How much more power???

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Mar 2, 2008 | 12:04 AM

red L98

Thread Starter

Melting Slicks

Joined: Jul 2003

Posts: 2,284

Likes: 4

From: Canton MI

How much more power???

Sup guys,

Trying to get somewhat of an idea of the HP gains we should expect from this motor we built. it has my old short block which is a 434 CI sbc and one of my old cams. Lot of the part are off my old motor.

Specs:
434 CI
AFR 220
Super Vic intake “fully ported"
12.1 compressions
264-272@50 650-688 lift 110 lobe 4/7 swap
jessel belt drive

The head flow numbers are:

IN/Ex
.100 66-58
.200 147-112
.300 216-152
.400 262-190
.500 295-222
.600 298-248
.700 304-260

Now the motor has been 10.8s before we changed few things,

Things we changed:
Old cam: 252-252@50 630-630 lift 110 lobe
Old compression : 10.8
Belt drive
fully ported intake
more porting to the head mostly EX side with a total gain of 25 CFM EX
15 CFM intake.
No PS pump

and thats about it ,

thanks

Last edited by red L98; Mar 2, 2008 at 12:07 AM.

Mar 2, 2008 | 09:01 AM

bjankuski

Safety Car

Joined: Sep 2001

Posts: 4,154

Likes: 553

From: Glenbeulah Wi

My best estimate is the new engine should make 600HP to 625 HP, the old engine 550 HP to 575 HP.

Mar 2, 2008 | 12:20 PM

CORKVETTE1

Melting Slicks

Joined: Sep 2000

Posts: 3,099

Likes: 0

From: PITTSBURGH PA

Cruise-In IV Veteran

Cruise-In V Veteran

Quote:

Originally Posted by bjankuski

My best estimate is the new engine should make 600HP to 625 HP, the old engine 550 HP to 575 HP.

the head looks like they quit making good numbers by 500 lift they sort of flatten out by then the cam looks preety big i would have kept the same cam in first run it then change it to see if there is any improvement it could stay the same to 1-2 tenths max i think you did enough positives to out weigh the negatives but not by much

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