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Best bang for buck SBC heads

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Best bang for buck SBC heads

Postby SKeown » Fri Feb 11, 2011 2:22 am

I'm trying to help my cousin decide on a good flowing head for his 350 SBC. He likes the idea of aluminum, but price is a factor, so I suspect iron may be considered.. His current heads are 74 cc and that's what he needs, that produces 10 1/4 compression and it's a street pump gas engine with a 230* @ .050 cam.

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Re: Best bang for buck SBC heads

Postby mike walsh » Fri Feb 11, 2011 7:34 am

Vortecs, can't beat them for price, ccs may need adjustment.
Dart Iron eagles in the paper here 1 season used, $500.00, buyer beware!
Craiglist, bunch of "ported" 882/3s for all kinds of prices.
What are the motors parameters? Like how many ponies, rpms, requirements?
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As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen
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Re: Best bang for buck SBC heads

Postby tony schmale » Fri Feb 11, 2011 7:48 am

Dart SS Vortec
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Re: Best bang for buck SBC heads

Postby RAMM » Fri Feb 11, 2011 7:54 am

I know the runners are quite large for a 350 BUT I would suggest the EngineQuest part #cc220ds. They are a straight plug, 220 cc runner, 72cc chamber and when I tested them they flowed about 255 cfm @ .600" IIRC. I think they are about $300-$350 each bare. J.Rob
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Re: Best bang for buck SBC heads

Postby 900HP » Fri Feb 11, 2011 9:07 am

Brodix IK200 best bang for the buck. $1100 +/- assembled. Call a Brodix dealer you might be able to get them for around a grand.

http://www.brodix.com/heads/ik.html
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Re: Best bang for buck SBC heads

Postby Tony B » Fri Feb 11, 2011 9:45 am

I would use the IK180's on a 350, for a street application. TB
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Re: Best bang for buck SBC heads

Postby pdq67 » Fri Feb 11, 2011 10:41 am

How is he getting 10.25 to 1 CR. using 74 cc heads??

A blue printed '67 350SS engine with 4-notch flat-tops, 64 cc double-humps and stock .020" thick steel shim headgaskets created 10.25 to 1 CR. back then.

What's he got, 12 to 1 pistons in it??

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Re: Best bang for buck SBC heads

Postby ItalianJohnny » Fri Feb 11, 2011 12:45 pm

What is His Budget ???? Best Bang for the Buck could be very different at $500.00 or $1200.00
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Re: Best bang for buck SBC heads

Postby 900HP » Fri Feb 11, 2011 2:09 pm

ItalianJohnny wrote:What is His Budget ???? Best Bang for the Buck could be very different at $500.00 or $1200.00


Good point. I assumed (there is that word again) that he was looking for entry level iron or aluminum heads with a 74cc chamber. Vortecs and iron darts have smaller chambers than this. The IK heads come with a 64 or 70 cc chamber but can be had with up to a 75cc chamber with the cnc chamber option which costs around $150 and if it's like the RR heads picks up the flow substantially as well. Just a touch over a grand for fully assembled heads that flow as well as the IK's is a very good deal in my book but if they aren't in the budget or if the budget is substantially more then there are a lot of other choices.

Pdq67 makes a good observation about the compression ratio though but without knowing the whole combo I can only go by "budget head" and "74cc" I personally would run the 200cc IK's even on a 350, they aren't that much head and they would work just fine with that duration/rpm range. IMHO.
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Re: Best bang for buck SBC heads

Postby SKeown » Fri Feb 11, 2011 2:41 pm

I went through the engine a while back, what I can tell you is after checking piston & head volume it ended up at 10 1/4 to 1 compression after decking the block and .015 shim gaskets. It has a Comp 230* hydraulic cam & springs, Weind single plain w/ 750 Holley and headers. I figure $1,200 max for complete heads ready to run for his cam. Naturaly he would like them to be aluminum. I have a mid 10 second AMX with ported oem irons myself.

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Re: Best bang for buck SBC heads

Postby chrisw1173 » Fri Feb 11, 2011 3:01 pm

Yeah are you so stuck on just 10.2 to 1 ? Run the brodix which is a great head for the money .Get it in the 70 cc chamber and go with it.... You will be just fine on pump gas I promise !! With the aluminum head you can get away with higher compression on pump gas. I have a 383 that is 11.5 to 1 pump gas motor and has no problems at that.
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Re: Best bang for buck SBC heads

Postby SKeown » Fri Feb 11, 2011 3:12 pm

The Brodix IK200 @ 70 cc's sound interesting. The engine is in a 56 Chevy that will be going to the strip and see 6000 rpm operation. I understand they are aluminum and will have suitable springs for his use?

Does everyone feel this is a logical choice, or what?

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Re: Best bang for buck SBC heads

Postby automotive breath » Fri Feb 11, 2011 3:36 pm

Tony B wrote:I would use the IK180's on a 350, for a street application. TB


DITTO; you don't need a bigger port for 350 with a low RPM camshaft
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Re: Best bang for buck SBC heads

Postby JoePorting » Fri Feb 11, 2011 3:57 pm

As pdq67 suggested, if you have a 74cc head on a 355 with flat top pistons, you'll end up with around 9:1 compression (.040" head to piston clearance). If you have 11:1 pistons in there, you should be around the 9.75:1 area. I'd recheck my compression figures unless you are running 12:1 pistons.
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Re: Best bang for buck SBC heads

Postby SKeown » Fri Feb 11, 2011 9:28 pm

JoePorting wrote:As pdq67 suggested, if you have a 74cc head on a 355 with flat top pistons, you'll end up with around 9:1 compression (.040" head to piston clearance). If you have 11:1 pistons in there, you should be around the 9.75:1 area. I'd recheck my compression figures unless you are running 12:1 pistons.


Okay, now I'm starting to question the heads chamber volumes, I'm going on George's recollection there, it's been about 18 months. I do know I calculated the compression at about 10.2:1 with flat tops & .040 P-H cearance.

I'll describe what I remember about the heads and maybe some of you Chevy guys can decipher what they are, I remember George said they were common truck heads, the same as on his Blazer. I recall the four center bolt holes were horrizontal rather than at an angle like the rest. The intake ports had a weird shape at the opening and the rockers were self alligning.

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