I need a quick answer on heads!!!
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Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
I need a quick answer on heads!!!
I am going to go .030" over with my 350 to 355inch. I have a first intake and will be going with a new cam of my choice and pistons of my choice. I am looking at selling my almost new trick flow 175cc heads and buying a new set to accomidate more flow. Will a 190cc be too much. I will be porting my intake if needed. Any and all input is welcome. Either PM me or message back asap.
Melting Slicks
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From: Palm Beach
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Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
Yah lots of guys run 195's with bigger cubes, super rams or mini rams (shorter/larger runner systems). Do you think it will work with my FIRST TPI intake. It has very large runners, and they are a little shorter than the factory ones. I dont see an issue, but I just want some of the guru's onboard and juniors with experience to give me a yay or nay/ opinion on my choice.
Pro
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From: Near Lockport NY Black 1986 Coupe
Just a little out of my current price range, and considering I can buy a brand new set for roughly that much I'll have to pass. If you'd be willing to reconsider & provide some flow #s/casting # info, I could possibly offer you $600 USD for them.
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Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
Yah sometimes I wish I lived in the US just for the performance parts pricing. I will keep that in mind. I thought I had them sold up here, but things didnt go acording to plan.
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Thread Starter
Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
I havent decided on anything yet. I still want to go 355 ci. I just need to know if 180 cc heads will be enough, will my TFS 175cc be fine with a light port job. And a little advice on a cam. Here is links to both the flow #'s on the heads aswell as current cam specs. I think I may be able to stay with my current cam.
http://static.trickflow.com/global/i...%2C030bore.pdf
http://www.compcams.com/Cam_Specs/Ca...?csid=208&sb=0
Any Advise?
http://static.trickflow.com/global/i...%2C030bore.pdf
http://www.compcams.com/Cam_Specs/Ca...?csid=208&sb=0
Any Advise?
Pro
Joined: Jan 2008
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From: Near Lockport NY Black 1986 Coupe
That's quite a big cam you're looking at there.. those heads would be better for a milder lift of .520-.530 but that cam would require a heavy port job to make use of those heads. What lift are the springs in the heads rated for? I think TrickFlow went from .480-.540-.600 increments.
I don't know your current financial situation, or other mods you've done to the car, but to be safe I'd back off to a .530 lift cam with slighter lower duration for the low-end torque & keep the 175 heads while possibly doing a touch-up port job on them. I'm not all too familiar with the FIRST intake so maybe that's a decent RPM range, and you've got a lot of support with roller cams as every brand has several selections for them, so come up with a game plan and get back to us on it.
I don't know your current financial situation, or other mods you've done to the car, but to be safe I'd back off to a .530 lift cam with slighter lower duration for the low-end torque & keep the 175 heads while possibly doing a touch-up port job on them. I'm not all too familiar with the FIRST intake so maybe that's a decent RPM range, and you've got a lot of support with roller cams as every brand has several selections for them, so come up with a game plan and get back to us on it.
Thread Starter
Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
That's quite a big cam you're looking at there.. those heads would be better for a milder lift of .520-.530 but that cam would require a heavy port job to make use of those heads. What lift are the springs in the heads rated for? I think TrickFlow went from .480-.540-.600 increments.
I don't know your current financial situation, or other mods you've done to the car, but to be safe I'd back off to a .530 lift cam with slighter lower duration for the low-end torque & keep the 175 heads while possibly doing a touch-up port job on them. I'm not all too familiar with the FIRST intake so maybe that's a decent RPM range, and you've got a lot of support with roller cams as every brand has several selections for them, so come up with a game plan and get back to us on it.
I don't know your current financial situation, or other mods you've done to the car, but to be safe I'd back off to a .530 lift cam with slighter lower duration for the low-end torque & keep the 175 heads while possibly doing a touch-up port job on them. I'm not all too familiar with the FIRST intake so maybe that's a decent RPM range, and you've got a lot of support with roller cams as every brand has several selections for them, so come up with a game plan and get back to us on it.
Thread Starter
Racer
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From: DRAYTON VALLEY ALBERTA
That combined with a few more cubes is probably where I want to be. I just want to have a fresh bottom end aswell as the top end. The motor only has 160000 kms on it but what the heck it cheep enough to do. Also I broke a front timing cover bolt off, and it would be easier to do with the motor out, so I should just go for it.
Race Director
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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Comp says their XE lobes are slightly less aggressive -- plus they have an XE cam with essentially the same specs as the 268 XFI. And, there's a high-lift magnum lobe that's one step down from that.
The 195's wouldn't be too big -- if you wanted to go that route. In fact, they could give you a nice bump from 4k rpms on up. Keep in mind, that FIRST is designed to breath for a 400+ci motor. BADSS said it runs with stealth ram (minus 1 or 2 tenths). And, with a stealth, there's no way I wouldn't consider the 195s.
OTOH, if you were ready to swap heads (and pay extra for it), going for a 383 while the block is apart is another option. If mid-range torque is more important (to you) than top-end speed, those 175's with a 383 probably wouldn't disappoint you in mid-range rpms. If you did that, a little more cam wouldn't hurt.
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Racer
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From: DRAYTON VALLEY ALBERTA
I would agree with that -- especially if the springs can handle the XFI cams. (Call TFS is you want to dbl-chk that.) Some call the XFI lobes awfully aggressive, others don't worry. IMO, that can be a product of one's goals.
Comp says their XE lobes are slightly less aggressive -- plus they have an XE cam with essentially the same specs as the 268 XFI. And, there's a high-lift magnum lobe that's one step down from that.
The 195's wouldn't be too big -- if you wanted to go that route. In fact, they could give you a nice bump from 4k rpms on up. Keep in mind, that FIRST is designed to breath for a 400+ci motor. BADSS said it runs with stealth ram (minus 1 or 2 tenths). And, with a stealth, there's no way I wouldn't consider the 195s.
OTOH, if you were ready to swap heads (and pay extra for it), going for a 383 while the block is apart is another option. If mid-range torque is more important (to you) than top-end speed, those 175's with a 383 probably wouldn't disappoint you in mid-range rpms. If you did that, a little more cam wouldn't hurt.
Comp says their XE lobes are slightly less aggressive -- plus they have an XE cam with essentially the same specs as the 268 XFI. And, there's a high-lift magnum lobe that's one step down from that.
The 195's wouldn't be too big -- if you wanted to go that route. In fact, they could give you a nice bump from 4k rpms on up. Keep in mind, that FIRST is designed to breath for a 400+ci motor. BADSS said it runs with stealth ram (minus 1 or 2 tenths). And, with a stealth, there's no way I wouldn't consider the 195s.
OTOH, if you were ready to swap heads (and pay extra for it), going for a 383 while the block is apart is another option. If mid-range torque is more important (to you) than top-end speed, those 175's with a 383 probably wouldn't disappoint you in mid-range rpms. If you did that, a little more cam wouldn't hurt.
Thread Starter
Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
OK I was thinking of a set of Patriot heads 190cc,which are 2.02, 1.60heads, on a 355ci motor, with existing 08-466-8 cam. I am going to open the intake up to gasket match(both runners and lower). What is your thoughts on that. I am still planning on the 10.5:1 range. I can go stroker I guess. Its just another big expense.
Last edited by 87stocker; Sep 11, 2009 at 06:20 PM.
Race Director
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
OK I was thinking of a set of Patriot heads 190cc,which are 2.02, 1.60heads, on a 355ci motor, with existing 08-466-8 cam. I am going to open the intake up to gasket match(both runners and lower). What is your thoughts on that. I am still planning on the 10.5:1 range. I can go stroker I guess. Its just another big expense.
Thread Starter
Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
There is a 190cc. Link belowThey are a 64cc combustion chamber. Why cant I make 10.5:1. All I need is a flat top pistion. Or am I missing somthing else that was mentioned?
https://www.patriot-performance.com/...5&cat=0&page=1
https://www.patriot-performance.com/...5&cat=0&page=1
Last edited by 87stocker; Sep 12, 2009 at 04:12 PM.
Thread Starter
Racer
Joined: Aug 2007
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From: DRAYTON VALLEY ALBERTA
With the flow #s provided and proof from my speed shop that this is acurate to within 1cfm of posted spec and my cam, and my First Intake. Would I be best suited for a 383 or can I get away with a 355. I have started budgeting both and the price is not that different. Thoughts??