Team Chevelle banner

454 Cam Choice for 4X4 truck

25K views 13 replies 3 participants last post by  pdq67 
#1 ·
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
 
See less See more
G
#2 ·
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

Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
 
#3 · (Edited)
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-10307
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-10306&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
 
#4 ·
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
 
#5 ·
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
 
G
#9 ·
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

Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
 
#13 · (Edited)
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
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top