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Hi guys a run down on my iron 5.7
Lsa crank
forged summit rods and pistons -3
Ls7 gold clip lifters
Arp mains big ends head bolts etc
Electric water pump
25% under driven pulley
No accessories on engine
862 heads intake valves upgraded to 1.95
Shaved .035 off heads now 59cc
spring up grade titanium retainers
heads flowing to 285cfm @ 600 lift
btr shaft mount rockers
trail blazer ss ported &ported 92mm throttle body
Long Tube headers
Twin 3inch exhaust
Spintech 6000 mufflers
4l80e box with convertor to suit cam
Compression 11.45
Car weighs 2500lb weekend / drag/ street
earlier in the build we chose a 226/232 cam but we have alot more compression heads etc and my engine builder says we need more ,maybe something in the higher 230s to 240s Duration. I am wondering what you guys suggest I've looked at possibly the titan 5 a summit high lift cam or Even the fti street sweeper 236/240 111 631 610 or a comp cams 235/243 621 624 on a 113 I'm not sure which one will be better ?
Or does anyone have a better suggestion I would like to make decent power seeing I've went this far with it .
IMO the answer is always "the biggest one that doesn't have annoying drawbacks."
So let's talk about the drawbacks that happen if you go too big:
How much do you care about surging/bucking at low RPM?
How much do you care about valve spring life?
Where do you want your powerband to start?
What's your current RPM limit, and are you willing to go higher?
Yes agree always a draw back when going big ,obviously im going to need a high stall with the car the engine builder wants to make use of the compression and car being light and plus its a weekend fun car so I can put up with some drivability issues. I think ideally want the power in around 3300 to 7500 and this is why we used the lsa crank to spin high revs.
Pcm will be full haltech controlled ,I thought the intake maybe a little limiting in the high revs my engine builder wants to spin it to 8k as we are using full forged bottom end ,I may have to change intakes then at that high of rpm.
That streetsweeper is an amazing cam. Years ago, A guy named Christian in Miami had a C5 with the streetsweeper and put out 511whp. Torque was probably about 450. Do you have larger gears to help handle a larger cam?
Who made your 226/232 cam and what are the specs? Thinking of selling it? Im looking for a cam of that size
That's great bit of news I was wondering how well that cam performed I've heard Ed makes some good grinds on his cams ,also I've sold the cam but crow cams in Australia make them and they have got decent numbers all round with that grind even on stockist motors it's a great all rounder. If you look up independant motor sports they have alot of dyno runs on different cars with that cam.
I’m running a 227/232 114+1 cam in my LS3 with 11.8:1 CR on 92. A 226/232 in a 5.7 is already relatively wilder than what I am running. So, I don’t think you “need” more cam due to your CR. Regardless of what cam you use, the stock intake is going to start limiting power above 6500 rpm, anyway.
The cam you have already seems fine to me for a multi purpose vehicle.
I've seen intake mentioned a few times but no word of what intake you are using. Is it TB SS to match the TB? That's a damn good intake and performs as well as a fast 90 when ported. Your build is getting so radical though that you might want a fast 102.
Yes abs it's a ported trailblazer with ported Throttle body to match . I noticed summit has a new low and high version runner intake which I will see how they perform once someone does some testing on those to.
Yes abs it's a ported trailblazer with ported Throttle body to match . I noticed summit has a new low and high version runner intake which I will see how they perform once someone does some testing on those to.
I would just get that ported. Metal intake usually just help at high rpms and not so much with low or mid range tq. What car is this and what gears will you be running? Depending on gears, your original cam might be the best for your build, also depending on your goals.
That streetsweeper is an amazing cam. Years ago, A guy named Christian in Miami had a C5 with the streetsweeper and put out 511whp. Torque was probably about 450. Do you have larger gears to help handle a larger cam?
Who made your 226/232 cam and what are the specs? Thinking of selling it? Im looking for a cam of that Pendentif Pandora
Torque was probably about 450. Do you have larger gears to help handle a larger cam?
The car is a 1958 fcholden which is light at 2500lb gears a going to be 3.73 although can change to 3.9 if needed ,but as im running the 4l80e that would help ,the car is not daily will see sometrack time but also weekend fun / drag and drive events to.
The car is a 1958 fcholden which is light at 2500lb gears a going to be 3.73 although can change to 3.9 if needed ,but as im running the 4l80e that would help ,the car is not daily will see sometrack time but also weekend fun / drag and drive events to.
How much converter stall speed are you comfortable with?
@Summitracing is the expert here, but in addition to the streetsweeper, I like the stage 3 extra clearance for you if you don't want to go too radical, or the Stage 4 LS if you do.
@Summitracing is the expert here, but in addition to the streetsweeper, I like the stage 3 extra clearance for you if you don't want to go too radical, or the Stage 4 LS if you do.
have to agree abs with your choice but also summit guys will definitely have a good idea on their choice .
Pcm will be full haltech controlled ,I thought the intake maybe a little limiting in the high revs my engine builder wants to spin it to 8k as we are using full forged bottom end ,I may have to change intakes then at that high of rpm.
You definitely need a different intake. You will need a short runner intake to actually make power at those rpms. The longer runner (factory) intakes peak around 6,000-6,800 rpms, depending on the cam. I would give that new Summit intake a try. It looks pretty sweet, and will make power where you are wanting it.
05-26-2024, 05:48 AM
Change of direction cam help 
