with a tune you can count on one hand the low end loss if any. If 2bbl anyways. The 4bbl is a bit different story and is more of a traditional 4bbl single plane manifold. The 2bbl is fairly unique in style for a single plane and retains tq well. Ive towed quite a bit with mine. Dump trailers, cars, etc. Better than when it was stock

 

You have Flyin' Ryan's tune right? Was that a custom tune for your truck? Yes, the M1 is 2bbl.

 

it's a custom built tune that he developed and has setup to be reliable and safe on any stock to bolt-on truck. It's his canned tune option

 

Gotcha, thanks.

 

The only reason I said alternator it will be of anyhow. The crank seal I said to check because I was losing a little oil and couldn't figure out where. When I pulled the crank pulley you could see where it was dripping.

 

For some reason when you said crank seal, Rear Main Seal is what registered in my head. I replaced the crank seal on the timing cover about 5k miles ago.

 

I figured you might have when you did the timing cover. Well then I'd just get the heads ported and polished. Now if I was doing it I would pull the engine and paint it to

 

Yeah, I plan on paining the heads, but I don't think this engine will be getting painted. I've pulled engines out of these trucks before, and can do that. it would just take longer.

 

That FlyinRyan tune - does it work with regular fuel or does it require more octane? Also, if you plan to run the 2 barrel M1, you will notice a bit of low end loss, but you can work with it with the proper rear end gear ratio/tire size.

 

Stock tune is regular gas, some of the more esoteric tunes will want premium.

@1997JollyGreenGiant: M1, good heads, and HEADERS. (shorties) and a nice, free-flowing exhaust, coupled with a decent tune, and you will actually GAIN bottom end torque, from where you are at now. Very nice power bump.