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A while back I built a nice little 327 for my 64 coupe. Pro Max 185cc heads and hydraulic roller,roller rockers,Edelbrock manifold,750 brawler carb. It seemed pretty healthy unfortunately it spun a rod bearing. So I decided screw the little 327 if I'm rebuilding it's going to grow.I had a 1970 4 bolt main block out of my dads truck I had been saving for about 25 years. So I bought a Skip White performance 383 rotating assembly and used the rest of the stuff from the 327. Put it on the dyno. here are the numbers. Remember these are 800 dollar heads
You don't mention which cam you are using. With that said I would want a second opinion. There have been numerous articles written about misleading dyno figures and how it actually translate to horsepower at the rear wheels were it really matters.
You don't mention which cam you are using. With that said I would want a second opinion. There have been numerous articles written about misleading dyno figures and how it actually translate to horsepower at the rear wheels were it really matters.
It is relatable, there is a factor for determining rah from engine Dyno results
You don't mention which cam you are using. With that said I would want a second opinion. There have been numerous articles written about misleading dyno figures and how it actually translate to horsepower at the rear wheels were it really matters.
Skip calls it the magic cam look at skip white web site 383 he sells with bigger 200cc heads make 500+hp. You can only get the cam from Skip it's his grind made by comp
The roller cam you use is slightly smaller in lift and shorter in @ 0.050" duration than the Isky solid flat that I have in my 357, and my engine made 431 lbft @ 4400 and 446 hp @ 6300 (with 90% peak torque from 3600 to 5900, and 80% peak torque from 2300 to 6700 rpm). The result is a very similar 90% torque bandwidth upper rpm, and the greater extended lower rpm bandwidth from the greater stroke leverage. Fast ramp lobes can deliver a lot of cylinder filling at lower rpm ranges to generate a wide usable torque powerband (considerable torque with the larger stroke and displacement). You may need some sticky tires to tame all that low rpm torque for good ET's (or just have fun with it).
For inexpensive heads, the CNC program porting looks to be matched well to the lift of that cam.
Enjoy the result, and expect it to improve as you get the ignition advance tuning dialed in.
Skip did a first gen 427 sbc for my friend recently and it dynoed at 578 HP and 561 foot pounds TQ. We'll see how it holds up. The stuff I've seen from his shop has been very impressive. If I got one of his engines, it would be a 383.....they just seem to be the perfect fit for an old Corvette.
Why do they always start dyno pulls at 3000 RPM. It says nothing about what happens between 1500 and 3000 RPM which is where 85% of driving is done.
Doug
Depends on who's doing the pull. My friend's starts at 2000 rpm and goes up to 6200. The TQ curve was flat as a pancake. It's going to be a screamer in his '68 Camaro....
You've got a Dyno sheet dated 1980 … and a back story … is this an FYI post or are you seeking advice on something !
Don't know why my dyno guy dose not up date the year and month and day. Maybe he just isn't in to time. The story is so you guys out here can see you don't have to spend a bunch of your wife's money to make power. Just sharing. Good luck making that power in 1980.I can post inside the dyno room if necessary
02-06-2019, 10:18 AM
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