421 build up for a boss hoss

Old 02-15-2008, 07:30 PM
  #1  
cncmotorsports
Senior Member
MASTER BUILDER
Thread Starter
 
Join Date: Apr 2003
Location: Brookings South Dakota
Posts: 244
Default 421 build up for a boss hoss

ok guys, lets have it, we are building a customer a SB 421 stroker with AFR heads, goal is 600 +hp with 10.5:1 compression, will be using AFR 210 heads. And an air gap intake, as this is all the more room we have for height.

What roller cam ? I have mine picked out, but want to see how good the forum is!
Oh, we will dyno the engine so I will post the results.
cncmotorsports is offline  
Old 02-16-2008, 06:19 AM
  #2  
Pwmax
Senior Member
MASTER BUILDER
 
Join Date: Jul 2006
Posts: 184
Default

600hp should be easy. I recently did a 406 that made 646hp and 557 ft/lbs on pump gas, with Platinumn 230's. I am not talking cam specs though. lol

Frank
Advanced Performance
www.get-ap.com
Pwmax is offline  
Old 02-16-2008, 08:13 AM
  #3  
zipper06
Senior Member
RACING JUNKIE
 
Join Date: Jan 2006
Location: La.
Posts: 2,890
Default

I agree with Frank,
600hp is pretty easy. This cam, made over 600hp with brodix track 1's and an 850 holly with 406". although i did a little damage to the cam when i broke a rod bolt, i had bullit regrind it back to the same specs. it went 6.50's @ 3200lbs. with 12 to 1's.

JMO

Zip.

zipper06 is offline  
Old 02-16-2008, 10:56 AM
  #4  
jmarksdragster
Senior Member
RACING JUNKIE
 
jmarksdragster's Avatar
 
Join Date: Jul 2007
Location: Florida
Posts: 635
Default

Look for a cam with actual lift (minus lash plus rocker ratio to get actual) to put you .080 to .100 to coil bind (with good springs). 270 to 275 @.050 intake and around 8 to 12 more on exhaust. 106 LSA unless NOS will be involved, then go 112. A 421 should go 600+ HP easy enough.
jmarksdragster is offline  
Old 02-16-2008, 01:01 PM
  #5  
Pwmax
Senior Member
MASTER BUILDER
 
Join Date: Jul 2006
Posts: 184
Default

We have built a few engines for boss hoss's, and, they are insane. We have one guy, that we are building a 598 tall deck BBC for one. These are true street cruisers, and, solid roller cams aren't the best choice for them. Besides, The stock 355hp 350's or 502hp 502's will light the tires for as long as you want. One local guy has a 632 engine in one, that makes 830 ish on the motor, and 1100 on the bottle, lol. Thats plain rediculous, but, he is the local dealer for them, and, his bike has got to be outragous.

If you ever imagined riding a a V-8 engine, by itself, thats about as close to it as you can get. They are described as being the biggest speed thrill there possibly is. As totaly over kill as they are, they are still cool

Frank
Advanced Performance
www.get-ap.com
Pwmax is offline  
Old 02-16-2008, 01:25 PM
  #6  
v8Fiero
Senior Member
MASTER BUILDER
 
Join Date: Nov 2007
Location: Wisconsin cheesehead!!
Posts: 213
Default

we have a couple Boss Hosses around here that go to local car/bike shows, theres one that is a BBC, not sure of cubes but when he revvs in neutral he damn near tips it over because of the torque :shock:

I cant imagine having 600+hp in a 1500 or less lb STREET vehicle, thats insanely fast. :twisted:
v8Fiero is offline  
Old 02-19-2008, 05:34 AM
  #7  
Pwmax
Senior Member
MASTER BUILDER
 
Join Date: Jul 2006
Posts: 184
Default

Typicaly, the radical engines we do for them, use all aluminumn engines, to keep weight down. So, in reality, your talking around 1200 pounds, with the rider, tops. Most are around 1000lbs, with the all aluminumn engines. Like I said, I have personaly wrode one, and really don;t care to, but, the guys we know with them, describe it as the biggest speed rush there is.

Frank
Advanced Performance
www.get-ap.com
Pwmax is offline  
Old 02-25-2008, 02:16 AM
  #8  
us7race
Senior Member
EXPERT BUILDER
 
Join Date: Aug 2005
Location: Tell City, IN
Posts: 356
Default Re: 421 build up for a boss hoss

Originally Posted by cncmotorsports
ok guys, lets have it, we are building a customer a SB 421 stroker with AFR heads, goal is 600 +hp with 10.5:1 compression, will be using AFR 210 heads. And an air gap intake, as this is all the more room we have for height.

What roller cam ? I have mine picked out, but want to see how good the forum is!
Oh, we will dyno the engine so I will post the results.
How is the build-up going? Get it on the dyno yet? 8)
us7race is offline  
Old 02-26-2008, 04:57 PM
  #9  
cncmotorsports
Senior Member
MASTER BUILDER
Thread Starter
 
Join Date: Apr 2003
Location: Brookings South Dakota
Posts: 244
Default

We are 3 weeks out yet, we have about 10 engines to finish up first.
cncmotorsports is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -