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post #1 of (permalink) Old 12-08-2001, 01:58 PM
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350/305

I know that you can put some 351 ford heads onto a 302 but what about the bow-ties.
A buddy just wrote off his '71 chev and is looking at a '77 with a 305 in it. He wants to know if he can use any parts from his built 350 on the 305, ie, heads, headers, intake...
Are they interchangable engines with just a different crank?


'88 Sahara, 4.2 that runs thanx to every Cheap trick on this board. The rest is getting there![img]/wwwthreads_images/icons/blush.gif[/img]
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post #2 of (permalink) Old 12-08-2001, 02:02 PM
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Re: 350/305

thats the nice thing about chevy it's all the same

post #3 of (permalink) Old 12-08-2001, 02:05 PM
 
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Re: 350/305

You can use 305 parts on a 350, but it's not worth going the other way, (it lowers compression ratio and such) I'd just swap the 350 in (easy bolt up).

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post #4 of (permalink) Old 12-08-2001, 02:12 PM
 
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Re: 350/305

Actually, if he is going to play with it a bit, rather than mess around, have the 350 block machined to except a 400 crank and build up a 383 Stroker. One seriously nice engine. We've built a couple up, and they run GREAT! One did blow, one we had put together for a local construction company. The workers were playing with it, (85' Chev with a 12' flatbed, dual rear wheels, detroit locker) and managed to scatter it with less than 2,000 miles on it. Should have heard my dad (their mechanic) "explain" breaking an engine in and "not drag racing a work truck!" to them! My cousin also ran a 383 when he was racing for while. Good engine. Takes the 350 and makes it better.

"Fly low, fly fast, turn left!"--advice to new Reno Airracing pilots.
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post #5 of (permalink) Old 12-08-2001, 05:32 PM
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Re: 350/305

The parts from the 350 will fit on the 305, but it will mess around with the compression. I think that it will make the compression too low on the 305. The smaller CC heads that origionally came with it was what gave it what little compression they had. Adding a larger CC head will only make it worse. I'd stick with the 350. It's not too hard to change and has much much better performance.

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post #6 of (permalink) Old 12-08-2001, 08:20 PM
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Re: 350/305

The 305 and 350 have the same crankshaft stroke. There is a slight crankshaft balance difference between the 305 and 350, the pistons of the 350 are bigger and heavier than 305 pistons which means the crankshaft is weighted different. To see the actual weighted difference between a 305 crankshaft and a 350 cranshaft, a crankshaft balance machine is needed. There's really no sure way to tell the difference between a 305 and 350 cranshaft by just looking at it. The 305 and 350 crankshafts share the same casting number.

The connecting rods for a 305 and 350 are the same. Now for the heads, well there are differences besides just different combustion chamber sizes. Both 350 and 305 heads cast after the 1979 model year have 7 bolt holes for exhaust manifolds. Yes, only 6 of the 7 bolts are needed to bolt the exhaust manifold. Sometimes using 1980 and newer exhaust manifolds will NOT fit heads cast before 1979 because the spacing for the passenger side rear exhaust manifold bolt pattern needs the 7th bolt hole. Usually the 305 heads after 1980 have an intake valve size of 1.84". Usually the two barrel heads of a 350 before 1980 had intake valves 1.72". Usually the four barrel heads of a 350 before 1980 had intake valve size of 1.94".

If I were to build a 305, I'd try to find 350 heads that have intake valve 1.94" and a combustion chamber of 64cc. I'd use a .023" thick head gasket to keep the compression close to 8:1. If you use 350 heads that have 76cc combustion chambers with stock dish/type 305 pistons the compression ratio will be real close to 7:1 or maybe less[img]/wwwthreads_images/icons/frown.gif[/img].
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post #7 of (permalink) Old 12-08-2001, 09:44 PM
 
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Re: 350/305



<font size="5">Basic Engine Displacements &amp; Related Specs</font>
<hr>
<table border="1" bordercolor="#000000" bordercolorlight="#000000" bordercolordark="#000000">
<col width="51" style="mso-width-source:userset;mso-width-alt:1865;width:38pt">
<col width="63" style="mso-width-source:userset;mso-width-alt:2304;width:47pt">
<col width="39" style="mso-width-source:userset;mso-width-alt:1426;width:29pt">
<col width="48" style="mso-width-source:userset;mso-width-alt:1755;width:36pt">
<col width="95" style="mso-width-source:userset;mso-width-alt:3474;width:71pt">
<col width="88" style="mso-width-source:userset;mso-width-alt:3218;width:66pt">
<col width="64" style="width:48pt">
<col width="64" style="width:48pt">
<col width="64" style="width:48pt">
<col width="89" style="mso-width-source:userset;mso-width-alt:3254;width:67pt">
<tr height="17" style="height:12.75pt">
<td height="17" class="xl24" width="51" style="height:12.75pt;width:38pt">Engine</td>
<td class="xl25" width="63" style="width:47pt">Year</td>
<td class="xl26" width="39" style="width:29pt">Bore</td>
<td class="xl26" width="48" style="width:36pt">Stroke</td>
<td class="xl26" width="95" style="width:71pt" x:str="Main Journal ">Main
Journal Diameter
</td>
<td class="xl26" width="88" style="width:66pt" x:str="Rod Journal ">Rod
Journal Diameter
</td>
<td class="xl25" width="64" style="width:48pt">Main Bearings</td>
<td class="xl26" width="64" style="width:48pt">Cylinder Volume</td>
<td class="xl25" width="64" style="width:48pt">Rod Length</td>
<td class="xl26" width="89" style="width:67pt">Compression Height</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl32" style="height:12.75pt">262ci</td>
<td class="xl33">1975-76</td>
<td class="xl34" x:num="3.6709999999999998">3.671</td>
<td class="xl34" x:num>3.100</td>
<td class="xl34" x:num>2.450</td>
<td class="xl34" x:num>2.100</td>
<td class="xl33">2 Bolt</td>
<td class="xl34" x:num="32.811">32.811</td>
<td class="xl34" x:num="5.7030000000000003">5.703</td>
<td class="xl34" x:num>1.750</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl35" style="height:12.75pt">265ci</td>
<td class="xl36">1955-56</td>
<td class="xl37" x:num>3.750</td>
<td class="xl37" x:num>3.000</td>
<td class="xl37" x:num>2.300</td>
<td class="xl37" x:num>2.000</td>
<td class="xl36">2 Bolt</td>
<td class="xl37" x:num="33.134">33.134</td>
<td class="xl36" x:num="5.7030000000000003">5.703</td>
<td class="xl37" x:num>1.800</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">267ci</td>
<td class="xl39">1979-81</td>
<td class="xl40" x:num>3.500</td>
<td class="xl40" x:num="3.484">3.484</td>
<td class="xl40" x:num>2.450</td>
<td class="xl40" x:num>2.100</td>
<td class="xl39">2 Bolt</td>
<td class="xl40" x:num>33.520</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num>1.560</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">283ci</td>
<td class="xl41">1957-67</td>
<td class="xl40" x:num="3.875">3.875</td>
<td class="xl40" x:num>3.000</td>
<td class="xl40" x:num>2.300</td>
<td class="xl40" x:num>2.000</td>
<td class="xl39">2 Bolt</td>
<td class="xl40" x:num="35.398000000000003">35.398</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num>1.800</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">302ci</td>
<td class="xl39" x:num>1967</td>
<td class="xl40" x:num>4.000</td>
<td class="xl40" x:num>3.000</td>
<td class="xl40" x:num>2.300</td>
<td class="xl40" x:num>2.000</td>
<td class="xl39">2 Bolt</td>
<td class="xl40" x:num="37.718000000000004">37.718</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num>1.800</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">302ci</td>
<td class="xl39">1968-69</td>
<td class="xl40" x:num>4.000</td>
<td class="xl40" x:num>3.000</td>
<td class="xl40" x:num>2.450</td>
<td class="xl40" x:num>2.000</td>
<td class="xl39">2 Bolt</td>
<td class="xl40" x:num="37.718000000000004">37.718</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num>1.800</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">305ci</td>
<td class="xl39">1976-94</td>
<td class="xl40" x:num="3.7349999999999999">3.735</td>
<td class="xl40" x:num="3.484">3.484</td>
<td class="xl40" x:num>2.450</td>
<td class="xl40" x:num>2.100</td>
<td class="xl39">4 Bolt</td>
<td class="xl40" x:num="38.478999999999999">38.479</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num>1.800</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">307ci</td>
<td class="xl39">1968-73</td>
<td class="xl40" x:num="3.875">3.875</td>
<td class="xl40" x:num>3.250</td>
<td class="xl40" x:num>2.450</td>
<td class="xl40" x:num>2.100</td>
<td class="xl39">2 Bolt</td>
<td class="xl40" x:num="38.347000000000001">38.347</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num>1.560</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">327ci</td>
<td class="xl39">1962-67</td>
<td class="xl40" x:num>4.000</td>
<td class="xl40" x:num>3.250</td>
<td class="xl40" x:num>2.300</td>
<td class="xl40" x:num>2.000</td>
<td class="xl39">2 Bolt</td>
<td class="xl40" x:num="40.860999999999997">40.861</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num="1.675">1.675</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">350ci</td>
<td class="xl39">1967-01</td>
<td class="xl40" x:num>4.000</td>
<td class="xl40" x:num="3.484">3.484</td>
<td class="xl40" x:num>2.450</td>
<td class="xl40" x:num>2.100</td>
<td class="xl39">2&amp;4 Bolt</td>
<td class="xl40" x:num="43.802999999999997">43.803</td>
<td class="xl39" x:num="5.7030000000000003">5.703</td>
<td class="xl40" x:num="1.675">1.675</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">400ci</td>
<td class="xl39">1970-71</td>
<td class="xl40" x:num="4.125">4.125</td>
<td class="xl40" x:num>3.750</td>
<td class="xl40" x:num>2.650</td>
<td class="xl40" x:num>2.100</td>
<td class="xl39">4 Bolt</td>
<td class="xl40" x:num="50.139000000000003">50.139</td>
<td class="xl39" x:num="5.5650000000000004">5.565</td>
<td class="xl40" x:num>1.560</td>
</tr>
<tr height="17" style="height:12.75pt">
<td height="17" class="xl38" style="height:12.75pt">400ci</td>
<td class="xl39">1972-74</td>
<td class="xl40" x:num="4.125">4.125</td>
<td class="xl40" x:num>3.750</td>
<td class="xl40" x:num>2.650</td>
<td class="xl40" x:num>2.100</td>
<td class="xl39">2 Bolt</td>
<td class="xl40" x:num="50.139000000000003">50.139</td>
<td class="xl39" x:num="5.5650000000000004">5.565</td>
<td class="xl40" x:num>1.560</td>
</tr>
</table>
<hr>
<table height="49">
<col width="51" style="mso-width-source:userset;mso-width-alt:1865;width:38pt">
<col width="63" style="mso-width-source:userset;mso-width-alt:2304;width:47pt">
<col width="39" style="mso-width-source:userset;mso-width-alt:1426;width:29pt">
<col width="48" style="mso-width-source:userset;mso-width-alt:1755;width:36pt">
<col width="95" style="mso-width-source:userset;mso-width-alt:3474;width:71pt">
<col width="88" style="mso-width-source:userset;mso-width-alt:3218;width:66pt">
<col width="64" style="width:48pt">
<col width="64" style="width:48pt">
<col width="64" style="width:48pt">
<col width="89" style="mso-width-source:userset;mso-width-alt:3254;width:67pt">
<tr height="17" style="height:12.75pt">
<td colspan="10" height="20" class="xl24" width="665" style="width: 498pt; border-right: 12.75pt none height">Formula For Figuring CID Of An Engine:</td>
</tr>
<tr height="17" style="height:12.75pt">
<td colspan="10" height="21" class="xl27" style="border-right-style: none; border-right-width:></table>


0.7854 X Bore X Bore X Stroke X Number Of Cylinders = CID
<html>



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post #8 of (permalink) Old 12-09-2001, 01:57 AM
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Re: 350/305

So... the short of it is, his Edielbrock stuff like intake, carb and headers should be good, but swapping the heads is a waste of time. Personally I would do a 383 for myself if I got another truck but Daryl has a hard time keeping his cars running and on the road for very long so this won't be a build up. Thanks for all the quick responses![img]/wwwthreads_images/icons/smile.gif[/img]


'88 Sahara, 4.2 that runs thanx to every Cheap trick on this board. The rest is getting there![img]/wwwthreads_images/icons/blush.gif[/img]
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