Head Differences

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08-23-2004, 05:34 PM

DeWynter

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Head Differences

What is the difference between the L98 heads and the HO 305 TPI Heads on 90' + f-bods

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08-23-2004, 06:13 PM

Stekman

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Car: Z28

Engine: Sb2.2 406

Transmission: Jerico 4 speed

Axle/Gears: Ford 9" 3.60

The L98 heads (083 casting) have 64cc chambers and 1.94/1.5 valves. The 305 TPI heads (081 casting) have 58cc chambers and 1.84/1.5 valves.

There are no such things as "high output" 305 TPI heads. "HO" status is achieved by higher compression and the camshaft for the most part.

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08-24-2004, 03:39 PM

DeWynter

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I'm sorry I didnt make my self more clear, I did not mean that the Heads were HO, I ment the engine they come from is a HO 305 from a 1990 formula WS6

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