Ccreddell
06-20-2016, 10:50 AM
OK, I screwed up when I rebuilt the top end of my 5.7 a year or so ago, and after swapping on the higher compression Vortec heads (http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dautomotive&field-keywords=vortec%2Bheads), I also switched over to Mobil 1 synthetic oil (http://www.amazon.com/gp/search?ie=UTF8&camp=1789&creative=9325&index=automotive&keywords=mobil%2B1%2Bsynthetic%2Boil&linkCode=ur2). Ive since been told this is a no no. At least Im doing my part for mosquito abatement..... Anyway, it has caused me to start thinking about what to do with my motor-rebuild it, or replace it. So, I have a 94 LT1 with aluminum heads, that has been sitting at the machine shop for a while waiting for me to give the green light. After a bunch of research, I came up with an idea. Thought I'd run it by you guys to see if I missed anything.
So, my LT1 will be .040 over, and Im going to run the Lunati LT4 hot cam. Specs are 218/228 at .050 with .503 lift with 1.5 rockers. I'll be running 1.6s for .5635 of lift. I was originally going to run a TPI setup, but it would require running a 411 ECM and I have too much money at the moment in an EBL setup that I have the tuning software for already. I got to looking at the dual plane 4V intake from GM performance, and with a carburetor, it pulls 30 ft.lbs. over a stock LT1 setup. As I am already running a 4V manifold with adapter under my TBI, the thought occurred to me that the LT1 dual plane with a TBI could work out real well. Not only does it have the low end grunt of a TPI, but also breathes well into the 5800 RPM range-unlike the TPI. The cam is also good from 18-5800 RPM so that looked like a good fit too. This manifold will also let me run the stock distributor getting rid of the Opti-crap and send the proper signals to my ECM. The 10.5:1 compression with keep the efficiency up too and I should get just as good or better mileage than I do now.
I put the numbers into my desktop dyno-including complete flow numbers for the LT1 heads and 490 CFM for the TBI. At the rear wheels its showing 416 ft.lbs. at 3000 and 337 hp at 4750. If I replace the TBI with a 454 unit, at the rear wheels, I get 426ft,lbs. at 3000 and 346hp at 4750. Looks like the throttle body (http://rover.ebay.com/rover/13/0/19/DealFrame/DealFrame.cmp?bm=293&BEFID=96477&acode=312&code=312&aon=&crawler_id=482306&dealId=H6Yuq-aWiZpNn5yJWyVu7g%3D%3D&searchID=&url=http%3A%2F%2Fwww.americanmuscle.com%2Fairaid-tb-spacer-2011v6.html%3Futm_content%3Dairaid-tb-spacer-2011v6%26utm_campaign%3DShoppingMusOnlyV1%26utm_so urce%3DShopping_com%26utm_medium%3DShopping%26AMID %3Dairaid-tb-spacer-2011v6-MusOnly&DealName=Ford%20Mustang%20Airaid%20450-636%20Poweraid%20Throttle%20Body%20Spacer&MerchantID=482306&HasLink=yes&category=0&AR=-1&NG=1&GR=1&ND=1&PN=1&RR=-1&ST=&MN=msnFeed&FPT=SDCF&NDS=1&NMS=1&NDP=1&MRS=&PD=0&brnId=2455&lnkId=8070676&Issdt=160619051540&IsFtr=0&IsSmart=0&dlprc=132.5&SKU=SMairaid-tb-spacer-2011v6-MusOnly) will naturally limit over rev.
Any thoughts?
So, my LT1 will be .040 over, and Im going to run the Lunati LT4 hot cam. Specs are 218/228 at .050 with .503 lift with 1.5 rockers. I'll be running 1.6s for .5635 of lift. I was originally going to run a TPI setup, but it would require running a 411 ECM and I have too much money at the moment in an EBL setup that I have the tuning software for already. I got to looking at the dual plane 4V intake from GM performance, and with a carburetor, it pulls 30 ft.lbs. over a stock LT1 setup. As I am already running a 4V manifold with adapter under my TBI, the thought occurred to me that the LT1 dual plane with a TBI could work out real well. Not only does it have the low end grunt of a TPI, but also breathes well into the 5800 RPM range-unlike the TPI. The cam is also good from 18-5800 RPM so that looked like a good fit too. This manifold will also let me run the stock distributor getting rid of the Opti-crap and send the proper signals to my ECM. The 10.5:1 compression with keep the efficiency up too and I should get just as good or better mileage than I do now.
I put the numbers into my desktop dyno-including complete flow numbers for the LT1 heads and 490 CFM for the TBI. At the rear wheels its showing 416 ft.lbs. at 3000 and 337 hp at 4750. If I replace the TBI with a 454 unit, at the rear wheels, I get 426ft,lbs. at 3000 and 346hp at 4750. Looks like the throttle body (http://rover.ebay.com/rover/13/0/19/DealFrame/DealFrame.cmp?bm=293&BEFID=96477&acode=312&code=312&aon=&crawler_id=482306&dealId=H6Yuq-aWiZpNn5yJWyVu7g%3D%3D&searchID=&url=http%3A%2F%2Fwww.americanmuscle.com%2Fairaid-tb-spacer-2011v6.html%3Futm_content%3Dairaid-tb-spacer-2011v6%26utm_campaign%3DShoppingMusOnlyV1%26utm_so urce%3DShopping_com%26utm_medium%3DShopping%26AMID %3Dairaid-tb-spacer-2011v6-MusOnly&DealName=Ford%20Mustang%20Airaid%20450-636%20Poweraid%20Throttle%20Body%20Spacer&MerchantID=482306&HasLink=yes&category=0&AR=-1&NG=1&GR=1&ND=1&PN=1&RR=-1&ST=&MN=msnFeed&FPT=SDCF&NDS=1&NMS=1&NDP=1&MRS=&PD=0&brnId=2455&lnkId=8070676&Issdt=160619051540&IsFtr=0&IsSmart=0&dlprc=132.5&SKU=SMairaid-tb-spacer-2011v6-MusOnly) will naturally limit over rev.
Any thoughts?