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Old 01-17-2018, 09:50 PM   #1
weq92f
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Join Date: Oct 2016
Location: Dallas Texas
Posts: 2,887
bbc retrofit roller update

Doing a cam swap on my BBC. Would like to get you all's opinion on the combination of parts...

BBC 1970 402 4-bolt block bored out .030 over ( .060 over 396 )
stock stroke
piston dome at 10 to 15cc
piston deck meets block deck at zero
#063 Cast Iron heads, stock valves, 102cc combustion chambers ( may mill a bit )
will be adding long tube headers, 2 3/4 inch tubes
dual plane Edel Performer II+ intake
1000 CFM MSD EFI TBI
will be adding a 1" carb spacer

700r/1800 stall/3.73 posi

compression is between 9:1 and 9.5:1

The cam we have chosen is the Comp xr276hr ( 224/239 Dur @.050, 110 LSA, 1900-5600 RPM: 410HP@5000, 467TQ@4000 ).

A close second was the comp xr270hr.

With this update, I'm looking for a gain in off the line performance ( may need more stall ) and mid range torque.

Fire away please. No parts have been purchased yet, well except for the rocker arms

-klb
__________________
67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi
07 335 sport turbo 6sp
94 Trans Am GT LT1 6sp posi -- sold after 22yrs
99 540 sport V8 6sp -- sold
73 240z L24 4sp -- given to friend
68 C10 step 350/350 3.73 open -- sold
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