What will it make ? 355 h/c

[Swiggart]

I am building a 355 lt1. It has 28lb injectors, hand ported heads with a 3-angle valve job and good valve springs. Gasket matched intake, 11.2:1 compression, 280 xe cam ( 230/236 and 544/554 @/060 110 or 112 lsa), 1.6 rr, good i beam rods, strong steel crank, silvo-lite cast flat top pistons and about every bolt on there is. It is through a 4l60e with shift kit and 2800 stall. What should i expect hp wise? Does anyone have a bin they could send me to get me on the right track for a tune? Should i go with 110 or 112 lsa? What times should i expect with 4.10 gears in a 2600lb car? Any other input or advice is appreciated.

[ZOHAN]

Going to end up using the block you pulled out? Does it need to be bored .030? You'll prob only gain like 5hp from it, so not exactly worth it for machining cost. I know someone that can tune it locally, I'd have to confirm price. Maybe pull around 350-375whp? Maybe others will disagree, I'm guessing going off cam size. Should def move only weighing 2600lbs though. If the rear will hold up to a launch with traction is what I'd be considered about.

Making you silky smooth...

[Swiggart]

Cant salvage the block so getting a .030 one this weekend and then going to town spending money. Lol, how much to tune ? I dont need it spot on just the obvious stuff so I can fine tune it with tunerpro rt.

[Swiggart]

I am just curious what others think I could pull off for an et, I am unsure about the rear end holding but if it doesnt then its time to fab up something better!

[JCzNova]

I will go with a 11.9-12.20 in a decent DA, depending on traction, tune and driver mod.

[Swiggart]

Jcznova, what cam lsa should I get ? I cant figure out the real dofference other than sound and about a 150 rpm shift difference. Is that it?

[95grnformula]

had almost the same build except for the cam mine was a .230/.236 on a 110 but never made it to the dyno pulled hard. my advice to you dont use the silvolite pistons. mine made it about 1500 miles before one of them gave out on a hard launch shot the rod out the pan :cry::cry:. from the fragments i pulled out looks like the piston came appart at the wrist pin. when it went i had two explosions first my guess was the piston breaking hears rod knocking against block but was turning around 6k when it went then i heard it take out the rod and lots of smoke out the back. I installed everything to silvolite specs tripple checked everything because of all the bad reviews about blowing the tops off it the rings were too tight and still broke it. oh well i guess i have no choice than to build the forged 383 stroker i wanted to originally build :finger: "honey hand me the credit card"

[JCzNova]

Jcznova, what cam lsa should I get ? I cant figure out the real dofference other than sound and about a 150 rpm shift difference. Is that it?

With a mild build I don't see you being able to notice much of a difference, other than sound like you said, and MAYBE minor streetability loping around town.

Seems like the majority of builds I have seen have gone with the 110.

[JCzNova]

If you still have the factory crank, it is forged and I would run that. Then if you think about a little spray down the road you're already set.

Maybe someone with a similar build could tell you what the duty cycle would be on those 28lb'ers too.

[Swiggart]

The crank is forged, I dont have much of a choice. What would be a better piston for cheap? I already had the silvo lites so I figured id put them to use.

[Swiggart]

What octane gas were you running and what compression ?

[95grnformula]

What octane gas were you running and what compression ?

11.5:1 give or take car never saw anything other than 93 octane from QT was tuned and like i said ran fine the first 1500/1900 miles lost count with no problems untill it decided to go after it happend was talkig to a guy i work with that has a 5.0 fox and he told me he blew the top off of two silvolites in two diffrent ocasions but he was lucky all he had to do was replace the pistons no other damage.

[JCzNova]

The crank is forged, I dont have much of a choice. What would be a better piston for cheap? I already had the silvo lites so I figured id put them to use.

Just checking since it read steel crank in the first post. I am sticking with the stock crank until it breaks. Lol.

[BADMOON]

In a 2600 lb car ? thing should be low 11's

[Swiggart]

Hopefully i will have it out sometime in the next couple of weeks after i get my new computer and get the base tune down. Hopefully I can hookup and get a decent 60 ft.

[bufmatmuslepants]

If you still have the factory crank, it is forged and I would run that. Then if you think about a little spray down the road you're already set.

Maybe someone with a similar build could tell you what the duty cycle would be on those 28lb'ers too.

Stock crank is NOT forged, it is cast, but GM cast has proven reliable over 700rwhp.

Using cast pistons and a forged crank is backasswards, get forged pistons and reuse the stock crank.

[Swiggart]

I would rather use a forged crank i already had with the pistons i also already have then drop 700 into stuff that i already have sitting. I'm not going boost anytime soon and these pistons are proven in carbed sbc's to withstand high compression and high rpm's. Alot of dirt track cars have these same pistons.

[Swiggart]

What do you guys think this cam with a good port and polish with a stroker crank & everything else being the same? How much is there to be gained on my set up by going 383?

[MoeHorsePower]

The big question is the hand porting of the heads, this can make or break horsepower, who ported them? Good porting will gain you HP, Poor porting, you will loose a lot of HP..

[Swiggart]

I will be porting them, i have had success with porting heads previously so i should be able to get them to flow well enough to feed whatever cam i choose. I ran this engine to 6700 with no issues and it waas still pulling HARD.