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  #16 (permalink)  
Old 04-28-2013, 05:24 PM
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Quote:
Originally Posted by DoubleVision View Post
The 5.565 rods are fine to use in a 307 with the 3.250 inch stroke.
This gives it a rod ratio of 1.7:1 which is good for a street engine.

If you went with Vortec heads, had the block decked .012 and used a GM 4 inch bore .028 compressed thickness head gasket you would land right at 9.5:1 compression ratio which is ideal for the street on pump gas.
It would also put the quench distance at around .041 which is also ideal.
Run a dual plane Vortec intake and a Quadrajet on top, with small tube headers and a summit hydraulic flat tappet cam with .214 Duration @.050
and .440 lift, tune it up with the best pieces you can afford.
What you'll have is a strong running street 307 with outstanding throttle response and good fuel economy to boot.
That would give him a what 320 ish cid ? Like I said a short rod stroker but I didn't think about using a big journal 327 crank. I had to go mow instead of doing math. He would have the only one in the county. I like that.

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  #17 (permalink)  
Old 04-28-2013, 05:31 PM
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Quote:
Originally Posted by DoubleVision View Post
The 5.565 rods are fine to use in a 307 with the 3.250 inch stroke.
This gives it a rod ratio of 1.7:1 which is good for a street engine.

If you went with Vortec heads, had the block decked .012 and used a GM 4 inch bore .028 compressed thickness head gasket you would land right at 9.5:1 compression ratio which is ideal for the street on pump gas.
It would also put the quench distance at around .041 which is also ideal.
Run a dual plane Vortec intake and a Quadrajet on top, with small tube headers and a summit hydraulic flat tappet cam with .214 Duration @.050
and .440 lift, tune it up with the best pieces you can afford.
What you'll have is a strong running street 307 with outstanding throttle response and good fuel economy to boot.
ok how is a stock 307 stroke crank with a shorter rod(5.565") going to get any compression with a 307 piston with a compression height for use with a 5.7" rod.. ??
the piston will be so far down the hole at TDC it's not even funny .. EVER IF HE , OFFSET GROUND THE CRANK, ofset grinding the crank will only get you so far
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  #18 (permalink)  
Old 04-28-2013, 05:54 PM
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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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Old 04-28-2013, 06:48 PM
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Thanks for clearing that up. It's been 30 years since I had a 307 apart and I was thinking 3" stroke for some reason. Got rid of 307's as soon as I could. I admitt I should have looked up the numbers. Even with a stock crank he very likely have the only one in the county. They've all gone to the scrappers around here.

Last edited by tresi; 04-28-2013 at 06:53 PM.
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Old 04-28-2013, 07:05 PM
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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.
HE IS USEING 400 CID RODS THAT ARE SHORTER THAN THE 307 RODS.
and the factory 307 stroke.. you can't just take the 307 5.7" rods and drop 5.565 400 rods in and it work.. the stack is to short.. how are you making up the .135 that the stack is now short..
even shorter with rebuilder 307 pistons..
do they even make 283 pistons in the bore size he wants to run?

oh and I'm a fool now too..

Last edited by gearheadslife; 04-28-2013 at 07:11 PM.
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  #21 (permalink)  
Old 04-28-2013, 07:42 PM
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I hope he is talking about using 283 pistons which will work fine.

1/2 the stroke= 1.625
rod length = 5.565
283 piston CH = 1.78
______

8.97

.030 shy of a 9.00 deck height but, maybe he can find some 1.805 CH pistons
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Old 04-28-2013, 08:10 PM
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I'm using 283 pistons. Replacement 307 pistons have a compression distance of 1.655. The 283 piston I'm using has a compression distance of 1.779. Using .015 head gaskets, 60 cc heads, and milling the block .025 I'll have a 9.61:1 compression ratio and a .046 quench height. That will please me
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Old 04-28-2013, 08:16 PM
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Will your intake manifold mating surfaces will sit flat taking .025 off the block without machining either the intake surface of the heads or the intake manifold?
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Old 04-28-2013, 08:38 PM
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why an exotic 307? using stock everything else and buying good pistons sounds easier
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Old 04-28-2013, 08:42 PM
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It will affect the intake mating surface, but with an aluminum intake my machine shop guy can get it back true fairly easy.
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Old 04-28-2013, 08:47 PM
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why an exotic 307? using stock everything else and buying good pistons sounds easier
Theres no such thing as good 307 pistons
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  #27 (permalink)  
Old 04-28-2013, 08:55 PM
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Originally Posted by ss307 View Post
It will affect the intake mating surface, but with an aluminum intake my machine shop guy can get it back true fairly easy.
That's what machinists do. Do you know if the block and/or heads have been resurfaced in the past? Have you cc'd the heads? They should be 56 - 58 cc's if not cut.
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Old 04-28-2013, 09:09 PM
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That's what machinists do. Do you know if the block and/or heads have been resurfaced in the past? Have you cc'd the heads? They should be 56 - 58 cc's if not cut.
The heads have been resurfaced. No I havent cc'd them. Heres the question now-Do I use flat tops and mill the block .025 to have a maximum of 9.8:1 ratio. Or do I leave the block alone and use 4cc domes(these pistons are over $300 more). Compression would be at or a little over 11:1. Would pump gas do the job?
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  #29 (permalink)  
Old 04-28-2013, 10:15 PM
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My choice would be stay under 11:1 c.r.
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Old 04-28-2013, 10:30 PM
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wiseco/mahle and others

Quote:
Originally Posted by ss307 View Post
Theres no such thing as good 307 pistons
custom pistons can usually be supplied by any manufacturer.Just ask. The 366 sbc ,393 sbc, etc all had to have special made pistons at some time.Stroker 283s have been around since before GM offered them in the mid sixties
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