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302 max bore

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Old Jul 10, 2025 | 05:02 PM
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From: Pelham Alabama
302 max bore

Just curious as to the max a 86 302 can be bored.
Found a nice engine but has been bored ,040

Any thoughts
Thank you
Alex
 
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Old Jul 10, 2025 | 06:41 PM
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That's about .010 past the recommended max, but you might get away with it. Being a later block it may be even thinner than the early blocks, which many back then had problems going .040. You could have it sonic checked ($$$), but personally, I'd hold out for a better one.
 
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Old Jul 10, 2025 | 10:59 PM
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How many miles on it at .040?

is it a recent rebuild that the guy just doesn't want? Or an older one that's half or more worn out? Or a recent one that overheats?
 
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Old Jul 11, 2025 | 08:06 AM
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.040 is the comfortable max.
 
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Old Jul 11, 2025 | 10:02 AM
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From: Pelham Alabama
Originally Posted by 85e150
How many miles on it at .040?

is it a recent rebuild that the guy just doesn't want? Or an older one that's half or more worn out? Or a recent one that overheats?
well,, GUY SAID he was building the engine for his 77 100,,, Guy came along and offered him stupid $$ for the truck.
This is a 1986 cobra roller engine.
Clean
Fresh bored
new pistons
Polished Alum dual plane
Mallory YL512CV Dist
And of course the Cobra V covers.
I really appreciate the feedback,,,, as I was also looking at a 64 Futura to run it in..
Thank you, Alex





 
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