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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 4:22 pm Post subject: 305 hop-up |
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I have just aquired some 062 casting vortec heads I want to put them on my current TBI 305 and get a cam that works well with them. I have a few questions that im having trouble finding answers to.
I know I'll need a vortec specific manifold, And I know any carb intake with a TBI adapter will work BUT, will a single plane or dual plane work better?
Also I've read that compression will go down to much unless I get these heads milled down, but I haven't been able to find out how much they need to be milled for good use on a 305.
And of course the cam, this will still be my daily driver once it's all done, I was thinking of one with specs like this one:
http://www.summitracing.com/parts/LUN-501A1LUN/
Anything I should be worried about? _________________
'88 FORMULA |
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RSFreak The other "John"
Joined: 23 Jan 2004 Posts: 2946 Location: Renton
1989 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 4:37 pm Post subject: |
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Talk to Dewey. _________________ '86 Trans Am - 5.0L TPI - LT1 cam - 700R4 - WS6
'85 Camaro Berlinetta - IROC clone
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 4:55 pm Post subject: |
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I wanna talk to everybody lol. But that cam is pretty much just like dewey's. figured that it worked great for his combo. |
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Twilightoptics Hardcore (12sec Club)
Joined: 13 Jan 2004 Posts: 9191 Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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Posted: Thu Mar 24, 2011 5:18 pm Post subject: |
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Single plane with TBI will net more top end. Not MUCH sacrifice on the low end.
Find a TBI specific Vortec manifold IMHO. Otherwise hood clearance might be a premium. _________________ A redline a day keeps the carbon away! |
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Dewey316 The Lama
Joined: 08 Jan 2004 Posts: 7295 Location: Bringing the tech
1990 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 5:22 pm Post subject: |
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I think that is the exact same cam I have, at at least VERY close. Since my cam designer worked for Lunati for a while.
You know the numbers my car makes, if you want a little more there are several good cams that work, I think the 210-215* intake range should go very well in your car. For a bit much agressive grind than mine, this one looks pretty nice.
http://www.summitracing.com/parts/LUN-60110/
Just make sure your Votecs are machined to take the extra lift, and get the right springs. |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 5:31 pm Post subject: |
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That is another thing, how do I choose the right springs? |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Thu Mar 24, 2011 5:49 pm Post subject: |
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There should be a spring recommendation with whatever cam you choose. Make sure they fit your heads. If you do choose a lunati cam however.. I have NOT had good luck with their springs. I've broken 7 or 8 of them in my truck over a 3 year period. Last year I bought a set of summit branded springs that are spec'd similarly. So far so good. Since summit owns trick flow.. i think they're probably trickflow springs(which will actually be made by someone else yet LOL) |
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91RSVert Member
Joined: 16 May 2007 Posts: 2736 Location: AR
1991 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 6:49 pm Post subject: |
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I know a few vans had vortecs and TBI. Start looking in the junkyards. |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Thu Mar 24, 2011 6:58 pm Post subject: |
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91RSVert wrote: | I know a few vans had vortecs and TBI. Start looking in the junkyards. |
Sorry.. I hit quote but with my mad moderator powers it edited your post! LOL
Anyway.
Vortec motors were CPI, as far as I know all tbi motors got the swirl port heads under them. |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 8:13 pm Post subject: |
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The intake that GMPP makes is $400 bucks
I may have to run a carb intake to cut cost... |
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Al Hasse Member
Joined: 19 Nov 2005 Posts: 4379 Location: Bremerton, WA
1992 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 8:46 pm Post subject: |
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I have a similar intake going on my new motor. It's a Vortec to match the heads and made for TBI, and costs a little more. _________________ 92 Camaro
89 Camaro
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 9:07 pm Post subject: |
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Dang, what kind is that Al? the only one on Summit is that GMPP. |
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Al Hasse Member
Joined: 19 Nov 2005 Posts: 4379 Location: Bremerton, WA
1992 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 9:14 pm Post subject: |
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Don't know the brand offhand, the builder selected it for me specifically for the heads and throttle body. |
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Dewey316 The Lama
Joined: 08 Jan 2004 Posts: 7295 Location: Bringing the tech
1990 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 9:40 pm Post subject: |
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I would try to find a low-rise single plane intake for vortecs, and forget a TBI specific intake. The single plane is the ticket IMHO.
Ohhh...and spray that bad girl! |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 9:43 pm Post subject: |
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Oh I see, do you the specs on your cam off hand? I know yours is going to be a 383 but still should be similar. |
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Al Hasse Member
Joined: 19 Nov 2005 Posts: 4379 Location: Bremerton, WA
1992 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 9:48 pm Post subject: |
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I left that for the builder to decide, and he hasn't yet. I'll have a data-sheet for the motor when delivered which will have all the important stuff on it. I'll post the particulars when I get it. |
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Dewey316 The Lama
Joined: 08 Jan 2004 Posts: 7295 Location: Bringing the tech
1990 Chevrolet Camaro RS
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 9:56 pm Post subject: |
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I did see that one, it's a decent price too. its a little more than 6 inches high, I'll have to measure the stock one and see how much room I've got. |
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Dewey316 The Lama
Joined: 08 Jan 2004 Posts: 7295 Location: Bringing the tech
1990 Chevrolet Camaro RS
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Posted: Thu Mar 24, 2011 10:00 pm Post subject: |
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Yeah, that seems a little. I did a quick google, and the Weiand I have, they say is 4.5" height at the back, 3.5" at the front. I'm not sure where the summit one is measured. But, i also have a nitrous plate, and the thicker style of adapter. With a thin plate, you could probably run a 5.5" okish with a 3 filter. The problem with TBI, is the stupid air cleaner bolt won't allow you to run much lower than a 3" element with a drop base, since with the taller intakes, you will need to remove the spacer ring, and then cut the top off the bolt. |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Thu Mar 24, 2011 10:08 pm Post subject: |
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I think I have a 3" filter on there now, along with a TBI spacer. That'll have to go for sure.
Why is it that single plane intakes usually have a much higher RPM range like 3,000-up? |
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