377 vortec

[rocketracer380]

4.155 bore 3.48 stroke 0 deck flattops 11.0:1 comp stock vortecs holley single plain and .230@ 50 .248@50 .510 in .525 ex with 1.6 im at .544 in .560 ex guides machined for added clearence 750 carb is 480hp too optimistic for combo forgot to mention 5.7 rods and 1/16 ring pack or am i better off with a 5.565 rod 406 with same cam and heads

[408 Nova]

4.155 bore 3.48 stroke 0 deck flattops 11.0:1 comp stock vortecs holley single plain and .230@ 50 .248@50 .510 in .525 ex with 1.6 im at .544 in .560 ex guides machined for added clearence 750 carb is 480hp too optimistic for combo forgot to mention 5.7 rods and 1/16 ring pack or am i better off with a 5.565 rod 406 with same cam and heads

I'd say hp would be closer 425-450 going by similar combos I've seen.

Plus, I'd would run the 5.7 rods if you can make them fit. If they are stock type 350 rods, the rod bolts are longer than the rod bolts in the stock type 400 rods, so that the threaded end will hit the flanks of the cam on rod throws 1&2 and 5&6. So you'll either have to run a reduced base circle cam, or get a set of rods with a shorter rod bolt in them, or both.

I always have plenty of clearance with the Scat Pro Series rods. Just be aware that if you get a longer rod, you'll have to get a different set of pistons to correct the compression height (CH).

[F-BIRD'88]

Id change the cam to a 248/248 on 106 lsa cam
or 248/251 106 cam (summit ct108)

[rocketracer380]

5.7 rod wont clear 3.48 stroke?

[rocketracer380]

the cam i posted is 107 lsa

[rocketracer380]

nice specs on that summit cam cheap too 89.99

[skinny z]

... stock vortecs

Isn't the output going to be limited by the airflow of the heads? That is to say at about 225 CFM (by various accounts), the output is likely to reach 450 CHP at most?

[rebelyell]

If you can swing it; 406".
400 crank, 6" rods, ~ 16cc - 22cc reverse dome pistons w/ about 1.125" comp distance (Mahle, Sealed Power, Wiseco/ProTru etc) and pay to have it all balanced.

[F-BIRD'88]

Stock vortecs (062) flow 228 cfm.

Better if you port them with 2.02 valves. 250+ cfm

[F-BIRD'88]

nice specs on that summit cam cheap too 89.99

These are made by Howards. There is a Howards # version and a Elgin # version.. same same.
If you can build as a 3.75 stroke 406 you are much better off. There are both -18cc and -21cc D dish pistons if you are building a pump gas 406 with 64cc heads.

[skinny z]

Stock vortecs (062) flow 228 cfm.

Better if you port them with 2.02 valves. 250+ cfm

Fair enough. So at 228 CFM, what's the most you can get?
Without some weird science thing that isn't available to mere mortals.
Seems to me, that 450 HP is about the limit regardless of the displacement.

[F-BIRD'88]

Stock vortecs (062) flow 228 cfm.

Better if you port them with 2.02 valves. 250+ cfm

Fair enough. So at 228 CFM, what's the most you can get?
Without some weird science thing that isn't available to mere mortals.
Seems to me, that 450 HP is about the limit regardless of the displacement.

Something like that, yes.. Thats why I suggested porting with 2.02's to hit the target power.

[skinny z]

Stock vortecs (062) flow 228 cfm.

Better if you port them with 2.02 valves. 250+ cfm

Fair enough. So at 228 CFM, what's the most you can get?
Without some weird science thing that isn't available to mere mortals.
Seems to me, that 450 HP is about the limit regardless of the displacement.

Something like that, yes.. Thats why I suggested porting with 2.02's to hit the target power.

I'm following along on this as I have a set of aftermarket Vortecs from RHS that have been pocket ported and flowed at 255 (2.02/1.6 w/~ 175 cc port, 65 cc chamber).
The decision is the CID that they'll sit on.

[F-BIRD'88]

Fair enough. So at 228 CFM, what's the most you can get?
Without some weird science thing that isn't available to mere mortals.
Seems to me, that 450 HP is about the limit regardless of the displacement.

Something like that, yes.. Thats why I suggested porting with 2.02's to hit the target power.

I'm following along on this as I have a set of aftermarket Vortecs from RHS that have been pocket ported and flowed at 255 (2.02/1.6 w/~ 175 cc port, 65 cc chamber).
The decision is the CID that they'll sit on.

Bigger is better.

[af2]

Something like that, yes.. Thats why I suggested porting with 2.02's to hit the target power.

I'm following along on this as I have a set of aftermarket Vortecs from RHS that have been pocket ported and flowed at 255 (2.02/1.6 w/~ 175 cc port, 65 cc chamber).
The decision is the CID that they'll sit on.

Bigger is better.

NO! How they hit the chamber is very important. Not being snotty just saying a well done Vortec will out perform a hogged out Masterpiece any day