combo question

grumpyvette

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Staff member
stoglin710 said:
400 SBC .40 over flat tops with scat balanced rotating assembly lunati 50140 .640 in-.645 ex roller rockers brodix track 1 heads holley 750 msd etc. Will a super victory intake work well with this setup.and what kind of horsepower and torque should it make thanks


heres what info I can find easily
http://www.lunatipower.com/Product.aspx?id=1803
Solid Race Roller. Excellent bracket race cam in Super Gas/Super Comp classes with 350-406 c.i. motors. Needs 4500-5000 RPM stall converter, headers, 12:1 compression ratio and 4.88+ gearing. Rough idle.

Advertised Duration (Int/Exh): 308/316
Duration @ .050 (Int/Exh): 276/284
Gross Valve Lift (Int/Exh): .640/.645
LSA/ICL: 106/102
Valve Lash (Int/Exh): .025/.027
RPM Range: 4400-7800
Includes: Cam Only

Part Number: 40120940
Previous Part Number: 50140

http://www.jegs.com/p/Brodix/Brodix-Tra ... 6/10002/-1

track1a.png



yes the edelbrock vic series should be a good match
http://www.jegs.com/i/Edelbrock/350/282 ... ProductId=
EDL-2825a.jpg

edmv1.png

edmv2za.png

theres too much missing info, on components used for a soft ware dyno to give a good guess, but looking at what I do see posted I think your compressions a touch too low, for the ideal combo, youll still need 114 octane anyway because your at near 11.4:1 compression but the combo will run better near 12.5:1 compression,and a 750cfm carbs a bit small

http://www.projectpontiac.com/ppsite15/ ... calculator
SAFE piston speeds are best restricted to 4000fpm for stock components and 4500fpm for the better common aftermarket components
if your serious about building a performance engine you might want to consider a BBC over a SBC
you can generally expect to get between 1.0 to 1.3 ft lbs per cubic inch of displacement and 1.0 to 1.3 horsepower per cubic inch of displacement on your average street/strip daily driver SBC or BBC engine build
how the big block and small block engines differ. The answer is not only in displacement. A small block Chevy motor can be stroked and bored to over 400 ci . it comes down to bore centers. and much stronger OEM blocks and generally better flowing heads, The small block has bore centers spaced 4.4 inches apart. On the big block, those centers are at 4.84 inches.
as a general rule you can build a 396-402 BBC that can outperform a 400 SBC, you'll have a difficult time finding SBC heads that flow more than 310 cfm at a decent price, but many BBC heads flow in excess of 350 cfm, especially if mildly ported and aftermarket BBC heads that flow over 400 cfm are available

keep in mind your basic BBC With more metal separating the bores, there's extra space for cooling galleries and added potential for boring-out. Further, more metal means a stronger block. cranks and rods and the basic BBC block are significantly stronger than the average OEM sbc parts, If you're looking for big horsepower from your muscle car motor, a big block might be the way to go.
read these threads
 
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