RIO68

I'm rebuilding a L46 SB 1969 Engine...numbers matching car engine is stock bore with dome pistons...balanced the rotating assy...put harden seats in the heads that are original to the car and resurfaced just enough to true them up...all internal parts to be replaced...I want to replace original cam with one that is one step up as to performance... hyd lifts use a Melling cam but need suggestions as to lift...etc car is 4spd, AC, PB, PS, PW equipped not to compete just a solid street performance engine, putting 2 1/2 inch pipes chambered exhaust.

Thanks for any suggestions!

Revi

I have a 70 L-46, all matching numbers. The engine is .030 over, pocket ported the original iron heads, original pistons & rods, compression ratio is 10.4:1 so I can run 93 oct., I went with a Comp Cam XE262H-10. It engine dynoed at 341hp/387tq, chassis dynoed at 245hp/305tq, with original cast iron exhaust manifolds and 2 1/2" exhaust pipes, N-11 mufflers, M-21/3.70.

The limiting factor for this engine is the original cast iron intake manifold (it just doesn't breath well above 5000rpm) and the original 63cc heads (they don't flow all that well either). It pretty much limits the engine to around 350 hp (gross) or so no matter what cam you put in it. A set of headers would help the RWHP chassis dyno numbers a bit as well. It's still a fun street driver, but it won't run 12.00 1/4 miles.

If I had to do it all over again, I think I would have stuck with the original cam 3896962. For every day street use, I don't think you'll see much difference.

http://www.superchevy.com/how-to/eng...-dyno-testing/

augiedoggy

My vote would be the lunati voodoo 262/268 split cam designed by UD Harold... it did better than both the comp xe262 and 268 in my dyno software and still works well with stock 2000rpm converter (doesnt matter in this case) and vacuum is good. it has great street manners.

cardo0

W/o knowing your comp ratio, gearing for trans and rear both, and type of exh sys an accurate choice will be difficult.