370 build need help on picking heads
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Teching In
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370 build need help on picking heads I am in the process of getting all my parts together for a 370 build. I have a 03 lq4 block getting bored .030 over. I am running stock crank but aftermarket rods and pistons. I got a good deal on a spinmonster 230/234 .613 .598 lift 114+2 cam and dual valve springs. I have a good set of untouched 799 cathedral port heads and untouched 823 rectangle port heads. I have a rectangle port truck intake but am not against getting something different. I haven't ordered pistons yet, was trying to figure out which heads I was gonna use. This is going in a s10 4x4 street mud truck. Which heads would best suit my needs? I want to make the best power possible but also broad torque curve. Is 500 fwhp possible from one of these combos?
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From: Coast of San Mateo County Between Pacifica & HMB
Cam too big for rectangle heads especially for 4x4 truck.
500 FWHP possible with either head. Cathedral may
Need porting. Square ports need different cam, something like
224*/232* for truck and broad torque curve.
500 FWHP possible with either head. Cathedral may
Need porting. Square ports need different cam, something like
224*/232* for truck and broad torque curve.
Go with the 823 heads. You will have a decent cam selection since you have aftermarket Pistons with valve reliefs. I'd call up Martin@Tick and have him work up a camshaft for your goals. 500 whp is a lofty goal but I'd bet it would make 460-480 with a relatively mild camshaft and still make good torque. You do have a lightweight truck to work with, so a loose converter and larger camshaft could work well also.
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Hard hard choice between your two heads. Both can get the job did. What intake is you plan on running? Carb or fuel injection?
Hot Rod magazine did a 6.0 build and installed L92 heads with a carb and headers plus a tune. They tested 3 different cams from crane. First they installed a 210/218 camshaft and the motor cleared 460 horses and over 460 ft pounds of torque. This cam was the torque monster in battle which was the smallest cam tested and being the most tame as well. Every cam they tested after that was bigger and ended up losing torque but gaining horsepower in upper rpm band.... 500 horse is achievable with a bigger cam but you won't have the low end grunt as the small cam have. Hope this helps and makes sense....
Hot Rod magazine did a 6.0 build and installed L92 heads with a carb and headers plus a tune. They tested 3 different cams from crane. First they installed a 210/218 camshaft and the motor cleared 460 horses and over 460 ft pounds of torque. This cam was the torque monster in battle which was the smallest cam tested and being the most tame as well. Every cam they tested after that was bigger and ended up losing torque but gaining horsepower in upper rpm band.... 500 horse is achievable with a bigger cam but you won't have the low end grunt as the small cam have. Hope this helps and makes sense....
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Teching In
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Definitely gonna keep fuel injection. I already have the cam and didn't know which set of heads would be the better choice to match it. If I go with the cathedral port 799 what intake would be the best. I have plenty of hood clearance so would a nnbs truck intake be sufficient?
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Your best bang for the buck intake is go be a Trailblazer SS intake. It's been proven to add roughly 20 hp/20 ft lbs of torque over the regular truck intake. Used they sell roughly for 125 bucks......
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I was facing an almost identical situation with the differences being LQ9, and a dual purpose street strip car that would see more street. I sold the 823' in favor of the 799' that i intend to send to Advance Induction. This was my choice based on good research and learning that the 823' make more usable power in the upper rpm'and I wanted PLENTY of midrange power.
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Teching In
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It seems like they should make about the same power with either set just the 799 heads would bring the power in sooner. I thought that the trailblazer ss intake was the same as the nnbs truck intakes? If the trailblazer ss intake will support 500 hp then I will go with that.
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Whole combination just seems wrong, especially for the type of truck you're putting this into and what it's meant to do.
Unless you go crazy high compression, those heads and cam will make for a high RPM powerband. I imagine a mud truck needing all the lowend grunt you can get, which low end + big port heads + decently big cam don't go well together.
And cams are not expensive, and you can always sell the spinmonster to recoup the money that it would cost you to get a new cam. It's not worth it to put in a mismatched cam just cuz you can save 100 bux.
I'd get some 5.3s ported, a nice high teens low 220s cam with an truck cathedral intake and let her rip.
Unless you go crazy high compression, those heads and cam will make for a high RPM powerband. I imagine a mud truck needing all the lowend grunt you can get, which low end + big port heads + decently big cam don't go well together.
And cams are not expensive, and you can always sell the spinmonster to recoup the money that it would cost you to get a new cam. It's not worth it to put in a mismatched cam just cuz you can save 100 bux.
I'd get some 5.3s ported, a nice high teens low 220s cam with an truck cathedral intake and let her rip.
I was gonna get -4cc flat tops which would put it close to 11:1 with the 799 64cc chambers.
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With .040 Cometics, 64cc chambers, and -3cc pistons, you'd be at roughly 11.2:1 with the assumption that the pistons come .006" out of the hole.
For a mud truck, you want low and midrange torque and an intake with long runners. I would get a NNBS truck intake, use the 799s over the 823s, and get a cam with minimal overlap that is designed to operate in the lower RPM range. I would even go so far as to say to just stick a stock 6.0 truck cam in the thing.
For a mud truck, you want low and midrange torque and an intake with long runners. I would get a NNBS truck intake, use the 799s over the 823s, and get a cam with minimal overlap that is designed to operate in the lower RPM range. I would even go so far as to say to just stick a stock 6.0 truck cam in the thing.
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So your saying if I put it in a 2wd s10 that's light and would only see street and strip it would be different? I have seen several threads where this cam makes good torque as low as 3500rpm. Actually this truck is not strictly mud truck. I started last year competing in a trifecta trick series. Friday night drag night at the track, saturday night a truck sled pull where you add enough weight to make the truck weight 6200lbs, then take all the weights back off and put 35" boggers on the truck and make 4 mud runs at mud bog on sunday. And driving back and forth home each day which equalms about 250 highway miles. Person with most points at the end of the weekend wins. So with all that in mind. Tell me what I should do. I am running a 4l80e 205 cast iron gear driven t case and 14 bolt ff rear with 4.10s as of now that may possibly get changed.
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Being that trifecta truck series is spread out over a weekend, I would be swapping cams based on the evening's event. I would have one cam for the drag racing, one cam for the sled pull, and one for the mud run.
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I think I might just stick with the 799 heads and trailblazer ss intake. The cam does seem like it might work better with the cathedral port and the compression boost should help that low to mid range torque. I guess I will hang on to the 823 for a future build.
823 heads make more torque......similar build https://ls1tech.com/forums/dynamomet...ake-4l60e.html
Most people telling you to use 799 heads are just quoting what they read on the Internet. I've seen countless cam only square port cars make more power than h/c/i cathedral cars with the exception of aftermarket castings. But would you rather spend 1k on square ports or 2500 on a good set of aftermarket cathedrals to make the same power. It's a no brainer.......
Most people telling you to use 799 heads are just quoting what they read on the Internet. I've seen countless cam only square port cars make more power than h/c/i cathedral cars with the exception of aftermarket castings. But would you rather spend 1k on square ports or 2500 on a good set of aftermarket cathedrals to make the same power. It's a no brainer.......