dan.b

iTrader: (1)

in between btr4 and ms4 for a cam only 150 shot ls1. planning on spinning to atleast 6600 to get max effort out of either. im not an expert on cams and looking for some advice. if anyone has experience with either or both, what power did it make? a buddy has a cam only btr3 and makes somewhere around 420 wheel, from driving that i decided to go with a stage 4, but have seen good numbers from ms4 cars aswell, so what are the main differences involved with btr4's more overlap compared to ms4s more lift and higher duration? are the cam cores and lobes different?

btr4 235/242 .621"/.592" 111+3
ms4 239/242 .649"/.600" 111

thanks

Jtm2085

iTrader: (1)

I like my btr 4. But I would spin which ever you go with to 7k.

BREWS02WS6

iTrader: (6)

How come his cam made you want stage 4? Not busting your chops here, but tons of guys go with large cams and hate their cars afterwards. Some questions you'll be asked before anyone can really help you out...

What supporting mods will you have? M6 or A4? You plan to measure PTV and pushrods right? What are your goals here (daily driver, track, etc)?

dan.b

iTrader: (1)

his car makes good power upstairs, I just want something more aggressive. My car is M6, supporting mods will include btr's spring kit with retainers, chromoly pushrods, and comp cams rocker arm trunion kit. My builder will take care of measuring ptv and if necessary flycutting. street/strip

HCI2000SS

iTrader: (2)

Regardless of which of those 2 cams you decide on I'd do at least a 3.90 or 4.10 gear with the M6. Otherwise is consider a smaller cam

dan.b

iTrader: (1)

3.90 is the plan. I just want a max effort cam with the 150 shot and I don't mind spinning to 6600-6900 to get the best times out of it. I've heard good things about both and have seen great numbers from both, but more people lean towards btr. Was just curious as to the advantages or disadvantages comparing the 2, since I can't find much on it on tech

HCI2000SS

iTrader: (2)

Gotcha. Yeah the 3.90 is a solid choice. One thing to consider about the old MS4 cam is that it was ground on aggressive lobes, so it will wear springs faster and be a little harder on the valve train. Not sure if they've revised recently but that's the way it used to be. I cant speak for the BTR 4

Rise of the Phoenix

iTrader: (27)

I may be wrong, but I believe the MS3 and MS4 cams are now ground on different lobes. I know Texas Speeds has their own cam grinding machine and I believe all of their lobes are proprietary.

HCI2000SS

iTrader: (2)

Yep I've heard this as well, but wasn't sure on the MS4 cam

joe1998ls1

I'm having almost the same set up put in my car now except I have a set of 799 heads....(a4)..my builder told me I would need a fuel pump for a 150 shot.... you may want to ask about that

dsadsdaiouser

What about needing new injectors? I started another thread asking if I'd be able to drive mine to the dyno after we do a cam only swap (Tick SNS Stage III) and someone suggested injectors. I don't personally think that would be necessary at around 400 to the wheels. What do you think?

Sales2@Texas-speed

iTrader: (5)

That includes the MS4 as well. We use extremely valve train friendly lobes and Callies cores on all of our cams. Our cams are also the most accurate that I've seen so far. We have tested the other commonly used cams that are offered out there and ours are by far the most accurate.

Public Enemy

BTR STAGE 4 here and it really works well with my setup

HCI2000SS

iTrader: (2)

Good deal. Glad to see you guys are redoing the old ones to

FourG63 97GST

iTrader: (1)

I liked my MS4, made power all the way to redline, which was 7200
the nitrous loved it too. only reason I got rid of it, is because I went turbo

CAMMOTION PERF

For max effort street type cars up to a 250 shot of nitrous, have a look at our new Titan King LS1 camshaft: http://store.cammotion.com/titan-king-cathedral-port

gotboost

Question to Texas speed. I'm also considering your MS4 cam. Do you guys have any objective data that you can present or any comparisons you can make in regards to your new cores that you grind your cams on?

NAVYBLUE210

I would want + 6-8* exhaust split for 150 shot with stock heads
And max effort my .02. I would do CAM MOTION Cam mentioned,
Or BTR 4 pretty close to each other really.

rpturbo

iTrader: (47)

IMO you should at least, swap to the 36/42# white factory GM 3800 supercharged injectors. They are SOOOO cheap, there is no reason NOT to. The dc get too high otherwise.

NAVYBLUE210

^^^^^^agreed!!!!^^^^^^