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Are these decent heads?

N

nsxxtreme

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I have an 87 blazer 350 recently rebuilt that has the stock heads

I have headers,flat top pistons, a mild cam and a chip from Brian at TBI chips. I would like to get more power and was thinking of replacing the stock heads with a nicer set of heads.

I was looking at vortec heads and found these with 2.02 intake valves. Dont know anything about the brand.

http://www.jegs.com/i/Patriot+Performance/723/2151/10002/-1
 
Before I write a bunch... are you changing your intake manifold as well? From what I remember, these Vortec heads use a specific manifold because their intake runners are moved up.

If you want to keep the stock TBI intake, you'll need to stick with a non-vortec set of heads.
 
westn11 said:
Before I write a bunch... are you changing your intake manifold as well? From what I remember, these Vortec heads use a specific manifold because their intake runners are moved up.

If you want to keep the stock TBI intake, you'll need to stick with a non-vortec set of heads.
Click to expand...

Yes I figured it was assumed that if you put vortec heads you would run a vortec intake manifold.
 
decent flow numbers. you might want to verify if the 64cc chambers will work with your pistons. compression ratio might be getting to high for pump gas.
 
old intake on Vortec heads

how do you port match the intake to fill the gap of the taller port? besides welding the intake to make it higher.

2011-04-24_12-45-44_135.jpg
 
How much rpm do you run now and how much do you realistically think is possible? A stock set of vortecs or some tbi heads with a little work may be good enough for a daily driver with essentially a stock computer system
 
kevin400ex said:
decent flow numbers. you might want to verify if the 64cc chambers will work with your pistons. compression ratio might be getting to high for pump gas.
Click to expand...

I'm running 64cc heads now with premium gas when I tow and 87 octane when I dont tow. It does just fine.
 
63chevyll said:
How much rpm do you run now and how much do you realistically think is possible? A stock set of vortecs or some tbi heads with a little work may be good enough for a daily driver with essentially a stock computer system
Click to expand...
It's not a daily driver. I use it primarily to tow my boat and to do some wheeling and camping in. I'd have Brian at TBI chips reburn me a chip.

Also found these head http://www.summitracing.com/parts/SUM-151124/ 194 valves.

For RPM I probaly max out in the 4500 range. I dont know much about GM parts but I think I remember reading somewhere for lower RPM I probably need lower cc intake runners and smaller valves because I'll never reach the RPM's where the other heads make power. Is that right?
 
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Those summit heads look good. Your right big valves and big ports would be a waste below 5000 rpm.

Is say the summit heads or stock vortecs. The vortecs seem to have the best air flow up to 5500-6000 for a stock head. But only good for .480-.500 lift

How did you get 64 cc currently?, were your tbi heads milled a bunch?
 
Patriot performance is a good company, I have a set of their aluminum heads and they are very nicely machined and good quality. I recomend their heads.
 
So I ended up finding a short block vortec 4 bolt main on craigslist last night for $300.

So I decided to just build a 383 this winter (what I should have done to begin with).
 
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