Jrdrag2562

Looking this winter to do a cam swap with a brian tooley stage 3 cam on my ls2 and want to cut the heads down to give a 11.7 to 12:1 compression ratio. Has anyone done this yet? I tried to search the forum but cant find anything that relates. I'm sure trunion upgrades and pushrod length are a requirement and I want to upgrade rods and pistons and have them flycut already. I'm thinking .175 on intake and exhaust should give me plenty of piston to valve clearance. I'm looking for things I haven't taken into consideration that some forum members can inform me about. Also if someone can give me estimated power numbers I can expect. Only upgrades it currently has is vararam SC, headers, and 150 shot of N20. Like I said itll have the cam in it when the heads get cut down. any info will be helpful. Id rather have my chickens in a row before I start tearing into it.

xBoostx

Will not tell you what to do but your bottom end plan is solid, for street & strip car I would not increase compresion too much unless includes E85 my experience is best with reasonable compression a larger shot with a good set of heads.

Jrdrag2562

e85 has been a toss up for me. I really would like to do it but I'm not sure about it just due to consistency.

Ragtop 99

If you are pulling the heads off you might consider a swap to LS3 heads since you are fly cutting the pistons. Its not too expensive, especially if you find a used set.

I haven't seen many people go above 11.5 for cars aiming for a 7000 rpm shift point. 11.2 - 11.5 seems to be commonly used for typical street cams. Brian Tooley can you some guidance on whether going above 11.5 will do much for that cam or just create tuning headaches. Alternatively, if you go to 12:1, he may suggest a custom grind to better with that compression.

xBoostx

Make an educated decision buy an e85 test kit and test the avaliable pumps in your area and don't go by what you read on line.
I went e85 with my 14.1 to 1 heads and llsr cam street ls3 and just loving it I have tested e98 and e100 out of a one mile radius stations and lowest I seen is e83.

Jrdrag2562

See that's what I'm looking for. I live with another LS fan and hes trying to steer away from the LS3 due to weird geometry in the valve train. I mean if it works... it works I just would have to switch to all square port stuff right?

Jrdrag2562

E85 is very common in Indianapolis but at the same time CAM2 and Dragon Racefuels is pretty common at the gas station as well. There are a decent amount of e85 guys I know around town and they all say the same thing (that its not very constistant.) However the lowest they can vouch for is 87. I would definitely test the fuel around town before I commit to a flex fuel set up.

Ragtop 99

If you weren't already planning to fly cut, I'd wouldn't suggest them. IIRC, it's pretty straight forward just the heads and intake manifold. There are several threads on here, some old, with guys walking through the swap.