401 rebuild

I have a set of KB pistons listed in the for sale section that would work for you.

Getting back to the pistons, I didn't plan on getting my block decked to run some wiesco pistions. I would be fine with a cr of 10:1 or 9:5:1. I'm installing this 401 in a 66 rogue with a close ratio T10 for primarly street use, by no means I want to cheap out on it (rambler mentality)but I don't want to go overkill.

 

SKeown wrote:    It's a stick shift 3300# car that years back ran 11.30's with a 10:1 395" solid flat tapit motor. So I figure being the whole car has been worked out better since I can get the 11.50's with less power via unported Eddy heads and Eddy dual plane AirGap. From what I can gather the out of box Eddy heads outflow the Crane prepped 69 S/S heads?     SKeown

.100 lift, intake 65 cfm,   exhaust 52  cfm

.200 lift, intake 130 cfm, exhaust 96  cfm

.300 lift, intake 192 cfm, exhaust 127cfm

.400 lift, intake 235 cfm, exhaust 163 cfm

.500 lift, intake 258 cfm, exhaust 182 cfm

.600 lift, intake 260 cfm, exhaust 190 cfm

 

Looks like the S/S heads are better until you hit about .400 lift.  Caveat - these weren't flowed on the same flow benches, so take this with a grain of salt.  Just like dyno's, some flow benches are more optimistic than others...

 

Scott

Edited by bulletpruf - May/03/2012 at 12:11am

SKeown wrote:    I just got a std bore 401 block and std crank, they'll be used for the flat tapit engine replacing my current engine once my performance goal is achieved. It will consist of Wiseco -27cc pistons, K1 rods, Eddy heads and air gap manifold. By decking the block .010 and surfacing the heads .005 that combo will produce 10.2:1 compression with .045 gaskets. I figure it will make a consistant mid 11 second bracket/street engine that won't require yearly maintenance and be tame enough on the street.    SKeown

Wiseco off the shelf 401 pistons are a great value particularly when considering they come with pins and rings and are excellent quality. Just remember that they are 1.500 compression height which is .008 shorter than stock so if you want to retain the .002 deck height you will need to take .008 of the top of the block.

At .030 over and if you take .010 off the block to have zero deck, compression will be at 10.38 which due to the flat top piston design and zero deck, seems to be compatible with premium pump gas. Your dynamic compression ratio, which is directly impacted by the cam specs, should stay in the mid 8s range.

Edited by amx39068 - May/02/2012 at 8:23am