Heads C302B

The heads he is refering to are aluminum Motorsport "high ports".I don't think a manifold change will solve your problem.A stock exhaust maybe.Or you could swap back to stock stuff and sell the good stuff to me CHEAP!LOL

C-302B heads are arguably the best cylinder heads ever developed for the 351-C. At one point in the late '80s they were THE premier NASCAR & dirt-track racing cylinder heads. Not only are the intake/exhaust ports shifted radically for much better efficiency, they knock 60 lbs of high-mounted weight off the engine, for better handling. Only matching racing intakes will fit but any Holley will mount up. I ran early versions (so-called A-3 heads) with a hydraulic cam & a 600 Holley vac-sec carb on the street for years, before switching to a 700 mech-sec Holley. The vac-sec Holley gave 19mpg on multiple trips to 'Vegas but ran out of power at 6000 rpm; dunno what the bigger carb will do. Those heads & intake are estimated to sell used & fully assembled for maybe $2500 and be worth 30-50 horses on an identical short block. Due to superior cooling, they tolerate an extra 1.0 point of compression on 91 octane fuel: I run 10-1/4:1 with little problem..

The neighbor's have no reason to be "scared". For God's sake!!!

I am a little new to this. Who made these Heads. Does't look like a Ford part nimber. What are the Specs?

Aluminum stagger-valve heads are sold by Ford-SVO racing. All nine varieties were different in flow characteristics and port sizes, beginning with the A-3s in 1983. Valve sizes varied too, and the heads all require single-groove valves & springs that are strong enough to follow the cam but not to exceed 350psi closed pressure or the stellite seat inserts will pound into the soft aluminum. The springs also need spring cups to protect them from the springs digging in. All the heads are closed-chamber. Comression will vary depending on the series head, from 15-1/2 to 10-1/2:1 with flat-top pistons. The heads feature shifted intake & exhaust ports, so much so that a stock-type intake won't line up either ports or bolt holes. The racing intakes (from Ford-SVO) are the only ones that fits & they only come in a few varieties, mostly in carb height. The carb is shifted backward toward the decklid and upward so a stock engine screen won't fit. The intakes are all open plenum (except one) & flat with no carb tilt. The exhaust ports are moved upward 2-1/2" and have a different bolt pattern than stock headers. Custom aftermarket exhausts are available from a few vendors for the Pantera. The latest version head used today in Winston Cup racing, the C-3L, has more problems for street guys. These heads will only accept a Jesel shaft-mounted rocker arm set (at $950), and NO intake will bolt on; most guys either run EFI and a separate valley cover, or fabricate an intake from scratch. Naked heads sell for around $850 ea, and by the time they have ss valves, guide plates, springs etc, you have another $500 in each. Oh yes- they are also thicker than stock heads so your head bolts won't fit; studs are available. The extra thickness creates some geometry problems unless custom length pushrods are used, and after all this, it's be a shame not to use full-roller rocker arms...and LOTS of money.