345cc dart iron eagle head any good for boat?
 

6272990 are the casting number on the ones I got now 2.19" intake / 1.88 exhaust valves, 118cc combustion chambers, 318cc intake runner

The ones im looking at are Dart Iron Eagle Cylinder Heads as my 990s are cracked 15200132 casting number 2.30'' Int/1.88'' Exh Valves 345cc Intake Ports, 119cc Combustion Chambers

Would the dart heads work on my engine it's a mark iv big block bow tie block 502 bored 30 over 4.500 bore
l2513f 030 speed work forged piston with single valve relief I believe the crank and rods are stock
thanks for any help

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The direct answer is yes, it will work. But definitely not the best choice. At 345cc on the intake it's too big unless your adding compression and cam and plan on spinning it 6000rpm. IMHO, You'd be way better off going with a large oval port from Flotek, AFR, etc. The superior flow of this type head won't kill torque and will significantly boost torque and HP in the standard operating range.

I will be the contrarian to this conversation. I believe the addage of going "too big" with intake runner size and it will "kill" torque is overblown. You may not be utilizing the full potential of the head but I don't believe you will make less power than the ****ty stock heads. If you go to small on the runner size you will be leaving power on the table. Now I'm not saying the Iron Eagle is the best head out there, but they are pretty good and durable.

Ya I figured the the bigger intake port wouldn't be an advantage but there a reasonable price from a buddy that had them on his camaro and has upgraded to different heads just lookin to get my boat runnin my bigger concern is if the bigger intake valve and maybe different valve angles will cause the valves to hit my pistons?

The good news is that head doesnt flow so great so it`ll be just fine on a smaller engine. :D
You can`t be sure unless you throw some puddy in there and see how close everything is .

I had em on a 8.3:1 flat top piston, .680 lift

As long as the heads haven’t been decked and your cam isn’t installed 2-4 deg advanced you should be sufficient on clearance but as dan stated - clay it up To be certain.

Ya I'll will check piston to valve clearence when I get the heads just wondering if anyone would know if the .11 bigger would change piston to valve clearence much before I spend the money and buy them

And u consider a 502 a smaller engine? I guess there's bigger engines but still lol

I should have clarified, smaller engine for that application not that it`s a small engine.:drink:

ya gonna clay em if buy them just just wanna be 90 precent sure they will work before i buy em also fort to mention i got 1.7 rockers