Does increasing compression increase horsepower? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Gregski** · 10-04-2015, 03:07 AM

I've been looking at Chevrolet crate motors, two in particular and am wondering why the one with lower compression has a higher horse power output? Doesn't increasing compression increase horsepower after all?

The two engines and their specs, the cams are different specs but both hydraulic flat tappet, I get it, but the heads seem very similar. Both have 76cc chambers and 1.94 intake / 1.50 exhaust valves. Not power related but FYI both have 2 piece rear main seals and 4 bolt mains.

10067353 Base 195/260 HP Engine
8.5:1 Compression
Heads - Part # unknown (similar to #882 castings)
Valve Springs - Part #3911068

12499529 290 HP Engine
8.0:1 Compression
Heads - Part #93438648/93438648
Valve Springs - Part #94666580

10-04-2015, 03:07 AM	#1
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,870	Does increasing compression increase horsepower? I've been looking at Chevrolet crate motors, two in particular and am wondering why the one with lower compression has a higher horse power output? Doesn't increasing compression increase horsepower after all? The two engines and their specs, the cams are different specs but both hydraulic flat tappet, I get it, but the heads seem very similar. Both have 76cc chambers and 1.94 intake / 1.50 exhaust valves. Not power related but FYI both have 2 piece rear main seals and 4 bolt mains. 10067353 Base 195/260 HP Engine 8.5:1 Compression Heads - Part # unknown (similar to #882 castings) Valve Springs - Part #3911068 12499529 290 HP Engine 8.0:1 Compression Heads - Part #93438648/93438648 Valve Springs - Part #94666580

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