327 ci lt1
Team Owner
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From: Park City Utah
Drifting
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From: Reno Nevada
The $DA2 LT1 definitions spark, and power enrichment run to 7500, and the VE runs to 7000 rpm. Stock is RPM limited to 5886. All of this could easily be modified. It will use it's last known table until it runs out of power.
Drifting
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From: Reno Nevada
Actually, the 350 was introduced as a SS performance option in 1967 Camaro's. Base car 327 was replaced mid year 69 with the 307 to be later replaced with the 305. Gen 3 did bring back the 5.3 as base engine. The 350 has always been an upgrade, or a performance option.
Race Director
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From: Slidell Louisiana
My LT1 is still making power at 7200 rpm and I'm on using a stock PCM with an Ed Wright tune. However, I don't see the benefit of decreasing the stroke on an LT1 at 7000 rpm all things being identical (heads, cam, bore, pistons etc) the 350 will be making more power than a 327, however, a 383 will make more power than my 355....
Now if we were talking GEN 1 with aftermarket block availability one could go big bore, but LT1 blocks are a limiting factor IRT bore.
Mike
Last edited by aboatguy; Mar 28, 2014 at 05:25 PM.
Thread Starter
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Most don't remember Grumpy Jenkins of the early 70's. He was winning almost everything he entered by over boring, and short stroking a 427. People can laugh all they want and build a goofy 383 (which does compliment the TPI intake) when you could use a 3.25 stroke crank in a 400 block and have a 348 that will clean the clock of most 350's? I ran one of these in a Vega as a kid and nothing 400 ci could come close with my Chet Herbert cammed 4000'stall converter.
On the other hand he left us with a wealth of knowledge. Yes, grumpy was stuffing spacer bearing in the 400 with the 327 large journal cranks and achioeve 352 cubes. or 354? idk. either way, destroking works. for us running really hot cams and a really high stall converter we can use the stroke advantage. also WOW this post grew fast! 
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GM's Nascar engine is 4.185 bore with a 3.25 stroke.
http://www.hotrod.com/techarticles/h...fications.html
The Corvette C6R bore is 4.09 with a 3.185 stroke
http://www.corvetteracing.com/2012-specifications.shtml
Short stroke with a big bore is what the big boys use people. Long stroke may sound cool at the bar on Friday night, but reality proves otherwise.
http://www.hotrod.com/techarticles/h...fications.html
The Corvette C6R bore is 4.09 with a 3.185 stroke
http://www.corvetteracing.com/2012-specifications.shtml
Short stroke with a big bore is what the big boys use people. Long stroke may sound cool at the bar on Friday night, but reality proves otherwise.
Team Owner
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From: Park City Utah
Thank you, there are SO many good points in this. a Ill gain fuel efficiency, I DRIVE my vette EVERY day. every day all day. I've built my share of strokers too. and while the low end torque is great I'm already dusting my tires off the line like a bat outta hell. If It was an f body trans am or camaro SURE Id stroke the hell out of it to compensate for the weight of the car, but this is a vette. I WANT TO KEEP THE LT BLOCK! THAT, is the point here. the reverse cooling the injection and roller valve train is what Im after. also the lt heads flow really good for a stock head especially with port work. The reduction of 23 cubic inches means i have 23 cubes more flow available per revolution to feed the fire. multiply that by 6000 rpms... I actually have an lt4 technically. the engine was replaced in 96 after just a year on the road with it im assuming they blew up the lt1 asap lol. I know they make these "rear main seal adapters" to adapt a gen 1 crank into an lt1 block. But I DONT trust this. I just dont. there's sooo many factors at play here though....
So you think you'll gain efficiency? AND hp?? And some how, GM missed that (after they had already produced the 327 before the 350)?
FYI, the Trans Ams weigh pretty close to what a Corvette weighs. Certainly w/in the C4/3rd gen' era. 3200-3400 lbs covers most optioned cars.
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Drifting
Joined: May 2013
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From: Reno Nevada
Thank you, there are SO many good points in this. a Ill gain fuel efficiency, I DRIVE my vette EVERY day. every day all day. I've built my share of strokers too. and while the low end torque is great I'm already dusting my tires off the line like a bat outta hell. If It was an f body trans am or camaro SURE Id stroke the hell out of it to compensate for the weight of the car, but this is a vette. I WANT TO KEEP THE LT BLOCK! THAT, is the point here. the reverse cooling the injection and roller valve train is what Im after. also the lt heads flow really good for a stock head especially with port work. The reduction of 23 cubic inches means i have 23 cubes more flow available per revolution to feed the fire. multiply that by 6000 rpms... I actually have an lt4 technically. the engine was replaced in 96 after just a year on the road with it im assuming they blew up the lt1 asap lol. I know they make these "rear main seal adapters" to adapt a gen 1 crank into an lt1 block. But I DONT trust this. I just dont. there's sooo many factors at play here though....
What's really funny in this thread is nobody even has considered the Ford guys. They've been using a short stroke for years and done quite well
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Yes. Ford and mopar both use short strokes. ALSOA HEY GUESS WHAT... there was never lt heads injection and roller cams when the 327 was around and even then there are many almost 400 hp 327's out there. Why cant i use the same bottom end with ghe better heads cooling roller cam and injection and get more hp. Im going to do this to prove its a power and efficiency gain.
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From: altered state
St. Jude Donor '05
Originally Posted by Kevova View Post
If a 327 could give equal performance and better economy.
If a 327 could give equal performance and better economy.
If youre doing it for fun than go for it why not just keep the 350 and say its a 327? Or put more stroke to it and do the same thing they all look the same.
Had fun with some 327s yrs ago but you couldnt pay me to put one in a car today they are just too small
Theres a myth that longer stroke engines cant rev or make power upstairs wrongo!
Drifting
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From: Reno Nevada
Not saying long stroke doesn't work, but that real racing is not using it.
Team Owner
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From: altered state
St. Jude Donor '05
True but were not running at 9500 rpm for hours
Capt colt it takes a good bit to get a 327 to a true 400hp. Youll need a good head and a healthy cam to get there
One of the most dissapointing cars Ive even driven was a 69 Z/28. Short stroke, that car was an absolute pig even above 4k everything was new ,heads ported tuned perfectly. So it can rev.... At least it sounded good
Capt colt it takes a good bit to get a 327 to a true 400hp. Youll need a good head and a healthy cam to get there
One of the most dissapointing cars Ive even driven was a 69 Z/28. Short stroke, that car was an absolute pig even above 4k everything was new ,heads ported tuned perfectly. So it can rev.... At least it sounded good
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From: Park City Utah
Drifting
Joined: May 2013
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From: Reno Nevada
True but were not running at 9500 rpm for hours
Capt colt it takes a good bit to get a 327 to a true 400hp. Youll need a good head and a healthy cam to get there
One of the most dissapointing cars Ive even driven was a 69 Z/28. Short stroke, that car was an absolute pig even above 4k everything was new ,heads ported tuned perfectly. So it can rev.... At least it sounded good
Capt colt it takes a good bit to get a 327 to a true 400hp. Youll need a good head and a healthy cam to get there
One of the most dissapointing cars Ive even driven was a 69 Z/28. Short stroke, that car was an absolute pig even above 4k everything was new ,heads ported tuned perfectly. So it can rev.... At least it sounded good
Melting Slicks
Joined: Apr 2007
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I wonder if I could bore my SBC to 5 inches and run a 2 inch stroke......maybe that way I could drop the cubes down to roughly 200 but it would rev to 15000 RPM .......wonder why I never thought of that......
BTW; Ford's modular motors (the 4.6 litre) are not over squared, the actually have a longer stroke than bore and are very efficient with the SVT dual overhead cam, supercharged version.....my brother has an 03 Cobra that unfortunately I know a little too well.....
BTW; Ford's modular motors (the 4.6 litre) are not over squared, the actually have a longer stroke than bore and are very efficient with the SVT dual overhead cam, supercharged version.....my brother has an 03 Cobra that unfortunately I know a little too well.....
Last edited by 856SPEED; Mar 29, 2014 at 08:05 AM.
Melting Slicks
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