302 hp with cam?

[tootoot]

Just rebuilt my 302 with 351 heads and elgin cam 959p int 448/270 ex 472/280 dur@50 204 int 214 ex. Has original holly 4160 4brl. Everything else stock. Approx what will my hp now with the cam be?

 

[tootoot]

Re: 302 hp with cam?

P.S. Stock was 225 hp.

 

[kfraser]

Re: 302 hp with cam?

Hey Toot,<br /><br />Not sure on the HP. I have the same setup, but with a 2bbl holley, 188hp. Is your intake for a 302 or a 351? Mines a 302, but I want to upgrade to a 4bbl and wasn't sure about the intake. Thanks!

 

[Boomyal]

Re: 302 hp with cam?

Kfraser, you need a 302 4bbl intake. 351's are too wide. You can either go with a stock iron or an Edelbrock performer intake.

 

[kfraser]

Re: 302 hp with cam?

Thanks Boomy, any ideas on toot's hp?

 

[tootoot]

Re: 302 hp with cam?

kfraser, thx. Boomyal has it right. If I had to do it over id check into better flowing heads and a edelbrock. I heard later model 302 heads actually will flow better. Dont think there is any flow diff between early model 302/351 heads. My prob is 188 outdrive. here and the factory said 250 hp is pushing it. figuring 10 hp for every mph after 60 to go as fast as I want, Id need approx 1,250 hp. Ha HA. Got a spare helicopter turbine? Tx for the help.

 

[tootoot]

Re: 302 hp with cam?

kfraser. I forgot. a little short story. Had my girlfriend on the boat the second time i took it out and was propping it. I had the boat planning with the motor cover off and at around 2800 rpm 30 kts. Told her to hold on and dropped the throttle all the way. That wonderous BBOWWWW from the back and that boat layed down and started screamin along 50Mph. She grabed me and with eyes popped out say Slow this &^%#$@@* boat down. Next time I left her home so I could do what a mans got to do. Anyways the point was I think youd enjoy the 4 brl. BBWWWWWWW

 

[Haut Medoc]

Re: 302 hp with cam?

Replace the 888 with a newer Alpha....And you will be able to approach 300 H.P......I love all this Ford talk, because when I replace my 302, I'm gonna try to do something "Special". I have a '73'22 SRV Sea Ray, & I think an extra 100 H.P.would make it "peppy".. ....JK

 

[Boomyal]

Re: 302 hp with cam?

Originally posted by J.kopec:<br /> ..I love all this Ford talk, because when I replace my 302, I'm gonna try to do something "Special".

Hmmmmmmmm, JK, maybe a 302/331? or a 351/383 perhaps?<br />Whatever you do, just be mindful of keeping your torque curve on the low side.

 

[Haut Medoc]

Re: 302 hp with cam?

Boom, when it comes time I will probably have the 302 bored out....I have a (almost new) Alpha 1, so.... I can safely assume that it will be able to handle 270-280 H.P. without me gettin' jittery about being heavy handed when need be.... I will say this about the Ford 302....It has been a strong, reliable engine for its' age...I know I can still get a couple more seasons out of it....Just lookin' for a house now so I can do it as a winter project & do my deck & gas tank at the same time..... Allare original equipment!.....JK

 

[Boomyal]

Re: 302 hp with cam?

Jk, yur gonna have trouble gettin that kinda HP out of 302 w/o stroking it. You'd have to use to high a lift cam and to high of compression to get that much poop. You'd also move the torque/rpm curve way above where it need to be for marine use.<br /> <br />On the other hand a 331 stoker uses a 302 block, bored .030 over with a 1/4" longer stroke and 5.4: rod. With a proper aggressive marine cam you can pull 300 hp w/o breathing hard. Tons more torque as well at the lower rpm band.

 

[kfraser]

Re: 302 hp with cam?

Thanks Toot & Jkopec. Man, that is exactly what I want to happen when I take my girlfriend out on the boat. And if she complains that I'm going too fast I'll just leave her at home with the wife...Oh Yea!!<br /><br />I've got my engine out and should have it back in the boat in a couple of weeks. I've been shopping around and found a couple of intakes I like, but I'm not too familiar as what to look for. I'll start another post. I'd love to hear your comments or suggestions..

 

[Haut Medoc]

Re: 302 hp with cam?

Boom, & KF...I don't want to get too radical, I would love to get about 260 though.....Since I have a Ford configuration (302) I'm gonna stick with that...I do have the room for a 351 & I know what that entails...But until that comes along for a good deal...I'll stick with what I have...I still have my dreams...I gotta wait for some of the Bayliner/O.M.C.'s to give up the ghost.. ..JK

 

[Boomyal]

Re: 302 hp with cam?

JK, a 331 is not radical. It's just a longer stroke 302. Longer stroke ='s higher torque, right where you need it. That's exactly what you want in a boat motor.<br /> <br />What you don't want to do is build a high compression, high reving 302. For a 302 to develop above 230 hp, you have to move the torque band up into the higher rpm ranges where you cannot use it. Then the boat performs miserably at the speeds you want your power. <br /><br />The other nice thing about a stroked 302 is that you retain the weight and dimensions of the 302 compared to the extra height, width and weight of a 351. Just some thoughts.

 

[Haut Medoc]

Re: 302 hp with cam?

Greatly appreciated, Boom.....When I get ready, I will pick your brain Big Time....I don't need a radical change... Just want to move the old girl a little faster....She has it in her...I don't think that they build boats like her anymore....And she is way under powered for her size + weight....JK

 

[Boomyal]

Re: 302 hp with cam?

Actually JK, I just reread you post and see that you have a 22' (gulp) Searay. It would handle a 351 with no trouble and it would be a lot cheaper than a stroked 302. A nice 4 bbl and intake, at 9:1 compression and high end marine type cam and that thing would just get up a scoot.<br /><br />Keep your eye out. 351's are cheap and a lot of your marine 302 stuff will fit. If your doghouse can handle an extra 2" wide and 2" tall, she'd drop right in.

 

[Boomyal]

Re: 302 hp with cam?

Sorry about the hi jack tootoot. I don't digest cam specs very well but if it is proper for the marine power band it probably wouldn't be over 230 hp. I would venture to say that if the rpm range for your cam is signifigantly higher than 1K to 5K your HP might be higher but it would not occur in the area that you need it. In fact the wrong cam can actually hurt performance in a boat.<br /><br />Also if you have your original pistons (marine motor) your compression ratio is a bit on the low side to make it much snappier. (about 8:1)

 

[murphini]

Re: 302 hp with cam?

Hijack, part II:<br /><br />Semi-off-topic question: I read post/questions about taking auto engines and marinizing them. Cams. Pistons. Stoking. I get that concept. Marine engines need more grunt/staying power because of the loads they pull..<br /><br />Question: Why don't auto hot-rodders take Marine engines and put them in their cars/trucks? <br /><br />Don't want to start a huge answer--just curious.

 

[Haut Medoc]

Re: 302 hp with cam?

I would think that you need more top end than torque.....Boats have two gears, foreward and reverse.....Cars can have six or seven.....You just don't need as much torque when you have the gear options, just a higher powerband & R.P.M. potential.....JK

 

[rbezdon]

Re: 302 hp with cam?

combine what JK said above and add the cost. Why pay for the staying power as you call it, basically the ability to run at full HP output for extended time when you dont need it. It is impossible to have a car engine run in that condition even is drag racing. 10 to 15 seconds and your up to the speed you can get to, holding that speed takes very little HP. Towing or hauling being the exception and those truck type engines have many of the marine upgrades except things like brass freeze plugs and things that are environment related.