I'm new to the LT1 area and have a question about the motor. Are the heads the same on the LT1 as they are on the earlier 350's?

 

No.

 

......x2

 

whats the diff?

 

LT1 heads use reverse flow cooling (the water pump cools the heads first, then the block, allowing for greater compression), so the coolant passages are entirely different. We use a dry intake manifold, so coolant never gets to the intake manifold.

 

Thanks trying not to sound dumb, just new to FI. Built a lot of drag cars but all old school. So how much comp. does a LT1 have stock? And how much can you safely run with 93-94 octane? Looking @ some Howards forged pistons and they said it produces 10.5:1 comp with 64cc heads so I was figuring around a little over 11.1 comp with the stock 54cc heads.

 

Should have no problem with this set up. You can even go higher to 12:1

 

WOW you can go that high with pump gas and still drive it on the street! Man guess it does make a diff with cooling the heads first.

 

You can go even higher. Many guys (including myself) are closer to 13:1 on pump gas and I drive it all the time. As long as your cooling system is up to snuff and you have a good tune, you'll be fine. LT1s come from the factory with 10.5:1 static. Keep in mind static compression is just a solid figure on the build dimensions of the engine and has no bearing on performance - it's the dynamic compression ratio that's more important.

Are you planning a build? Redoing the bottom end? Are you leaving the valvetrain stock? What's the deal?

 

D Port exhaust ports too, among a few other small differences.

 

yeah looking at picking up another motor from a friend of mine. Plan on using a steel crank, h beam rods, ported heads and intake, forged pistons and a Voodoo cam the spec's are as follows dur @.50 243/251 lift .560/.565 LS 110. Not sure 100% on the cam, might go with a soild roller. 4.10 gears and a 6 puck ceramic clutch. Not sure on TB size or INJ size have to find out what to use. Trying to get around 450-500hp. NO POWER ADDERS.

 

What are you shooting for as far as displacement is concerned? 355, 383, 396? For 450-500hp (assuming crank HP), you won't need h-beams as I-beams will be more than enough and save yourself some money. Additionally, a SR valvetrain will likely be overkill as well.

You need some direction! Read up on other people's combos and see what they're using instead of throwing a modge-podge of parts together and hoping for the best.

 

Was looking at staying a 355 cid. no more than a 383 at the most.

 

Well pick one...hahah. There is a different method to each choice.

 

355