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Old 03-18-2010, 09:15 PM
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Estimated horsepower for this 350 sbc?

How much horsepower do you think this engine has? Thanks in advance.

- 350ci (bored .30 over)
- 10.1 Compression (i.e, rated 9.5 compression flat top pistons with 1973 stock 76cc Iron Heads. However, 76cc heads milled to 70cc equating to approximately 10.1 compression.)
- Holley 600 cfm carb,
- Edelbrock EPS Performer intake
- camshaft duration @.05 is 224/224, adv duration 290/290, lobe on centers 107/117, cam lift .310/.310, and valve lift is .465/.465
- Mallory HEI distibutor
- 1 5/8" tube size on 3/4-length Patriot headers
- 2 inch dual exhaust.

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Old 03-18-2010, 09:35 PM
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Quote:
Originally Posted by Hanks56Chevy
How much horsepower do you think this engine has? Thanks in advance.

- 350ci (bored .30 over)
- 10.1 Compression (i.e, rated 9.5 compression flat top pistons with 1973 stock 76cc Iron Heads. However, 76cc heads milled to 70cc equating to approximately 10.1 compression.)
- Holley 600 cfm carb,
- Edelbrock EPS Performer intake
- camshaft duration @.05 is 224/224, adv duration 290/290, lobe on centers 107/117, cam lift .310/.310, and valve lift is .465/.465
- Mallory HEI distibutor
- 1 5/8" tube size on 3/4-length Patriot headers
- 2 inch dual exhaust.
RPM HP TQ
2000 130 340
2500 176 370
3000 219 383
3500 257 385
4000 286 376
4500 310 362
5000 323 340
5500 320 306
6000 282 247
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Old 03-18-2010, 10:25 PM
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What`s the part number of the piston used? how far down in the bore is the piston at top dead center? what head gasket was used?
With 70cc chambers, a .041 thick head gasket, normal .025 deck clearance the compression comes in at 9.1:1. Even if the block is zero decked it still doesn`t reach 10:1. If you went by the given compression ratio by the piston company they are usually no where near accurate.
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Old 03-19-2010, 04:53 PM
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Quote:
Originally Posted by techinspector1
RPM HP TQ
2000 130 340
2500 176 370
3000 219 383
3500 257 385
4000 286 376
4500 310 362
5000 323 340
5500 320 306
6000 282 247
Not sure how you calculated this but I really appreciate the feedback. Sounds like some new heads and a RPM intake manifold might get me closer to 350HP.
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Old 03-19-2010, 05:08 PM
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Quote:
Originally Posted by DoubleVision
What`s the part number of the piston used? how far down in the bore is the piston at top dead center? what head gasket was used?
With 70cc chambers, a .041 thick head gasket, normal .025 deck clearance the compression comes in at 9.1:1. Even if the block is zero decked it still doesn`t reach 10:1. If you went by the given compression ratio by the piston company they are usually no where near accurate.
Thanks for the feedback. As far as I know the engine rebuilder used a standard 350 rebuild kit with standard stroke, and used the compresiion ratio specified by the piston company (i.e., C/R 9.5.1 for 76cc heads). I'll contact the engine builder next Tuesday when he gets back in town and see if I can't obtain the other info you requested and repost. So are you saying if he used the piston company C/R rating of 9.5.1, normal head gasket and deck clearance I'm probably at 9.1.1 and that's with the 76cc heads milled to 70cc? How far off are these piston companies in specifing the compression ratio?
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