LT4 vs. 03 Cobra
Originally Posted by 346Vette
Crappy Manifolds. I had to replace one of them because it cracked. Its the same manifold they have been putting on SBC for years. Yeah I definately didnt create the vid, the cobra owner did, hence the excuses before each race... lol.
Man I bet that thing will fly with some LTs
Originally Posted by 346Vette
Ported LT4 heads or ported LT1 heads? If they are LT1, even ported, they probably won't flow as good. LT4's out flow LS1's by a good 20-30cfm. Its a completely different design and cast.
LT4's flow around 240 stock vs LT1 212. http://www.grandsportregistry.com/lt1vslt4.htm
LS1's flow around 220-240 depending on the casting.
https://ls1tech.com/forums/generation-iii-internal-engine/95538-flow-s-stock-heads.html
1.7RR's will also make my lift about .510/.520 vs .476/.479 for LT4
I've seen bolt-on LT4's claim around 330-335 rwhp with just headers and intake, so if I hit that or more I would be happy.
Originally Posted by aboatguy
Good job. A long while back I posted that I spanked my brother in laws stock 03 Cobra with my LT1 A4 vette and lots of people didn't believe me.
My only mods at the time were headers/high flow cats, and replaced the D36 with 2.59s with a D44 and 3.45s. Stock Cobras are not that fast, modded Cobras may be a different story.
Mike
My only mods at the time were headers/high flow cats, and replaced the D36 with 2.59s with a D44 and 3.45s. Stock Cobras are not that fast, modded Cobras may be a different story.
Mike
Nice race man you did big.
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\\The LT4s come stock with bigger valves than the stock LT1s.
My LT1s flow better than 265 and I'm only a 190cc intake runner 2.00/1.56 valve.
LPE (a well known reputable shop) only advertises a 5 hp difference between their 350 LT1 and the LT4 package and 10 for the 383.
http://www.lingenfelter.com/pack_cor_c4_383.htm
I will admit that for a stock SBC the LT4 rocked, but it had a lot of little advantages over a stock LT1 (ie some of the supporting mods were done at the factory ... bigger lighter valves, roller rockers, higher compression......)
Now when it comes to mod ability the LSXs have us LTX guys at a big disadvantage their engines are cheaper and easier to get bigger performance. But that's progress.
Mike
Mike
My LT1s flow better than 265 and I'm only a 190cc intake runner 2.00/1.56 valve.
LPE (a well known reputable shop) only advertises a 5 hp difference between their 350 LT1 and the LT4 package and 10 for the 383.
http://www.lingenfelter.com/pack_cor_c4_383.htm
I will admit that for a stock SBC the LT4 rocked, but it had a lot of little advantages over a stock LT1 (ie some of the supporting mods were done at the factory ... bigger lighter valves, roller rockers, higher compression......)
Now when it comes to mod ability the LSXs have us LTX guys at a big disadvantage their engines are cheaper and easier to get bigger performance. But that's progress.
Mike
Mike
Thread Starter
Staging Lane
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Originally Posted by titter
If your interested in taking a cruise across I-4 I know a few cars you might like to run ... all dig :] Nice run btw.
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Teching In
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Originally Posted by 346Vette
Ported LT4 heads or ported LT1 heads? If they are LT1, even ported, they probably won't flow as good. LT4's out flow LS1's by a good 20-30cfm. Its a completely different design and cast.
I disagree with that statement. Properly Ported LT1 heads will outflow stock LT4 casting all day long. And LS1 heads flow closer to 250-260 CFM at 0.500 lift. No way is a stock gen 2, 23 degree, 195cc casting heads will ouflow gen 3 15 degree, 205cc castings in stock form.
Originally Posted by Musclecar Evolution
I disagree with that statement. Properly Ported LT1 heads will outflow stock LT4 casting all day long. And LS1 heads flow closer to 250-260 CFM at 0.500 lift. No way is a stock gen 2, 23 degree, 195cc casting heads will ouflow gen 3 15 degree, 205cc castings in stock form.
Originally Posted by 346 Vette
but I like being sneaky. *Stock LT1, I swear*
BTW, your car is badass!
Thread Starter
Staging Lane
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Originally Posted by Musclecar Evolution
I disagree with that statement. Properly Ported LT1 heads will outflow stock LT4 casting all day long. And LS1 heads flow closer to 250-260 CFM at 0.500 lift. No way is a stock gen 2, 23 degree, 195cc casting heads will ouflow gen 3 15 degree, 205cc castings in stock form.
Thread Starter
Staging Lane
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Originally Posted by 572ysc
Well nice race and what I tell after over 40 years they still cant beat us GM prodcts!!! (hope itll never change)
Originally Posted by 346Vette
Now, wait. The GT500 could probably beat a stock 02 F-body... Probably.
Damn man your Vette looks really good, how many miles if you don't mind me asking? Can't go wrong with a red car, black with chrome lip rims and black tint.
Exact same scheme as mine even rims and tires haha, those are 17x11 in the rear right? 