Horsepower?

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Horsepower?

Post  Bigred69 on December 9th 2013, 9:01 am

Just trying to find out what horsepower I may be dealing with on my 429. It basically is a stock 72 429, with straight up timing set, stock cam ,pistons, exhaust, with Edlebrock performer, and new 750 Holley. It has C8 heads that have been ported , and new stock stainless Ford valves. It has a stock C6 tranny bolted up to it. I was just curious if anyone could tell me what kind of power this thing is gonna make. Not expecting a lot , it's going in a weekend cruiser.
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Re: Horsepower?

Post  supervel45 on December 9th 2013, 11:10 am

I have a 429 close to yours but with D2 heads and SCJ intake with a mild to medium cam, with headers. Glad somebody else plays with the little Big Blocks. If your block has not been decked with the C8 heads I would estimate 9.5 to 10/ compression. Factory was 10.5 or so on the shorter early deck, small chamber engines. The 1968-70 429's stock were rated at 360 net. Gross HP would have been around 290-300hp or so. With mild head porting, with stock exhaust, I doubt you will gain alot of HP and the Performer intake is not much over stock. The 750cfm carb may help some if the gearing, vehicle weight get along. I would guestimate 325Hp on a good day. Gas mileage should be better than alot of the radical monsters around here though.

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Re: Horsepower?

Post  Bigred69 on December 9th 2013, 1:13 pm

Humm, I guess I'm trying to figure out how the horsepower went down from net to gross hp. Did you mean to say 360 gross hp? I thought I would have been at least close in hp to the earlier motors that were rated at 360hp ,or even better with added porting and airflow.
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Re: Horsepower?

Post  supervel45 on December 9th 2013, 11:24 pm

I am sorry for that. I got them backwards. You should be around or above the 360 gross factory rating. I was using the 325 net HP as an example. The old rule of thumb was to subtract 60-70hp from the gross to equal the net.

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Re: Horsepower?

Post  Bigred69 on December 10th 2013, 9:55 am

Well, I know of figured that, but wanted to make sure. I think this motor will be plenty for what I'm doing.haha
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