I'm running a 383 with a set of afr 210 cc heads.I'm thinking of installing a solid roller cam.Without getting into a ton mumbo jumbo,how big is to big and how streetable is a solid cam check below for setup


383 12 or 13 to 1 compresion
afr210 heads
lt4 manifold
vig.3200 stall converter


This was a blower car that im going to n/a

give me some ideas thanks Mike

 

you can run ~248/258, .650/650 hyd roller and not have to deal with solid roller issues. How big are you wanting to go?

 

This was a blower car? with 12 or 13:1 compression?

Was the blower on the motor with a stock bottom end, and the 383 build up went to higher C/R and NA?

regardless it looks like you're squarely in race gas only territory. If you plan on pump gas you better have some decent overlap on the cam to bleed down the dynamic compression ratio (so the solid roller will help).

I've seen a few solid roller cams that were "streetable" but those were definitely pump gas engines with lower C/R's.

What are your goals for the car/engine? Just how "streetable" does it need to be? are we talking about stop/go traffic and 20 000 miles a year? or more like weekend crusier that get itself to the track without a trailer?

 

steve we are doing a piston swap on the blower i was at a compression ratio of 10.5 to 1 .I was running a big hydrulic roller but was pulling no vaccum . i wanted to make this car as streetable as possible so i've decided to sell the blower to finance the n/a motor ive seen a lot of cars in the 12 to 1 range on good pump gas(93-94 octaine) and make decent power and like you said i can bleed off alittle compresion with the over lap. By the way this car is still on the factory computer.

 

FWIW, it's not overlap that bleeds off compression when a "big" cam is installed. It's the later intake valve closing event. A SR can have a larger "area under the curve" at the same duration compared to a HR. The higher spring pressures that you can use allow the roller to follow a steeper ramp on the lobe. IOW, there is more lift/degree of duration. This has the potential of more flow with equal or better vacuum. The downside is the cost of the components and the greater wear due to higher spring pressures. And, of course, the need to adjust the valves.

Rich Krause