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Old 12-14-2011, 07:13 PM
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Chevy 307 build

Hi I need some advise I am building a sbc 307 bored .030 over with flat top pistons and I don't know what head to use I was thinking of a 305 HO heads or camel hump heads. Got any sugestions?

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Old 12-14-2011, 07:23 PM
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We mostly use 416 heads off a 305. THe only issue now that you have it bored is the pistons have .020 removed off the tops. This kills compression and quench which hurts power. The correct compression height is 1.675, these pistons are 1.655. When you have the pistons installed move it to top dead center and check how far down in the bore they are. With these pistons it usually comes up at .045 or more which causes lazy combustion.
The only fix is to have the block decked. However you can run it this way, you`ll just have to remember, use the thinnest head gasket you can. Have the heads milled to assure flatness as it`s important with a thin gasket.
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Old 12-14-2011, 07:38 PM
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My pistons are flat top with 4 valve relief
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Old 12-14-2011, 07:41 PM
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Correct, they are, now check the compression height. Factory compression height is 1.675. The rebuilder pistons your using are 1.655
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Old 12-14-2011, 07:55 PM
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Ok I will, so what heads do you think I should use? I have both sets of heads and then I am using the famous 151 grind cam that was used in the 350hp 327
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Old 12-14-2011, 08:15 PM
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There are better cams than the 350 HP 327 grind. You're gonna need 10:1-plus CR and at least a 3500 RPM stall converter or a close ratio 4-speed w/4.56's. You can get by w/a wide ratio and 4.11's.
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Old 12-14-2011, 08:19 PM
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Ok well I have other cams I have a RV grind, a 268H and a comp cam 270h plus my truck has 3.73 gears and my 700r4 has a good stall and a shift kit
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Old 12-14-2011, 08:20 PM
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that is a terrible cam choice. you'll need heads with about 54cc Chambers if you want any computation st all for what appears to be an attempt at a high revving engine.
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Old 12-14-2011, 08:39 PM
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Well my 416 heads are 58cc with gasket match port, what cam should I run?
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Old 12-14-2011, 08:41 PM
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The vortec 5.7 heads with larger 1.94 intake valve are very good on a 307. Do not sell short with the smaller valve/runner 305 059 vortec heads. The 307 is classic powerplant that will move. Any 9+/1 compression sbc will make good use of the 1.94 valve. Try to maintain reasonable goals and it is fun.
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Old 12-14-2011, 08:51 PM
How fast is fast enough?
 
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A cam around 215-220 duration with as much lift as you can get. Single pattern with a wider lsa, 112 or so.
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Old 12-14-2011, 08:52 PM
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I don't have money in my budget to buy vortec heads, which of the two heads should I use, and what cam should I get?
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Old 12-14-2011, 08:55 PM
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Ok so around that duration, what head would you suggest?
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Old 12-14-2011, 09:04 PM
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If you can angle milling the camel humps down .150" and running them would be best. But it requires more than bolt and go. As is id run the 305 heads. With some porting and heavy milling the camel humps would be a much better head.
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Old 12-14-2011, 09:05 PM
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Thanks I have a friend that is selling me a new cam .454 lift on intake/exhaust
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