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It Is What It Is, Dude
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Cool writeup but I agree that it says nothing about the 3.5 being a short-stroke 4.5. It does hint to the fact that the 4.5 is a later variation of the 3.5.

That all gets me thinking... Aren't the heads and intake manifolds from a d-jet 3.5 and 4.5 interchangeable? That would mean that the top end of the motor needs to be identical. Do they have the exact same bore? Is the 4.5 stroke longer only at the bottom end of the engine? Or maybe a totally different angle?

I did like reading the writeup.


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It's been posted here and elsewhere that 3.5L cylinder heads have been installed on a 4.5L block resulting in higher compression due to the smaller combustion chambers. Given the obvious block differences as per electro's pics, which would make the span between the heads wider for the 4.5L, the intake manifolds will not interchange, you'd use the 4.5L D-Jet components on the 3.5L heads.
 

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Outstanding Contributor
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It's been posted here and elsewhere that 3.5L cylinder heads have been installed on a 4.5L block resulting in higher compression due to the smaller combustion chambers. Given the obvious block differences as per electro's pics, which would make the span between the heads wider for the 4.5L, the intake manifolds will not interchange, you'd use the 4.5L D-Jet components on the 3.5L heads.
Thanks. I had assumed that the intakes were also the same. It shows what happens when I Ass u Me.


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the 3.5 I bought new in Canada in '71 with a bit of the tons of cash from smuggling I had, ran rings around any of it's equals of the day. My dealer in Toronto said it's days were numbered, thoough, as the "new" 4.5s were coming - to compensate for loss hp from the anticipated future US smog rules. Sure enough, by '74 SLs were gutless wonders, whether stick or AT.

I'm sure all the under-40 remote -control experts here will argue, foaming at the mouth with uber-bravado, about everything written above - even probably where my commas should be.
 

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Outstanding Contributor , Bob's Your Uncle!
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I'm sure all the under-40 remote -control experts here will argue, foaming at the mouth with uber-bravado, about everything written above - even probably where my commas should be.
Tool Of The Day.
 
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