Recent content by PRHeads

Actually, the 8 quickest FAST cars are run off in a pro-ladder elimination format(1 vs 8, 2 vs 7, etc). Winners of the pairings square off against each other until there is one left standing. Winner of the quick 8 is the overall winner of the event.

The moisture in the air can react with the carbon deposits on the valves and corrode them badly. At a minimum I would disassemble the heads and wire wheel the valves, and inspect them for any significant pitting. They’re often/usually pitted worse on the top(bowl side) of the valve. I just...

I think pretty much all the aftermarket aluminum heads for a BBM don’t have any exhaust heat crossover passage. Nor do most of the “better”(higher hp) newer intake manifolds. The intermittent lack of power being attributed to insufficient manifold heat doesn’t really make sense to me.

I like to set it up so the cover is just about touching the W/P housing……..so, whatever it takes to end up with that.

When using a stock timing cover and the Comp 204 rollerized button……..this is how I do it: The button is too long to fit under the stock cover, so I take two sockets(big one on the outside, about 3/8” bigger than the button on the inside), and hammer a “dimple” into the cover. Adjust as...

Actually, it was two orphaned heads that had the mate to each crack. I took the best parts from them and matched them up pretty close to each other. 346 heads. They had been run in a pair of S/G cars by two brothers. They both ended up making the swap to aluminum heads after they experienced...

When the RPM heads first arrived on the scene, I tested a ported set(basic mild full port)against some pretty nicely ported factory iron heads. This was prior to it being done by any magazines. Iron head combo was 11.0cr, RPM 11.5cr. Iron heads used 2.18” intake valve, 2.14” for the RPM...

One thing I’ve learned when trying to improve the performance of mild-ish combos that are using restrictive induction and exhaust is that a lot of the “conventional wisdom” hot rod techniques/parts don’t always pan out. As an example, prior to the circle track crate motor craze, one of the...

If you’re extra extra lucky, there aren’t matching broken teeth on the camshaft.

A little food for thought on the Stealth heads….. In the EM head shootout where they tested stock heads vs stealth vs rpm vs tf…….there was roughly a 20hp spread for each swap. If you do a more performance oriented valve job and blend the bowls on the stealth heads, you would wipe out most of...

With 516’s, It’s tough to make big improvements in flow, in the lift range of the cams you’re running, without resorting to bigger valves and/or a fair amount of porting. I feel it’s because of the rather flat floor and low SSR height, which allows the flow column to start skipping across the...

One reason I asked about the intake is, back when I was doing heads for some of the stock appearing guys I did a bunch of intake flow testing. You could make some decent improvements to the heads, but after you bolted a stock intake on it, you could lose like 80% of what you gained in the head...

That’s my take on it as well. Build it appropriately for the job at hand, and it’ll just make what it makes. Want more(seat of the pants) power without making it rowdier? More cubes is the answer imo.

Stock intake manifold? Any mods to it? Where did you run it? Empire, ESTA, or LVD?

In the Bullet lobe listing, the 220 did have more lift than the 225. Car looks great!! With equivalent work, I would expect 915’s to be better(in the car) than 516’s…….but probably not better enough to justify the swap. Do you have to drive it off the line, or can you just floor it without...