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Old 08-06-2017, 01:24 PM   #1
Sawlog
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How much hp gain?

I recently replaced the iron heads on my truck and changed the cam. 350ci
My old heads were 72cc with 1.94intake and 1.60 exhaust. Cam was stock.
My new remanufactured heads have 64cc chambers with new 2.02 and 1.80 valves. The intake and exhaust ports were opened up too. My dad called it gasket matched?
New cam is summit 1102, 204-214 at .50. 421-444 lift.
My question is... is there any way to guess how much of a horse power gain it made?
Thank you
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Old 08-07-2017, 06:58 PM   #2
tdangle
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Re: How much hp gain?

how does it feel? more power off idle or in the upper RPM ranges?
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Old 08-07-2017, 07:03 PM   #3
Sawlog
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Re: How much hp gain?

Quote:
Originally Posted by tdangle View Post
how does it feel? more power off idle or in the upper RPM ranges?
I would say lower range
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Old 08-07-2017, 07:19 PM   #4
mongocanfly
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Re: How much hp gain?

other than a wild guesstimate ..only way to know for sure would be stick it on a dyno
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Old 08-07-2017, 08:57 PM   #5
71cheyennesuperlongb
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Re: How much hp gain?

Go on comp cams site.Look for cam quest.You can build your motor and it will tell you what hp you are at.
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Old 08-07-2017, 09:18 PM   #6
hjewell2
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Re: How much hp gain?

Quote:
Originally Posted by Sawlog View Post
I recently replaced the iron heads on my truck and changed the cam. 350ci
My old heads were 72cc with 1.94intake and 1.60 exhaust. Cam was stock.
My new remanufactured heads have 64cc chambers with new 2.02 and 1.80 valves. The intake and exhaust ports were opened up too. My dad called it gasket matched?
New cam is summit 1102, 204-214 at .50. 421-444 lift.
My question is... is there any way to guess how much of a horse power gain it made?
Thank you
went from 165 to 250 maybe 275 hp
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Old 08-08-2017, 06:40 AM   #7
cadillac_al
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Re: How much hp gain?

That Performer cam is bigger than the factory 350 hp cams but I really don't believe it would make 300 hp. I'm with hjewell2 that it is more likely 250-275.
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Old 08-16-2017, 08:58 AM   #8
tjsblazer
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Re: How much hp gain?

Camquest is typically generous in their ratings. After all they are trying to sell performance upgrade parts. Anything outside of a calibrated dyno run is just a guess which is essentially what you asked for, I guess ...
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Old Yesterday, 06:37 PM   #9
mattfranklin
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Re: How much hp gain?

Years ago I had a program called "Desktop Dyno" that had lots of options. It worked pretty well, of course the % change guesses were more useful than the absolute numbers. Not sure if it's still around.
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