Well we had a stock cylinder head valve seat failure, no problems, only opportunities to make things better! So with our heads it made more power than the ported 317gm castings.
If anyone is interested in a similar set up just give us a call or shoot an email to martin@cprengines.com. We will be offering long block packages for all different power levels.
383cid has a great crank od ratio using longer 6.125" rods and 3.905" bore in an LM7 block. Full rotating 4340 Forged assemblies with pistons already lowered to correct the deck clearance make these engines virtually bulletproof and easy to get all the parts right. They are also very affordable. If you want to build an E-85 short block, you will have to find some custom pistons over 12:1 compression. The TF GenX 220 AS CAST heads are a good match (Brodix Dragon Slayer also a good option) for someone trying to keep costs down. For even less, use a stock reman shortblock. Some guy just went into the 6's with a stock bottom 5.3L (1700+fhp). Racing is expensive enough. Spend wisely if really want to call yourself a racer.
@@tonkatoytruck -7cc diamond pistons, 220cc cathedral port heads from Tony Mamo, fast 102 with 102 NW tbrottlebody. 4" eagle crank with Mahle 6.125" rods.
@@CPRENGINES i fell ye they all have their place and most are junk in many ways even wen new speaking of O.E stuff ..plastic timing gears is a good example of that
You can get a reman 5.3L for $1,500 without a core. Spend $2000 on the heads stated above, $1, 500+ on cam and upper valve train, and you have a 450fhp engine capable of handling just about anything you care to add to it. Add $1200 to go the forged 4340 assembly/383cid route, but, this does not include machine shop time for final assembly ($1500+......and no, you can't just bolt new parts together and pray all the tolerances are okay).
Yeah if that’s the case then there are a lot of “junkyard” purpose built race motors out there.I guess it needs to be a billet block to before its considered a race motor.
@@deegan727 a junkyard engine with thousands of dollars of parts in it? Shiny 'bling bling' engine covers and all kinds of aftermarket goodies? Show me one just like that for $500. Because $500 gets you a junkyard engine.
Compare the cost of buying a brand new aluminum block, getting it decked, align honed, and mocked up (pistons sticking out of the deck), and aftermarket head castings (with additional precision work), versus using a junkyard block with the same machine work, and ported GM heads.
tunercars3 you got us man! This is no junkyard 4.8... 383 with aftermarket heads. Does make some good power. As for running conditions we do like to run engines on the Dyno at 180-190deg water temp unlike others that run at 130... if you have doubts please feel free to test and compare on your Dyno. As for rear wheel numbers we have a 48” Dyno jet next door you can see some real world back to back. We usually see 18-22% loss depending on drivetrain
@@CPRENGINES not a junkyard engine with all those shiny parts. Far from it. Junkyard Motors don't have access to dynos or performance parts laying around. Also, everything was optimized to get those ghosts horsepower numbers. How about you sell me that junkyard motor for $500? Because you did say it was a junkyard motor, right? $500 for that motor, in that condition, running. I got $500 here waiting. Put your money where your mouth is or knock off the clickbait crap.
@@rockroll9513 never seen someone get so emotional over putting an engine on the dyno. Replacing parts in a junkyard engine, especially for a race car, is kinda necessary. Putting performance parts in it doesn't suddenly make it a non junkyard engine. The point is you can go to the wrecking yard and pick up a cast iron 5.3 for dirt cheap and get some decent power out of it. The alternative would be to order all new parts, including block, or ordering a performance engine for thousands of dollars.
@@63jeepj20 where did I get "emotional"? Did my comment trigger you? Amazing how a hypocrite like you gets so upset over a RU-vid comment that you feel the need to comment back because somehow my comment triggered your dumb a$$.
