peanut port 454 1986 K30 towing - Page 3 - Chevelle Tech
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post #31 of 56 (permalink) Old Jul 1st, 19, 10:52 AM
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Tom
 
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Re: peanut port 454 1986 K30 towing

That is why I have everything cleaned and crack checked before having any machining done. Doubt that is a crack though.
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post #32 of 56 (permalink) Old Oct 23rd, 19, 10:41 PM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

Alright bringing this back from the dead.

So after saying I didn't want to spend $1k on heads. I am well on my way. Someone is selling new l29's on ebay so I bought a pair for $850. they are the factory 19256827 ( i guess 19256821 casting #) heads off of the 8.0 crate engine. Not sure if they are take offs or what. But they come with springs but no rockers. I think they are just normal l29's and need the conversion studs but the literature says the heads are normally fully adjustable valvetrain so not sure if the rocker studs are a different size. Will test when I get them.

So looking now at pistons and cams and deciding if I want to do a roller or stick with hydraulic.

I sent an email to comp and they suggested the 11-408-8

Camshaft Type: Hydraulic Roller Tappet
RPM Range: 1000 to 5000
Intake Duration: 258
Exhaust Duration: 264
Lobe Separation: 110
Grind Number: XR258HR
Intake Duration (.050" Lift): 206
Exhaust Duration (.050" Lift): 212
Intake Valve Lift w/ Rocker Arm Ratio: 0.51"
Exhaust Valve Lift w/ Rocker Arm Ratio: 0.51"
MFG. Part #: 11-408-8
GTIN Code: 036584024811
External Ignition Box Required: No
Valve Springs Required: Yes


The cam in this looked interesting

xr276hr-13

Engine Family:Chevrolet GEN VI 454 and 502 c.i. 8 Cylinder (1996-1999)
RPM Operating Range:1,800-5,800
Grind Number:XR276HR-13
Cam Type:Hydraulic Roller
Lifter Style:Hydraulic Roller
Camshaft Series:Xtreme Energy Computer Controlled
Camshaft Gear Attachment:3-Bolt
Usage:Street/Performance
Valve Springs Required:Yes
Camshaft Material:Austempered Ductile Iron
California Proposition 65:WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Advertised Intake Duration:276
Advertised Exhaust Duration:282
Intake Duration at .050 Inch Lift:224
Exhaust Duration at .050 Inch Lift:230
Intake Valve Lift:0.51
Exhaust Valve Lift:0.51
Lobe Separation:113

Maybe too much cam but seems to make solid power in the gen 6 for holdener.

Will go back through and look at peoples cam recs but open to any feedback. thanks
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post #33 of 56 (permalink) Old Oct 23rd, 19, 11:19 PM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

Sticking with flat tappet maybe more inline with my budget though,

comp 11-408-8
Camshaft Type: Hydraulic Flat Tappet
Intake Duration: 268
Exhaust Duration: 276
Lobe Separation: 114
Grind Number: CB 268AH-14
Intake Duration (.050" Lift): 222
Exhaust Duration (.050" Lift): 226
Intake Valve Lift w/ Rocker Arm Ratio: 0.525"
Exhaust Valve Lift w/ Rocker Arm Ratio: 0.525"
MFG. Part #: 11-402-4
GTIN Code: 036584610304
External Ignition Box Required: No
Valve Springs Required: Yes

I think this maybe where I am heading. I have new flat tappet lifters in the engine and it would be nice to use them rather than paying another $100 for the cam and $400 for the roller lifters.

I have a holley 750 carb I picked up. Still need to get a manifold. Would really like to do a sniper kit on this but I think for the time being I will build it with the carb.

What springs? comp 26120?
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post #34 of 56 (permalink) Old Oct 23rd, 19, 11:24 PM
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Re: peanut port 454 1986 K30 towing

Well I like that you are going to use the L-29 heads, I think with some work they will make some pretty decent power. Take a look at this build, the guy uses L-29 heads but the short block uses dome pistons. I though that was not possible with the newer heart shape chambers?

https://youtu.be/E83GBWQTGa0
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post #35 of 56 (permalink) Old Oct 24th, 19, 2:37 AM
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Gary
 
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Re: peanut port 454 1986 K30 towing

l29 heads were never on the later 8 liter big blocks. they use cathedral port heads similiar to the ls engine. do not put a cam with 114 lsa in your engine unless you want to give up 50 plus ft lbs of torque at 2k rpm. small single pattern on 108 is what you need
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post #36 of 56 (permalink) Old Oct 24th, 19, 6:34 AM
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Gene
 
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Re: peanut port 454 1986 K30 towing

No bigger than an Isky MEGA 264.

Mega Racing Cam [351264] - $194.00 : ISKY Racing Cams, Do It Right

Gene
ACES 3112/Team Chevelle Gold #62
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post #37 of 56 (permalink) Old Oct 24th, 19, 8:46 AM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

Quote:
Originally Posted by gnicholson View Post
l29 heads were never on the later 8 liter big blocks. they use cathedral port heads similiar to the ls engine. do not put a cam with 114 lsa in your engine unless you want to give up 50 plus ft lbs of torque at 2k rpm. small single pattern on 108 is what you need

These heads I bought were off an industrial crate 8.0 based on the 454. Not the 8.1 that came in trucks. This guy Vortec 8.0L - Ed Rinke Performance

Gotcha on the LSA. I will look for something in the 108 range.
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post #38 of 56 (permalink) Old Oct 24th, 19, 9:28 AM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

Some Cam choices

.518 lift
https://www.summitracing.com/parts/l...make/chevrolet

tamer
https://www.summitracing.com/parts/l...make/chevrolet

I couldn't find an isky with similar specs

this comp is pretty cheap with .485 lift.
https://www.summitracing.com/parts/c...make/chevrolet
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post #39 of 56 (permalink) Old Oct 24th, 19, 11:16 PM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

So if I go with the top cam will it be too much lift? Sorry for all the questions. I have heard the l29's run out of flow at high lift but I think that would be within its flow range but at the upper end of what I would want to run.

Brand:Lunati
Manufacturer's Part Number:10110206
Part Type:Camshafts
Product Line:Lunati High Efficiency Camshafts
Summit Racing Part Number:LUN-10110206

UPC:788120712439
Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:1,800-5,200
Intake Duration at 050 inch Lift:218
Exhaust Duration at 050 inch Lift:218
Duration at 050 inch Lift:218 int./218 exh.
Advertised Intake Duration:268
Advertised Exhaust Duration:268
Advertised Duration:268 int./268 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.518 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.518 in.
Valve Lift with Factory Rocker Arm Ratio:0.518 int./0.518 exh.
Lobe Separation (degrees):110
Computer-Controlled Compatible:Yes
Grind Number:HI-268
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post #40 of 56 (permalink) Old Oct 28th, 19, 5:54 PM
 
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Re: peanut port 454 1986 K30 towing

I went with the Clay Smith H-264-0. It is 214/214 and .500 lift on both intake and exhaust. Went with this based on their recommendation with swapping a set of the L29 heads onto my 1987 454 in my dually. They said the L29 exhaust port is so good that there wasn't a need for a split duration. It has a 110 lobe center. They ground one for me on a 112 lobe center so that it would be more compatible with my TBI. My heads are at the machine shop now getting the valve seats touched up and new springs/retainers and rotator eliminators.
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post #41 of 56 (permalink) Old Oct 29th, 19, 8:43 AM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

Quote:
Originally Posted by dieselsj View Post
I went with the Clay Smith H-264-0. It is 214/214 and .500 lift on both intake and exhaust. Went with this based on their recommendation with swapping a set of the L29 heads onto my 1987 454 in my dually. They said the L29 exhaust port is so good that there wasn't a need for a split duration. It has a 110 lobe center. They ground one for me on a 112 lobe center so that it would be more compatible with my TBI. My heads are at the machine shop now getting the valve seats touched up and new springs/retainers and rotator eliminators.
Cool so I am in the ballpark. That's interesting about the exhaust port. I have an email into summit to see what springs they recommend. Hopefully the heads will arrive this week.
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post #42 of 56 (permalink) Old Oct 29th, 19, 4:07 PM
 
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Re: peanut port 454 1986 K30 towing

Quote:
Originally Posted by tommypvt View Post
Cool so I am in the ballpark. That's interesting about the exhaust port. I have an email into summit to see what springs they recommend. Hopefully the heads will arrive this week.



I went with these springs -

https://www.summitracing.com/parts/tfs-16911-16


Those were recommended by Summit when I was considering their K1300 cam. Tech at Clay Smith said those would be great for their cam.


Retainers - https://www.summitracing.com/parts/tfs-21400425


Rotator eliminators (you need 2 sets) - https://www.summitracing.com/parts/hrs-96045
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post #43 of 56 (permalink) Old Nov 2nd, 19, 9:15 PM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

Quote:
Originally Posted by dieselsj View Post
I went with these springs -

https://www.summitracing.com/parts/tfs-16911-16


Those were recommended by Summit when I was considering their K1300 cam. Tech at Clay Smith said those would be great for their cam.


Retainers - https://www.summitracing.com/parts/tfs-21400425


Rotator eliminators (you need 2 sets) - https://www.summitracing.com/parts/hrs-96045


Cool thanks,

Ordered the cam through Lunati directly, way cheaper than summit. Be a couple weeks because I guess they are out of stock. Summit suggested the Lunati spring kit and said it was best to do the lunati springs because of warranty issues. They are really close to the ones you posted above.


I found the lunati pdf for cam selection on line and was already looking at the ones summit recommended. This whole process has been a learning experience in mostly where to look

spring kit
https://www.summitracing.com/oh/part...15k2/overview/

Though they are cheaper through Lunati as well I will try to get summit to price match.

I have decided to just use the dish pistons that are in the block I am just going to leave the short block as is and not touch it. A little bit more compression would be nice but I will wait till it gets more miles on it before tearing it all the way down. I picked up a used 750 edelbrock carb from my neighbor. I need to get an intake now. I may just end up with an air gap since the price difference to anything else isn't really worth it. I got some shim gaskets to bring down the quench. They L-29 heads are here as well. A tiny bit of surface rust on them from sitting on the shelf somewhere but nothing bad.

So will put together the heads with the new springs etc get them mounted and then hopefully the cam will arrive and I can take care of all that. I need to get back working on the truck cab so I can put it in something and test it out. But I think I am on the right path with this old beast. Hopefully it will have a nice power boost but I haven't driven the thing in so long I have no idea how it drove before.
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post #44 of 56 (permalink) Old Nov 5th, 19, 11:49 PM Thread Starter
 
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Re: peanut port 454 1986 K30 towing

Quote:
Originally Posted by dieselsj View Post
I went with the Clay Smith H-264-0. It is 214/214 and .500 lift on both intake and exhaust. Went with this based on their recommendation with swapping a set of the L29 heads onto my 1987 454 in my dually. They said the L29 exhaust port is so good that there wasn't a need for a split duration. It has a 110 lobe center. They ground one for me on a 112 lobe center so that it would be more compatible with my TBI. My heads are at the machine shop now getting the valve seats touched up and new springs/retainers and rotator eliminators.
Are you anticipating any piston to valve clearance issues? Are you switching out pistons?
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post #45 of 56 (permalink) Old Nov 6th, 19, 1:56 AM
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Tim
 
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Re: peanut port 454 1986 K30 towing

I'm interested in what the 8.0 Vortec heads are looking like with some close-up pics if you can, and what size valves do they have ???

T K
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