081s or swirl ports
01-31-2010, 04:12 PM
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081s or swirl ports
im in the middle of building a 350 tbi to go into my firebird and my question is which heads should i use on it. I have a set of 081s and i have the stock swirl ports that came off the 350. I plan on having machine work such as porting done to whichever head i use but which one would have the better potential for this motor? my goal is 300whp and ill be using a lunati 60101 cam if that comes into play at all.
02-11-2010, 03:09 PM
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Car: 90 Formula -- tot resto in progress
Engine: 350
Transmission: 700R4 w/ 2500 stall, by Owen @ ARD
Axle/Gears: 3.23 posi disc
Re: 081s or swirl ports
Wow!! I can't believe this issue has skated for 11 days.
Usually any swirl-port head issue is like kicking over hornet nest.
Junior member w/ 7posts = Newbie?
Several things:
-- fill out the user data, you'd be surprised at how useful
it can be when answering questions.
-- spend some effort on grammar, & punctuation. The
old farts on this board that really know something,
are well... old school. If we can't understand you,
we're not likely interested in trying to help you.
-- WELCOME. Us old farts have a soft spot for anyone
trying to nurture & perpetuate the breed.
Enough
In their base form, the swirl-port heads are perhaps the General's
worst design idea. There are desciples on the board, who get impressive
results, but it's more of a quest to prove it can be done, regardless of
the cost/effort involved.
Do some searching, but I think you'll find the 081s are a much better
starting point for a 350 build. (Some swirl-port castings have smaller
combustion chambers, which can produce excessive comp-ratios on
other block/piston config's.)
Good luck.
Usually any swirl-port head issue is like kicking over hornet nest.
Junior member w/ 7posts = Newbie?
Several things:
-- fill out the user data, you'd be surprised at how useful
it can be when answering questions.
-- spend some effort on grammar, & punctuation. The
old farts on this board that really know something,
are well... old school. If we can't understand you,
we're not likely interested in trying to help you.
-- WELCOME. Us old farts have a soft spot for anyone
trying to nurture & perpetuate the breed.
Enough
In their base form, the swirl-port heads are perhaps the General's
worst design idea. There are desciples on the board, who get impressive
results, but it's more of a quest to prove it can be done, regardless of
the cost/effort involved.
Do some searching, but I think you'll find the 081s are a much better
starting point for a 350 build. (Some swirl-port castings have smaller
combustion chambers, which can produce excessive comp-ratios on
other block/piston config's.)
Good luck.
02-13-2010, 12:10 AM
#3
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Car: 1991 RS Camaro
Engine: 350 TBI
Transmission: 700R4
Axle/Gears: 3.42 Posi
Re: 081s or swirl ports
Your 081's are 58cc chambers most likely and meant for a 305. They will raise your compression quite a bit. Its going to be pretty tough to get to 300rwhp with the heads you have. I would consider selling them and finding a better flowing set like a Vortec and an intake to match.
02-14-2010, 06:17 PM
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Re: 081s or swirl ports
after doin some research ive found that i can get a set of vortecs pretty cheap so i will be getting those and just using the swirls to get me through inspection being the vortec tbi intake wont allow egr and i dont feel like having to butcher a new pair of headers so i can get the egr to work, thanks for the help though
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