Looking to eek out a few more horsepower.

When I put the MiniRam on, I didn't gasket match the heads to the manifold. Right now, the manifold is about .050 per side smaller than the head- especially since AFR has a huge radius in the roof.

Would it be worth it to to this? Anyone ever done an A-B comparison of gasket-matched to non-gasket-matched?

Also, anyone have some tips for doing this while the heads are on the car (other than the obvious thing of covering up all of ports and oil holes to keep out debris)?

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Pro-Touring 71

1996 LT4 Corvette Wheels are 17x8.5 front, 17x9.5 rear
Wheel adapters are 2.0" front, 2.5" rear
Baer Brakes four wheel discs
Fuel Injected ZZ4, custom burned EPROM, AFR heads, TPIS Mini-Ram intake,
Comp Camshaft, TH700R4 Transmission.
God Bless the USA
Project Photos on ULTM8Z project photo album (http://photos.yahoo.com/ultm8z)
See me in Chevy High Performance (http://chevyhiperformance.com/featuredvehicles/86018/)
ULTM8Z Website (http://www.ultm8z.com)

I did not do it on my Super Ram on my small block they were pretty close to both the head & the lower.

But on the new Vic Jr. for my BBC, it was way off & it made quite a bit of sense for me. I dunno if it made any difference, but I cant imagine that it wont, just based on how wrong it was. its aluminum & even with my crappy grinder it went pretty swimmingly.

Bob

Since your intake is slightly small than your head it would be a waste of time.

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70 SS 454 CI Dynoed 684 HP, 702 TQ All Aluminium Fuel Injected Small Block , plus 200 - 500 HP NX nitrous system.

Rick, the manifold is actually bigger than the head. That's my concern.

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Pro-Touring 71

1996 LT4 Corvette Wheels are 17x8.5 front, 17x9.5 rear
Wheel adapters are 2.0" front, 2.5" rear
Baer Brakes four wheel discs
Fuel Injected ZZ4, custom burned EPROM, AFR heads, TPIS Mini-Ram intake,
Comp Camshaft, TH700R4 Transmission.
God Bless the USA
Project Photos on ULTM8Z project photo album (http://photos.yahoo.com/ultm8z)
See me in Chevy High Performance (http://chevyhiperformance.com/featuredvehicles/86018/)
ULTM8Z Website (http://www.ultm8z.com)

<font face="Arial,Verdana" size="2">Originally posted by ULTM8Z:
Rick, the manifold is actually bigger than the head. That's my concern.

</font>

I would gasket-match it, especially in that case.

Roger 'Dr. Air' Helgesen (highly respected head-porter) once wrote in an article that he used to feel gasket-matching was a waste of time. To quote him, he says "turns out, I was a little bit wrong about that."



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'Silver Bullet' 1977 Z-28 413" SB
11.73 @ 115.10 and dropping...
Old Vortec combo:
12.15 @ 110.52
1989 GTA L98
Daily driver

AFR has something on their website about gasket matching small block heads but I don't remember what it is.I didn't bother with mine.

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1978 Z-28 purchased new by me -$6750
Click here (http://f1.pg.photos.yahoo.com/ph/someonehasthisid/detail?.dir=/d752&.dnm=aefd.jpg) to view present state photo
Look above for glory days.
1994 Formula
1982 350 S-10

AFR says to NOT gasket match to some specific intake gaskets. FOR SURE get the whole info before you do anything.

Stepping out to a larger port in the head is not a huge issue, but stepping DOWN to a smaller runner in the head creates a 'dam' that significantly disturbs flow. I am a little surprised at this problem. I have a Holley ProDominator tunelram, 2 SuperVictors and a Vic Jr,, ALL of them are smaller than the ports in the 210's or 220's

Just got of the phone with a tech guy at AFR. "Definitely port match that thing", he said. I have a week off between Christmas and New Years, so I know what I'll be doing for one of those days! http://www.nastyz28.com/ubb/biggrin.gif


EDIT: Marv, just saw your post. I paraphrased what the tech guy said. In actuality, he did mention your concern. However, he said that in my case, I definitely want to port match to avoid having that "dam" effect. Also, he did in fact say not to match to a particular gasket- as it also says on their website.
------------------
Pro-Touring 71

1996 LT4 Corvette Wheels are 17x8.5 front, 17x9.5 rear
Wheel adapters are 2.0" front, 2.5" rear
Baer Brakes four wheel discs
Fuel Injected ZZ4, custom burned EPROM, AFR heads, TPIS Mini-Ram intake,
Comp Camshaft, TH700R4 Transmission.
God Bless the USA
Project Photos on ULTM8Z project photo album (http://photos.yahoo.com/ultm8z)
See me in Chevy High Performance (http://chevyhiperformance.com/featuredvehicles/86018/)
ULTM8Z Website (http://www.ultm8z.com)

[This message has been edited by ULTM8Z (edited December 21, 2004).]

Maybe I should have re-phrased my post to say "port match" vs. "gasket-match." Some gaskets are too big and you can wreck an intake port trying to make the two match. With the mis-match you have their I would port the head to match the larger intake manifold port.

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'Silver Bullet' 1977 Z-28 413" SB
11.73 @ 115.10 and dropping...
Old Vortec combo:
12.15 @ 110.52
1989 GTA L98
Daily driver

I think that's where we were all going ultim8. If someone has gasket matched this intake, be VERY cautious in what you do. I think I'd lay a 1205 (for 210's and 220's) or 1206 for 180 and 190's) gasket against the intake and see how things look. Those gaskets are 'safe' sizes as i understand it. (Just don't reach too far into the runner trying to smooth things out) Blend it and move on. Try to stay away from the floor of the runner as much as possible to not spoil the port design, and pay attention to where the water jackets are. There is quite a bit of meat on these heads, just don't go hog-wild.

You asked about doing this on the car. I WOULDN'T!! You really need to disassemble and clean the heads THOUROUGHLY anyways. You can't believe how that aluminum dust finds it's way into EVERYTHING with a high speed grinder.

[QUOTE] I'd lay a 1205 (for 210's and 220's) or 1206 for 180 and 190's) QUOTE]

??? Aren't these PN reversed or does AFR do things backward ???

The 1205s are 1.28 x 2.09
The 1206s are 1.34 x 2.21

Gotta keep you honest Marv.. http://www.nastyz28.com/ubb/wink.gif



[This message has been edited by HEAVYchev (edited December 21, 2004).]

Just a little anal - cranium inversion. Thanks for helping me hear the "kerPoPPP! oF my head coming out of my ...... http://www.nastyz28.com/ubb/wink.gif
sheeeeze! Thanks Bill