If you have 255’s, burn them up.. learn Racecraft. Seat time... seat time... seat time...
Marshall Mosty
AI/SI Texas Regional Director
2011 NASA-TX American Iron Champ
AI #67 "Mosty Brothers' Racing" (RIP)
ST6 #21 Toyota Corolla (being revived)...
We have 3 third gens in our region running carbed 350s. They all make good numbers and are stupid simple. The 350 with a LT1 T56 makes a pretty solid setup. Bryan White has been running this setup for several years and it has been very reliable. The downside is that some are actually on the high side of torque so you have to be careful of your exhaust configuration so as not to build too much torque. The other downside they are iron head iron block. Still waiting for someone to submit a RCR to allow the 80s corvette aluminum heads.
Bob
Bob Denton
CMC #67
Great Lakes Region
Hey, Thanks for chiming in. Been told you have good experience with them. The 305 TPI I got is fresh, so I'll probably keep it in the car as long as it is healthy. But, possibly in the distant future, I'll roll with the carb'd spec engine. I like EFI, but I enjoy simplicity too. Thanks for the info.
Which intake are you running? If I recall, the 305 runs out of air at about 4500-5000 RPM.
You might talk to Sean (Storm Trooper #15) about his experience with his 3rd Gen.
Sean did the 5.3 LS conversion on his car last year. Big change was that the LS uses about
1/2 to 2/3rds the fuel as the 305 and the torque is better across the RPM range.
Trying to recall if he changed diff gears too, he can tell you.
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Laissez les bons temps rouler
A couple months late on this answer, but as far as the intake, its the Vortec to TPI intake thats on the car now. I've been looking at the 5.3 LS engines out there. Trying to figure out how much going the LS conversion route costs in total. T56s are not cheap, and I'd have to buy all the LS1 accessories, intake, and exhaust manifolds per the rules.
I have a spare Vortec 350. I think I am going to build it per the spec carb rulebook, and then maybe use it in another non-daily driver project and dyno tune it (more emphasis on the tuning than hp/tq numbers). But then, if my 305 starts to have troubles, I can just pull that Vortec as my backup engine since it'll be spec. Thats the thought right now anyways. I just wish the spec engines could run roller cams since thats what I already have.
Sean's 3rd gen still runs (ran?) a T5 at least as far as Hallett.
RM CMC Director
Talk to Sean, he can tell you costs. And probably give you some ideas on
where to get stuff on a tight budget. I think he actually used the truck block
(LM4?) and accessories brackets because they are readily available at
the pick-a-part yards. And they make more power than you can use.
He runs a tail pipe restrictor to get the HP/TQ numbers down to avoid
penalty weight.
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I found this $800 for turn key with accessories, harness, ect. Would need accessories, intake, and exhaust from LS1. So maybe $1250 for all of it. Then getting the trans to bolt up probably needs a bellhousing and crossmember. Yea. Ill definitely get with someone who has done this before. My career in HPDE pre CMC license, will definitely be running the 305 vortec TPI. As long as it lasts, im gonna run it.
https://dallas.craigslist.org/ftw/pt...791509649.html
Looking at the spec carb route, the intake, carb, cam, ect is gonna be over $1000 and that doesnt even include the rebuild. But the engine would be fresh vs 150,000 miles on the 5.3 LS.
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