What would you build? (5.2 capacity limited)

[KustomCandy]

B: 4.100"
S: 3.00"
R: 6.125"
Comp 16.5:1
14deg heads
Injectd on Meth
9,200rpm redline

^------ That would be about the top of the list.

On a more frendly budget, I would build a 4.8L GM LSX engine out of the scrap yard. Use a L92 head or a LS7 head with smaller valves and a nice Mike Jones Solid Roller with as much CR as your fuel will tolerate (AV or Meth.).


Cole

Cam King was right, It was only a theretical Q:
I used to watch a Bit of Boat racing as a kid. I've always been a huge fan for any thing petrol driven, Cars and dirt bikes being on top of the list. But as of the last few weeks, I had an uncanny reminder of these boats. So now that I'm older, I'm thinking "well?"

To be honest, I had to go research these 4.8s. We don't get a lot of the U.S cars trucks down here as a rule (other then F-trucks, silverados/suburbans....Used for hauling Drag cars or horse floats). My knowledge of the LS is only from our own HOLDEN 5.7ltr. Coming from the old school, Plastic bumper bared cars dont interest me, So I've missed the boat on these new Gen's. Guys do play with them, Most are Hair dryer driven, or Head/cam/ tuned as every day streeters.

How serious are the guys playing the field? If its like the drag racing; A lot of stuff will be pre-built Imports. I'm not of the cheque book racer personally. prefur to build it myself. If you can stay with the pack, ya got some thing to smile about

I have a Q: tho. What advantages, would you have using the 4.8 over 5.7 block, eliminating the shrouding issue?

Dan

[sjvalleydave]

Hey rce4csh, when your talking about the Kings River, do you mean the old Riverland resort right there at the Hiway 99 bridge and the River?

[colebalster]

I have a Q: tho. What advantages, would you have using the 4.8 over 5.7 block, eliminating the shrouding issue?

Dan

You had stated a 5.2L limit, so the 5.7 would be too big already, unless you were to put a shorter stroke in it to bring the CID down. The 4.8L (3.78" bore x 3.23" stroke) with a 5.7L crank (3.62" stroke) is a 5.3L, still too big though. Custom parts would be necessary if you wanted to get close to the MAX displacement allowed. In that case of using custom parts, I would use the largest bore possible that your budget would allow (LS3 4.060" bore or LS7 4.125" bore), and adjust the stroke accordingly.


Cole

[rce4csh]

Yes sir! We would typically put in at Riverland if they weren't too busy and proceed up river a bit. Riverland itself was in full view of Highway 99 so too much hot rodding around the island there would earn ya ticket form the CHP of all people. Learned real quick that was not the place to throttle up too much. Up river about 3 or 4 klics was a section we called "The Islands!" Basically some sandy beach kind of places where you could hang out with your friends and your coolers and nobody but the Kern County Sheriff patrol boat could get to you. There were a couple of straighter sections farther up river when the water level was higher that the "Flats" would flex their muscles on. Much like street racing but with more bikni clad sweeties around. Good times for sure!

[Rizzle]

I have a Q: tho. What advantages, would you have using the 4.8 over 5.7 block, eliminating the shrouding issue?

Dan

Nothing but already having the block, maybe rules if they require iron block? The ls1/ls6 block with the 4.8 crank would definitely weigh less. You really only use the 4.8 rods/crank, since gm used the same comp height for the bread and butter gen III/IV engines. The crank and rods fro mthe 4.8 are easy to source, even the newer floating ones, separate of the engine, so all you'd have to do is put that combo in a 3.9" bore block.

This is similar to the early CTS-V racing engine, I think they 4.8 cranked an ls7 (C5R probably?) block to meet CID requirements. Where the cts-v lifters came into existence for the high rpm the engine saw.

Yeroon

[autodoctor911]

for 5.2L out of an LS motor you need to bore tha ls1 or ls6 block to 3.93" and throw in a 4.8 vortec truck crank and rods with the correct oversize pistons for the LS1/LS6.
add some ls7 or aftermarket heads and some solid lifters with the big rollers and a big roller cam. for induction, I would go with a sheet metal tunnel ram with a throttle body on the front of the plenum(available altready) with some big injectors for meth.. you might want to go with an aftermarket block and custom crank and rods if you want it to last a while, though. then you could go up to a 4.125" bore and shorten the stroke to 2.96" for even higher revs and more power.

[KustomCandy]

RE: For some reason in-between researching interchangeability of parts, I thought I 'd seen or believed the 5.7 and 4.8 shared the same Bore.... Why or how, I have know idea??

As it is. I had I Finally found the real rules in detail..

[autodoctor911]

the 4.8 and the 5.3 have the same bore, the 5.3 and the 5.7,6.0,6.2 all have the same stroke.