Patriot LT1 Heads
07-14-2009, 02:54 PM
#42
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So you aren't going to port the stock heads? I'd say that with 3.73's, a 3600 Vig, and CC503 with full bolt-on's that you'd be happy and that the car would also drive well
07-15-2009, 10:49 AM
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07-15-2009, 12:30 PM
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07-15-2009, 12:44 PM
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07-15-2009, 01:56 PM
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Comp's RPM ranges are all drasticly lower than reality. Best guess is they based them off of the rpm ranges the cams would need if put in a gen 1 motor with long intake runners bringing the rpm band down compared to the LT1 ultra short runners. The 503 is going to need to see over 6300 with any decent head.
Your own misconceptions about what is aggressive and what is not, your inability to understand quality vs. popularity/marketting are all going to stop you from pulling this off with any level of success. My advise is put off modifying the car another year, maybe see if you can find someone around with a modified car to let you get some idea of what it will be like.
There was a time when I was scared of a little rpm and stall, and gears, it was all lack of experiance that lead to my concern. 6300 or so is NOT high rpms for an LT1, the factory gears lug the motor doing more harm than good a moderate upgrade there makes the car drive BETTER without affecting fuel economy.
I actually did a mild cam swap with stock gears and stall and that was a MISTAKE. My overworrying about all the things you are worrying about has lead to me buyiong the same basic parts over and over again. Several sets of rockers, several sets of springs, a few cams, several torque converters, multiple gear ratios. The list goes on and on. Wasted a ton of money. If I could have gotten to ride along in some modified cars first and gotten a better handle on exactly what 3.73 gears felt like instead of 2.93 I would have been more likely to try them first, or what a GOOD torque converter felt like at a decent stall. These days there is a 3400 in it and the alignment shop guys were surprised they said if anything the car felt like it wanted to GO not that it was sloppy like most expect from that much stall.
If you can get past your concerns about making it a "drag" car by getting some time in other people's cars it will save you a LOT of time and money. My car gets dismissed as a drag car by those who have never seen it because of the performance. Those who are local and know the car see it leaving for work at 5:15 in the morning, not a "drag" car though I do take it to the track.
Your own misconceptions about what is aggressive and what is not, your inability to understand quality vs. popularity/marketting are all going to stop you from pulling this off with any level of success. My advise is put off modifying the car another year, maybe see if you can find someone around with a modified car to let you get some idea of what it will be like.
There was a time when I was scared of a little rpm and stall, and gears, it was all lack of experiance that lead to my concern. 6300 or so is NOT high rpms for an LT1, the factory gears lug the motor doing more harm than good a moderate upgrade there makes the car drive BETTER without affecting fuel economy.
I actually did a mild cam swap with stock gears and stall and that was a MISTAKE. My overworrying about all the things you are worrying about has lead to me buyiong the same basic parts over and over again. Several sets of rockers, several sets of springs, a few cams, several torque converters, multiple gear ratios. The list goes on and on. Wasted a ton of money. If I could have gotten to ride along in some modified cars first and gotten a better handle on exactly what 3.73 gears felt like instead of 2.93 I would have been more likely to try them first, or what a GOOD torque converter felt like at a decent stall. These days there is a 3400 in it and the alignment shop guys were surprised they said if anything the car felt like it wanted to GO not that it was sloppy like most expect from that much stall.
If you can get past your concerns about making it a "drag" car by getting some time in other people's cars it will save you a LOT of time and money. My car gets dismissed as a drag car by those who have never seen it because of the performance. Those who are local and know the car see it leaving for work at 5:15 in the morning, not a "drag" car though I do take it to the track.
