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Horsepower Guesses SBC

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Old 07-23-2017, 04:42 AM
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Hopefully gen 1 stuff is allowed in this forum. I just finished up building a 355 small block and I'm hoping for someone far more knowledgeable than me to take a guess as to the horsepower. The basic specs are as follows
Cam: Comp XR288HR 236/242 duration at .050 520/540 lift
Heads: AFR 195 street eliminator
Intake: Holley 300-36 High rise dual plane (old school z/28 copy)
Carb: Holley 750 double pumper
Compression: 11:1
The rotating assembly is standard weight but fully forged. Any educated guesses are welcome and appreciated. Any specifications not specifically stated can be filled in at request. Thank you guys in advance!
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Old 07-24-2017, 10:33 AM
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Well you're certainly gonna be well above 400. I don't know anything about that intake manifold but if it's similar in performance to an Edelbrock RPM I think you'll be around 430 wheel. A good cam, head, intake car is going to be in the low 4's. Have any plans on dynoing it?
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Old 07-24-2017, 08:51 PM
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I intend to dyno it but I'm not sure when, I have a friend with a chassis dyno but he's a couple hours away and I just need to find time to go over there. The intake is very similar to the edelbrock, its a direct copy of the 1967-69 302 chevy manifold and is rated from 2000-7200 rpm on a 350 so it should move enough air. Also have a strip dominator single plane I might try out. Thanks for the input, its paired with a super t10 manual and a nine inch so my goal has been 425 to the wheels. Glad to hear that's not unreasonable.
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Old 06-25-2018, 02:22 PM
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I ran that exact setup with vortec heads and it made over 400 at the crank. Ran 11.90s on motor in a full body full interior 3rd gen. I swapped to a 195 trickflow head and a Vic jr and it was waaaaaay faster, the AFR heads are a lil better than the trick flows. I'd guess you are close to 450 with your setup.
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