Any suggestions or advice on my tenative engine build/ combo would be great

[Z28lt1rocket]

I thought so too.. but I don't have enough knowledge to know what sounds right and what doesn't. Naturally aspirated, I could tell exactly everything that would work well with anything. Turbo... no idea... all of them keep telling me that I dont need to go big for a turbo application... and they were more concerned about the boost PSI I planned on running than my horsepower goal.

... What would you suggest BLACKBIRDws6 ?

...especially since im going to be running AFR 210 heads on a 330ci motor... granted its forced induction but still they are pretty big for that size motor and flow up to .650 lift and theyre only telling me lifts around .530...

[shownomercy]

Any mid frame T4 unit will work fine.

PT7675, the TC7875, Comp 7675 are all popular small turbos. You can step up to a PT88 on a T4 if you can find one, or get the new PT8847.

Or, be brave, run a T6 flange and get a S475, S480 etc...

[blackbirdws6]

I thought so too.. but I don't have enough knowledge to know what sounds right and what doesn't. Naturally aspirated, I could tell exactly everything that would work well with anything. Turbo... no idea... all of them keep telling me that I dont need to go big for a turbo application... and they were more concerned about the boost PSI I planned on running than my horsepower goal.

... What would you suggest BLACKBIRDws6 ?

...especially since im going to be running AFR 210 heads on a 330ci motor... granted its forced induction but still they are pretty big for that size motor and flow up to .650 lift and theyre only telling me lifts around .530...

Cam choice will be determined by a number of factors. I'm not sure if you plan on putting together yourself but I would ask the guy who will be building your heads/intake setup what would be best. For my build, I spoke with Lloyd Elliot and he provided a lot of great info which helped me decide on a cam. I would assume a cam in the 226/230s range with lift nearing .590 on a 115lsa may be ideal. You will need a good valvetrain with solid seat pressure to avoid floating the valves at high rpm. Going with more duration can allow a bit more lift to help keep the valve stable.

[Z28lt1rocket]

ok thanks BLACKBIRDws6 and SHOWNOMERCY.

[Z28lt1rocket]

another thing is what should the ring end gap be or should I use gapless rings ? and whats the benefit and drawbacks?

[Fastbird]

Pretty small cams for a 900hp goal.

turbo cams vs blower cams are two different animals. Remember the owner of PTK, I do believe he went over 900 with a 76GTS on a 355 with a 218 single pattern cam. I've talked this over with Lloyd also and am currently stepping down from the 234/244 .610/.610 110* cam that was in my car to a 223 single pattern, .575 lift, 113* lsa cam and expect to pick up a lot under the curve, make more power, and carry power higher and farther than the old one because I'm not blowing boost out the exhaust.

[blackbirdws6]

another thing is what should the ring end gap be or should I use gapless rings ? and whats the benefit and drawbacks?

Best to check with the ring manufacturer. For reference, my top gapless ring is at .030 since I am around 19lbs of boost. I had a bad experience with my last gapless ring set but it was determined they weren't the problem but my cylinder bores were. Supposedly the gapless sets will provide a better seal than conventional but you will hear comments go back and forth. The guy who recently refreshed my engine recommended the gapless again so that's what I went with.

turbo cams vs blower cams are two different animals. Remember the owner of PTK, I do believe he went over 900 with a 76GTS on a 355 with a 218 single pattern cam. I've talked this over with Lloyd also and am currently stepping down from the 234/244 .610/.610 110* cam that was in my car to a 223 single pattern, .575 lift, 113* lsa cam and expect to pick up a lot under the curve, make more power, and carry power higher and farther than the old one because I'm not blowing boost out the exhaust.

I agree completely with your first statement. The rest as mentioned comes down to having someone with experience making a recommendation since this wouldn't be a typical build. There are so few working turbo lt1 builds for reference which make it a challenge to try and compare one build to another for part reference. 900hp is doable but still a lofty goal considering few have done it and usually it's with more cubes. I know a big cam isn't necessary here.

[shownomercy]

Fastbird, I run a LE 224/224, you will like it.

I run regular piston rings from JE, nothing fancy. So far, they seem to be working, I also went with their recommended gaps which was around .025 I think.

[MoeHorsePower]

Everyone is correct, Like said your compression is way too low even for the 331, it will be horrible on the street from a stoplight, Mine is at 9.4.1, custom cam with a 78mm Turbo, T4. on 10lbs it has made 703 HP so far, no meth, Just to give you an idea. Lag? everyone at the shootout saw what the lag did to my Dennys Nitrous Drive Shaft...

[popo8]

Everyone is correct, Like said your compression is way too low even for the 331, it will be horrible on the street from a stoplight, Mine is at 9.4.1, custom cam with a 78mm Turbo, T4. on 10lbs it has made 703 HP so far, no meth, Just to give you an idea. Lag? everyone at the shootout saw what the lag did to my Dennys Nitrous Drive Shaft...

lol.. ohhh yeah we did.

LTXtech.com is my DRUG!