The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - engine hunting, what should I be looking for???

chevybuldr · 01-01-2009, 02:40 AM

With a 74cc head and a flat top piston with the piston about .010 below the deck you will achive about a 9.0 to 1 compression. A dish piston will get you an 8.0 to 1. 64cc head will put you over 10.5 to 1 and not good for the gas these days. I would stay at about 9.5 for what you want to do. So a good 74cc head and a forged flat top piston and you will be good.

01-01-2009, 02:40 AM	#60
chevybuldr Registered User Join Date: Oct 2008 Location: Livermore ca Posts: 699	Re: engine hunting, what should I be looking for??? With a 74cc head and a flat top piston with the piston about .010 below the deck you will achive about a 9.0 to 1 compression. A dish piston will get you an 8.0 to 1. 64cc head will put you over 10.5 to 1 and not good for the gas these days. I would stay at about 9.5 for what you want to do. So a good 74cc head and a forged flat top piston and you will be good.