zrc3john

I recently put up a few posts about a stroker build I'm thinking of doing..I have the short block, fully forged , eagle crank and custom grind cam...

I'm thinking of just using my 190 cc pro comps off my 350 block....

Can somebody explain runner size to me and which is the best for a "street motor"..??? I see runner sizes in 170 cc ,180 cc ,190 cc , 200 cc etc.etc.

Street motor meaning great throttle response and useable torque between 2,000-4,000 RPM...

I hear the bigger the runner size, the more power in the upper RPM range than down low....

If I do the swap ,I'm just looking for a balance between both..

Thanks for all the previous responses....

REELAV8R

What is you altitude? Rear Gear?

Cams should be ground to match the head and compression, not visa versa. So decide head first then cam.

Pro comps don't flow the best in the midlift range. The exhaust port flows poorly as well, compared to some others.

190's look like this:

INT EX
.1-71 55
.2-127 104
.3-178 132
.4-222 165
.5-253 180
.6-279 181
.7-287 182

AFR 195's look like this:

195cc Street Head Flow Chart
.200 .300 .400 .500 .550
Int 146 201 247 275 280
Exh 119 166 197 213 218

What RPM limit are you looking at?

Generally speaking if it were mine I would lean towards 200cc vs 190cc at sea level, but it depends on the head and the goals.

zrc3john

I'm at sea level...4 speed with a 3:70 gear..Thinking of going to 3:36.....3:70s are tough on highway in long cruises....

Cam came with short block....Will get in touch with shop I bought block from and get the specs of the cam....This way I'll know if my present heads will be suffice.....I know there's more expensive heads out there but I was looking more toward a budget build, maybe..

​​​​​​​Shift point? 5,000 5,500 is good enough...I won't be racing it basically......If I can get to the track and run it a few times in good weather, than fine..

7t9l82

The 190 pro comps can't compare with ported afr heads but, you have the heads already and lots of guys race with those same heads. I'd find a local shop and have them gone through and even some port and bowl work done. All for less than afr heads.dont fall into the you have to get the most expensive stuff trap
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Kacyc3

Isn't 170 is usually best for a stock 350, 180 for performance 350 or great low end 383 like a truck, 190 for good low end-mid range 383, 200 for upper rpm 383, as in minimum suggestions?

REELAV8R

I think the pro comps you have will serve the purpose you have outlined well enough.
Just get a cam that will serve the flow on those heads and the compression you plan on using to maximize the performance.

Roller cam doesn't fit the budget build, but with the state of flat tappet issues that I've read about, it may be better than the risk of getting a flat lobe.

GOSFAST

We've done "tons" of builds on the 383" platform with 190 or less runners. Done correctly you'll still be in the 480/500 HP range!

Generally speaking, smaller runners will yield more available Torque at lower driving speeds.

Thanks, Gary in N.Y.

P.S. On a side note we do very few "flat-tappet" builds any longer. It pays to go roller and take advantage of some "free" 30 Hp by design. For us it's much easier also now due to no more cam buttons or end play issues to contend with! It's all done with a thrust-plate retainer setup now.

worship79

I run EDL-60909 heads (64cc, 185cc intake runners) with the 2701 EPS intake and a CompCams XE274H cam on my 383. 1.52 roller tip rockers. Just a tad under 450 hp at the flywheel.

Gary: entertain me on this new roller setup? I'm contemplating a top end upgrade for the future.