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Old 03-10-2013, 09:58 PM
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numerical alphabet soup

well here i am again, looking for more facts and opinions... they're both pretty good around here.

my replacement motor 14088548 mid 80's goodwrench 350

heads on said motor 14102187 305????? crappy heads from what i can gather

old heads from 327 3927186

now the ultimate goal was to replace the intake, valve covers oil pan and a few odds and ends and throw the 350 in my 66 impala just so i can drive it this summer while i come up with a more permanent solution to the early death of my 327. i didnt want to have to pull the rockers off or tear anyhthing down just a quick swap over. my problem is that all the exhaust bolts were broken off i was able to heat and remove all but 1.. which snapped off flush with the head. so i drilled it for an easy out which then broke off in the hole got the torches back out and was able to remove the broken piece and some of the old bolt but i messed up the area around the edge of the bolt hole, its a little bigger than it was before im hoping to install a helicoil for a repair but if the head is damaged beyond repair i was wondering if my other heads would work with this block? the other question is can i have 305 heads on a 350 block?

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Old 03-11-2013, 05:48 AM
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Dang! 100 views and no response.

It's so much fun removing broken exhaust studs and my customers can't figure out why I get $25.00 + per to do them..
Yes the 305 heads will work for your intended purpose. They will raise the 350 compression a bit. But those engines could use a little extra.
Many 350 engines of the eighties era were rebuilt using 305 heads. This was a time that good 350 head cores were in very short supply (still are) to rebuilders, due to GM production using 882-624 castings that were about 90 percent cracked.
Special pistons are listed by the manufacturers for this purpose. But the stock low compression 80's piston will do in most cases.
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Old 03-11-2013, 08:16 AM
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im on a highway to hell
 

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thank you bob,

now i know that the 350 block and 305 heads combo did exist. im not surprised seeing that the motor was already together and in a truck i just wanted to make sure the numbers were right in my mind.

the other heads from my 327 were from 1970 will they fit the mid 80's 350 to? im assuming they will work unless gm made some type of change to the block design im not aware of.
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Old 03-11-2013, 08:50 AM
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They will fit. But be aware they are not compatable with unlead gas. If the car is seldom used thats is not a problem. But if it actually has to work on a daily basis. The lack of hard exhaust seats will lead to valve seat recession and cracking.
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