What mild cam for stock 350 MAG??

[marcdups]

I am looking for a mild cam for my 350 mag!! I know a lot of you have done extreme performance mods to your engines and wonder if I will see any improvements with a mild cam and a performer intake or any other you may recommend, No $$$ for stainless manifolds yet, but dash upgrade hopefully coming soon.

[MOP]

I did a ton of asking about cams since I was a dry land racer and that was many years back. So I still don't know a hell of a lot but I do have an opinion, I would go for a decent stick to match the exhaust and intake. The Root will come up with some numbers that will work. I went with a 510 lift full roller setup which he feels is on the mild side.

Phil

[Rootsy]

what year is the boat and is this the original engine?

[marcdups]

Rootsy, Boat is a 1994 18' engine is stock, I believe ser # is above OF 12579, with weber 4 barrel, and sst riser, not certain about manifold but does not have a spec of corrosion on it, merc quick and quiet exhaust. I do believe it has roller lifters also.

[Cuda]

I had saved the cam information I used on the computer, now it's no longer there. I think I used the same cam as Forrest did on his SBC. It was a Crane. Forrest??

[Rootsy]

if all you want to do is a camshaft (kit) and an intake here are a few quick suggestions... these by no means are the ONLY options.. but you need to keep the lift under .480 - .500 AT THE MOST... with stock heads...

1. XM262H comp - flat tappet

2. compucam 2032 Crane - which is a hydraulic roller

3. and a PBM grind i cannot remember right now.. close to the 262 comp but different ramp accelerations and lift... - flat tappet

gotta do springs, retainers and locks when ya do these cams... they all use stock diameter (1.25 OD) springs.. single with a damper... 105 - 110 lb on the seat at like a 1.750 installed height...

cylinder heads are gonna be the bottle neck...

[Cuda]

As I recall, it had a .480 lift.

[marcdups]

Rootsy, what should be done to the heads, or do I need to change them??, I am not looking for much more than 300 ponies as I am running an alpha gen II and do not want to compromise it :wrench: :wrench:

[Rootsy]

if there isn't anything wrong with your cylinder heads then just leave em be... they'll be fine for what you are trying to do.

[rayjay]

Rootsy, what should be done to the heads, or do I need to change them??, I am not looking for much more than 300 ponies as I am running an alpha gen II and do not want to compromise it :wrench: :wrench:

Unless you have a lot of money to spare, leave them alone. If you want, or need to, have a good 5 angle valve job done with all the valves, especially the exhausts, given a 30 deg. back-cut just above the margin. If you have a few more bucks have the throats of all the intake and exhaust seats respectively machined to the same size and then blended into the bowls. With current technology and knowledge about heads, anything more would be a waste of money on stock heads.

What intake are you running and are you still using stock Mercruiser exhausts? I changed the risers on my old Eliminator ski boat from stock risers to taller 4" SS risers and picked up a fair amount of power throughout the rev range.

rayjay

[marcdups]

does this sound good, I sent the engine specs to crane and that is what they came up with, could not find the compucam2032???


Crane Camshaft Specification Card
Part Number: 119831
Grind Number: HR-284-2S-12 IG
Engine Ident: CHEVY 57-87 V8 262-400 ALSO 87-95 TRUCK
WITH CAST IRON DISTRIBUTOR DRIVE GEAR.
(ALSO 1987-95 NON-ROLLER TRUCKS)

VALVE SETTING: INTAKE .000 EXHAUST .000 ----> HOT

LIFT: INTAKE @CAM 339 @VALVE 509 ROCKER ARM RATIO
EXHAUST @CAM 352 @VALVE 528 1.50
ALL LIFTS ARE BASED ON ZERO LASH AND THEORETICAL ROCKER ARM RATIOS

CAM TIMING OPENS CLOSES ADV DURATION
@ .004 INTAKE 31.0 BTDC 73.0 ABDC 284.0 °
TAPPET LIFT EXHAUST 79.0 BBDC 33.0 ATDC 292.0 °

SPRING REQUIREMENTS
TRIPLE DUAL OUTER INNER
PART NUMBER 99838

LOADS:
CLOSED 110 LBS @ 1.688 OR 1 11/16
OPEN 330 LBS @ 1.188
RECOMMENDED RPM
RANGE WITH MATCHING COMPONENTS
MINIMUM RPM 2500
MAXIMUM RPM 6000
VALVE FLOAT 6500

CAM TIMING OPENS CLOSES MAX LIFT DURATION
@ .050 INTAKE 4.0 BTDC 38.0 ABDC 107 °ATDC 222.0 °
TAPPET LIFT EXHAUST 52.0 BBDC (2.0) BTDC 117 °BTDC 230.0 °

REMARKS:







Crane Cams continuously improves and upgrades its cam designs. In some cases this may mean that two Crane Cams with the same part number may actually be different grinds. You must check the GRIND NUMBER stamped on the front of the camshaft and check it against the Grind Number near the top of the Spec Card. For more information on the finest available camshafts, valve train components, and automotive ignition products, visit your local Crane dealer or call the Crane Cams tech line at (904) 258-6174 or FAX (904) 258-6167.

[BUIZILLA]

WAY toooo big... :smash:

oop's ,sorry, you didn't ask me :lookaroun

J

triple springs???

[marcdups]

poodle and zilla you know you can all chime in, I was just asking, darn it, Towel Boy :idea: :idea:
dual springs was what they told me!!