power options- cam or head upgrade?

[bloxsidgemotorsport]

Hi Guys,

Just after some opinons on what would be bettter bang for buck.

Current engine is 350 chev, light weight bottom end, 520lift flat tappet cam, bowtie angle plug heads, around 13 to 1 compression. Runs in a carbied sprintcar downunder.

Would it be better to buy a new set of dart steel heads (we have to run steel heads)

or

Mechanical Roller Camshaft around the 620 lift.

What would be the best plan of attack for more power.

Regards

Jason

[DANNY]

Cant have one without the other, better breathing heads need a cam to accomidate them and a bigger cam needs the heads to be able to breath.

Might be able to get a better tuned cam cheaper then a "worked" set of heads though

[perfconn]

A roller cam at $350.00,a set of roller lifters at $350.00 and a good set of valve springs at $350.00 would probably still be cheaper than a set of ported Rhs raised runner steel heads and intake at $3500.00 but you probably need both to be a front runner.

[DaveBauerSS6]

Roller cam ... absolutely. That 520 cam is a toy, get the roller. Don't compromise on the valve spring, if the seats are not big enough, pull the heads and cut in larger. Verify valve to piston clearance. Is there any options on porting??

[bloxsidgemotorsport]

thanks guys, i have a mate selling the 620 lift cam, so will grab that of him as its only done 20 laps.

Yeah we can do anything we want to the heads, just not sure its worth spending dollars on a set of bowties.

[let-r-eat]

Port those Bowtie angle plugs up a little while you have it apart.

[DaveBauerSS6]

Agreed, then the heads can be corrected for the roller setup. Watch your rocker to retainer clearance.

[dynoman14]

To properly gauge what you need to do with the heads, you might want to list the essentials of both cams like .050" Duration, Lift and Lobe Separation.

One of the biggest gains you can make is putting ti valves in the heads if they are allowed, If not hollow steel. That will automatically give your valvetrain an extra 500-1000rpms over solid steel.

I would also put the fattest pushrod in the engine that will fit. Heavy on that side of the rocker arm will help dampen out harmonics and limit pushrod flex.

As you work thru the engine re-build do they allow shaft rockers or just stud mount. If you are on alcohol more compression sure would be sweet, angle mill them Bowties down to about 45-50ccs and let them eat. I would also cram as big an intake in them heads as you could afford and leave the exhaust 1.6 or 1.625.

From down under Yella Terra has some sweet stuff, I also have an imprort line of econo-shaft stuff that works on springs under 250# seat and 750# open.

If you can't find the stuff down there I have a ton of it on the shelf over here.

I ship to Aussie land a couple times a month, there and New Zealand.