L 78 rebuild

[JRSully]

My 70 L78 was rebuilt dead stock (.30 over) with factory (and verified) 11;1 compression and NOS Factory L78 cam put in it, dead stock orig heads (hardened seats,factory size valves)dead stock original Holley 4557, dead stock orig distributor and headers, dyno'd (racing fuel) 422 HP at 5900 just about 400 lbs torque. Engine builder said headers probably added 20 hp + -. There you go SULLY

[P.J.]

Dead stock for my 70 L78 chevelle ,lots of power smoke the tires at will.
and its all to original specs.
Best vallue if you are ever going to sell.
PJ

[sztuty]

Sully
Thats exactly what I wanted to hear-a direct testimony
I am going to go with that GM Crane cam and use roller-rockers, stainless valves, etc.
I am running a 780 Holley (aftermarket) with the stock distributor with the electronic point replacement unit
If you are doing 400plus horse that makes me happy in my Nova
great info
Ty

[Chevy454]

sztuty: we dead an exact copy of a factory build on one of our L72s...crappy TRW pistons, didn't deck the block, heads left alone except for seats/guides/valves etc, GM/Crane blueprint cam, original 780 Holley...we cc'd everything and it came in at 10.2:1 compression, just like the factory. Anyway, we pulled just a shade over 425hp...we spent a whole day playing with it on the dyno. Thing ran on pump gas, and picked up some HP once it really got broke in...on the other hand, our 12:1 L72, with good pistons, the same GM/Crane cam, and a blueprint, will almost put that to the rear wheels!