I have a 350" with 10.87 compression and smaller than 58 cc heads I have ran the 268H in it ground on a 106LSA which closed the intake valve sooner than the 260H cam.
225 psi cranking pressure. over 10 years on that engine and I pull my 20 foot pontoon with it.
35 total timing makes 3 less HP than 38 total.
Well I did recently change the cam to a 280H because I needed more top end power. seems these LS deals pull me on the big end.
You can't just willy nilly slap stuff together with high compression and make it work.
I remove all sharp edges on or in the chamber and on valve reliefs of the pistons and the outer edges of the piston tops.
My intake runners are not smooth.. they are roughed up starting from under the carb all the way to the first valve seat cut.
Rough like hard stone rough.
Keeps fuel atomized.
I have ran just under 12:1 with 91 octane gas and smallish cams like the 280h [email protected]
.050 on a 110 lsa.
They lived and they made excellent power.. but the attention to details.
Cars were not loaded up in gear and coolant temps stayed below 180 for the most part.
I recently did a 327 small journal ..right after pulling a 385".
Disappointing to say the least . I left it in for 2 days and pulled it and stuck a 357" in.
I was only around 9.5 compression on the 327.. not enough I ran the 230-230 cam the 280H.
your heads flow much better than mine and more compression also.
Should work well.
I ported my cousing 461 heads on his 327" and stuck the RPM intake on it with an old crower cam on a 108LSA .
It had a 4 speed and 336 gears in a 67 camaro.. went 13.8 et. 20+ years ago
I run 13.5 et easy with a 350" and 268H today with ported 601 iron heads. Better MPG quieter and much more TQ out of the hole.
I do not think another small cube would make me happy.
But if you are light like 3000 lb race weight it might be good.
My vehicle was 3376 with driver and it was ho hum below 4500 rpm.