View Poll Results: Which engine combo to build?
Serious but streetable 383ci all stroke with AFR 225's
77
28.84%
402/408ci LS2 buildup with AFR 225's
190
71.16%
Voters: 267. You may not vote on this poll
Quick Poll.....
I like the idea of using the LS2 block bored to 4.005" with the stock 3.622" stroke and billet rods and forged pistons. It'd be as cheap as a 383 with an Eagle crank, but would rev a lot easier, and would have the larger bore for better flow.
365cid anyone?
365cid anyone?
Teching In
Joined: Dec 2004
Posts: 4
Likes: 0
the cost of pulling the engine and 2k+ for a rotating assembly for 37 cubic inches is not very cost effective in my opinion. I think the article CF did on your car with a stock short block is a much better deal for the money. INMHO if your going to take a good engine out of a car -- than go for 427 with your big heads.
Originally Posted by Mike's 99
the cost of pulling the engine and 2k+ for a rotating assembly for 37 cubic inches is not very cost effective in my opinion. I think the article CF did on your car with a stock short block is a much better deal for the money. INMHO if your going to take a good engine out of a car -- than go for 427 with your big heads.
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On The Tree
Joined: Feb 2004
Posts: 188
Likes: 0
From: Pembroke Pines, Fl
PLEASE do a 346ci buildup with these things. That's what I am going to do, just want to see what others are going to make with it. Is it even possible using the stock pistons and G5X2 cam?
On The Tree
Joined: Dec 2003
Posts: 109
Likes: 0
My vote is for the 402. You buy stroker parts and invest the time for either of them. Once you've done that you might as well opt for the LS2 block. As long as you're at it it's just not that much more expensive. As time goes by and the factory makes more of them it will get even less expensive. The LS2 will soon make the 383 a thing of the past.
You're gonna do a 402 Tony
come on... you know you are. Besides, I want to see how you get the C5 PCM to work with the LS2 knock sensors.
While I have your attention let me say thanks again for your help on my A4 Vette with the 205's. Took it out for a run at the 1/4 last weekend. Even with just a 2800 stall and 1.85 sixty foot times I was turning 11.75's @ 120 MPH back to back. I even managed an 11.64 on one pass and if you are curious I was running MT ET Street Radials, 275/40/17.
You were right about the torque. I can't believe how hard it pulls and it's going to get better because I have a higher stall converter going in soon. This was the first time out on a 1/4 track with the new setup. It won me the Super Muscle bracket class at Hallsville (cars between 11.50 & 12.69)
It all works unbelievably well and it has fantastic street manners.
THANK YOU TONY!
You're gonna do a 402 Tony
come on... you know you are. Besides, I want to see how you get the C5 PCM to work with the LS2 knock sensors.While I have your attention let me say thanks again for your help on my A4 Vette with the 205's. Took it out for a run at the 1/4 last weekend. Even with just a 2800 stall and 1.85 sixty foot times I was turning 11.75's @ 120 MPH back to back. I even managed an 11.64 on one pass and if you are curious I was running MT ET Street Radials, 275/40/17.
You were right about the torque. I can't believe how hard it pulls and it's going to get better because I have a higher stall converter going in soon. This was the first time out on a 1/4 track with the new setup. It won me the Super Muscle bracket class at Hallsville (cars between 11.50 & 12.69)
It all works unbelievably well and it has fantastic street manners.
THANK YOU TONY!
JRP has the 6.0l block history down right. People were hesitant to do an iron 402 because of the weight, unless they were FI. With the Al. block affordable, if you are looking for top performance, the 402s extra cubes (and additional bore for the heads) is the way to go.
Anyone looking for a streetable, torquey 383 set up could accomplish that using the 205 heads and short duration, tight LSA cam such as 226/226 110. Wouldn't be an optimal drag racer, but from 2000 - 5500 rpm you would have tons of torque and awesome throttle response.
Anyone looking for a streetable, torquey 383 set up could accomplish that using the 205 heads and short duration, tight LSA cam such as 226/226 110. Wouldn't be an optimal drag racer, but from 2000 - 5500 rpm you would have tons of torque and awesome throttle response.
402/408....really would rather even see something with a sleeved block (big bore)......say 388(bore) or 427..... 
more interested in what the 225CC heads will do on a large CI motor.....big CI/high RPM engines are the ones that are really in need of more head flow......I know thats what I'm waiting for before I dump $3K+ on new heads.........
more interested in what the 225CC heads will do on a large CI motor.....big CI/high RPM engines are the ones that are really in need of more head flow......I know thats what I'm waiting for before I dump $3K+ on new heads.........
Originally Posted by jrp
had you possed this question a year ago the 383 probably would of been the way to go. but with the massive interest in the aluminim 402's (just check SDPC's thread in the ls2 section), and the results mikey has shown with his 402 build ups its a no brainer. a 402 stroker shortblock will run you ~4500 after tax and shipping w/ no core. and with the new ls2 block people dont have to decide if the weight gain of the 6.0 iron block is worth just doing an all stroke 383. the 402 makes the most business sence as it will only grow in popularity especially after the KS issue has been worked out.
the 383 would be a nice build up but it seems to be catering to a smaller and smaller audience.
whatever you do Tony im sure its gonna be killer
the 383 would be a nice build up but it seems to be catering to a smaller and smaller audience.
whatever you do Tony im sure its gonna be killer
Guys...
I never followed up with our little "exercise"....
The 402/408 is on the drawing board....Seems it was pretty much a landslide and the LS1 Tech community has spoken!
It will be with the new LS2 block (obviously)....just waiting on more input regarding the safe "bore limit" which will determine the final displacement.
I though it would also help me to perhaps share some information regarding the swap and what I encounter building and installing an LS2 based engine in my C5 (F-Body should be no different except for the TBW). I know ALOT of people are considering the very same move...
Thanks for all your responses....I was hoping to get a poll of significant "depth".
Regards,
Tony
I never followed up with our little "exercise"....
The 402/408 is on the drawing board....Seems it was pretty much a landslide and the LS1 Tech community has spoken!
It will be with the new LS2 block (obviously)....just waiting on more input regarding the safe "bore limit" which will determine the final displacement.
I though it would also help me to perhaps share some information regarding the swap and what I encounter building and installing an LS2 based engine in my C5 (F-Body should be no different except for the TBW). I know ALOT of people are considering the very same move...
Thanks for all your responses....I was hoping to get a poll of significant "depth".
Regards,
Tony
TECH Resident
Joined: Dec 2004
Posts: 881
Likes: 1
Just adding a little...if the LS7 block (not to mention crank) is available for approximately the same (or say 20-40%) more than a stock LS2 block/crank, why wouldn't 427s and maybe 441s really be the default sizes in the fall?
