derekderek

iTrader: (21)

Need some help with choosing new pistons for my build. I am looking at a really good deal on some CNC ported TFS Heads 200cc. They flow 294cfm intake and 252cfm Exhaust @ .600" lift and have a 62cc chamber. I know that will lower my CR quite a bit so I need help with a good piston that will raise compression back up. It is drag only car looking to run mid 10's so a higher compression than stock is fine I don't mind running race gas if it will help meet my goals.

Current build looks like 355 rebuild stock crank H beam rods with The heads mentioned above ported intake and custom cam. Of course with all the expected supporting bolt ons. So through me some ideas on so good pistons thanks for the help.

94LTZ

iTrader: (5)

I've been looking into a 355 build also but it ended after i sold my block to you.. I hope it works for you.. what kinda mains you going to run??

Corey @ Clayton Racing

For your application MAHLE has a great selection of Shelf pistons that are very lighweight. I'd look at running a long rod to get an even lighter piston. we like to run 6.125-6.250 in our race 355's

derekderek

iTrader: (21)

What kind of compression should I run? I know on my 454 I am running around 16:1 would I benefit any from a big bump like that on a LT1?

derekderek

iTrader: (21)

Looking at running some 4bolt mains right now. I am looking for something pretty stout that will take a beating at the track. All of my family only run BBC's and keep trying to get me to convert it over to one saying I will never run fast times with the LT1. So just trying to prove them wrong lol. Also have to do this with no power adders so I am weighing choice of going 383 for the extra displacment you know. I think with a solid built engine shouldnt be to much of a problem.


How is you and your bothers car coming along. Finished with his yet? That thing should be pretty stout when its done. Hoping to take my new setup to the track this friday or next for sure. Looking to break into the 11's with any luck. Hopefully theres some good weather.

Corey @ Clayton Racing

355 with 11cc dome and 62cc's puts you just over 13/1. 383 with 11cc dome puts you at 14.5. and it would be an easy to get shelf piston. The 355 piston for 6.125 rod would weigh 440 grams, the 383 piston also for 6.125 rod would weigh 415 grams. Either way I would step up to run a forged crank and use a 2" rod journal.

derekderek

iTrader: (21)

Wow thanks for the info! Do you happen to carry any of these choices in stock? If so can you PM me some prices on some rods/pistons for 355/383 setup? Thanks again.

Corey @ Clayton Racing

Yep I stock most of them, I'll get some prices and options over to you today.

94LTZ

iTrader: (5)

Stuff with that car has come to a stop on my end do to some things we didn't agree on..It's now at a shop that knows nothing about LT engines, should be interesting..

derekderek

iTrader: (21)

LOL sounds like alot of money is going to get wasted. Well that sucks it sounded like it was going to be a pretty stout setup. Has he tried out the M6 yet or is it been down this whole time? What shop did he take it to if you dont mind me asking?

94LTZ

iTrader: (5)

The car has been down the entire time so luck on using it.. He took it to a shop called automotive past times lol.. They are ok with old school stuff but nothing like this, hell they are asking me ?'s about it lol, bad sign...But not my car..

Wicked94Z

iTrader: (26)

how would the same piston on a 383 raise the compression 1.5 points? im running custom JEs with my 64cc afrs for 12.5 compression. i thought i would get away with it on pump gas but apparently the crappy CA 91 octane wont handle 9.1 dcr so im running 100 unleaded.

Corey @ Clayton Racing

I'm sorry your right the exact math using 62cc chamber is 13.3 or 14.24 using 0 deck 11cc dome 4.040 gasket bore .039 thickness.
If you run .035 gasket your at 14.4 with the 383.

Colin91Z

iTrader: (9)

Because when you add cubic inches, you're adding more volume, which in turn makes the compression ratio higher.