L98 build

[rocketracer380]

350 cid Stock iron 083 heads off l,98 with flattops and a compucam 2032 with 214in 222 ex 452" in 465" ex lift a performer intake with notched plenum divider and 3310 holley can it make 325hp.

[pdq67]

What is the proposed/actual CR number going to be?

pdq67

[rocketracer380]

about 10.5:1

[pdq67]

A stock '67 350SS L-48 engine at 10 or up to 10.25 CR is advertised at 295 hp with just the old 283, -929 hy-cam.

My Buddy, "Nuts", installed the good old -151 350hp/327 hy-cam in it and it woke right up.

Therefore imho, you should be at least at 320 or possibly 330hp!

pdq67

[cgarb]

Add 2 summit racing stickers and you could see north of 375hp...lol. In my opinion the heads stock without some work will prevent you from getting there. Add a set of vortec heads...no problem.

[mag2555]

The 083 heads do flow enough in stock form at .400" lift to make 45 hp per cylinder.

[rocketracer380]

i figure 325 should a reachable goal thanks for the input

[rfoll]

325 is just a number. The real question is whether or not it will perform up to your needs expectations.

[Orr89rocz]

I ran an efi version with a street tunnel ram type intake and stock L98 roller cam with 1.6 rockers. Rest of the bolt on stuff, headers, pulleys etc. it made 254 whp lean and would have been lower 260’s richened up. Estimate that to be 310 crank so you can get close i am sure

[novadude]

I would probably look to a single patter cam with a tighter (~108) lobe separation and duration around 220 @ 0.050 with those heads. Something like the isky 270 megacam would be perfect. I would expect this to build a lot more midrange torque than the cam you spec'd above.

[F-BIRD'88]

You can exceed the power expectations if you put some work into those cylinder heads. Of course that will involve more effort than asking people on the internet.
How much.....? Those 083 heads are the "camelback heads" of the 80's. Respond well to portingfor flow improvements.

[pdq67]

Fwiw, my pair of old 305HO, -601 heads have 1.84"/1.50" valves, hardened seats, 160 cc intake ports, 53 to 55 cc chambers that are double quench like the original, "fuelie", -461 heads. And I cc'd my chambers and one intake port, I forgot what the exhaust port cc'd, sorry... One head was 53 cc's and the other head, 55 cc's! Two end chambers.....

Imho, they are a dandy head if the CR doesn't get too high on a mild engine..

pdq67

[gnicholson]

another vote for the 270 isky mega cam

[pdq67]

another vote for the 270 isky mega cam

And even the old 264 Isky Mega hy-cam.

pdq67

[cv67]

x3 that compucam never impressed me at all. 300 on a good day