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Quench is THE big deal. No quench, as with the pistons you have will kill the bottom end torque, throttle response, and fuel mileage. The speedmaster heads are a bargain in relation to correctly rebuilding a set of 50 year old heads. They are lighter, more powerful, and overall, a much improved...

Open chamber heads, a taller deck clearance, nonprojected tip sparkplugs, and thicker head gaskets require more timing than an optimized, tight quench area with a projected plug. Aluminum heads require more timing than iron heads due to them transferring more combustion heat into the water...

You don't need a hi output alternator unless u have efi and a big sound system. A quick revving 340 needs a larger diameter alternator pulley. That slows it down to where it normally RPMed with a stock engine. Gears and a stall convertor also needs a larger pulley. Stock alternator pulley ratios...

If a 72 Challenger tank fits I have one. TIMINATOR

Sirius XM.... TIMINATOR

Edelleyblock called it installation error. I guess the builder (not me) put the heads on upside down or something. I bought the engine (498") as an interim deal to repair and use between the 440 currently in my 72 Challenger (for sale soon), and the 512 real go fast motor that I havent had time...

Ya pays yer money and ya takes yer chances! TIMINATOR

Oops! That's a turbo Buick head...

Speedmaster has steadily been raising the quality of their parts for years. They admittly had some issues 15 or 20 years ago, but none lately with the parts I sold before retiring. Their heads and manifold have had zero issues in my experience for the last 20 years or so. Since we have been...

The LD4B will run rings around a performer intake. The as cast Speedmaster heads will out flow performer RPM heads. Forget the shorty headers, go with long tube headers, the torque/HP difference is a bunch, and small block fitment/clearance is not an issue at all. The short stroke 340 really...

The main thing these message boards have in their favor is peer review. It is important that if someone posts a "I heard this guy said it so it must be true," BS statement, he will, and should, get called out on it. There is a lot of MOPAR talent out there, we need to have a place for it! I...

Well... My 1972 Chevelle ran 10.80 @124+ with P/S, P/B, A/C, 3.73 gears and an off the shelf Hughes 3000 stall convertor at 3660 lbs (w/d) thru the mufflers on Hoosier 295/50 street treaded tires with a stock stroke, iron OVAL (ported) port 454 at 10.9 compression, Comp Cams 262/.651 solid...

I have looked at A and B and as here, no insult intended, most are obsessing about casting #s, date codes, and correct bolts. That's not my thing. I reimagine a car into what I want it to be, and then build that. Just so you all know that I am not insensitive to your ways, I have a large...

Thanks for the great feedback TIG! Mine is a lot calmer than your setups, but I will keep in mind everything you said. My Challenger is predominatly a street car that will only go to the track a few times. I expect it will run 9.80s or so on the motor, but it only has a bar and is only legal to...

Not being a snartaxx here, but are there any boards that are more oriented to FAST street and drag MOPARs? I have been looking around and haven't found a board to my liking. There are tons of resto boards, but that's not my thing. I'm looking for a board that the folks build and drive 10 second...

How much stall, trans brake? With stock stuff in your 727? I am a retired machineshop owner (40+ years), and have extensively used and installed heads, manifolds, alum radiators, fuel cells, rocker covers, roller rockers,, and more, from Pro Comp/Speedmaster during their time in business. The...

Has anyone had any experience with the Speedmaster billet planetary gearsets? They are 5 and 6 pinion straight cut 8620 steel and look good. Are they a standard ratio? They gotta be better than the stock stuff.? PCE 550-1010 I'm building a street, occasional strip 512 raised runner headed solid...

I'll have to jack up the car and see what I did on the "homemade" subframe connectors. I know I reinforced the area, but that was in 1996, for the customer that I bought the car from recently. I also moved the springs in parallel in the rear for more tire clearance. The goal is hi 9s on the...

Sirius XM wired to an FM radio in the glovebox. TIMINATOR

OK. Cool. Where do they mount? Front? Rear? Early moostang ones weld in on passenger side footbox front. Never heard of these for E bodies. Pics of them installed pls? I'm building a street brawler and am planning on reinforcing in a lot of places. Got a 6 point bar, and weld in subframe...