The ignorant BS'ers can be quite entertaining
05-06-2014, 03:44 PM
#21
Race Director
It's a SB400, bored .030 and stroked .100.
In the "old" days of modifying SB400 engines, it was fairly common to offset grind the rod journals down to small journal size on a 400 crank to achieve the additional stroke of .100in. This, with the .030 bore, gives about 418. With a .040 bore, you get 420----------------------which is what I have in my jet boat.
Right now, the SB400 in the 56 is only bored .030. But when it comes time for a rebuild, I'm going to open it to 420.
In the "old" days of modifying SB400 engines, it was fairly common to offset grind the rod journals down to small journal size on a 400 crank to achieve the additional stroke of .100in. This, with the .030 bore, gives about 418. With a .040 bore, you get 420----------------------which is what I have in my jet boat.
Right now, the SB400 in the 56 is only bored .030. But when it comes time for a rebuild, I'm going to open it to 420.
05-06-2014, 04:24 PM
#22
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That SBC hemi looks incredible. I had no idea.....
However, Chevrolet wasn't the only outfit to consider the possibility of a hemi conversion. Here is one with definite "Ardun" overtones:
Jim
However, Chevrolet wasn't the only outfit to consider the possibility of a hemi conversion. Here is one with definite "Ardun" overtones:
Jim
05-06-2014, 04:29 PM
#23
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I hope this isn't hijacking the thread, but it seems like a "fluff" one so I will chime in about the Hemi heads. I am not mechanically inclined but have been reading up and trying to have a basic understanding of how engines work. Am I misinformed, or is there very little advantage to Hemi engines? Seems like a lot of hype. My apologizes to any Mopar guys here.
05-06-2014, 05:31 PM
#24
Melting Slicks
There's nothing inherent to it...my (long gone) Ford Focus had a hemi. In the US it was called the SPI engine, but in Europe it was the CVH...guess what the H stood for! And no, it was grossly underpowered even for a car that size.
05-06-2014, 05:46 PM
#25
Race Director
Thread Starter
The advantage to the hemi was the valves were usually positioned such that the air flow had a pretty straight shot in from the intake manifold,a nd a straight shot out to the exhaust manifold, without flow restricting bends in the runners, and centrally located spark plug for a uniform cylinder burn without a need for quench area.
Now, you can have a hemi head that doesn't have straight shots to the runners, or a centrally located plug, so a hemi doesn't automatically make more power, there are probably more poor hemi head designs than good ones.
Doug
Now, you can have a hemi head that doesn't have straight shots to the runners, or a centrally located plug, so a hemi doesn't automatically make more power, there are probably more poor hemi head designs than good ones.
Doug
05-07-2014, 06:29 AM
#26
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Wow, didn't know that about the Chevy hemi, very interesting, and the 418. I try to read every post because I usually learn something from each of them. Of course, remembering what I've learned is another matter...