Technical 75 Spider 1800 2000 engine parts swap for +BHP

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Technical 75 Spider 1800 2000 engine parts swap for +BHP

accentphotography

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I am trying to decide what parts to use to build a stronger 1975 1800 engine. I just bought a NEW 1800 complete short block for $500 and I am confused about what head to use? Do I stay with the original head and just get it rebuild and add a performance cam, dual 40 Webers, and a free flow exhaust, or do I put on a 2000 head? I know where there is a ported and flowed 2000 head for about $350 and although I was not planning on getting this head, I was not sure if the 1800 and 2000 heads give the same compression and flow. I will take any suggestions. I am new to a Fiat and so far I love it. Since the car will be a daily driver, I have decided to make the engine, suspension, brakes and electrical like new.
 
One easy way to produce more hp, since you seem to have access to the parts would be to use a 2000 block with an 1800 head. The added displacement comes from a longer stroke, so you may see some added compression as well as hp. The top end of your rpm range will be slightly lower ( 200 ?) but with the power gain you may see it as a good trade off. good luck!
John
 
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