head opinion needed
Thread Starter
Pro
Joined: Jan 2003
Posts: 669
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From: memphis tn
head opinion needed
do you guys think a 200cc intake port would be too big for a mild 355? im kinda worried about port velocity and bottom end.
the car is fuel injected if that makes any difference. cams slightly larger than gm's hot cam.
the car is fuel injected if that makes any difference. cams slightly larger than gm's hot cam.
Melting Slicks
Joined: Sep 2000
Posts: 3,099
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From: PITTSBURGH PA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: head opinion needed (neverendingproject)
too much for a mild 355 but for a warmed up one with gears it would work try and keep port down to 180 cc if you want mild :cheers:
Thread Starter
Pro
Joined: Jan 2003
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From: memphis tn
Re: head opinion needed (CORKVETTE1)
thanks cork,
the heads are actually brodix 197cc's. i wanted afr comp ported 180's w/ the vortec intake port. of course , even though AFR advertises them , they dont @#$%@ sell them and wont till the end of this year. brodix does though , with comparable flow, but their bigger ports.
i guess what i should have asked is, whats it gonna hurt to run these heads? how bad?
the heads are actually brodix 197cc's. i wanted afr comp ported 180's w/ the vortec intake port. of course , even though AFR advertises them , they dont @#$%@ sell them and wont till the end of this year. brodix does though , with comparable flow, but their bigger ports.
i guess what i should have asked is, whats it gonna hurt to run these heads? how bad?
Burning Brakes
Joined: Oct 2001
Posts: 1,146
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From: Milford NH
Re: head opinion needed (neverendingproject)
You can always use the real "Vortec" heads. Plenty of port velocity, still respectable flow. You may want a dual pattern cam becuase the exhaust ports don't flow so well. Edelbrock also make "Vortec" style heads in 170 and 200 cc port sizes.
Thread Starter
Pro
Joined: Jan 2003
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From: memphis tn
Re: head opinion needed (69stingray)
actually, that was the original plan. was gonna vortec the 85. got the intake heads, and all. now, im going aluminum on the 85, but i didn't want to buy another intake..
the vortecs are going to good use though, putting them on the 80 shortly.
the brodix heads are on the way. id still like to know how bad, if at all, the bigger ports will affect bottom end?
the vortecs are going to good use though, putting them on the 80 shortly.
the brodix heads are on the way. id still like to know how bad, if at all, the bigger ports will affect bottom end?
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: head opinion needed (neverendingproject)
They will probably reduce low rpm torque. They're likely to have sluggish throttle response below 3000-4000 rpms. Lack-luster around town performance. Good luck, ane...
RACE ON!!!
RACE ON!!!
Race Director
Joined: May 2000
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Re: head opinion needed (CFI-EFI)
LS1/6 heads have considerably larger than 200 cc ports and they don't suffer from lack of low end torque.
The requirement for FI and carbureted engines are very different (and the original poster said the engine has EFI). With a carbureted engine high port velocity is necessary to achieve good fuel vaporization and distribution. On an EFI engine even fuel distribution and good atomization to promote rapid vaporization are part of the deal.
For an EFI engine, free flowing heads and a moderate cam will provide excellent torque bandwidth and very good peak power.
Duke
The requirement for FI and carbureted engines are very different (and the original poster said the engine has EFI). With a carbureted engine high port velocity is necessary to achieve good fuel vaporization and distribution. On an EFI engine even fuel distribution and good atomization to promote rapid vaporization are part of the deal.
For an EFI engine, free flowing heads and a moderate cam will provide excellent torque bandwidth and very good peak power.
Duke
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Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Re: head opinion needed (neverendingproject)
I pondered the same question a couple of years ago. I went with 200's and was glad I did. Although I should taken gkulls advise and went with 215's.
:banghead:
:banghead:
Le Mans Master
Joined: Jan 2003
Posts: 6,298
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From: Tyler TX
Re: head opinion needed (SWCDuke)
LS1/6 heads have considerably larger than 200 cc ports and they don't suffer from lack of low end torque.
The requirement for FI and carbureted engines are very different (and the original poster said the engine has EFI). With a carbureted engine high port velocity is necessary to achieve good fuel vaporization and distribution. On an EFI engine even fuel distribution and good atomization to promote rapid vaporization are part of the deal.
For an EFI engine, free flowing heads and a moderate cam will provide excellent torque bandwidth and very good peak power.
Duke
The requirement for FI and carbureted engines are very different (and the original poster said the engine has EFI). With a carbureted engine high port velocity is necessary to achieve good fuel vaporization and distribution. On an EFI engine even fuel distribution and good atomization to promote rapid vaporization are part of the deal.
For an EFI engine, free flowing heads and a moderate cam will provide excellent torque bandwidth and very good peak power.
Duke