LS3 top end swap

[stick100]

Fair play to you mate it'll be interesting to see the final result

[wav8]

Good to see results and hear it too Mikey

[paul450]

mike hope you make at least your target rwhp goal

[MyM8V8]

That's a great project! Would have liked to see it topped off with a nice cam and a set of caddy lifters. For that set up a 224-232 114 with 4 deg +ve ground in would be perfect. I do know where there is one. I'd stick a Katech C5R chain in too, single roller, not to pricey. Your stock injectors would have been fine though, and I would have kept the L92 valves too. All IMHO of course.

[ringram]

That should do more than 400rw imo.
Cam spec isn't huge if they are at the low end.

Who is tuning?

[mikeyb1987]

ringram said:

That should do more than 400rw imo.
Cam spec isn't huge if they are at the low end.

Who is tuning?

John Sleath is doing the tuning.

[mikeyb1987]

Thanks Gareth! The cam is a custom Comp Cams LSR 223/231 114. With regards to the stock injectors, I had to switch to an LS3 style. Apparently the fuel rail (although the same part no.) sits lower on LS3 engines, so LS2 injectors would not fit.

[Monaro5.7]

Ahhh some one following my lead

As i said at the meet mate look forward to ur result. Your real tatget is 420rwhp as i have 419rwhp but iam sure you will beat that with the better heads and head internals

[mikeyb1987]

Quick update:

Just rang Stuart at AAS and the cam is in and front end re-assembled. Just one query with the spring installation, and (hopefully!) it will be good to go. CAN. NOT. WAIT.

As ever, Stuart is working like a trooper, so a nice bottle of single malt may make it's way to him

[mikeyb1987]

Monaro5.7 said:

Ahhh some one following my lead

As i said at the meet mate look forward to ur result. Your real tatget is 420rwhp as i have 419rwhp but iam sure you will beat that with the better heads and head internals

Have you got LS3 heads too??

As it's an unknown (due to Gelf being the only one previous to me who has this setup), I'm trying not to get my hopes up. 420+ rwhp would be magic

[Monaro5.7]

mikeyb1987 said:

Monaro5.7 said:

Ahhh some one following my lead

As i said at the meet mate look forward to ur result. Your real tatget is 420rwhp as i have 419rwhp but iam sure you will beat that with the better heads and head internals

Have you got LS3 heads too??

As it's an unknown (due to Gelf being the only one previous to me who has this setup), I'm trying not to get my hopes up. 420+ rwhp would be magic

LS1 heads ported by AAS

[ringram]

LS3 top end should do much more as its got 40 odd extra cubes in the LS2 and better heads.
Simon your rwhp numbers are not SRR numbers though so its hard (impossible) to compare unless you both go to the same dyno.

Gelf didnt get huge numbers from his at SRR. Maybe 370rwhp from memory, but he can correct me if Im wrong.
His cam wasnt too large though.
This should do an honest 400rwhp maybe 420 even. (All based on SRR numbers)

That would be only 5 shy of the new GTS LSA

[monkfish1]

ringram said:

LS3 top end should do much more as its got 40 odd extra cubes in the LS2 and better heads.
Simon your rwhp numbers are not SRR numbers though so its hard (impossible) to compare unless you both go to the same dyno.

Gelf didnt get huge numbers from his at SRR. Maybe 370rwhp from memory, but he can correct me if Im wrong.
His cam wasnt too large though.
This should do an honest 400rwhp maybe 420 even. (All based on SRR numbers)

That would be only 5 shy of the new GTS LSA

365 in fact. Long way from 420..............

[ringram]

True, but bigger cam and more cubes.
20 cubes is worth around 30bhp...
420 might be a stretch, but I'd be game.

[EssexVXR8]

ringram said:

True, but bigger cam and more cubes.
20 cubes is worth around 30bhp...
420 might be a stretch, but I'd be game.

Derr! Don't understand the extra cubes bit as swept volume has not changed, larger combustion chamber will give it a lower compression ratio. so this will loose power unless skimmed to reduce

[ringram]

Sorry I was thinking of my 385rwhp ls1
Adding larger cam, cubes and heads to that..
I only had a 220 cam in there.

[mikeyb1987]

EssexVXR8 said:

Derr! Don't understand the extra cubes bit as swept volume has not changed, larger combustion chamber will give it a lower compression ratio. so this will loose power unless skimmed to reduce

The heads have been skinned by (I think) 0.030" to maintain standard compression.

[ringram]

Also not necessarily true due to cam timing.
Static vs dynamic compression..

[Gelf VXR]

monkfish1 said:

365 in fact. Long way from 420..............

Correct, with 216/229, 1.85 rockers, around .61 lift, wortec headers and cat back, stock intake. It made 303 in stock form, same dyno SRR.

Interestingly, g/cyl increased from .76 to .88 when I tried a custom 5" intake, the stock intake, MAF and filter represent at least 5kPa drop in MAP.

Edited by Gelf VXR on Friday 14th March 00:28

Edited by Gelf VXR on Friday 14th March 07:39

[monkfish1]

Gelf VXR said:

Correct, with 216/229, 1.85 rockers, around .61 lift, wortec headers and cat back, stock intake. It made 303 in stock form, same dyno SRR.

Interestingly, g/cyl increased from .76 to .88 when I tried a custom 5" intake, the stock intake, MAF and filter represent at least 5kPa drop in MAP.

Edited by Gelf VXR on Friday 14th March 00:28

Edited by Gelf VXR on Friday 14th March 07:39

Makes sense. Stock intake was never that great. Are you planning on changing it?