Vetto1974 said: I also ask around about vortec heads. They told me because of the clearance issue, vortec heads, and vortec compatible intake will not work. What is your thoughts on this? How much hp is now your engine puts out? What ratios that your block and heads? Thank you
Vortec heads fit under the stock hoods, you just have to use the correct manifold and air cleaner. I used a GM manifold similar to this one except mine is a spread bore (bigger rear bores for the giant secondaries of a Q-jet carb)
http://www.ebay.com/itm/GM-Vortec-Dual-Plane-Intake-Manifold-Chevy-SBC-283-327-350-Fits-Vortec-Heads-/330832827129?hash=item4d072c52f9&item=330832827129&pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr
For the air cleaner, there are a number of options. I used a 2.5", 12" Dia. K&N. It's a tight fit under there, but they definitely do fit. I'd have a big hole in my hood now if they didn't! As for numbers, I estimate somewhere between 300 - 350 HP, based on comparing my specs for the specs on similar crate motors. My compression ratio is about 9.4:1. Have to use premium or at least mid-grade gas.
There are a number of issues that need to be resolved (even beyond clearance) if you do go with Vortec heads. You can search on this site for "Vortec" and come up with many of them. Feel free to PM me if you want more info.
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1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.