PDA

View Full Version : Rockcrawler 401 buildup


Bulltear Ad
Bulltear Ad

401cj7
02-29-2004, 04:25 PM
I am in the process of building a 401 for my cj7. For this project I want the power band from 1500-4500 rpm range. What should I do to the heads for max hp in this range, or should I go with new edelbrock heads?I want to see if anyone could tell me the estimated hp with this setup. Also I have a set of 2380 .30 trw pistons will these give me a true 10:1 ratio with 58 cc heads? What is the highest compression ratio I can run on 93 octane? Which intake should I use performer or air gap? Any other suggestions

401 .30
DUI ignition
2380 .30 pistons
Head work?
holley 770 truck avenger carb
K&N air cleaner
comp cams 270H
headman headers
performer or air gap intake

78304CJ-7
02-29-2004, 05:00 PM
I am in the process of building a 401 for my cj7. For this project I want the power band from 1500-4500 rpm range. What should I do to the heads for max hp in this range, or should I go with new edelbrock heads?I want to see if anyone could tell me the estimated hp with this setup. Also I have a set of 2380 .30 trw pistons will these give me a true 10:1 ratio with 58 cc heads? What is the highest compression ratio I can run on 93 octane? Which intake should I use performer or air gap? Any other suggestions

401 .30
DUI ignition
2380 .30 pistons
Head work?
holley 770 truck avenger carb
K&N air cleaner
comp cams 270H
headman headers
performer or air gap intake

Regardsing the pistons, I will tell ya right now you are going to want to open your head uo to drop the compression. I just ripped apart A 401 with the same pistons and 3 of the wrist pin bores had proeblems due to detonations (this wasntt my engine) 10:1 with that style pistons isn't a good idea unless you keep your timing way back <35* IMHO.

-RJ

Bulltear Ad