Lt1 heads VS Vortec heads
#1
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Lt1 heads VS Vortec heads
in a comparison to both, are they equal in flow, or do the VORTEC
outflow the lt1 heads. I hear these vortec heads are suppose to
be awesome for perfromance use. Anybody have any idea??
outflow the lt1 heads. I hear these vortec heads are suppose to
be awesome for perfromance use. Anybody have any idea??
#3
The LT1 prospered from 1992 to 1996 in various vehicles, but its days were numbered. In 1997, GM released its Third-Generation small-block engine, the LS1. While the new Corvettes and Camaros were about to receive yet another cylinder head breakthrough, the engineers at GM’s truck division knew that the LT1 port still had something to offer. Subsequently, the ’96 truck engine series hit the market with the infamous LT1 port in cast-iron production. It was called the Vortec design and became the most efficient mass-produced small-block Chevy cylinder head ever created.
#5
That doesn't sound right at all. . . I've seen stock LT1 castings flow 190 cfm and stock Vortec castings flow 235 cfm. That's a pretty big difference if you ask me. I think the Vortec's might be closer to LT4 numbers.
Now I'd like to convert some Large-port Vortec's over to use on my LT1, mainly for the reduced timing requirement. I could run more boost on pump gas if I made optimum power at 28 deg timing.
Mike
Now I'd like to convert some Large-port Vortec's over to use on my LT1, mainly for the reduced timing requirement. I could run more boost on pump gas if I made optimum power at 28 deg timing.
Mike
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Originally Posted by engineermike
That doesn't sound right at all. . . I've seen stock LT1 castings flow 190 cfm and stock Vortec castings flow 235 cfm. That's a pretty big difference if you ask me. I think the Vortec's might be closer to LT4 numbers.
Now I'd like to convert some Large-port Vortec's over to use on my LT1, mainly for the reduced timing requirement. I could run more boost on pump gas if I made optimum power at 28 deg timing.
Mike
Now I'd like to convert some Large-port Vortec's over to use on my LT1, mainly for the reduced timing requirement. I could run more boost on pump gas if I made optimum power at 28 deg timing.
Mike
FLOW @ 28" H2O
Stock:
Lift -- Intake -- Exhaust
0.100 -- 69.8 -- 53.9 -- 77%
0.200 -- 138.5 -- 112.5 -- 81%
0.300 -- 195.9 -- 148.0 -- 76%
0.400 -- 231.0 -- 159.0 -- 69%
0.500 -- 232.2 -- 161.6 -- 70%
0.600 -- 236.6 -- 165.8 -- 70%
These are the published numbers in an older car craft for the Vortec Heads
Lift I (cfm) E (cfm)
0.200 127 98
0.300 185 137
0.400 217 153
0.500 224 157
0.600 228 158
you really have to flow bench them on the same flow bench to be able to compare them
http://www.chevyhiperformance.com/howto/97458/
also note a small and a large port size Vortec head are available.....185cc and 215cc intake ports respectively
Last edited by buffman; 05-16-2006 at 11:43 PM.
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#9
There was a post about this on camaroz28.com, and I posted the dyno #'s for a "Fast Burn" head, (which is the successor to the Vortec), vs. an LT1 head:
http://web.camaross.com/forums/showp...72&postcount=6
Then another guy pointed out that the flow #'s in that chart were for a set of prototype heads. The actual head flow #'s can be found here:
http://www.sallee-chevrolet.com/fram...der_Heads.html
According to this link, the same company got 430hp/430tq out of a Hotcam with the production, (lower flowing) heads straight out of the box:
http://www.sallee-chevrolet.com/fram...der_Heads.html
I wonder what the power output would have been if the heads would have been ported to flow the same as the prototype model? (275/int 193/exh)
http://web.camaross.com/forums/showp...72&postcount=6
Then another guy pointed out that the flow #'s in that chart were for a set of prototype heads. The actual head flow #'s can be found here:
http://www.sallee-chevrolet.com/fram...der_Heads.html
According to this link, the same company got 430hp/430tq out of a Hotcam with the production, (lower flowing) heads straight out of the box:
http://www.sallee-chevrolet.com/fram...der_Heads.html
I wonder what the power output would have been if the heads would have been ported to flow the same as the prototype model? (275/int 193/exh)
#10
Wow! Those numbers are VERY dissappointing for a 210 cc head. That sure explains a turd we had on the dyno a few months back. . .
I hope the new Vortec large-port (206 cc) isn't that bad. They're advertised to flow around 270 on the intake.
http://www.chevyhiperformance.com/te...er/index1.html
I hope the new Vortec large-port (206 cc) isn't that bad. They're advertised to flow around 270 on the intake.
http://www.chevyhiperformance.com/te...er/index1.html
#12
Originally Posted by thesoundandthefury
What was it?
#13
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Originally Posted by engineermike
I don't remember all the details, but I think it was a 383, FastBurn heads, 230-ish hydraulic roller, 9/1 compression, carbureted, etc. . . It barely broke 350 hp on an engine dyno. We were expecting 450+.
im sure that the 9:1 comp didnt help. what do you think it would have put down with say 12:1?
anthony
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Originally Posted by 6 spd LT1
im sure that the 9:1 comp didnt help. what do you think it would have put down with say 12:1?
anthony
anthony
I agree 100%
Last edited by SPACECITY; 05-17-2006 at 12:29 PM.