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Old 09-15-2019, 10:19 AM   #1
badcompany89
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Default BBC head choice

I have a 13:1 496 that I planned to top with a set of Merlin 345 I have. Strictly a bracket car and I know the runners are a little large. Thinking about maybe getting a bare pair of blueprint or assault heads and swapping the valve train over. Other than weight savings would it make more power? The Merlin heads are pretty old so I'm thinking even a cheaper aluminum head would have a better and newer "design" what says the bullet?
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Old 09-15-2019, 08:26 PM   #2
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Default Re: BBC head choice

If it's just a bracket car, run em!
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Old 09-16-2019, 10:44 AM   #3
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Default Re: BBC head choice

Tell us more about your car.

How hard are you planning to turn the engine?
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Old 09-16-2019, 11:48 AM   #4
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Around 7200 "ish" I hope or think. It's a foxbody coupe with 28-29 tire. And a powerglide.
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Old 09-16-2019, 11:50 AM   #5
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Quote:
Originally Posted by Coloradoracer View Post
If it's just a bracket car, run em!
don't have a problem doing that, it'll save me a little cash.
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Old 09-16-2019, 12:04 PM   #6
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Default Re: BBC head choice

Run em....just don't over cam it for 7000 rpm
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Old 09-16-2019, 12:05 PM   #7
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Default Re: BBC head choice

I think your better with Flotek 315 or ProMaxx 317's. SAME CASTINGS save you some weight and work very very well for an offshore head. I personal am waiting on a set of Speier Flotek 290's for my streetcar. I would fully order and recommend Chad Speier. Get with him and follow this "formula":

"505 BBC. 315cc FloTec heads. Throats sized and SSR polished, 2.300/1.880 valves, 13.7-1, Ported Sniper JR, 268 cam, under .700 lift, 1050 QF carb [email protected] and [email protected]"

That is off his site under Flotek AS CAST heads. Can sell off the Merlins and do this in stages too if $$$ are not there now. But seem like a nice deal you could follow and get similar or even better results with a bigger cam??????

Good luck
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Old 09-16-2019, 01:36 PM   #8
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Default Re: BBC head choice

I would not voluntarily put cast iron heads on a BBC unless it was required by rules. Just too many nice choices in aluminum these days. And I would not pull parts off of used heads to refit in new heads. The 345 Merlin heads are still saleable to truck pull guys that have to run cast iron. Get your money out of them and then save for something you will like more in the long run. JMO.
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Old 09-16-2019, 01:54 PM   #9
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Default Re: BBC head choice

Quote:
Originally Posted by badcompany89 View Post
Around 7200 "ish" I hope or think. It's a foxbody coupe with 28-29 tire. And a powerglide.
What does the bottom end consist of? What rods and rod bolts? -- if you know what brand they are.

For heads, if you want to shift around that rpm, I'd look at selling off your current heads and look to a current alum head with an intake volume of 300 to 315 CC's. Be careful of the import heads --- if you go that direction, just deal with a known cyl head guy that uses them for his programs.

Make the torque work for you. The shift recovery will be much better with the smaller CC heads.
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Old 09-16-2019, 10:08 PM   #10
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Default Re: BBC head choice

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Originally Posted by Horndog View Post
What does the bottom end consist of? What rods and rod bolts? -- if you know what brand they are.

For heads, if you want to shift around that rpm, I'd look at selling off your current heads and look to a current alum head with an intake volume of 300 to 315 CC's. Be careful of the import heads --- if you go that direction, just deal with a known cyl head guy that uses them for his programs.

Make the torque work for you. The shift recovery will be much better with the smaller CC heads.
the pistons are gas ported diamonds, and eagle forged crank and rods. gen vi block with arp studs
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Old 09-16-2019, 10:16 PM   #11
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Default Re: BBC head choice

seems like im getting a few different suggestions but the consensus seems to be if going aluminum to go with a better brand head. think the plans going to be to run the merlins until i save up for something better.
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Old 09-17-2019, 01:52 AM   #12
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Default Re: BBC head choice

Run'em!
Those are some damn good heads, I had a set on my 13-1 compression 496, they made some serious power with a 722/722 lift Lunati solid roller cam, very consistent in my bracket turd, good luck!
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