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Are the cylinder heads on a 225 v-6 and 3/8l the same
1990 Buick Century

Are the cylinder heads on a 225 v-6 and 3/8L the same

(1990 Buick Century)
my engine is a 1965 225 v-6, looking for exhaust manifolds
Tags: buick, century
1 answer & 1 comment
Popular Answer
on April 26, 2019
The older year models *odd fire* 231 V/6 manifolds will bolt onto the 225 engine - however the later years with the *even fire* engines will not interchange.

The manifolds you’re look for are readily available from various parts stores or eBay.
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on April 26, 2019

I can’t recall the specific year the engine change came about.

[ I’d opt for new manifolds that FIT your vehicle ]

Hint: the *odd fire* engines had a weird looking spark plug wire placement on the distributor cap - like some wires were next to each other then it would skip a space in the firing order - once you’ve seen this setup - you’ll know the difference.

The later years are ported differently as well.
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on April 26, 2019
The older year models *odd fire* 231 V/6 manifolds will bolt onto the 225 engine - however the later years with the *even fire* engines will not interchange.

The manifolds you’re look for are readily available from various parts stores or eBay.
Sign in to reply
on April 26, 2019

I can’t recall the specific year the engine change came about.

[ I’d opt for new manifolds that FIT your vehicle ]

Hint: the *odd fire* engines had a weird looking spark plug wire placement on the distributor cap - like some wires were next to each other then it would skip a space in the firing order - once you’ve seen this setup - you’ll know the difference.

The later years are ported differently as well.

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