427 BBC Big Block Chevy Comp Cams XR276HR Roller Camshaft DYNO TEST 👀 How much HP will it make?? 

Nice compliment, thanks Thomas. AG

Thanks Richard, always good to hear from you.

Thanks for the nice compliment @terry. More to come. AG

Thanks Shad, that will be a nice engine. I think you will make a little more power and torque than you are expecting, let us know when you dyno it! AG

Thanks Bill, Not much difference, 31cu. in. to be exact. That is a lot of RPM for a BB? Enjoy your ride! AG

Thanks for your comments. Same heads, you have a little more cam. Either way, fun to drive.

Thanks Hank, I will be installing it in a 1966 El Camino in a couple of weeks, watch for the video about it. Thanks for your comment and watching Gold's Garage. AG

Thanks Patrick, please keep watching and commenting. Lots of content to come. AG

Good question Anthony. It doesn't hurt to start it up without a load. I have an engine start up stand and do that to break in the cam before we go to the dyno. That said, you do need a load on the engine to break in the rings. You can only do that on a dyno or in the car. When the engine is loaded the compression pressure gets behind the rings and pushes them against the cylinder bores. Hope this helps. AG

Thanks for your input VanHalen. Actually, the engine was fully warmed up before we started the video. I think Darrell starts every pull at the same water temp so that results will be consistent.

Thanks for the comment Tim. AG

Thanks for the question Gig. This engine was 10:1 CR, cranking pressure was 176 PS1. I think we used 93 octane but it should run on 91 as well. Pump gas for sure. AG

@@goldsgarage8236Thank you!

Thanks for watching and commenting Rick.AG

Thanks for your comments Anarchy. SAE (Society of Automotive Engineers) corrected HP is a standard in the industry. It is essential to enable accurate comparison of Dyno tests anywhere in the world. Without it we would all have to move to sea level and wait for standard weather conditions.

Thanks Peggy. Yes an electric water pump would reduce the parasitic losses and result in a higher HP and Torque reading on the dyno, however when the engine is installed in a car it will have a mechanical WP, so using it on the dyno produces more realistic results. I hope this answers your question. Please keep watching and commenting. AG

Thanks Seb, not sure what your question is? AG

Thanks GJ. actually I did change it for a dual plane intake before I installed it in and El Camino. there are some videos about that on my channel. AG

That is a good question Rick. i just made 503HP on my last 406, still very streetable. There is a recent video about it. Not hard to make 550HP with a 427 SB. The three main ways to make power are compression, camshaft and air flow. Getting combustible mixture past the intake valve is the biggest challenge. If you want to make big power I think the cylinder head configuration of the big block with the canted valves, (once called the semi-hemi, or porcupine) and larger valves is superior to a small block that has the intake and exhaust valves in line. The big block has a larger center distance between bores, so this allows larger valves and reduces shrouding by the cylinder walls. The 427 SB is limited by the same bore spacing as the original 265 in 1955 which had 3.75" bore. Another thing to think of is a 427SB is expensive to build. Small base circle camshafts and all rotating assembly, (maybe even the block) is special aftermarket expensive parts. I had a 427SB in my SLM circle track car where weight and rotating inertia is critical to cornering. If weight is not important, and you want big power without stressing it too much i think the big block is your choice. The 427 in this video had a pretty mild cam, it made 479HP and 499ft./lb. torque. I choose that to duplicate the GM ZZ427 Crate Engine. Lastly, how much power do you really need? I think 500HP on the street is enough and you can get that easily with a 400SB. Hope this helps. AG