Straight to the track! 383 or 408?

[moggey01]

shorter deck blocks will help some in acceleration. I like the old school stuff as in original style blocks or ''mid deck'' blocks. If you can locate used splayed valve or or SB-2 heads this will be the meanest stuff you can get. If you add nitrous ,turbos or whatever this will be the most powerfull. These heads make power real high in the rpm range so your limited as far as street driving and you trailer to the track. I helped a guy with a 427 mid deck splayed valve set up for 2 kits. It made over 1000 hp without nitrous. This was 10 years ago so you should be able to find some of that stuff pretty cheap now. I have seen 375 inch comp motors make 1,100 with the same type of set up. I have always liked good used comp eliminator parts because you know it will make power.

[68GMCCustom]

or.........if you are stuck on a sbc stye short block but like the flow numbers of LSx heads:

MOTOWN LS Iron Block

The unique Motown LS block lets you utilize a full compliment of standard small block Chevy components with the decided advantage of being able to employ high flowing LS-type cylinder heads. In addition to the internal components, the Motown LS allows use of expensive already-purchased items like pulley kits and external accessories. The block also boasts a coolant capacity in excess of 150 fluid ounces to provide superior cooling. Motown LS blocks are offered both bare and fully race-prepped for your convenience.

THE MOTOWN LS IS A UNIQUE ONE-OF-A-KIND BLOCK MADE ONLY BY WORLD PRODUCTS!

Note: The Motown block employs a standard SBC water flow path. When using LS-style heads on the Motown you must use an adapter on the heads to facilitate a return flow to the radiator. The World Products Cooling Adapter (p/n 061079) also accommodates standard SBC accessory brackets.

motown-ls-iron-block.html

TECHNICAL SPECS

Casting ID Number: WOR-042A
Material: High density cast iron
Cam Bearings: Standard SB Chevy
Cam Location: Standard SB Chevy
Maximum Bore: 4.200”
Cylinder Wall Thickness: .250” at 4.200” bore
Deck Height: 9.249"
Water Jackets: Expanded for better cooling
Lubrication: Priority main oiling system
Oil System Features: Integral boss for
front feed, boss for rear scavenge, rear main cap can accept wet sump pump
Filter: Integral mount for spin-on filter
Oil Pan Rails: Solid (stock width) clearanced for 4.000" stroke
Main Cap Material: Street and Sportsman blocks caps are made from nodular iron, Race blocks are made from 1045 billet steel (unlike competitors’ softer 1020)
Main Caps: Street block caps 1 thru 5 have 4 bolts, Sportsman and Race blocks have splayed 4-bolt caps (2, 3,4) and straight 4-bolt caps (1, 5)
Main Cap Hardware: 1/2" ARP and ring dowels used to locate main caps firmly into position (not antiquated standard OEM outside registers)
Rear Main Seal: Two piece SB Chevy
Fuel Pump: Stock location SB Chevy
Motor Mounts: Dual (frnt & side) SBC/ LS
Cylinder Head Bolt Holes: Blind tapped to prevent water leaks
Lifters Bosses: Clearanced for vertical bar lifters (can use std. height LS lifters)
Clutch Linkage: Standard mounts
Starter Mount: Stock location
Weight: Approximately 190lbs.

REQUIRES USE OF BLOCK KIT #703848-K

hows that for covering the bases

[hotrod 80]

Originally Posted by 68GMCCustom

or.........if you are stuck on a sbc stye short block but like the flow numbers of LSx heads:



motown-ls-iron-block.html









hows that for covering the bases

My machist wants to do one of these and an LS doesnt fit in a Luv very well.

[68GMCCustom]

Warhawk LS - aluminum LSx block



Motown LS (sbc short block)

[GMR-PERFORMANCE]

68 I did read about that but have never seen one done.. , gotta say cool.

[68GMCCustom]

world products built one on one of the rags ....can't remember which tho. A LSX with the same heads and cam, etc......the Motown LS made just a tad more power. Can't remember why tho. damn meds!

[GMR-PERFORMANCE]

I spoke to a guy at the show with a 454 SBC he is going on about how much power it made.. 679 at the flywheel, I ask about the engine he has almost no idea what is in it really, and then tells me " well these headers and intake and carb are not what was used to dyno the engine" He liked the looke of this carb better, and this intake is a nicer looking item and the headers blah blah " I just smiled and walked on... Funny I got 679 HP but I changed the parts but hey it made 679 HA HA ... Too bad marv was not there... lol ... he would have loved that guy .

[68GMCCustom]

more money then since

[C20-67_N_MO]

World Products has some very nice go fast goodies.

[GMR-PERFORMANCE]

There seems to be a large sway either way for or against world stuff. I do not know what that is about. But it does seem they are trying new things and working on bringing items to the table that others do not..

Another shop built a ols style SBC with LS intake and hemi heads. I ran across that in the good guys magazine..

One thing I do know is that the hybrid stuff is very spendy.. to the point where one would have to think about the build vs just building a real ls engine.

[68GMCCustom]

I think the main reason for it is for guys that either have to run a sbc shortblock or because they have to run a carb and a dizzy...because of their racing class rules?

...and yes....there's a GMPP water pump setup you can run that provides for a front mount dizzy for the LS...like a f*rd.

[GMR-PERFORMANCE]

Running in a "class" would change things, I was more thing ET class pro.. so anything you want just dont run under a 9.99 unless you have the full cage etc. Up to that point not hard to run very fast for a street vehicle. I am setting my truck up for that and the rules are pretty basic. I have to added a few things but nothing major, unless I run under the 9.99 then its gets more complicated. But hey you also get the one freebie after that its shame on you..

[68GMCCustom]

I don't plan on mine ever getting that fast....12's is the mark so its possible I'd wind up in the high 11's but certainly no faster. Trying to keep all motor...if not just a small shot.
This truck already has a future owner...my grandson!