[CompOrangeSN95]

I have a 302 that I got for free and I have big plans for it, but I'm a little cloudy on some things, I'm going with a probe industries PRO STREET 331 stroker kit, dart pro 1 comp heads 62cc combustion chamber 195cc intake runner, 1.6 roller rockers, I'll be running a dual plain intake and 750cfm carb but I have no idea what cam to put in it... it's being built for a road race application and will constantly be turning high rpm 4K-7K, any idea what cam I should be looking at? Does anyone know if I'll see any power gain by switching to 1.7 rocker arms instead of 1.6? Any problems with this set-up? I'm looking to make 400+rwhp N/A. I welcome any advice, thanks in advance guys.

[69fastback]

Just from the few things you said here, I would suggest doing some homework. I always thought Pro Street was a dragracing class??????

First off, why would you limit yourself on cubic inches with a 331? You can do a 347 for the same money.

Secondly, where do you plan on finding a dual plane intake that will support 7000 RPMs? If you're planning on making any power that high, you will have to use a single plane.



On a build like you're talking about, a custom cam is going to give you the best results out of all your parts. They don't cost all that much more than an OTS cam, and are worth it IMO.

[Smirnoff]

why 331 when you can go to a 347 for the same price with no ill effects, and why a dual plane when you plan on generally running high rpm just use a single plane

[69fastback]

Is there an ECHO in here?

[CompOrangeSN95]

the reason I'm sticking with a 331 instead of a 347 is because of where the wrist pin is located on a 347, because of the large stroke it is moved up so far in the piston that it interferes with the lower piston ring leading to increased oil usage and shorter life span, the 331 on the other hand doesn't interfere with the piston rings, as far as the intake, I will take your advise on that and look into the single plane manifolds, and yeah pro street is for drag racing but when it comes to a rotating assembly it's all about the materials, this kit is all forged and that's what I want in case I ever decide to get a power adder, I wont have to worry about my bottom end being able to handle the stress. Thanks for the advise on the cam as well, I think COMP cams will do custom grinds

[StangBanger302]

Originally Posted by 69fastback Just from the few things you said here, I would suggest doing some homework. I always thought Pro Street was a dragracing class?????? First off, why would you limit yourself on cubic inches with a 331? You can do a 347 for the same money. Secondly, where do you plan on finding a dual plane intake that will support 7000 RPMs? If you're planning on making any power that high, you will have to use a single plane. On a build like you're talking about, a custom cam is going to give you the best results out of all your parts. They don't cost all that much more than an OTS cam, and are worth it IMO.

Wait, couldn't you have gone with a 427 instead of a 408 for the same price too?

[69fastback]

When will this myth die? The info on the 347 is completely false. There are no such dangers with the 347.

[StangBanger302]

Originally Posted by CompOrangeSN95 the reason I'm sticking with a 331 instead of a 347 is because of where the wrist pin is located on a 347, because of the large stroke it is moved up so far in the piston that it interferes with the lower piston ring leading to increased oil usage and shorter life span, the 331 on the other hand doesn't interfere with the piston rings, as far as the intake, I will take your advise on that and look into the single plane manifolds, and yeah pro street is for drag racing but when it comes to a rotating assembly it's all about the materials, this kit is all forged and that's what I want in case I ever decide to get a power adder, I wont have to worry about my bottom end being able to handle the stress. Thanks for the advise on the cam as well, I think COMP cams will do custom grinds

Here we go....Talk to 1slo5.0 on here. He's had multiple 347's and he says they never gave him one lick of trouble.

[69fastback]

Originally Posted by StangBanger302 Wait, couldn't you have gone with a 427 instead of a 408 for the same price too?

Yes, if I wanted to buy new heads. I can make just as much power with the 408, as the 427 because my 185s are going to limit me if I go with a bigger CID.

[StangBanger302]

Originally Posted by 69fastback Yes, if I wanted to buy new heads. I can make just as much power with the 408, as the 427 because my 185s are going to limit me if I go with a bigger CID.

Gotchya

[CompOrangeSN95]

Originally Posted by 69fastback When will this myth die? The info on the 347 is completely false. There are no such dangers with the 347.

If it really is a myth, then I agree with you guys that a 347 would be a better choice, I'll have to do some digging.

[Smirnoff]

Originally Posted by 69fastback Is there an ECHO in here?

guess i should read the replies before i post haha

[CompOrangeSN95]

what kind of power difference would I see going to a 347 instead of a 331 based on what I said I'll be running, single plane instead of dual

[horsepowerjunkie]

Most Probe storker kits use the exact same piston weather its a 331 or 347. They just use a 5.4 rod in a 331 and a 5.315 in a 347. I've built several Coast/Probe 347's and none of them had the pin in the oil ring! And none of them have had any duribuility problems!

[CompOrangeSN95]

Originally Posted by horsepowerjunkie Most Probe storker kits use the exact same piston weather its a 331 or 347. They just use a 5.4 rod in a 331 and a 5.315 in a 347. I've built several Coast/Probe 347's and none of them had the pin in the oil ring! And none of them have had any duribuility problems!

Awesome, I did some searching on other forums and people say the same thing, looks like I'll be doing a 347 instead of a 331, anyone have an idea of what kind of power I can expect to make using those heads? Vic Jr single plane intake holley 750cfm 4 barrel

[69fastback]

I'm not too sure what those heads flow, but I would think you should be able to surpass that 400hp mark you mentioned, with a good custom cam.


Good choice of intake

[horsepowerjunkie]

I found some flow numbers on the Dart Pro 1 CNC. It looks like they flow 299 intake @ .650 and 220 @ .650.

[93hatch]

My 347 burns a quart a day if I drive it regular or 9 quarts a day if I drive it backwards

[CompOrangeSN95]

Originally Posted by 69fastback I'm not too sure what those heads flow, but I would think you should be able to surpass that 400hp mark you mentioned, with a good custom cam. Good choice of intake

Awesome, thanks for the help! A couple months and I will start ordering parts, I love when boxes show up at my house lol

93hatch, what your trying to say is I should bring oil with me every time I go racing? haha