6 replies to this topic

[Muzza]

Hi All

thinking of heading down the road of Hydraulic roller cam in 253

Roller Cam Crow 51330

Roller cam followers 

 

I have checked valve lift and there is no binding at advertised lift so problems there (.550” max)

 

Do I need different pushrods?

Can i run std bridges?

 Has anybody run a roller cam in Holden 308 or 253 have a view

Thanks 

[yel327]

Talk to Crow. They'll know exactly what you nee. You'll probably need stronger springs though.

[Muzza]

Talk to Crow. They'll know exactly what you nee. You'll probably need stronger springs though.

 I will talk to Crow, stronger springs  not sure if i will need them it isn’t going to see more than 5000 ever, its a Hplate car not a burn out machine

[yel327]

Roller cans need different spring pressure. Tell they guys at Crow what you have and they’ll advise.

[LXCHEV]

When I converted my SBC to hydraulic roller, the engine builder used beehive valve springs. Much more modern design with lots of advantages - easier on components etc.

[rexy]

Its a lot more expensive than doing a flat tappet cam and probably no advantage in a mild street engine.

 

The best low cost performance improvement you could do is ditch the 253 and build a 308. 

[Muzza]

After reading crows instructions which differ from lunati , I will flat bottom again and follow crows instructions

( the big difference crow request you trail fit and check for rotation of every lifter before final assembly and running)

Its a lot more expensive than doing a flat tappet cam and probably no advantage in a mild street engine.

 

The best low cost performance improvement you could do is ditch the 253 and build a 308. 

 Was never chasing huge performance,