" machine down holley stealth base to fit"
Thread Starter
Racer
Joined: Aug 2005
Posts: 469
Likes: 1
" machine down holley stealth base to fit"
hi there guys,
can the holley stealth ram base where the plenum box fits too be machined/cut/lathed down one inch or so needed instead of getting new plenum box made so it will fit under corvette hood?
is it possible some how to do it?
will this ldea work or not?
what is the total height needed to clear the corvette hood with the stealth ram?
any ideas or help would be great!
thanks guys
cheers
glen
can the holley stealth ram base where the plenum box fits too be machined/cut/lathed down one inch or so needed instead of getting new plenum box made so it will fit under corvette hood?
is it possible some how to do it?
will this ldea work or not?
what is the total height needed to clear the corvette hood with the stealth ram?
any ideas or help would be great!
thanks guys
cheers
glen
Thread Starter
Racer
Joined: Aug 2005
Posts: 469
Likes: 1
i did contact frank r.e new plenum box thnaks larry to you but i was hoping to cut down on costs as frank wants $350.00 for new custom plenum box alone plus shipping!
i thought i might of been able to get the stealth base machined down in australia for less thats all mate!
thanks
glen
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
And, if you machine the base down you will lose your plenum bolt holes because the intake runners are flared on an angle heading toward the heads.
At 1st glance it looks like it will work but there are other issues.
Maybe I misunderstood Glen's post, but the base "to me" is the intake, and the plenum is the top.
Note also, that if you take 1" off the intake base, your runners are 1" shorter, making it closer to a Miniram runner length.
The simplest fix is what JOBY did, you just grind out the bottom of the plenum, like the pic above, and have it heli-arc welded to the intake, obviously,,,make sure it is leak free.
If you are on a budget, this would be my recommendation.
What I did on mine was merely just to try a different way that JOBY and yet still mainain the abiltiy to remove the plneum when I need to.
JOBY's plneum is "on for life"
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Oh yeah, FUN FACTS,
the HSR casting's older than 12/31/05 have less material at the intake port hole for porting
AND the pre 2005 AFPR's are known to be faulty in that when you adjust them, they do not move the fuel pressure smoothly,,, my AFPR is a POS.
I called Holley and spoke to tech dept about the AFPR and they said " yes the AFPR's are bad but we will only replace them if you have are receipt from buying it new"
I ported my HSR to a 1206 felpro, so the casting/porting issue only matters if yo plan on going to larger heads than a 1205 felpro.
So, buy a new HSR , grind and weld it like JOBY, get a small cap distributor, re-route your fuel lines, get a thermo housing that fits or cut down the factory vette thermo housing and re-weld it, and you are back on the road,
the HSR casting's older than 12/31/05 have less material at the intake port hole for porting
AND the pre 2005 AFPR's are known to be faulty in that when you adjust them, they do not move the fuel pressure smoothly,,, my AFPR is a POS.
I called Holley and spoke to tech dept about the AFPR and they said " yes the AFPR's are bad but we will only replace them if you have are receipt from buying it new"
I ported my HSR to a 1206 felpro, so the casting/porting issue only matters if yo plan on going to larger heads than a 1205 felpro.
So, buy a new HSR , grind and weld it like JOBY, get a small cap distributor, re-route your fuel lines, get a thermo housing that fits or cut down the factory vette thermo housing and re-weld it, and you are back on the road,
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Drifting
Joined: Aug 2001
Posts: 1,500
Likes: 0
From: Holliston MA
Cruise-In VII Veteran
I've done some work over the winter.
Also head my heads ported and gave the porter the intake to match to the intake port. I'd previously ported the base and matched the runners to a 1205 gasket. The real nice thing to hear was that the base caused zero loss in flow or increase in turbulence as compared to the heads with a radiused inlet only. Heads flowed 317 @ .700" lift on his bench. He didn't bother with the plenum because he didn't have the throttlebody.
Either Larry's or Joby's methods will get the plenum under the hood. Also my cylinder balance problems from last year had a lot to do with things other than the intake. Hopefully I'll have better info this year.
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
SloRvette;1558680718Are you talking about at the flange to the head ?
YES, Paul my flange to head would nto sealwithout having to add weld.
The real nice thing to hear was that the base caused zero loss in flow or increase in turbulence as compared to the heads with a radiused inlet only. Heads flowed 317 @ .700" lift on his bench. He didn't bother with the plenum because he didn't have the throttlebody.
Awesome info!
YES, Paul my flange to head would nto sealwithout having to add weld.
The real nice thing to hear was that the base caused zero loss in flow or increase in turbulence as compared to the heads with a radiused inlet only. Heads flowed 317 @ .700" lift on his bench. He didn't bother with the plenum because he didn't have the throttlebody.
Awesome info!
Team Owner
Joined: Mar 2001
Posts: 30,856
Likes: 293
From: Boston, Dallas, Detroit, SoCal, back to Boston MA
What's cutting the manifold down due to the peak RPM?
I've got a friend with a GT1 car that wants to switch to EFI. He asked at PRI but noone had anything that would pull the RPM he needed. 9,000+ on 303ci
I've got a friend with a GT1 car that wants to switch to EFI. He asked at PRI but noone had anything that would pull the RPM he needed. 9,000+ on 303ci
Drifting
Joined: Aug 2001
Posts: 1,500
Likes: 0
From: Holliston MA
Cruise-In VII Veteran
Brian, cutting down the runners would up the rpm range of the manifold.
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
"If" a Miniram is unable to get to 9000+ RPM, then I doubt the HSR can make it either, I could be wrong and have no experience with 9k revs.
Melting Slicks
Joined: Nov 2004
Posts: 2,799
Likes: 2
From: Cape Coral FL
Seriously... you're probably going to have to go with a modified singleplane manifold setup for that RPM range.
Intermediate
Joined: Dec 2002
Posts: 31
Likes: 0
From: Stockholm
A fellow swedish guy, Joby, did it like this:
http://www.joby.se/corvette/mods/2005-10-03_hsr/
Looks very nice IMHO
http://www.joby.se/corvette/mods/2005-10-03_hsr/
Looks very nice IMHO
Team Owner
Joined: Mar 2001
Posts: 30,856
Likes: 293
From: Boston, Dallas, Detroit, SoCal, back to Boston MA
Diabolic Dave cut one own to fit under the hood for his 427sb
http://diabolicalperformance.com/Dia...27Details.html
http://diabolicalperformance.com/Dia...27Details.html
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
[QUOTE=BrianCunningham;1558803898]Diabolic Dave cut one own to fit under the hood for his 427sb
QUOTE]
I could be wrong, but I'm pretty sure that Frank made the plenums for Grumpy before they broke up.
Also, I met Dave at the Mid America Funfest in 2005, a super, super nice guy, and a very vette-knowledgeable guy to boot
Lastly,,, skyvet, bought a Super ram I believe.
QUOTE]
I could be wrong, but I'm pretty sure that Frank made the plenums for Grumpy before they broke up.
Also, I met Dave at the Mid America Funfest in 2005, a super, super nice guy, and a very vette-knowledgeable guy to boot
Lastly,,, skyvet, bought a Super ram I believe.
