Thumper 401?

[tarior]

Also to doublecheck I plan to take it to a muffler shop to see if the catalytic converter is bad after 8 yrs. (How else would I diagnose this?)

Michael[/quote]

Take it off and look inside

[shimniok]

Okey doke... I think I can probably handle that!

[tarior]

The cat on my Nissan truck was plugged, I fixed it right up with a sleever bar It flows great, now! Of course, there is no emissions testing where I live.

[shimniok]

Actually I guess I can't take it off... it's welded in... I s'pose I'll just take it to an exhaust shop for a look...

[Dallas Lemon]

I have recently finished the buildup of a 401 and installed it into my CJ7. The machine work was done by Heads By Paul in Englewood, and they did the normal 30 over and 10 under, balance, and supplied a 260H cam. Eutectic pistons were used with the stock CR. I decided to go with the Edelbrock heads instead of having the stock heads worked over, and using the Edekbrock heads increases the CR to 9.5 to 1 with the stock bore. All I can say is HOLY SMOKES! My CJ weighs in at around 4500 lbs. It has 4:56 gears and 37" MTRs. This engine has an incredible amount of torque. I was running a 360 that was stock except with a Performer intake and a 260H cam. This 401 may have as much as twice the HP the 360 had. And easily twice the torque. I contribute most of the power gains to the heads. If your 360 is in good condition, I would suggest installing as set of Edelbrock heads on it. You can use them on the 401 if you decide to swap down the road. You will not regret it!

[jeepsr4ever]

Eddy heads do rock!

[shimniok]

I still have a hard time believing the 260H is the pinnacle of cams based on the Desktop Dyno output. I wonder what I'm missing...?

The Edel. heads sound great... probably way more $$ than I can afford, but c'est la vie.

Michael

[tarior]

I've had good results with the 268H. I REALLY like the Crane 272/282. Streetable, VERY strong midrange.

[Dallas Lemon]

I still have a hard time believing the 260H is the pinnacle of cams based on the Desktop Dyno output. I wonder what I'm missing...?

The Edel. heads sound great... probably way more $$ than I can afford, but c'est la vie.

Michael

My goal for this 401 was to have a a strong bottom end with decent power at mid range. The bottom end is much stronger than I expected, and the mid range is very strong! I can see now that I could have gone with a more radical cam and still would have good bottom end. As far as the 260H being the "pinnacle of cams", it depends on what you are going for. I was very pleased with that cam in my 360 and therefore decided to use one in my 401. I am not a high RPM high HP kind of guy. My CJ is built for the rocks, and the way it performs is exactly what I was building it for. My best guesstimate is it is easily making 350 HP, and maybe 400. The torque numbers have got to be 450, and it is making it at 3000 RPM or less.

[shimniok]

Hm... what altitude are you at? I'll post when I find the root cause behind my poor power. I have a 360 with 260H. Maybe it is something other than the cam.

Desktop Dyno (see graph earlier in thread) shows the 260H is mediocre 2000-3000. Maybe that is because all the power is below 2000rpm?

Michael