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-   -   Aftermarket big block heads (https://www.offshoreonly.com/forums/do-yourself-boating-budget/280565-aftermarket-big-block-heads.html)

hotjava66 07-19-2012 08:56 PM

If you can wait a couple months I will have some low hour gm rectangle port heads for sale, switching to afr's:evilb:

Rookie 07-19-2012 09:15 PM

1 Attachment(s)
I liked my old 188's also. If I find my seat I can sell them to you. Yes they were just freshened up. At the least pay to have them Magnafluxed. Cracked between the the valves. I Have new heads now.

YellowFever 07-19-2012 09:33 PM

I went with a set of ARF 290 Ovals fully CNC Port Work. Super sweet heads, Spend the extra cash. Bob at MK gave me a great deal!!

YellowFever 07-19-2012 09:37 PM

4 Attachment(s)
290 ARF Heads

sparky24 07-20-2012 09:23 AM


Originally Posted by Jeff P31 (Post 3734626)
If you already have all the answers :rolleyes: why ask the questions

Do you think what I'm saying makes sense? I mean from a simply money standpoint not worrying about every last ounce of hp what I'm seeing is that aftermarket heads are going to cost me about 1000-1500 more than rebuilding Gm rect ports. I'm learning as I go here this is my first big block.

steveh1209 07-20-2012 11:24 AM

Heads play a big part in how much power you'll make. I decided on the AFR 305 with hard coat for salt water use. I purchased them bare and had tthem built. Short block was a 509. Nothing crazy. Those heads flowed awesome 610hp with all accessories ( - water pump) and eddie marine manifolds.

Worth every penny IMO

Cobra100+ 07-20-2012 01:24 PM

+10 on the AFR's. I have had or seen the seats fall out of countless GM heads even after fresh seats have been installed. If your bent on iron get some Dart's. I do have several sets of GM iron rec port heads, 2 pair with missing seats otherwisw very nice flow numbers and 1 set in perfect condition. All have big valves, inconel ex, and have been ported by Spyder Performance that are for sale cheap.

F-2 Speedy 07-20-2012 01:39 PM

Im also doing new power at the end of the season, 502's now torn between 509's or 540's with aluminum heads, great thread.

Its a shame you have to put all this high dollar stuff where no one can see it

Craney 07-21-2012 04:16 AM

How much $ are a set of AFRs??

YellowFever 07-21-2012 07:14 AM

3000-4000k depends on how you dress them, more moving parts in the heads. Why go cheap there, help the engine work easier. Good flowing heads make ez power.


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