Using converted LT1 intake with GM FastBurn Heads
Le Mans Master
Joined: May 2004
Posts: 5,386
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I have seen postings of using an LT4 manifold. The LT1 manifold may work as well and I believe the fastburns have duel bolt patterns incorporated into the design. Other than that I believe the miniram III is designed to work with fastburns.
Safety Car
Joined: Jun 2003
Posts: 4,250
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From: San Diego Ca
That must be new GM technology to use alternate fuels....I am referring to the fartburn heads you had.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
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From: Houston Texas
look
Stock TPI bolted to Fastburn heads
http://forums.corvetteforum.com/c4-t...urn-heads.html
http://www.gmhightechperformance.com...d/viewall.html
Safety Car
Joined: Jan 2004
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Team Owner
Joined: Aug 2004
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From: Park City Utah
Compared to all SBC's 1955->L98, I'm pretty sure that the LT1 port is raised -similar to, if not identical to, the L31 Vortec head. The LT4 port is raised...even more. Where the Fastburn heads fall, I don't know.
According to Vetteoz's link, the heads are designed to work with the L31 Vortec heads...which to ME, I'd think that would also mean that they'd be a good match for the LT1 intake. No?
According to Vetteoz's link, the heads are designed to work with the L31 Vortec heads...which to ME, I'd think that would also mean that they'd be a good match for the LT1 intake. No?
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
Compared to all SBC's 1955->L98, I'm pretty sure that the LT1 port is raised -similar to, if not identical to, the L31 Vortec head. The LT4 port is raised...even more. Where the Fastburn heads fall, I don't know.
According to Vetteoz's link, the heads are designed to work with the L31 Vortec heads...which to ME, I'd think that would also mean that they'd be a good match for the L'm just going by what I hT1 intake. No?
According to Vetteoz's link, the heads are designed to work with the L31 Vortec heads...which to ME, I'd think that would also mean that they'd be a good match for the L'm just going by what I hT1 intake. No?
Another think to consider is the Exhaust ports are also raised/and bigger. I had to go from headman headers to LT1 manifolds when I switched over.
Le Mans Master
Joined: May 2006
Posts: 7,708
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From: indy indiana
I have a set of "062" vortec heads mounted on an engine I am building. They do NOT have the raised ports, or the "steeple ports" of the LT whatever. They simply have a 4 bolt mounting system for the manifold intake instead of the more familiar 8 bolt system.
Team Owner
Joined: Aug 2004
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From: Park City Utah
The Vortec truck heads do have "raised ports" compared to older "non vortec" heads. Here is a Vortec head bolted with a "non-vortec" intake. Runner is raised. Raised as much as an LT4 intake? Or fastburn? I don't know.
Race Director
Joined: Jan 2002
Posts: 12,263
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From: O'Fallon Missouri
The LT1 intake and LT4 intake have identical port locations and dimensions. The difference is the LT4 intake has more material on the port roofs that GM for what ever reason didn't port match to the LT4 heads.
Melting Slicks
Joined: Jan 2009
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From: folsom california
"The aluminum heads used on the LT4 have intake port openings that are .100" higher than those found on other Gen. II heads and require a Gen II LT4 intake manifold with matching raised runners and LT4 gaskets"; CHEVROLET SMALL BLOCK PARTS INTERCHANGE MANUAL @ page 19; some internet research will produce pictures of LT1 and LT4 head and intake manifold combo's that clearly show their differences.
Allegedly the reason for the extra material in the port roof was to reduce port volume and keep LT4 horsepower down in order to not embarrass the soon to be released LS1
Team Owner
Joined: Aug 2004
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From: Park City Utah
Sooo... is the fastburn head a "raised port" as in LT1/Vortec raised? Or a "wicked mega raised port", as in the LT4 with at massive .1" more "raise"?
If it were ME, I'd take the gamble that LT1 heads work with GB heads.
If it were ME, I'd take the gamble that LT1 heads work with GB heads.
Safety Car
Joined: Jun 2003
Posts: 4,250
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From: San Diego Ca
Hmm, I can't see that was a real worry. The LS1 heads flow SO much better than the LT1/4 that it was no contest. Stock LT1/4s were in the 265 rwhp range while early LS1s were in the 300-305 rwhp range (Lou Gigliotti's first LS1 was dynoed the day he got it at 305) and 314.6 rwhp (my very early delivery LS1 was dynoed the day after delivery and 2 days after Lou received his).
Le Mans Master
Joined: Oct 2008
Posts: 9,758
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From: Houston Texas
The LT4 is a raised design and the Fastburns are based on CNC ported LT4 heads that means the ports are going to be even bigger and the LT1 intake if it bolts up will block the top of the ports. If I were the OP I would sell the converted intake and get an HSR or Miniram.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I'm with you that they might seal up and work. But, would you buy performance heads then block the top of the port?
The LT4 is a raised design and the Fastburns are based on CNC ported LT4 heads that means the ports are going to be even bigger and the LT1 intake if it bolts up will block the top of the ports. If I were the OP I would sell the converted intake and get an HSR or Miniram.
The LT4 is a raised design and the Fastburns are based on CNC ported LT4 heads that means the ports are going to be even bigger and the LT1 intake if it bolts up will block the top of the ports. If I were the OP I would sell the converted intake and get an HSR or Miniram.
It sounds like the solution is porting the LT1 intake or and LT4 converted intake as the poster above mentioned.
Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
OK, once again for the non-believers/"mtwoolford".
"The LT4 intake (12550630 or 12550631) has identical runners to the late model LT1 intake (12552137 or 12552138)"
http://www.grandsportregistry.com/lt1vslt4_intakes.htm
"The LT4 intake (12550630 or 12550631) has identical runners to the late model LT1 intake (12552137 or 12552138)"
http://www.grandsportregistry.com/lt1vslt4_intakes.htm