xs-sxs

So I picked up a 94 camaro that had a spun rod bering. I have torn it out and down the crank was turned 10 and 10 under. I have arps for the stock rods and want pistons with a higher cr so I was going to go with a 1.56 comp height at least as light as the stock peices (around 530g with pin? without rings?) produce around 450 hp spinning around 6800 rpms a larger cam like Comp cams #07-467-8 280XFI HR13
Duration IN 280 ex 288
Duration @.050; in 230 ex 236
Lift in .576 ex.570
LSA 113°
for pistons I wanted these
Keith Black KB Performance Pistons
Summit Racing Part Number UEM-KB106-020
Piston weight 535g, pin weight 145g
or these
Speed pro forged L2256F
Weight Without Pin (g) 490
Wrist Pin Weight (g) 118
I am doing the porting my self on the heads and intake (I have done it befor on sbc's but not lt1's) And i can use info on cc ing them. I dont want to touch the combustion chambers unless they are really out of wack but I'll test for that I aming for still using street gas and i know the lt1 can handle more cr than others espicially with a big cam I read the DCR article and down loaded the the calculator which I'm tring to figure out my future specs. (I did not measure on the tear down), I know I'll need different springs and lighter valve train to handle the rpms.
Thanks in advance for the expertise.

RamAir95TA

iTrader: (2)

For only 450fwhp (assuming that's what you're looking for), a good stock-type rebuild is all you need since you don't need tons of RPM to get there.

fuzzyjk

iTrader: (4)

Are you looking to add juice or boost any time in the future?

xs-sxs

But... ya never know for sure. I know it would take a complete different strategy for boost and forged pistons for NO2 so I am just thinkin NA for now, I mainly need to figure out the right cam and compression (pistons) and DCR for what I want to do...

RamAir95TA

iTrader: (2)

You don't determine your compression by the pistons alone. There's several other things that determine that. I asked if you were looking for 450whp or 450fwhp...clarify just which one you're after.

xs-sxs

Not really familiar with the term fwhp (free wheel hp?) but Imean rear wheel hp than yeah I want to build that or more 450+ rwhp would be great mostly limited by budget. Is fwhp a reference to crank hp? Googled it and got the drivetrain power loss but do you mean by percentage or a constant 30 or so hp? Like I said I'd like to see 450+ rwhp after the drivetrain losses. Feel free to explain what you mean I'm here to learn. BTW I do relize that these hp#s are probably out of my budget but I'm gonna try to do the best i can...

xs-sxs

Im getting about 11.09-1 static and 8.86-1 DCR on 107*? intake center line. I'm new to lt1 tuning but that seems safe for street octane fuel, right?? Also I'm not sure about where the cam is degreed to. Can i push the compression up some more? Does anyone run this cam with good results?

mcalus

iTrader: (14)

Fwhp= flywheel horse power.

RamAir95TA

iTrader: (2)

Your goals are extremely unrealistic. Maybe take a look at what it takes to get that kind of power at the wheels and then devise a new plan. Home-ported heads, low compression, and an off-the-shelf cam just won't cut it.

fuzzyjk

iTrader: (4)

These engines in stock form put down 230hp to the wheels. A decent sized cam with AI or LE stage 2 heads will get you on or around 400whp with all bolt ons factored. Rule of thumb is 15DL loss for manual and as much as 20DL with auto. 450whp is 540 crank, deep deep pockets will be needed if you are not interested in running spray or a lower end priced snail. Decide what you want for power goals the design the engine around those goals. Compression for juice, reduced pressured for boost. 450hp is an extreamly stout goal for N/A.

slomarao

iTrader: (6)

x2x


OP, get a better cam if possible. a custom cut AI/LE would be lots better, power wise, mpg's, driveability, etc


Than bump up the compression a bit. you should make way more power than, and the car will be a lot better to drive.

xs-sxs

Suggestions for the cam specs? I'm gonna have to aim for 12to1 or more? I think that it is easier to lighten the pistons and rods and drive train, rev it higher for higher rpm power. My thoughts any way. I have read on here about someone runnin 13 to 1 on pump gas. I just don't really know my self. I'll google and figure any thing out from what I read I just have to know that it is accurate and I am on the right direction. So any way any suggestions would help.

TravisMcGill2000

iTrader: (2)

Id shoot for 11.5 to 12.1 compression. Far as cam goes like said call le or ai. Also with your hp goals. Id would set more like 380ish

TravisMcGill2000

iTrader: (2)

Make sure you get lt's full exhaust, cai, gear, and stall if auto. The victor reinz .026 head gasket will help out with your compression.

slomarao

iTrader: (6)

im 11.8.1 comp, cam is a 226/234 565/565 111 lsa. runs/drives close to stock. Ion did my tune, and have yet to put it on a dyno.

LE custom stick.

Id look into something similar. AI/LE customs are the way to go, both guys are very proven and know LT1's.

there are some decent comp off the shelf grinds but why not pick out everything you want/need, rather than picking the best match from the shelf cams??

xs-sxs

I like the suggestions I'm getting and appreciate the input, I'll be looking at the AI/LE cams n stuff. Thanks for the expertise... I'll be lookin at the CAI and headers once it is built and I have a 58mm TB and 30# injectors not sure that I have to have them but I got them. I am very interested in what I'll have to do to the stock auto tranny for it to hold up(and how much it'll cost) I have been looking at the dyno archives to figure out what to do, still not sure yet.

xs-sxs

checked a combustion chamber in my head it is 53-54cc, I think that they have been milled before. Got .030 over hyperutetic pistons with a 1.565 Comp height and ARP rod bolts. The saga continues.

RamAir95TA

iTrader: (2)

Not that there's anything wrong with hypereutectic pistons, but why not go forged? What did you end up using for cylinder heads/cam selection?

lt1needingboost

iTrader: (8)

so im reading this and im wondering 450 rwhp out of a 355 but no money in heads i guess i dont understand i c the budget thing but it snds like a lot of money spent in the btm end?

lt1needingboost

iTrader: (8)

maybe its a stick that will help a lil bit on getting 2 450 rwhp cam and head combo shld get him close 425, 430, 450 tho maybe if its a stick .