerful.Please say what would be better to you?
05-02-2013 02:37 PM
ap72
Quote:
Originally Posted by naphtali5725 View Post
can you give an opinion of a better design... I have an Olds 455, and that thing is expensive to build...
Just about any popular engine designed from the late 70's on, and many before that.

My first engine was a 350 Olds- yet another case of a better design.

It really all depends on what you want, mileage, displacement, durability, etc. Plenty of options to choose from.
05-02-2013 11:48 AM
naphtali5725
Quote:
Originally Posted by ap72 View Post
no, everyone has one because they're cheap. There are are many far better engine designs than the sbc, but they're not even close when it comes to price.
can you give an opinion of a better design... I have an Olds 455, and that thing is expensive to build...
05-02-2013 11:39 AM
ap72
Quote:
Originally Posted by naphtali5725 View Post
Not trying to be different, just wondered if that is the route to go to get a 327 without being able to find a 327 block, since i don't seem to be able to find one...
I'm aware of a well built 350 being able to handle abuse, that's why everyone has one...
no, everyone has one because they're cheap. There are are many far better engine designs than the sbc, but they're not even close when it comes to price.
05-02-2013 11:27 AM
naphtali5725 Not trying to be different, just wondered if that is the route to go to get a 327 without being able to find a 327 block, since i don't seem to be able to find one...
I'm aware of a well built 350 being able to handle abuse, that's why everyone has one...


Quote:
Originally Posted by ap72 View Post
You CAN go this route, but why?

To be different you may as well just go for the Chevy 302, for power there's no reason to not go with at least a 350. A well prepped mostly stock 350 short block can take more abuse than people realize, with sbc's the limiting factor is usually cam and valvetrain, NOT stroke.
05-02-2013 07:38 AM
ap72
Quote:
Originally Posted by naphtali5725 View Post
Hello DoubleVision,
Can you take a 350 4 bolt block and put in a 307 crank and 5.7" rods, That will basically make a 327 correct?
In doing so what pistons should be used with edelbrock heads to get max comp ratio for pump gas, flat tops?
What would the best distance be in the hole for the pistons? zero?

Kind regards
You CAN go this route, but why?

To be different you may as well just go for the Chevy 302, for power there's no reason to not go with at least a 350. A well prepped mostly stock 350 short block can take more abuse than people realize, with sbc's the limiting factor is usually cam and valvetrain, NOT stroke.
05-02-2013 03:30 AM
DoubleVision Yes, You can throw a 307 crank in a 350 block and it makes a 327.
With 5.7 Rods you would use 327 pistons with the 1.675 Compression height.
It would depend on the combustion chamber size of the heads. If they are
64cc's a flat top design would work nicely on pump gas. If the heads are aluminum then you can run higher compression on pump gas due to aluminums ability to dissipate heat quicker.
You can even use the 307 crank in a 1 piece rear seal block, however you'll need the 1 to 2 piece seal adapter. However if you go this route with the
307 crank, I recommend you have the crank balanced since the 327 used heavier pistons than a 307.
05-01-2013 05:35 PM
naphtali5725 Hello DoubleVision,
Can you take a 350 4 bolt block and put in a 307 crank and 5.7" rods, That will basically make a 327 correct?
In doing so what pistons should be used with edelbrock heads to get max comp ratio for pump gas, flat tops?
What would the best distance be in the hole for the pistons? zero?

Kind regards


Quote:
Originally Posted by DoubleVision View Post
Tres, the 307 came from the factory with the same stroke as a 327 which is 3.250. The 307 was created by merging the 283 bore and the 327 stroke.
Gearheads, the idea would be to use a piston with higher compression height to compensate for it, such as the pistons out of a 283. I used to keep up with all the tricks but since I never come across any 307's I didn't care to remember. When building a performance 307 there's one problem we run into and that is the pistons. The stock compression height 307 piston from the factory is 1.675. The hyper aftermarket pistons are 1.655, so as you see they whacked .020 off the compression height. The majority of cheapy "rebuilder" pistons are made this way. That is why we use the shorter rod and a 283 piston which has a higher compression height due to it's shorter stroke.
When you look at my post count I hope you realize I didn't start turning wrenches yesterday. I say that because if I didn't know by using a shorter rod would cause all kinds of deck problems I wouldn't even bother to be on this site and I sure as hell wouldn't answer any questions based on something I know nothing about and make myself look like a fool.
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