454 Cam Choice for 4X4 truck [Archive] - Chevelle Tech

: 454 Cam Choice for 4X4 truck


14BFF
Apr 18th, 08, 5:58 PM
hi

I am gathering parts for a 454 BBC budget build for my k15

the truck is 1986 GMC K15
14BFF + 10bolts >> 3.73 gears
SM465 Trans + NP205 Transfer Case
33" tires
total weight with 350 SBC is almost 5000 lbs ( more with the BBC )


454 truck motor from a mid 80s Burb ( + 0.030 overbore )
236 peanut port heads + oversized valves 2.19/1.88 + DIY porting
stock crank + stock rods ( with ARP bolts )
TRW L2399F30 pistons ( SCR = 9:1 ) OR TRW L2349F30 pistons ( SCR = 10:1 )
Performer RPM intake ( square + spread pattern )
Performer 1407 750 cfm carb ( with offroad needle kit ) OR a Q-Jet carb
HEI dizzy with MSD module and coil ( MSD6AL is also available )
long tube headers + dual 2.5 exhaust + Throush glasspack mufflers

the truck is used in sand dunes + street + sometimes in the mud
and I want to retain the AC/PS/power brakes and be able to use low octane fuel

also I don't want to spend a lot on the valve train since I am not going to wind it past 5500 RPM


can you please guide me to choose a good cam for this application ?

your suggestions is highly appreciated

thanks

Ahmed

pdq67
Apr 18th, 08, 6:21 PM
Sure, a cam from UDHarold like his..

272/217, 112/? .515" lift. Per Harold, "It's the best cam for pulling trailers, car-hauler or boats. Excellent bottom end and mid-range torque. Works power accessories. 1600-5500." and

276/221, 112/?, .515" lift. And again, per Harold, "The cam for pick-ups, 4 W.D. mud racers, performance and mileage on the interstate. 9:1 compression, 3.50 gears and up, and headers help. 380 HP at 5000 RPM. 1800-6000.

OR one of his SOTA cam's for your application.

pdq67

14BFF
Apr 18th, 08, 6:27 PM
thanks a lot
where can I buy these cams ( online ) ?
and with this lift is it necessary to upgrade the stock valve springs ( I will install new replacements ) ?


also what do you think of these cams ?
http://store.summitracing.com/partdetail.asp?part=CRN%2D10307
Crane Cams 10307
Duration at 050 inch Lift: 226 int./226 exh.
Advertised Duration: 282 int./282 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.533 int./0.533 exh. lift
Lobe Separation (degrees): 108


http://store.summitracing.com/partdetail.asp?part=CRN%2D10306&view=1&N=700+
Crane Cams 10306
Duration at 050 inch Lift: 228 int./228 exh.
Advertised Duration: 284 int./284 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.544 int./0.544 exh. lift
Lobe Separation (degrees): 112


http://store.summitracing.com/partdetail.asp?part=CCA-11-242-3
Comp Cams XE268h
Duration at 050 inch Lift: 224 int./230 exh.
Advertised Duration: 268 int./280 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.515 int./0.520 exh. lift
Lobe Separation (degrees): 110


http://store.summitracing.com/partdetail.asp?part=CCA-11-246-3
Comp Cams XE274h
Duration at 050 inch Lift: 230 int./236 exh.
Advertised Duration: 274 int./286 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.552 int./0.555 exh. lift
Lobe Separation (degrees): 110


http://store.summitracing.com/partdetail.asp?part=CCA-11-239-3
Comp Cams X4 270H
Duration at 050 inch Lift: 226 int./234 exh.
Advertised Duration: 270 int./278 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.544 int./0.564 exh. lift >> too much lift ?
Lobe Separation (degrees): 111

thanks again

Ahmed

dirtlips408
Apr 18th, 08, 6:34 PM
I have a similar set up in my 1 ton BBC powered Jeepster Commando. I use it for rocks,mud,sand dunes. It works killer! Here is the combo:

454
appox 9 to 1
Performer RPM
Carb shop 800 cfm Q-JET
Comp 280H.....280/280....230/230....520/520.....110
Fulley Ported 063's closed chamber heads....2.19/1.88's
Proform HEI
1 3/4" shorties....2.5" dual to 3" single exhaust(no room for duals)

Also look at the Comp extreme 4x4 series cams

14BFF
Apr 19th, 08, 11:37 AM
I have a similar set up in my 1 ton BBC powered Jeepster Commando. I use it for rocks,mud,sand dunes. It works killer! Here is the combo:

454
appox 9 to 1
Performer RPM
Carb shop 800 cfm Q-JET
Comp 280H.....280/280....230/230....520/520.....110
Fulley Ported 063's closed chamber heads....2.19/1.88's
Proform HEI
1 3/4" shorties....2.5" dual to 3" single exhaust(no room for duals)

Also look at the Comp extreme 4x4 series cams



how is the low RPM torque with the 280h ?


I have looked @ Xtreme 4x4 cams and this one produces very nice torque curve on Desktop Dyno but it has big lift that requires expensive springs

Comp Cams X4 270H
Duration at 050 inch Lift: 226 int./234 exh.
Advertised Duration: 270 int./278 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.544 int./0.564 exh. lift >> too much lift ?
Lobe Separation (degrees): 111


thanks

pdq67
Apr 19th, 08, 12:03 PM
Either one of the two UDHarold cams I listed b/c that's what Harold said he made them for.

Can't go wrong w/ one of his cams, imho.

Call Harold at 662-562-4933, and please say hello to him from ol' pdq67.

Bullet and whoever Lunati is now should have them also.

pdq67

14BFF
Apr 19th, 08, 3:35 PM
WOW !
the 276/221, 112/?, .515" lift. cam made insane power and torque in Desktop dyno
even better than others with higher duration and lift (voodoo 60203, Xtreme 4x4 270 ... etc )

http://i164.photobucket.com/albums/u29/safwaneez/dyno.jpg

but why it is so expensive compared to others ?
http://store.summitracing.com/partdetail.asp?part=LUN%2D302A5LUN&autoview=sku

thanks Paul

Ahmed

dirtlips408
Apr 19th, 08, 4:58 PM
how is the low RPM torque with the 280h ?


I have looked @ Xtreme 4x4 cams and this one produces very nice torque curve on Desktop Dyno but it has big lift that requires expensive springs

Comp Cams X4 270H
Duration at 050 inch Lift: 226 int./234 exh.
Advertised Duration: 270 int./278 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.544 int./0.564 exh. lift >> too much lift ?
Lobe Separation (degrees): 111


thanks



Low end torque is fine....Im running an auto with a Hughes 2500 stall and doubled up T-cases. I can light the 39.5" tall Boggers up no problem!

I was planning on going with that X4270H but it was not in stock so I went with the 280H. I am very happy with its performance.

pdq67
Apr 19th, 08, 5:28 PM
Ahmed,

"but why it is so expensive compared to others ?"

I figure you mean compared to the cheap Summit cams here!!

You are paying for a cam that a guy named UDHarold has figured out that for your combination will work GREAT, (i.e., like you want)..

And fwiw, I bugged Harold to create for me a solid lifter BB cam that is a copy of CC's great old 288AR solid street roller cam and he did!

It's in my bedroom closet now!!

It's a 278/249/161, 110/106, .618" lift that need's .018" lash cam!

I figure it is about the BEST solid lifter mild 496" engine grunt cam going!

pdq67

14BFF
Apr 20th, 08, 5:37 AM
thanks Paul

it is still more expensive than all other brands Comp, Crane, VooDoo ... etc

but, I think I will buy it

do you think it is OK to use stock replacement springs @ this lift level ?

TNTRacing2
Apr 20th, 08, 11:40 AM
hi

I am gathering parts for a 454 BBC budget build for my k15

the truck is 1986 GMC K15
14BFF + 10bolts >> 3.73 gears
SM465 Trans + NP205 Transfer Case
33" tires
total weight with 350 SBC is almost 5000 lbs ( more with the BBC )


454 truck motor from a mid 80s Burb ( + 0.030 overbore )
236 peanut port heads + oversized valves 2.19/1.88 + DIY porting
stock crank + stock rods ( with ARP bolts )
TRW L2399F30 pistons ( SCR = 9:1 ) OR TRW L2349F30 pistons ( SCR = 10:1 )
Performer RPM intake ( square + spread pattern )
Performer 1407 750 cfm carb ( with offroad needle kit ) OR a Q-Jet carb
HEI dizzy with MSD module and coil ( MSD6AL is also available )
long tube headers + dual 2.5 exhaust + Throush glasspack mufflers

the truck is used in sand dunes + street + sometimes in the mud
and I want to retain the AC/PS/power brakes and be able to use low octane fuel

also I don't want to spend a lot on the valve train since I am not going to wind it past 5500 RPM


can you please guide me to choose a good cam for this application ?

your suggestions is highly appreciated

thanks

Ahmed

Here is the best advice: Contact Chris Straub and he can perfectly match your combo. Here is his contact info. He is also a member here.


http://www.straubtechnologies.com/

pdq67
Apr 20th, 08, 2:50 PM
A set of Crane's kit springs will do nicely, imho.

They sell two kits, One that install's at 1.88" and the other that install's at 1.80" for later BB heads. Check which kit you need?

And right, Chris too!

pdq67

14BFF
Apr 20th, 08, 5:04 PM
TNT

thanks for your advice but I am from saudi arabia and I usually buy from summit racing so I need to pick an off the shelve grind


Paul

this is the kit you are refereing to

Chevrolet V-8 80-95 Truck 366-396-402-427-454 cu. in. ---PN 13309-1
(w/Short valve spring assembly height)
Valve Spring PN 96801-16 Steel Retainer PN 99957-16

Most 1981 and newer Chevrolet and GMC Truck 454 cu. in. engines are designed with a
valve spring assembly height of 1.800”. This kit is designed specifically for those truck
applications. Engines designed with the taller assembly height of 1.880” should use Crane
Spring and Retainer Kit 13308-1.

- Recom’d installed spring pressure and height (valve closed)------114 lbs.@ 1.800”
- Open checking pressure and height ------287 lbs.@ 1.250”
- Maximum recommended valve lift and RPM ------.550” - 6500 RPM

excuse me for this question but by comparing the 221/221 cam to crane 10307 with 226/226 which one do you prefer?

Lunati 302A5LUN
Duration at 050 inch Lift: 221 int./221 exh.
Advertised Duration: 276 int./276 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.515 int./0.515 exh. lift
Lobe Separation (degrees): 110


Crane 10307
Duration at 050 inch Lift: 226 int./226 exh.
Advertised Duration: 282 int./282 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.533 int./0.533 exh. lift
Lobe Separation (degrees): 108


thanks again
I appreciate you help

Ahmed

pdq67
Apr 20th, 08, 7:32 PM
The smaller will make more grunt.

pdq67