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KB engine build #1581987 02/21/14 03:04 PM 02/21/14 03:04 PM
Joined: Feb 2004 Posts: 3,441 Mo. S supercomp OP master
supercomp OP master S Joined: Feb 2004 Posts: 3,441 Mo.	Getting ready to order a KB block and I,m wondering if I should build a 572 or 604. Reason being I only have some max ported by MCH B1 original heads with individual shaft jesel rockers. Will they support a 604 or would a 572 do just as well? And should the lifter bores be bushed? Any advice would be appreciated. Allen

Re: KB engine build [Re: supercomp] #1581988 02/21/14 03:31 PM 02/21/14 03:31 PM
Joined: Feb 2005 Posts: 20,174 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,174 PA.	If you EVER plan on building it bigger than a 572 you better at least get it clearances now. I didn't and am limited on my Keith Black engine. I don't ever plan on going bigger so I went the route I did. 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: KB engine build [Re: supercomp] #1581989 02/21/14 04:03 PM 02/21/14 04:03 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Getting ready to order a KB block and I,m wondering if I should build a 572 or 604. Reason being I only have some max ported by MCH B1 original heads with individual shaft jesel rockers. Will they support a 604 or would a 572 do just as well? And should the lifter bores be bushed? Any advice would be appreciated. Allen I would doubt they would work very well on a 604... if they were the M/C then they would... but they would still work to a lesser rpm .... thats a lot of flow you would need for the 604 and the revs EDIT I would think the originals would even be on the small side for a 572(even fully ported)..... JMO... I was going with the M/Cs on a smaller ci but was gonna have to rev it higher to make them efficient Last edited by MR_P_BODY; 02/21/14 04:22 PM.

Re: KB engine build [Re: MR_P_BODY] #1581990 02/21/14 05:22 PM 02/21/14 05:22 PM
Joined: Apr 2005 Posts: 2,128 Salt Lake City C camastomcat top fuel
camastomcat top fuel C Joined: Apr 2005 Posts: 2,128 Salt Lake City	I think the B1 572 or B1/MC 572, is the best option. Don't swing that much crankshaft until you have to. That said, if you ever think you might go bigger later, get the raised cam block. Also, be sure to get the drilled lifter bore/push rod oiling mod. For a straighter push rod angle, you might also consider the 2" spread lifter bore spacing too. JMO

Re: KB engine build [Re: camastomcat] #1581991 02/21/14 06:24 PM 02/21/14 06:24 PM
Joined: Apr 2007 Posts: 2,026 Trumbull,CT. J jim sciortino top fuel
jim sciortino top fuel J Joined: Apr 2007 Posts: 2,026 Trumbull,CT.	Useable rpm is your friend in a drag race..... No need to purposely decrease it in a limited cylinder head situation, unless the goal is a low rpm engine.

Re: KB engine build [Re: supercomp] #1581992 02/22/14 08:56 AM 02/22/14 08:56 AM
Joined: Jan 2003 Posts: 2,922 A shed in England Tig master
Tig master Joined: Jan 2003 Posts: 2,922 A shed in England	You will be ahead of the game with a raised cam block if you're going to go 604 with a wedge head. With a standard spaced cam tunnel, you can't get any decent lift without fouling the rods with a 4.75 arm. Lift can be addressed by rocker arm ratio but that creates there own little problems. Better off deciding now, belt drive is a lot more expensive than non raised cam tunnel. We've not ran bushed lifter bores and they're holding up fine. Our's is 580ci btw. Nice reliable, low maintenance 850 ish HP. 6700 shift. 7200 max rpm. see sig. HTH's '74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03

Re: KB engine build [Re: Tig] #1581993 02/22/14 11:25 AM 02/22/14 11:25 AM
Joined: Feb 2004 Posts: 3,441 Mo. S supercomp OP master
supercomp OP master S Joined: Feb 2004 Posts: 3,441 Mo.	This is is going in a S/C dragster. Thanks for everyone,s advice.

Re: KB engine build [Re: supercomp] #1581994 02/22/14 05:47 PM 02/22/14 05:47 PM
Joined: Feb 2008 Posts: 452 Monrovia, So-Cal, USA racerhog mopar
racerhog mopar Joined: Feb 2008 Posts: 452 Monrovia, So-Cal, USA	Check with Keith @ KB and see what he thinks of the 604's.... Bob(Cowboy)Hogan Monrovia So-Cal

Re: KB engine build [Re: racerhog] #1581995 02/22/14 07:25 PM 02/22/14 07:25 PM
Joined: May 2006 Posts: 253 Smithfield, Rhode Island Mulehead enthusiast
Mulehead enthusiast Joined: May 2006 Posts: 253 Smithfield, Rhode Island	Street Hemi KB 4:500 crank.Just something to look at 8049438-DSC06117.JPG (93 downloads) Ain't nuthin like a HEMI !

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