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Old 10-14-2012, 01:20 PM
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Read my post #11 again and research the flat tappet alternatives.
Once of the best choices for a high quality flat tappet cam for your BBC.
ISKY Racing Cams - Do It Right. Race with the Legend. Camshafts, Connecting Rods, Valve Springs, Lifters

I have never seen a Isky flat tappet cam fail or wear out. solid or Hyd BBC or SBC ---Ever.
Their solid flat tappet BBC street cams rock.
Call 'em for cam choice help. Do no just shop the Isky catalog. call them.
something like their intake lobe # S-550 combined with exhaust lobe S-385 on a 110LSA, in on a 104 to 106 In C/L will rock.

278-288 244--254@.050 .595-.595" lift .016 .018 lash.
Now you're cooking with gas!


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Old 10-14-2012, 01:36 PM
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781s /peanut heads/vic junior aluminum,???w/e head you use,doesnt matter,flow test them to see what power you can make,,,,other wise you are guessing.The number 500 is just a number for bench racing.lots of lower h p cars,,,IE honda,, or other little 4 bangers go faster than BB chevys for a reason.

RPM/gear matching,,weight/hookup,,,are the things you need to consider.
again,my 80 Camaro ran 11.9 with stock LS-5 specs,using z-55 cam,830 holley,vic oval port,hooker street headers,turbo 400, 219/188s. If you want to go faster,improve on that package,better heads would make the biggest difference.
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Old 10-14-2012, 02:24 PM
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The 781 heads are 700hp capable in full ported form with big valves. Suerstock super gas combo. (big racey roller 14:1cr)

They need some porting and the big valves for your motor. The valve job is critical for power on these heads. They make amazing power and torque on street motors just like this, using one of the many cams I suggested. ALl these will work very very well.

Follow my recomendations easy 550+hp and a ton of torque. with the solid flat tappets, more with the mech street rollers.
Big reliable power on nitrous that does not crap out before the end of the track
The hyd will.

I just went thru this with a friend here on his pro street 396 chevelle with nitrous.
He loves his new XR286R-10 mech street roller cam and K kit. . And has seen the light. The motor really hauls the freight now.

BBC's work way better with a mechanical cam. ALl the fast OEM hi perf muscle car BB's Chev Ford chrysler ran solid lifter cams. for a very good reason.
Hyd rollers are fine for 5500 rpm or less.
How far down the track do you want to get.?

Last edited by F-BIRD'88; 10-14-2012 at 02:38 PM.
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Old 10-14-2012, 06:43 PM
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Information I found is,The oval port heads flow 270 cfm in the intake side and 190 cfm on the exhaust side,Thats 70% on the exhaust side so a split pattern camshaft would be needed.If you really know your engines you could make 590 horse power or probably a lot less with all the right parts.Thats using a .600 lift cam.
the peanut ports flow 225/160 for the 156 heads and 235/150-165 for the 236 peanut heads,so 450 horse power maybe,,,not worth using in a performance car.
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Old 10-16-2012, 06:32 AM
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With your compression a custom comp cam on a steel core with extreme marine lobes 3733 for exhaust 3475 for intake ground 112 +4 Use lunati 75820 beehive springs set them .060 from coil bind it won't float till 6500
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