There's definitely better cams. Comp23-227 is a very good choiceThanks for the help everyone! If I go aluminum heads I will definitely pick a cam to take advantage of them. That cam is from the build I linked so it’s not set in stone that’s what I will run.
Nope. Not me. Never in my life have I run a Thumper cam. Not my style.The thumpr is 227-241@ .050 and
480's-.490's lift. But with stock rockers lift is more like .450's and .460's.
LCA is 107
This is the cam used in the link I posted above. I believe IQ52 did that build?
Nope. Not me. Never in my life have I run a Thumper cam. Not my style.
Sorry bout that! I apologizeNope. Not me. Never in my life have I run a Thumper cam. Not my style.
That's the same build as the one I posted. Brian @ IMM Engines (The builder, IIRC he goes by OU812 here and on Moparts) was concerned about the stock rockers, the better heads definitely helped, if I were starting out now I'd wait for a set of the TF 240 heads and use the Mancini branded rockers. They are the best "stock" replacement heads right now, with plenty of room to grow. **Edited and updated**400 BB Mopar budget dyno test***MORE PICS
I think this looks like a good build? I’m assuming those were the KB240s and I would more than likely run Stealth aluminum heads. So it should make good power and be streetable and run on pump gas. Given the car is heavy I will obviously put lower gears in it. If I wanted to go on the highway for a trip or something no biggie to swap pumpkins. Think I will base the build off of this. I’m assuming the aluminum heads would help????
I was going to mention that as wellI'm posting this as another option, and some data:
I built a 400 using the stock crank, albeit forged, and had the rod journals ground to 2.200 (BBC) used 6.800 rods with the Icon IC828 piston with a compression height of 1.485. The block was decked to 9.965, so the pistons were .010 proud. With a Cometic .045 gasket, that's about as tight as you can get for piston/head clearance. 452 iron heads, with a good value job and some blending, flow as 240I/200E at .500, surfaced until they were flat, and average of 3 chambers was 89cc. Calculated compression is 9.0:1, runs fine on 91 octane, under all condition so far. Cam was an Erson hydraulic roller, 231/237 at 050, 112 LSA, used with solid roller lifters and .008 lash, per Erson. There were some issues with the hydraulic roller lifters and I needed to put it together. Made 435HP and 440ft-lbs of torque with an out of the box Holley 750 vacuum secondary card and basic Performer intake, minimal tuning. Has 20 inches of vacuum. I'm sure there's a lot left to be found, but time was short.
Assuming the crank needs to be ground anyways, it may not be a big deal to get the rod journals to BBC dimensions instead. Something to consider. S/F...Ken M
A closed chamber aluminum head would be my addition to your nice short block.I'm posting this as another option, and some data:
I built a 400 using the stock crank, albeit forged, and had the rod journals ground to 2.200 (BBC) used 6.800 rods with the Icon IC828 piston with a compression height of 1.485. The block was decked to 9.965, so the pistons were .010 proud. With a Cometic .045 gasket, that's about as tight as you can get for piston/head clearance. 452 iron heads, with a good value job and some blending, flow as 240I/200E at .500, surfaced until they were flat, and average of 3 chambers was 89cc. Calculated compression is 9.0:1, runs fine on 91 octane, under all condition so far. Cam was an Erson hydraulic roller, 231/237 at 050, 112 LSA, used with solid roller lifters and .008 lash, per Erson. There were some issues with the hydraulic roller lifters and I needed to put it together. Made 435HP and 440ft-lbs of torque with an out of the box Holley 750 vacuum secondary card and basic Performer intake, minimal tuning. Has 20 inches of vacuum. I'm sure there's a lot left to be found, but time was short.
Assuming the crank needs to be ground anyways, it may not be a big deal to get the rod journals to BBC dimensions instead. Something to consider. S/F...Ken M
Addendum: If you get 6.76 rods with a .990 pin, that leaves you .030 in the bore, going to a .030 gasket, and the math says 8.6:1 compression, which will run on 87 all day long.
not a bad ideaIf there are budgetary concerns.......I’d probably look for one of those low buck “400 stroker kits”, complete with a block.
Also known as a rebuildable 440.
Reuse block, crank, rods, & there are more choices for pistons.
Sell the 400 block to someone who wants to build a low deck 470 or 511.