Speeds and reduces low to midrange cylinder pressure. Would be a dual pattern cam with slightly longer exhaust duration, theĪdditional valve overlap tends to bleed off cylinder pressure at lower engine Of intake duration with a lobe separation angle of 110 degrees. Smarter solution would be to select a camshaft with at least 218 to 228 degrees To prevent the engine from detonating on 91 octane fuel. You’ll will probably cause tuning problems as you try Problems depending upon the amount of initial timing and how quickly the Little overlap with 10:1 static compression ratio will likely cause detonation If the cam hasĪ somewhat conservative 200 to 210 degrees of duration at 0.050-inch tappet This is an older design, but still a decent head that would perfect for our 350.ġ0:1 compression the street is also dependent on camshaft timing. World Products makes a 64cc head called the Sportsman II with a 200cc intake port and 2.02/1.60-inch valves. This could be pumped back up to 9.87:1 with a 0.038-inch gasket. This would only drop our example 350’s compression by 0.3 of a point to 9.81:1. There are several aftermarket iron heads that feature combustions close to 64cc that would also work well.ĭart offers an Iron Eagle cylinder head with 2.02/1.60-inch valves with a 67cc chamber. This additional timing then contributes to While a larger chamber will reduce staticĬompression, a poor chamber shape will require more ignition timing to properlyīurn the air/fuel mixture. Chamber shape and volume have a bigĮffect on combustion efficiency. This iron head uses a nice, compact 64cc combustion chamber that benefitsįrom the very popular heart-shaped chamber. You decide to swap heads, a good OEM choice is the late 1990s Vortec truck Piston deck, that moves piston-to-head clearance to over 0.060-inch, which is Keeps the piston-to-head clearance fairly tight at 0.046-inch. This will increase the quench area, which reduces staticĬompression and also affects how well the quench performs. Production small blocks were built with the piston placed closer to 0.020-inchīelow the deck. Flat top pistons with 6cc of valve relief that sits 0.005-inch.Head gasket thickness, and piston valve reliefs (if present) or the presence ofĪ dish or dome in the piston. Static compression ratio is affectedīy multiple variables including crankshaft stroke, piston-to-head clearance, We’re talking about 91 octane premium gasoline.Īssume you are running a 4.030-inch bore. We’ll further qualify our answer with the assumption that With a 4.030-inch bore at that compression ratio on today’s rather poor pump Short answer to your question is that you should be able to run a small block Simple questions like this one often result in more complicated answers. Will that work on 91 octane pump premium fuel? I want to build a 350 Chevy with iron heads and a 10.0:1 compression ratio. This is often described as a heart-shaped chamber that reduces volume while improving combustion efficiency. Notice how the chamber pulls inward between the intake and exhaust valves. You can return any new or unused item within 90 days of the date your item was shipped and we will refund the full purchase price.This is a tight shot of a 64cc combustion chamber in an iron Vortec head. Visa/Mastercard, Discover, American Express, Pay Pal, and Pay Pal Credit, Gift Cards, Summit Racing SpeedCard. Have questions? Our customer support team is available 7 days a week to help you. We’ll beat any advertised price on an in-stock product. We're confident our prices are the lowest. Over 1 Million parts from more than 1000 trusted brands, more parts added all the time. We ship in-stock parts via ground shipping the same day if ordered by 8:00 pm EST. Just place an order over $109, and we'll drop the shipping and handling charge.
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