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Discussion Starter · #1 ·
Will 1985 318 heads work on a 1978 318 short block? Also I would like to know if 1985 360 heads will work on a 1978 short block? would I need to modifiy anything?
 

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the 318 heads should work. the only ones i think are different are the magnum heads so the older ones shold bolt right on.. same with the 360 heads but i dont know if the chamber size is different or not...
 

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u will needa 360 intake . the 318 intake has smaller ports on the 4bbl .
 

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Discussion Starter · #4 ·
I was told the motor in the rc was a 318, found out the truck came with a 360. If I put 318 heads on a 360 would this work or not? I have looked at the numbers and thought it said 318 but was in a hurry and could have mis read them. so if any one knows if 1985 318 heads would work on a 1978 360 short blocklet me know. the pistons were tapping the sparkplugs just enough to close the gap and short the plug.
 

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Why are you wanting to change the heads? 318 heads will physically bolt onto a 360 but the ports are much smaller and there will be a considerable power loss above 3000 rpm.
 

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Discussion Starter · #6 ·
One of the valves on the heads that came on the rc was shot. It still ran, but pritty bad. I put a set of 1985 318 heads on it and the pistons are hiting the plugs just enough to close the gap. Just tring to figure it out.
 

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Yeah in my youth I wouldnt listen to my dad who is a mechanic and put my 360 heads on a 318 and found it was more of a dog than putting the 318's on the 360 but either way there is a mismatch in chamber size along with some other differences.
 

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Something else is going on with the spark plugs. 360's pistons sit too far in the hole to even come close to hitting the plugs. What plugs are you using?
 
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