What will it make?
 

Building a new engine for our 69GP. Just curious what people think it'll make.
Its a 11:1 463ci with a 242-247 HR cam .640 lift, kre d-port heads flowing 320+in 230+ex (2.11x1.77 valves), topped off with a RPM intake and 950Holley and1 3/4 headers.

625

Any work to the RPM intake?

Port matched and blended for the square bore carb.

I will add there is nothing special/trick done in the short block

600plus..I like the compression ratio. Any more details on the head/cam combination?

575hp. Would be my guess.

605 / 635T

635 hp
Tom V.

600 hp 600 t

Charles

don’t wanna pee in your wheaties but thought i heard the rpm might have a lean cylinder or two in applications pushing that kind of power. maybe try a T2? or at least do a forum search to see if you find any info on that issue.

I'll play...I say 622

Not worried about it. But we will be testing a couple intakes including a tri-power.

I sure hope some of you guy are right but i think there are a lot of optimistic guesses here.

Like?

Hmmmm…… Nice donuts

ok cool. if you decide to post the results i will definitely look forward to seeing them.

A related combination for interest....

SD Performance KRE D-port 300-305 cfm CNC ported heads.
10.5:1 compression ratio
Comp part # 51-000-11
Grind # P8 3115B / 3116B HR112.0
.006" - 306 / 314
.050" - 246 / 252
0.4000" lobe lift intake & exhaust / 1.52 rocker ratio
112 LSA
Crower solid roller lifters w/ .005" lash
Minimum 150 lbs seat pressure after run in

.030-over 455 / 4.250" stroke
Torker II intake port matched to the heads w/1-inch open carb spacer
Holley HP950 carb
1.75 headers

588.5 HP at 5800 rpm
600.6 ft.lbs. torque at 4600/4700 rpm


.

Yes..great compression for those heads ..should have no issues with pump gas.

Looking forward to results.
Thanks for sharing.

My 455 with 290 heads and 10.25 CR with stock type dual plane intake and a 750 carb made 550 with a touch more cam.I figure the Xtra CI,better heads,more CR,better intake and bigger carb should get him above the 600.Tom

I am curious whether you are considering beehive springs and lightweight retainers? have read some about getting more high rpm power that way.