RSX302 Future--Engine Poll...

[93Polo]

What's the difference with the stock LS6 block sleeves vs any of the others?

I'm finding that all the stock LS blocks are capable of holding high hp, but at the cost of sleeve expansion and blowby.

I'm also catching the hint with the stock heads. I'm thinking AFR,Allpro...etc will be necessary.

Since the Ford is 10 bolt, I'm use to the sealing issue..My 302 uses 1/2" studs, Cometic MLS gasket and Permatex spray head sealer. No issues what so ever at 750-800hp. All surfaces are better than 15ra. I found this was key to the seal.

Thx for the info!

http://www.idavette.net/hib/ls6/page3.htm for the LS1 vs LS6 block.

The LS6 has the best ventilation of the 5.7 blocks. I wouldn't be concerned with any weakness due to the change in sleeve design for the ventilation. The 97/98 blocks have thinner walls but many have put forged pistons in and run nitrous.

I have heard the rumors that LS heads could be put on a Ford block never a read of a finished motor. Many have used 302/351W headers by cutting off the flanges and welding on LS flanges, the RX7 LS swap guys really explored that mod.

The LS7 blocks from what I've read are most likely to have the bores distort but isn't Stielow running a LS7 block in his latest build using a LS9 top end with blower?

I agree on the aftermarket heads and would go with an AFR or TFS.

IMO LS6 or LS2 block, forged rods/pistons on a stock crank with a some heads that you get a solid deal on and you'll turn big #s on a relative budget. Is the cool factor of a LS7 block build worth small tq gain and extra risk of head gaskets, $$, etc.? IMO no.

Gokou has a nice LS2 TT build going:

http://www.chevelles.com/forums/showthread.php?t=302484

If you have the budget and are not concerned with the weight a LSX block with 6 bolts heads would likely be the most reliable.



A hot ticket on LS1tech now seems to be turbo Mustangs using a 5.3 as the compression is low and motors can be cheap and easily.