Hi there guys,

I would like to do an engine swap for my 98 Z28. I found a used 383 Lunati stroker kit for a quite reasoanable price. The problem is one of the pistons has cracked the sleeve so it is unusable (I don't care about the block as I will not buy it). The rest of the pistons are OK with minor scratches and the connecting rods and the crankshaft are in great shape. On the other hand, the same guy has a cheaTR+AFR 205 heads package in hand. I will have to change the valves as well because of the failed piston. The heads are OK though. Both the rotating assembly and the heads-cam are used in a Vortech supercharged Vette, whose supercharger is also on sale.

When I build the engine, I would like to apply a big turbo like an S91 or equivalent.

I got 4 questions for you...

1) Do you think I might just get away with buying just one piston from Thunder Racing and use it with the other pistons? Or should I get a set of 8 for sure?? What else do you think I should change from used parts (valve springs, engine bearings etc.)?

2) I am thinking about getting an LS2 6.0l iron block for long durability and put this stroker kit in and the heads and cam package with it, do you think this combination will be good to reach around 900-1000rwhp with an S91 and good tuning and what CR should the engine have?

3) I have 2 camshafts in hand, a CheaTR 214/230 .601/.575 117 LSA and Compcams 216 / 220 .525 / .532 114 LSA. Which one do you think will be appropriate for me to achieve my goals or would I need a new cam for this??

4) Instead of building a turbo setup, should I just buy the supercharger kit as well from the Vette guy (for cheap) and spray some juice on it to reach my goals??

I am about to decide on what to do and do not want to do something wrong, so thanks for your input in advance

 

Anyone????

 

1)i would get a full set of 8 pistons to begin with so they are all the same with the same wear on them, and about the other used parts are u planning on using your shortblock currently or like in #2 are u getting a ls2 block, if u get ls2 block just get a short block and it will have those other parts except for valve springs of course.
2)yes that combo should put u right at the number, i would shoot for 8.5-9to 1 compression.
3) those are pretty small for a camshaft for a stroker or 402 but either one could work but not ideal.
4) what head unit for supercharger?depends on what your budget is i guess

 

I cant answer all your questions but from my experience.

I will never buy used performance parts that are critical to the engine Ie internals. thats just my opinion though had a bad experience with buying used stuff. So if u could afford it id go with a whole new rotating assembly.

 

LOL, nice sig man! LOL

 

Thanks for the input guys Actually, at the moment I can not get a brand new rotating assembly as it exceeds my budget. My first aim was to turbocharge my engine with stock bottom end and stock heads but with high quality forged pistons, and keep the boost low till I build an engine with forged internals. Afterwards I found this deal for forged lunati crankshaft, pro billet rods, AFR heads and camshaft package.

On the other hand the supercharger from the Vette turned out to be a P1SC1 Procharger. It looks OK, but I would consider if it was a D1SC for my HP goals...

So I think what I will do now is this. I will get a brand new GM LS2 iron block core, get new custom pistons (Diamond I suppose) for high boost, ARP studs, new bearings, gaskets, lifters and double valve springs. Build my motor with the parts above and Lunati stroker parts, use the AFR 205 heads and cheaTR cam and try to hit around 1000rwhp with around 8.5-9CR. (On the other hand I have wet nitrous kit on the car with timing tuner and hardware.) I will also need to buy bosch 455lph fuel pump instead of my 255lph walbro I have now and good injectors, by the looks of it.

Do you guys think AFR 205 heads will be fine or will I be able to have it converted to AFR 225 heads on a CNC table or something??

Do you think I will need anything else for this combo to build up the motor?? I want to buy eveything at once to reduce the shipment cost all the way to Turkey

Thanks again for the help

 

i dont know if anyone making 1000rwhp is using the afr205's but i will be trying with those heads also. it wouldnt be worth the money to have all that work done to the heads , u could sell your 205's and buy the 225's

 

You'll need two of either fuel pump you stated at that power level. One bosch 044 pump won't get you there.

 

Thanks a lot guys, my mind is clearer now thanks to your replies. I will check other threads about fuel, injection, timing, methanol etc to gather some more information for my build

 

Used internals + High compression + Huge Turbo + Insufficient fueling =

I would say save up and wait if your going to be doing a build like the one suggested as you dont want to throw away money on a cheap setup that wont last/work.

 

I agree, I have been peicing together my build since last summer and will most likely be a year frmo than till its fired. Do it once and do it right! Build a full entire build that is solid just not in certain areas. Atlest the power adder system, fuel system and powertrain. Drivetrain can wait 'IF' you ahve to but don't expect it to last long. Good Luck!

 

I get your point guys. The only used parts will be lunati crank, lunati pro billet rods and AFR heads which are only used for around 3000 miles. I suppose the rods and crank are better and stronger than most of brand new other forged parts in the market. I will get a brand new 6.0l LS2 iron block core and custom pistons, adjust CR to 8.5-9 with new pistons. I will use methanol to run the boost safely. I will now concentrate on fuel system. I suppose I wil use Aeromotive pumps and fuel regulator with new lines if necessary, still searching on it. I also need a strong clutch. My T56 is a D&D performance reinforced one, so I don't think I will have problems with that.

 

I say as long as the parts are thoroughly inspected, there's no problem using them. I would be more concerned about running out of funds on a budget. FI is pretty damn expensive from what I have seen here.

 

In saying that the only used parts I am using is the foged rods with about 3000 k but not worried about it, came out of a pefectely running motor from a guy I know. Othe than that, new diamond pistons, new callies dragonslayer crank, etc. Can't wait for the 370 to come alive!

 

I hope you reach your goals soon too